Hermann Format Slim HE 25 T - Water heaters SIME - Free user manual and instructions

Product Type	Condensing wall-mounted boiler for heating and domestic hot water (with storage tank)
Model	Hermann Format Slim HE 25 T
Dimensions (W x D x H)	400 x 250 x 700 mm
Weight	27.5 kg
Power Supply	230 V ~ 50 Hz, 105 W
Fuel	G20 (methane) or G31 (propane) – no mechanical conversion required
Nominal Heat Input	24.0 kW
Nominal Heat Output (80-60°C)	23.6 kW
Nominal Heat Output (50-30°C)	25.7 kW
Efficiency (50-30°C at max.)	107.1%
Efficiency (30% load, 40-30°C)	107.0%
NOx Class	5 (< 70 mg/kWh)
Max Operating Pressure	3 bar
Water Capacity	4.5 L
Expansion Vessel Capacity	9.0 L (pre-charge 1.0 bar)
Heating Adjustment Range	20–80°C
DHW Adjustment Range	10–60°C
Safety Devices	Safety thermostat (100°C), 3 bar relief valve, pressure transducer, flame detection, anti-freeze function
Additional Functions	Chimney sweep function, anti-blocking pump/diverter valve, self-calibration, external sensor support
Maintenance	Annual maintenance required; cleaning of burner and combustion chamber with soft brush; check electrodes and seals
Flue Options	Coaxial 60/100 mm or 80/125 mm; separate ducts Ø60 mm or Ø80 mm; type B23P, C13, C33, C43, C53, C63, C83

Frequently Asked Questions - Hermann Format Slim HE 25 T SIME

How do I switch the boiler between summer and winter mode?

Press and hold the OR button for at least 1 second to cycle through Stand-by, Summer, and Winter modes. The display will show the appropriate symbol.

What should I do if the display shows an alarm code like ALL 06?

Code ALL 06 indicates no flame detection. First, check that the gas valve is open and the gas supply is available. Then press and hold the OR button for 3 seconds to reset. If the fault persists, contact a qualified technician.

Can I use this boiler with propane (LPG) without modification?

Yes, the Format Slim HE 25 T can operate on G20 (methane) or G31 (propane) without mechanical conversion. Simply set parameter PAR 03 to 0 for methane or 1 for LPG via the control panel.

How often should the boiler be serviced?

Annual maintenance by a qualified professional is recommended to ensure efficient and safe operation. This includes cleaning the burner, checking electrodes, and verifying flue integrity.

What is the correct system pressure when cold?

The heating system pressure should be between 1.0 and 1.2 bar when cold. If it is lower, use the filling valve to restore pressure. Check the display for the current pressure reading.

How do I activate the chimney sweep function?

With the boiler in Summer mode, press and hold the - and + buttons simultaneously for about 5 seconds until 'Hi' appears. Then use + for max power or - for min power. The function lasts 15 minutes. Exit by pressing the OR button.

What flue options are available for this boiler?

The boiler supports coaxial ducts (60/100 mm or 80/125 mm) and separate ducts (Ø60 mm or Ø80 mm). Approved types include C13, C33, C43, C53, C63, C83, B23P, and B53P. Always use Hermann-approved accessories.

How do I adjust the heating or domestic hot water temperature?

Press the heating button (radiator symbol) or DHW button (tap symbol), then use + or - to set the desired temperature. Heating range: 20–80°C; DHW range: 10–60°C.

What does the external sensor do?

If an external temperature sensor (optional) is connected, the boiler automatically adjusts the water temperature based on outdoor conditions using a climatic curve. This improves comfort and energy efficiency.

What should I do if the boiler freezes?

The boiler has an anti-freeze function that activates if internal water temperature drops below a set threshold (parameter PAR 10, default 3°C). For long absences, leave the boiler in Stand-by mode with power and gas on to enable this protection.

USER MANUAL Hermann Format Slim HE 25 T SIME

Condensing wall mounted boiler

FORMAT SLIM HE 25 T

INSTALLATION AND MAINTENANCE MANUAL

Front view line drawing of a rectangular electronic device with a central control panel and mounting tabs (no text or symbols)

EN

RANGE

MODEL CODE
Format Slim HE 25 T - (G20) 8112560

COMPLIANCE

Format Slim HE 25 T boilers comply with:

– Gas Appliances Directive 2009/142/EC
- Boiler Efficiency Directive 92/42/EEC
- Low Voltage Directive 2006/95/EC
- Electromagnetic Compatibility Directive 2004/108/EC
- Thermal Efficiency ★★★★
- Classified as "Condensing"
- Class NOx 5 (< 70 mg/kWh)

Please refer to the technical data plate for the serial number and year of manufacture.

EC DECLARATION OF CONFORMITY

In accordance with "Gas Appliances" Directive 2009/142/EC, "Electromagnetic Compatibility" Directive 2004/108/EC, "Boiler Efficiency" Directive 92/42/EC and "Low Voltage" Directive 2006/95/EC, the manufacturer HERMANN, DECLARES THAT the boiler models Format Slim HE 25 T comply with the European Directives.

SYMBOLS

DANGER

To indicate actions which, if not carried out correctly, can result in injury of a general nature or may damage or cause the appliance to malfunction; these actions therefore require particular caution and adequate preparation.

DANGER

To indicate actions which, if not carried out correctly, could lead to injury of an electrical nature; these actions therefore require particular caution and adequate preparation.

IT IS FORBIDDEN

To indicate actions which MUST NOT BE carried out.

CAUTION

To indicate particularly important and useful information.

TABLE OF CONTENTS

1 DESCRIPTION OF THE APPLIANCE 5

1.1 Characteristics
1.2 Check and safety devices
1.3 Identification
1.4 Structure
1.5 Technical features
1.6 Main water circuit
1.7 Sensors
1.8 Expansion vessel
1.9 Circulation pump
1.10 Control panel
1.11 Wiring diagram

2 INSTALLATION 12

2.1 Receiving the product
2.2 Dimensions and weight
2.3 Handling
2.4 Installation room
2.5 New installation or installation of a replacement appliance
2.6 Cleaning the system
2.7 Water system treatment
2.8 Boiler installation
2.9 Plumbing connections

2.9.1 Plumbing accessories (optional)

2.10 Condensate outlet/collection
2.11 Gas supply
2.12 Smoke outlet and combustion air inlet

2.12.1 Coaxial duct

2.12.2 Separate ducts (Ø 60mm and Ø 80mm)

2.13 Electrical connections

2.13.1 External sensor
2.13.2 Chrono-thermostat or Air Thermostat
2.13.3 EXAMPLE of use of the command/control device on some types of heating systems

2.14 Refilling or emptying

2.14.1 REFILL operations
2.14.2 EMPTYING operations

3 COMMISSIONING 21

3.1 Preliminary operations
3.2 Before commissioning

3.2.1 Self-calibrating procedure

3.3 Parameter setting and display
3.4 List of parameters
3.5 Fault / malfunction codes
3.6 Display of operating data and counters
3.7 Checks

3.7.1 Chimney sweep function

3.8 Gas conversion

4 MAINTENANCE 27

4.1 Adjustments
4.2 External cleaning

4.2.1 Cleaning the cladding

4.3 Cleaning the inside of the appliance

4.3.1 Removing components
4.3.2 Cleaning the burner and the combustion chamber
4.3.3 Final operations

4.4 Checks

4.4.1 Checking the smoke duct
4.4.2 Checking the expansion vessel pressure

4.5 Unscheduled maintenance
4.6 Possible faults and solutions

SAFETY WARNINGS AND REGULATIONS

WARNINGS

• After having removed the packaging make sure that the product supplied is integral and complete in all its parts. If this is not the case, please contact the Dealer who sold the appliance.
• The appliance must be used as intended by HERMANN who is not responsible for any damage caused to persons, animals or things, improper installation, adjustment, maintenance and improper use of the appliance.
• In the event of water leaks, disconnect the appliance from the mains power supply, close the water mains and promptly inform professionally qualified personnel.
• Periodically check that the operating pressure of the water heating system when cold is 1-1.2 bar. If this is not the case, increase the pressure or contact professionally qualified personnel.
• If the appliance is not used for a long period of time, at least one of the following operations must be carried out:

- set the main system switch to "OFF";

- close the gas and water valves for the water heating system.

- In order to ensure optimal appliance operations HERMANN recommends that maintenance and checks are carried out ONCE A YEAR.

RESTRICTIONS

IT IS FORBIDDEN

• The appliance is not to be used by children or unassisted disabled persons.

• Do not use electrical devices or appliances such as switches, electrical appliances etc if you can smell fuel. If this should happen:

• open the doors and windows to air the room;

• close the gas isolation device;
• promptly call for professional assistance.

- Do not touch the appliance with bare feet or with any wet part of the body.

• Do not carry out any technical intervention or cleaning operation before having disconnected the appliance from the mains power by setting the main switch to "OFF", and closing the gas supply.
• Do not modify the safety or adjustment devices without authorization and instructions from the manufacturer.
• Do not block the condensate drain (if present).
• Do not pull, detach or twist the electrical cables coming out of the appliance even if the appliance is disconnected from the mains power supply.
• Do not expose the boiler to atmospheric agents. This boiler has not been designed to work on the outside of a building.
• Do not block or reduce the size of the ventilation openings of the room where the appliance is installed, if present.
• Remove the mains power and gas supply from the appliance if the external temperature could fall below ZERO (risk of freezing).
• Do not leave containers with flammable substances in the room where the appliance is installed.
• Do not leave packaging material around since it could be dangerous. Therefore dispose of it as prescribed by legislation in force.

WARNINGS

• It is recommended that all operators read this manual carefully in order to use the appliance in a safe and rational manner.
• This manual is an integral part of the appliance. It must therefore be kept for future reference and must always accompany the appliance in the event the appliance is transferred or sold to another Owner or User or is installed on another system.
• Installation and maintenance of this appliance must be carried out by a qualified company or by a professionally qualified technician in accordance with the instructions contained in the manual. The company or technician will, at the end of installation operations, issue a statement of compliance with national and local Technical Standards and Legislation in force

1 DESCRIPTION OF THE APPLIANCE

1.1 Characteristics

Format Slim HE 25 T are last generation condensing wall mounted boilers which HERMANN has produced for heating and domestic hot water production when combined with a storage tank. The main design choices made by HERMANN for the Format Slim HE 25 T boilers are:

• the total pre-mix microflame burner combined with a steel heat exchanger for heating
• the sealed combustion chamber which can be classified "Type C" or "Type B" in relation to the room where the boiler is installed, depending on the smoke outlet configuration adopted during installation
• the command and control microprocessor electronic board not only allows a better management of the heating system and the system for domestic hot water production but it can also be connected to a remote control with an Open Thermo protocol or to air thermostats or to an external sensor. If connected to an external sensor, the boiler temperature varies on the basis of the external temperature according to a selected optimal climatic curve providing significant energy and economic savings.
  Other special features of the Format Slim HE 25 T boilers are:
• the anti-freeze function which activates automatically if the temperature of the water inside the boiler falls below the threshold of the value set at parameter "PAR 10" and, if there is an external sensor, if the external temperature falls below the threshold of the value set at parameter "PAR 11".
• the anti-blocking function of the pump and diverter valve. This activates automatically every 24 hours if no request for heat has been made
• the chimney sweep function lasts 15 minutes and makes the job of the qualified technician easier when measuring the parameters and combustion efficiency
• screen display of the operating and self-diagnostic parameters with error code display when the fault occurs. This makes repair interventions easier and allows appliance operation to be restored correctly.

1.2 Check and safety devices

The Format Slim HE 25 T boilers are equipped with the following check and safety devices:

• thermal safety thermostat 100°C
• 3 bar relief valve
• heating water pressure transducer
• delivery sensor
• hot water tank sensor
• smoke probe.

IT IS FORBIDDEN

to commission the appliance with safety devices which do not work or which have been tampered with.

DANGER

Safety device may only be replaced by professional qualified personnel using HERMANN original spare parts.

1.3 Identification

The Format Slim HE 25 T boilers can be identified by means of:

1 Packaging label: this is located on the outside of the packaging and provides a code, the serial number of the boiler and the bar code
2 Technical Data Plate: this is located inside the front panel of the boiler and provides the technical specification, appliance performance and any other information required by law.

1

Isometric line drawing of a rectangular box with internal components and labeled point '1' (no text or symbols beyond basic labels)

2

Technical line drawing of a rectangular industrial machine casing with labeled components (no text or symbols present)

Fig. 1

KEY:

1 Packaging label
2 Technical Data Plate

CAUTION

Tampering with, removing or failing to display the identification plate or carrying out any other operation which does not allow safe identification of the product or which may hinder installation and maintenance operations.

1.4 Structure

1 Heat exchanger bleed point
2 Heat exchanger
3 Combustion chamber door
4 Oversleeve
5 Flame viewing window
6 Ignition/detection electrode
7 Heat safety thermostat
8 Delivery sensor
9 Ventilator
10 Condensate siphon
11 Diverter valve
12 System filling unit
13 Control panel
14 Gas valve

15 System relief valve
16 Boiler drain
17 System pump
18 Water pressure transducer
19 Automatic bleed valve
20 Air-gas mixer
21 Expansion vessel
22 Air inlet pipe
23 Air-smoke chamber
24 Smoke probe
25 Air inlet
26 Smoke outlet

Fig. 2

1.5 Technical features

DESCRIPTION		Format Slim HE 25 T
CERTIFICATIONS
Country of intended installation IT - ES - PT - GR - SI
Fuel G20 - G31
PIN number (CE) 1312CP5936
Category II2H3P
Type B23P - B53P - C13 - C33 - C43 - C53 - C63 - C83
Class NOx 5 (< 70 mg/kWh)
HEATING PERFORMANCE
HEAT INPUT
Nominal kW 24,0
Minimum kW 3,0
HEAT OUTPUT
Nominal (80-60°C) kW 23,6
Nominal (50-30°C) kW 25,7
Minimum G20 (80-60°C) kW 2,9
Minimum G20 (50-30°C) kW 3,2
Minimum G31 (80-60°C) kW 2,9
Minimum G31 (50-30°C) kW 3,2
EFFICIENCY
Max useful efficiency (80-60°C)	%	98,3
Min useful efficiency (80-60°C)	%	96,6
Max useful efficiency (50-30°C)	%	107,1
Min useful efficiency (50-30°C)	%	106,6
Useful efficiency at 30% of load (40-30°C)	%	107,0
Thermal efficiency (EEC 92/42)		★★★★★
Losses after shutdown at 50°C	W	84
ELECTRICAL SPECIFICATIONS
Power supply voltage	V	230
Frequency	Hz	50
Absorbed electrical power	W	105
Electrical protection degree	IP	X5D
COMBUSTION DATA
Smoke temperature at Max/Min flow (80-60°C)	°C	82 / 65
Smoke temperature at Max/Min flow (50-30°C)	°C	59 / 45
Maximum smoke flow Min/Max	g/s	11,1 / 1,38
CO2 at Max/Min flow rate (G20)	%	9,0 / 9,0
CO2 at Max/Min flow rate (G31)	%	10,0 /10,0
NOZZLES - GAS
Number of nozzles	No.	1
Nozzle diameter (G20-G31)	mm	5,3
Gas consumption at Max/Min flow rate (G20)	m3/h	2,53 / 0,32
Gas consumption at Max/Min flow rate (G31)	Kg/h	1,86 / 0,23
Gas supply pressure (G20/G31)	mbar	20 / 37
	kpa	2 / 3,7
TEMPERATURE - PRESSURE
Max operating temperature	°C	85
Heating adjustment range °C	20÷80
Domestic hot water adjustment range	°C	10÷60
Max operating pressure	bar	3
	kpa	300
Water content in boiler	L	4,50

Lower Heat Output (Hi)
G20 Hi. 9.45 kW/m³ (15°C, 1013 mbar) - G31 Hi. 12.87 kW/kg (15°C, 1013 mbar)

NB: if the appliance is to operate in combination with a storage tank, the Heat Input remains unchanged in relation to the HEATING PERFORMANCE.

1.6 Main water circuit

KEY:

M System delivery
R System return
Mb Hot water tank delivery
Rb Hot water tank return
S Safety valve outlet
G Gas supply
U Domestic hot water outlet
E Domesti hot water inlet
Sc Condensate outlet
1 Condensing heat exchanger
2 Combustion chamber
3 Ventilator
4 Thermal safety thermostat
5 Delivery sensor
6 Pressure transducer
7 Automatic bleed valve
8 Pump
9 System expansion vessel
10 Diverter valve
11 Automatic by-pass
12 Gas valve
13 Boiler drain
14 System relief valve
15 Condensate siphon outlet
16 Storage tank
17 Magnesium anode
18 Domestic hot water sensor
19 Hot water tank drain valve
20 Domestic hot water expansion vessel
21 Hot water tank relief valve
22 Domestic hot water inlet valve

1.7 Sensors

The sensors installed have the following characteristics:

• Dual sensor (thermal safety/output) NTC R25°C; 10kΩ B25°-85°C: 3435
• domestic hot water sensor NTC R25°C; 10kΩ B25°-85°C: 3435
• external sensor NTC R25°C; 10kΩ B25°-85°C: 3435

Correspondence of Temperature Detected/Resistance

Examples of reading:

TR = 75^ R = 1925;

TR = 80^ R = 1669.

TR	0°C	1°C	2°C	3°C	4°C	5°C	6°C	7°C	8°C	9°C
0°C	27279	26135	25044	24004	23014	22069	21168	20309	19489	18706	Resistenza R (Ω)
10°C	17959	17245	16563	15912	15289	14694	14126	13582	13062	12565
20°C	12090	11634	11199	10781	10382	9999	9633	9281	8945	8622
30°C	8313	8016	7731	7458	7196	6944	6702	6470	6247	6033
40°C	5828	5630	5440	5258	5082	4913	4751	4595	4444	4300
50°C	4161	4026	3897	3773	3653	3538	3426	3319	3216	3116
60°C	3021	2928	2839	2753	2669	2589	2512	2437	2365	2296
70°C	2229	2164	2101	2040	1982	1925	1870	1817	1766	1717
80°C	1669	1622	1577	1534	1491	1451	1411	1373	1336	1300
90°C	1266	1232	1199	1168	1137	1108	1079	1051	1024	998
100°C	973

1.8 Expansion vessel

The expansion vessel installed on the boilers has the following characteristics:

Description U/M Format		Slim HE 25 T
Total capacity l 9,0
Prefilling pressure	kPa 100
	bar 1,0
Useful capacity	l 5,0
Maximum system content (*)	l	124

(*) Conditions of:

Average maximum temperature of the system 85°C

Start temperature at system filling 10°C.

CAUTION

• For systems with water content exceeding the maximum system content (as indicated in the table) an additional expansion vessel must be prearranged.
• The difference in height between the relief valve and the highest point of the system cannot exceed 6 metres. If the difference is greater than 6 metres, increase the prefilling pressure of the expansion vessel and the system when cold by 0.1 bar for each meter increase.

1.9 Circulation pump

The flow-head performance curve available for the heating system is shown in the graph below.

The flow-head performance curve available for the remote hot water tank coil is shown in the graph below.

CAUTION

The appliance is equipped with a by-pass which ensures water circulation in the boiler when the thermostatic valves or cocks are used in the system.

1.10 Control panel

1 FUNCTIONAL BUTTONS

OR If pressed once or more than once for at least 1 second during normal operation, this button allows the user to change the boiler operating mode in a cyclical sequence (Stand-by - Summer - Winter). If the boiler is experiencing a fault which can be reset, it allows boiler operation to be unblocked.

During normal operation, pressing the button displays the domestic hot water set point which can be between 10 and 60°C. In "parameter setting", the user can scroll through the parameter index (decreasing) by pressing this button.

During normal operation, pressing the button displays the heating set point which can be between 20 and 80°C. In "parameter setting", the user can scroll through the parameter index (increasing) by pressing this button.

During normal operation, pressing this button allows the user to reduce the heating or DHW set point on the basis of the selection made previously. If there is a Remote Control (Open Therm), after having selected the heating button, the user can modify the incline of the climatic curve (decreasing it) by pressing the button (-). In "parameter setting/display", the user can modify the parameter setting or value (decreasing) by pressing this button.

+ During normal operation, pressing this button allows the user to increase the heating or DHW set point on the basis of the selection made previously. If there is a Remote Control (Open Therm), after having selected the heating button, the user can modify the incline of the climatic curve (increasing it) by pressing the button (+). In "parameter setting/display", the user can modify the parameter setting or value (increasing) by pressing this button.

Programming connector cover plug.

Nb: pressing any one of these buttons for more than 30 seconds generates a fault on the display without preventing boiler operation. The warning disappears when normal conditions are restored.

1 DiSpLay

“SUMMER”. This symbol appears when the boiler is operating in "Summer" mode or if only the domestic hot water mode is enabled via the remote control. If the symbols 🙏 and 🚫 are flashing, this indicates that the chimney sweep function is active.

"wiINTER". This symbol appears when the boiler is operating in "Winter" mode or if both the domestic hot water and heating modes are enabled via the remote control. With the remote control, if no operating modes have been enabled both symbols 🙏 and 🚫 will be off.

"RESET REQUIRED". The message indicates that after having repaired the fault, normal boiler operation can be restored by pressing the button OR.

“DOMESTiC HOT waTER”. This symbol is present during a DHW request or during the “chimney sweep function” It flashes during the selection of the domestic hot water set point.

"HEaTiNg". This symbol lights up during heating operation or during the "chimney sweep function It flashes during the selection of the heating set point.

"bLOCK" DUE TO NO FLaME.

"FLaME pRESENCE".

"p0wER LEVEL". This indicates the power level at which the boiler is operating.

"paRaMETER". This indicates that the user may be in parameter setting/display, or "info" or "counter", or in "activated alarms" (history).

"aLaRM". This indicates that a fault has occurred. The number specifies the cause which generated the alarm.

"CHiMNEy SwEEp". This indicates that the "chimney sweep function" has been activated.

"EXTERNAL SENSOR". This indicates that the external sensor has been installed and that the boiler is working on a sliding temperature.

1.11 Wiring diagram

TRA Ignition transformer

PI System pump

V Ventilator

EAR Ignition / Detection electrode

EV Gas solenoid valve

SM Delivery sensor

SB Hot water tank sensor

TS Safety thermostat

TFU Thermal fuse

SF Smoke probe

VD Diverter valve

TPA Pressure transducer

TA-TA2 Air thermostat

SE External sensor

CR Remote control (instead of air thermostat)

To connect the "Air Thermostat" or, alternatively the "Remote Control", remove the bridge between terminals 5-6.

Fig. 7

CAUTION

Users must:

• Use an omnipolar cut-off switch, disconnect switch in compliance with EN Standards
• Respect the connections L (Live) - N (Neutral)
• Ensure that the special power cable is only replaced with a cable ordered as a spare part and connected by professionally qualified personnel
• Connect the earth wire to an effective earthing system. The manufacturer is not responsible for any damage caused by failure to earth the appliance or failure to observe the information provided in the wiring diagrams.

IT IS FORBIDDEN

To use water pipes for earthing the appliance.

2 INSTALLATION

2.1 Receiving the product

Format Slim HE 25 T appliances are delivered in a single unit protected by cardboard packaging.

Isometric illustration of a cardboard box with internal compartments and directional arrows (no text or symbols)

The plastic bag found inside the packaging contains the following:

• Installation, use and maintenance manual
  – Paper template for boiler installation
• Certificate of warranty
• Hydrostatic test certificate
• System booklet
• Bag with expansion plugs

IT IS FORBIDDEN

Do not leave packaging material around or near children since it could be dangerous. Dispose of it as prescribed by legislation in force.

2.2 Dimensions and weight

Description	Format Slim HE 25 T
W (mm) 400
D (mm) 250
H (mm) 700
Weight (kg) 27,5

2.3 Handling

Once the packaging has been removed, the appliance is to be handled manually, tilting it slightly, lifting it and applying pressure in the points indicated in the figure.

Illustration of hands holding a rectangular device with a circular component, showing motion arrows (no text or symbols)

IT IS FORBIDDEN

DO NOT hold onto the appliance cladding but use the "solid" parts such as the base and the rear structure.

DANGER

Use suitable tools and accident protection when removing the packaging and when handling the appliance.

2.4 Installation room

The room where the appliance is to be installed must comply with the Technical Regulations and Legislation in force. It must be equipped with suitably sized ventilation openings when the installation is a "TYPE B" installation.

The minimum temperature of the installation room must NOT be lower than -5 °C.

CAUTION

Remember to consider the space needed in order to access the safety/adjustment devices and to carry out maintenance interventions(see the figure below).

APPROXIMATE MINIMUM DISTANCES

Fig. 11

2.5 New installation or installation of a replacement appliance

When Format Slim HE 25 T boilers are installed on old systems or systems requiring updating, it is recommended the installer checks that:

• the connecting flue pipe is suitable for the combustion temperature of the appliance, calculated and manufactured in compliance with Standards, that it is as straight as possible, air tight, isolated, with no obstructions or restriction and that it has appropriate condensate collection and evacuation systems
• the electrical system has been manufactured in compliance with specific Standards and by professionally qualified personnel
• the fuel delivery line and the tank (LPG) comply fully with specific Standards
• the expansion vessel ensures total absorption of the fluid dilation in the system
• the pump flow-head performance is sufficient for the system characteristics
• the system is clean, free of any sludge, deposits, de aerated and air tight. For system cleaning, please refer to the relevant paragraph.

CAUTION

The manufacturer declines all liability for any damage caused by an incorrect implementation of the smoke outlet.

2.6 Cleaning the system

Before installing the appliance on a newly constructed system or replacing a heat generator on an existing system, it is important that the system is thoroughly cleaned to remove sludge, slag, dirt, residue etc.

Before removing an old heat generator from an existing system, it is recommended that the user:

• puts a descaling additive into the water system
• allows the system to work with the generator active for a few days
• drains the dirty water from the system and flushes the system with clean water once or more than once.

If the old generator has already been removed or is not available, replace it with a pump to circulate water in the system and then proceed as described above.

Once cleaning operations have been carried out and before installing the new appliance, it is recommended that a fluid is added to the water system to protect it from corrosion and deposits.

CAUTION

For further information on the type of additive and usage, please contact the appliance manufacturer.

2.7 Water system treatment

When filling and restoring the system it is good practice to use water with:

- aspect: clear if possible

- pH: 6-8

- hardness: < 25°f.

If the water characteristics are different from those indicated, it is recommended that a safety filter is used on the water delivery pipe to retain impurities, and a chemical treatment system to protect against possible deposits and corrosion which could affect boiler operation.

If the systems are only low temperature systems, it is recommended that a product is used to prevent the development of bacteria.

In any case, please refer to and comply with Legislation and specific Technical Standards in force.

2.8 Boiler installation

Format Slim HE 25 T boilers leave the factory with a paper template for installation onto a solid wall.

For installation:

• position the paper template (1) on the wall (2) where the boiler is to be mounted
• make the holes and insert the expansion plugs (3)
• hook the boiler onto the plugs.

- The height of the boiler is to be such that disassembly and maintenance interventions are facilitated.

2.9 Plumbing connections

The plumbing connections have the following characteristics and dimensions.

Fig. 13

Description	Format Slim HE 25 T
M - System delivery ∅ 3/4" G
R - System return ∅ 3/4" G
Mb - Hot water tank delivery ∅ 3/4" G
Rb - Hot water tank return ∅ 3/4" G
G - Gas supply ∅ 3/4" G
Sc - Condensate outlet ∅ 20 mm

2.9.1 Plumbing accessories (optional)

To facilitate plumbing and gas connections to the systems, the accessories as shown in the table below are available and are to be ordered separately from the boiler.

DESCRIPTION CODE
Installation plate 8075441
Cocks kit 8091820
Wall mount replacement kit for other makers 8093900
Fitting protection Kit	8094530
Polyphosphate dosing kit	8101700
Dosing recharge kit	8101710

NB: kit instructions are supplied with the accessory itself or are to be found on the packaging.

2.10 Condensate outlet/collection

In order to collect the condensate, it is recommended that:

– the appliance condensate outlets and the smoke outlet are ducted
- a neutralising device is prearranged
- the outlet incline is >3%.

CAUTION

• The condensate outlet duct must be airtight, suitably sized to that of the siphon and must not be restricted at any point.
• The condensate outlet must be constructed in full compliance of the National or Local regulations in force.
• Before commissioning the appliance, fill the siphon with water.

2.11 Gas supply

Format Slim HE 25 T boilers leave the factory prearranged for gas G20 (methane) and can also work with G31 (propane) without the need for any type of mechanical conversion. Simply select parameter"03" (see "Parameter setting and display") and set the type of gas to be used.

Boiler connection to the gas mains must be carried out in full compliance with installation Standards in force.

Before connecting the boiler to the gas mains, the user must ensure that:

• the type of gas is correct for the appliance
• the pipes are clean
• the gas supply pipe is the same dimension as or greater than that of the boiler fitting (G3/4") and with a load loss less than or equal to that contemplated between the gas mains and the boiler.

DANGER

Once installation has been completed, check that the joints are air tight as indicated in the installation Standards.

CAUTION

It is recommended that the gas line has a suitable filter.

2.12 Smoke outlet and combustion air inlet

FormatSlim HE 25 T boilers must be equipped with appropriate smoke flue ducts and combustion air inlet ducts. These ducts are considered an integral part of the boiler and are provided by HERMANN as an accessory kit, to be ordered separately from the appliance on the basis of the type permitted and the system requirements.

Permitted outlets

B23P-B53P

Combustion air inlet into the atmosphere and smoke outlet to open air.

NB: opening for combustion air (6 cm2 x kW).

C13

Concentric wall smoke outlet The pipes can start from the boiler but the outlets must be concentric or close together (no more than 50 cm) to be subject to similar wind conditions.

C33

Concentric roof smoke outlet The pipes can start from the boiler but the outlets must be concentric or close together (no more than 50 cm) to be subject to similar wind conditions.

C43

Outlet and inlet in shared or separate flue pipes but subjected to similar wind conditions.

C63

Same type as C42 but with outlet and inlet made from pipes which are sold and certified separately.

C53

Separate wall or roof inlet and outlet in different pressure areas.

NB: the inlet and outlet must never be positioned on opposing walls.

C83

Outlet in single or shared flue or with inlet on wall.

P: smoke outlet system designed to operate with positive pressure.

Fig. 14

WARNINGS

• The smoke flue and the connection to the flue pipe must be in compliance with the national and local Standards and Legislation in force.
• The use of rigid ducts which are resistant to temperature, condensate, mechanical stress and are air-tight is compulsory.
• Outlet ducts which are not isolated are a risk of danger.

2.12.1 Coaxial duct

Coaxial accessories

Description	Code
	∅ 60/100 mm	∅ 80/125 mm
Coaxial duct kit 8096250 8096253
Extension W. 1000 mm 8096150 8096171
Extension W. 500 mm 8096151 8096170
Vertical extension W. 140 mm with smoke analysis take-off point	8086950 -
Adapter for ∅ 80/125 mm - 8093150
Additional 90° curve 8095850 8095870
Additional 45° curve 8095950 8095970
Tile with joint 8091300 8091300
Roof outlet terminal W. 1284 mm 8091205	8091205

Load loss - Equivalent lengths

Model	Leq (linear metres)
	60/100 mm	80/125 mm
90° curve 1,5 2
45° curve 1 1

Minimum-Maximum Lengths

Model	Duct Length ∅ 60/100 Duct Length ∅ 80/125
	W Hori-zontal (m)		H Vertical (m)		W Hori-zontal (m)		H Vertical (m)
	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.
Format Slim HE 25 T	-	6	1,3	8	-	12	1,2	15

2.12.2 Separate ducts ( 60mm and 80mm)

Constructing outlets for separate ducts indicates the use of the "air-smoke split pipe system". This is to be ordered separately from the boiler and when connected to the other accessories, from those listed in the table below, completes the smoke-outlet/ combustion air inlet assembly.

Separate accessories

Description	Code
	Diameter ∅ 60 (mm)	Diameter ∅ 80 (mm)
Air-smoke split pipe system (without take-off point)	8093060 -
Air-smoke split pipe system (with take-off point)	- 8093050
90° curve M-F (6 pieces)	8089921 8077450
90° curve M-F (with take-off point)	8089924 -
M-F 80/60 reduction	8089923 -
Extension W. 1000 mm (6 pieces)	8089920 8077351
Extension W. 500 mm (6 pieces)	- 8077350
Extension W. 135 mm (with take-off point)	- 8077304
Wall outlet terminal	8089541 8089501
Internal and external ring nut kit 80915	10 8091500
Inlet terminal	8089540 8089500
45° curve M-F (6 pieces)	8089922 8077451
Manifold	8091400
Tile with joint	8091300
Roof outlet terminal W. 1390 mm	8091204
Inlet/outlet fitting ∅ 80/125 mm	- 8091210

Split pipe system

KEY:

1 Split pipe system with take-off point
2 Air inlet
3 Smoke outlet
4 Take-off point for smoke analysis

CAUTION

• The maximum total length of the ducts, obtained by adding the lengths of the inlet and outlet pipes, is determined by the load losses of the individual accessories used and must not exceed 15 mm H2O (for ducts ∅ 80mm and ∅ 60mm).
• The total extension must not in any case exceed 25 m (inlet) + 25 m (outlet), for ducts ∅ 80 mm, and 6 m (inlet) + 6 m (outlet) for ducts ∅ 60 mm, even if the total load loss is less than the maximum which can be applied.

Load loss accessory ∅ 60 mm

Description	Code	Load loss (mm H20)
		Format Slim HE 25 T
		Inlet Outlet
Air/smoke split pipe system	8093060	2,5	0,5
90° curve MF	8089921	0,4	0,9
45° curve MF	8089922	0,35	0,7
Horizontal extension W. 1000 mm	8089920	0,4	0,9
Vertical extension W. 1000 mm	8089920	0,4	0,6
Wall outlet terminal	8089541	-	1,2
Wall inlet terminal	8089540	0,5	-
Roof outlet terminal (*)	8091204	0,8	0,1

(*) The losses of the roof outlet terminal at inlet include the manifold code 8091400.

NB: for the boiler to operate correctly it is necessary that a minimum distance of 0.50 m of the duct is respected with a 90° inlet curve.

Load loss accessory ∅ 80 mm

Description Code		Load loss (mm H2O)
		Format Slim HE 25 T
		Inlet Outlet
90° curve MF 8077450 0,20 0,25
45° curve MF 8077451 0,15 0,15
Horizontal extension W. 1000 mm	8077351 0,15 0,15
Vertical extension W. 1000 mm	8077351 0,15 0,15
Wall terminal 8089501 0,10 0,25
Roof outlet terminal (*)	8091204 0,80 0,10

(*) The losses of the roof outlet terminal at inlet include the manifold code 8091400.

NB: for the boiler to operate correctly it is necessary that a minimum distance of 0.50 m of the duct is respected with a 90° inlet curve.

Example: calculation of the load loss of a Format Slim HE 25 T boiler (ducts ∅ 80 mm).

Accessories ∅80 mm	Code	Quan-tity	Load loss (mm H20)
			Inlet Out	Outlet Total
Extension W. 1000 mm (horizontal)	8077351	7 7 x	0,15 - 1,05
Extension W. 1000 mm (horizontal)	8077351	7 - 7 x	0,15 1,05
90° curve	8077450	2 2 x	0,20 - 0,40
90° curve	8077450	2 - 2 x	0,25 0,50
Wall terminal	8089501	2 0,10	0,25 0,35
TOTAL 3,35

(installation permitted since the total of the load loss of the accessories used is less than 15 mm H20).

2.13 Electrical connections

The boiler is equipped with a ready wired power cable which is to be connected to a 230V\~50 Hz network.

If this cable needs to be replaced, an original spare must be requested from HERMANN.

Therefore only the connections of the original components as shown in the table are needed. These are to be ordered separately from the boiler.

DESCRIPTION	CODE
External sensor kit (β=3435, NTC 10KOhm at 25°C)	8094101
Power cable (dedicated)	6323875
Remote control CR 63 (open therm)	8092219
Remote control CR 73 (open therm)	8092226
Remote control CR 83 (open therm)	8092241
Remote control HOME (open therm)	8092280
Remote control HOME PLUS (open therm)	8092281

CAUTION

The maintenance interventions described must ONLY be carried out the professionally qualified personnel.

DANGER

Before carrying out any interventions described:

• set the main system switch to "OFF"
• close the gas valve
• make sure that no hot parts inside the appliance are touched.

Fig. 17

To facilitate introduction of the connection wires of the optional components into the boiler:
- remove the two screws (1), pull the front panel (2) forwards and release it from the top by lifting it

Fig. 18

• remove the screws (3) securing the control panel (4)
• move the panel (4) upwards (a) but keeping it in the side guides (5) to the end of travel
• bring it forwards and down (b) until it is horizontal

- insert the connection wires into the cable gland (6) and the opening (7) on the control panel

- bring the control panel (4) to the original position and secure it with the screws (3) which were removed previously - connect the component wires to the terminal board (8) following the indications provided on the data plate (9).

CAUTION

It is compulsory:

• to use an omnipolar cut-off switch, disconnect switch in compliance with EN Standards
• if the power cable is to be replaced, that ONLY a special cable is used with a factory produced re-wired connector, ordered as a spare part and connected by a professionally qualified person
• to connect the earth wire to an effective earthing system (*)
• that before any intervention on the boiler, the mains power is disconnected by setting the main system switch to "OFF".

(*) The manufacturer is not responsible for any damage caused by failure to earth the appliance or failure to observe the information provided in the wiring diagrams.

IT IS FORBIDDEN

To use water pipes for earthing the appliance.

2.13.1 External sensor

The boiler is prearranged for connection to an external air temperature sensor and can operate with a sliding temperature.

This means that the delivery temperature sent to the boiler can vary on the basis of the external temperature depending on the climatic curve selected from those shown in the diaphragm (default curve no. 20).

When fitting the sensor on the outside of the building, follow the instructions provided on the packaging of the product itself.

Climatic curve
Delivery temperature

Fig. 22

CAUTION

The curves are calculated with an air temperature of 20^ C. By acting on the knob, on the control panel, the user can change the delivery temperature with which the curve will be calculated by ±5^ C.

2.13.2 Chrono-thermostat or Air Thermostat

The electrical connection of the chrono-thermostat or air thermostat has already been described. When fitting the component in the room where the readings are to be taken, follow the instructions provided on the packaging of the product itself.

2.13.3 EXAMPLE of use of the command/control device on some types of heating systems

KEY

M System delivery

R System return

Mb Hot water tank delivery

Rb Hot water tank return

CR Remote control

EXP Expansion card

SE External sensor

SB Hot water tank sensor

TA÷TA3 Air thermostat for the zone

VZ1-VZ3 Zone valves

RL1-RL3 Zone relays

P1-P3 Zone pump

SI Hydraulic separator

ONE DIRECT ZONE system and REMOTE HOT WATER TANK, external sensor and air thermostat or, alternatively, remote control.

graph TD
    A["SE"] --> B["M"]
    C["CR"] --> D["TA"]
    D --> E["MbRb"]
    F["Z"] --> G["Actuator"]
    H["SB"] --> I["Pressure Gauge"]
    style A fill:#f9f,stroke:#333
    style C fill:#f9f,stroke:#333
    style D fill:#f9f,stroke:#333
    style E fill:#ccf,stroke:#333
    style F fill:#cfc,stroke:#333
    style G fill:#fcc,stroke:#333
    style H fill:#cff,stroke:#333
    style I fill:#ffc,stroke:#333

CAUTION

The boiler is pre-arranged for connection to a remote hot water tank. To use the boiler for HEATING ONLY:

- disconnect the hot water tank sensor (SB)

- set "PAR 02 = HYDRAULIC CONFIGURATION" to 1. This operation must only be carried out by Professionally Qualified Personnel during the boiler commissioning phase.

ONE DIRECT ZONE system, external sensor and air thermostat or, alternatively, remote control.

graph TD
    A["SE"] --> B["M"]
    C["CR"] --> B
    D["TA"] --> B
    B --> E["R"]
    E --> F["Z"]
    style A fill:#f9f,stroke:#333
    style C fill:#ccf,stroke:#333
    style D fill:#cfc,stroke:#333
    style E fill:#fcc,stroke:#333
    style F fill:#ffc,stroke:#333

MULTI ZONE system -with pump, air thermostat and external sensor.

graph TD
    A["TA"] --> B["SE"]
    B --> C["M"]
    C --> D["R"]
    D --> E["SI"]
    E --> F["P1"]
    E --> G["P2"]
    E --> H["P3"]
    F --> I["Z↓"]
    G --> J["Z↓"]
    H --> K["Z↓"]
    L["TA1"] --> M["RL1"]
    N["TA2"] --> O["RL2"]
    P["TA3"] --> Q["RL3"]
    style A fill:#f9f,stroke:#333
    style L fill:#ccf,stroke:#333
    style N fill:#ccf,stroke:#333
    style P fill:#cfc,stroke:#333
    style Q fill:#cfc,stroke:#333

MULTI ZONE system -with zone valve, air thermostat and external sensor.

graph TD
    A["TEA"] --> B["TEA1"]
    C["SE"] --> D["M"]
    E["R"] --> F["VZ1"]
    G["TA2"] --> H["VZ2"]
    I["TA3"] --> J["VZ3"]
    K["Z1"] --> L["Z1"]
    M["Z1"] --> N["Z1"]
    O["→"] --> P["Valve 1"]
    Q["→"] --> R["Valve 2"]
    S["→"] --> T["Valve 3"]

CAUTION

Set the parameter "tS 17 = DELAY SYSTEM PUMP ACTIVATION to allow the opening of zone valve Vz.

2.14 Refilling or emptying

Before carrying out the operation described below, make sure that the main system switch is set to "OFF".

Fig. 27

2.14.1 REFILL operations

The Format Slim HE 25 T boilers are not equipped with a filling valve which must be prearranged on the system return.

Remove the front panel:

- remove the two screws (1), pull the front panel (2) forwards and release it from the top by lifting it.

Fig. 28

Domestic hot water circuit (storage tank):

• open the isolation valves of the domestic hot water circuit (if present)
• open one or more than one hot water valve to fill and bleed the domestic hot water circuit
• once bleeding has been completed, close the hot water valves.

Heating circuit:

• open the isolation and air bleeding valves in the highest points of the system
• loosen the automatic bleed valve (3)
• open the isolation valves of the heating circuit (if present)
• open the filling valve, which is to be prearranged on the system return, and fill until the pressure reaches 1-1,2 bar
• close the filling valve
• check that there is no air in the system by bleeding all the radiators and the circuit on the high points of the system
• remove the front plug (4) of the pump and use a screwdriver to check that the impeller is not blocked
• replace the plug (4)

NB: to completely remove all air from the system, it is recommended that this operation is repeated a number of times.

• check the pressure in the system and if necessary top up until the correct pressure is reached
• close the automatic bleed valve (3)
• fill the siphon disconnecting it from the pipe or using (by means of) the smoke take-off point.

Refit the front panel of the boiler hooking it on at the top, pushing it forwards and securing it with the screw (1) which was removed previously.

2.14.2 EMPTYING operations

Domestic hot water circuit (storage tank):

• close the domestic hot water circuit isolation valve (prearranged in installation)
• open the drain valve prearranged on the storage tank or the system.

Boiler:

• loosen the automatic bleed valve (3)
• close the heating circuit isolation valves (prearranged in installation)
• check that the filling valve which was prearranged during installation is closed
• connect a rubber hose to the boiler drain valve (5) and open it
• when it has fully emptied, close the drain valve (5)
• close the automatic bleed valve (3).

Fig. 30

3 COMMISSIONING

3.1 Preliminary operations

Before commissioning the appliance, check that:

• the type of gas is correct for the appliance
• the gas isolation valves for the heating system and the water system are open
• the system pressure as shown on the pressure gauge when the system is cold, is between 1 and 1.2 bar
• the pump impeller rotates freely.

3.2 Before commissioning

After having carried out the preliminary operations, perform the following to start the boiler:

- set the main system switch to "ON"

- the type of gas for which the boiler has been calibrated, "nG" (methane) or "LG" (LPG,) will appear followed by the power. After this the correct representation of the symbols will be checked and finally "-"will appear on the display

- press the button once for at least 1 second to select "SUMMER mode" ⚙. the value of the delivery sensor detected at that moment will appear on the display

3.2.1 Self-calibrating procedure

Carry out the "Automatic self-calibrating procedure" as follows:

- press and hold down the buttons— and + at the same time for approximately 12 seconds until the flashing symbols and ✕ appear on the display

Simple diagram with two sun icons and a horizontal line, no text or symbols present

• as soon as the symbols begin to flash, release the buttons— and + and press the button ⏻R, within 3 seconds
• the "Automatic self-calibrating procedure" starts
• open one or more than one hot water tap
• the values flash on the display: "99" (maximum value), followed by an "intermediate value" and finally "00" (minimum value)

**	**	**
99	53	00

The operator must wait for approximately 15 minutes for the "self-calibrating procedure" to end and the message "SUM-MER mode" to reappear on the display Once the procedure has terminated:

- close the taps opened previously and check that the appliance shuts down.

if there is a fault, the message "ALL" will appear on the display, the fault code (eg. "06" - no flame detected) and the message RESET

CAUTION

To restore the start conditions press and hold the button OR for more than 3 seconds. This operation can be performed up to a maximum of 6 times without the "self-calibrating procedure" being interrupted.

- press the button ⏻R once to select "WINTER mode" 🌿 the value of the heating water temperature detected at that moment will appear on the display

• adjust the air thermostat and check that the boiler starts and operates correctly
• carry out the procedure "Chimney sweep function", to check the mains gas pressure, detect the combustion parameters and to measure the combustion efficiency required by legislation in force..

3.3 Parameter setting and display

To go into the parameter menu:

- from the selected mode (eg. WINTER)

- press the buttons and 1111 (for approximately 5 seconds) at the same time until "PAR 01" (parameter number) and the value set (0-4) appears on the display

- press the button to scroll up the list of parameters and then to scroll down the list

NB: holding the buttons 📁 or 1111 increases the speed of the scrolling movement.

- once the required parameter has been reached, press the buttons+ or -to modify the value within the permitted range. The modifications are stored automatically.

When all the parameter modifications have been made, exit the parameter menu by pressing and holding down the buttons and at the same time until the initial screen is displayed.

3.4 List of parameters

Type No.	Description Range			Unit of measurement	Step Default
CONFIGURATION
PAR 01		Index showing boiler power in kW0=24; 1=25; 2=30; 3=35; 4=40	0..3-11
PAR 02		Hydraulic configuration0 = rapid1 = storage tank with thermostat or heating only2 = hot water tank with sensor3 = two programmer	0..3-12
PAR 03		Gas Type Configuration0 = G20; 1 = G31	0..1-10
PAR 04		Combustion configuration0 = sealed chamber with combustion control1 = open chamber with smoke probe	0..1-10
PAR 07	Ignition power 0..40% 10
PAR	08	External sensor value correction	-5..+5	°C	1	0
Type	No. Description Range			Unit of measurement	Step Default
DOMESTIC HOT WATER - HEATING
PAR 10	Boiler	Antifreeze Threshold 0 .. +10 °C 1 3
PAR 11	External Sensor Antifreeze Threshold		-9 .. +5-- = Disabled	°C 1 -2
PAR 12	Heating Curve Incline 0 .. 80 - 1 20
PAR	13	Minimum Heating Temperature Adjustment	20 .. Par tS 1.4	°C	1	20
PAR	14	Maximum Heating Temperature Adjustment	Par tS 1.3 .. 80	°C	1	80
PAR 16	Heating Post-Circulation Time		0 .. 99	seconds x 10	1	3
PAR 17	Heating Pump Activation Delay		0 .. 60	seconds x 10	1	1
PAR	18	Re-ignition Delay	0 .. 60	Min	1	3
PAR 19	Domestic Hot Water Modulation with Flow meter		-- = Disabled1 = Enabled	-	-	1
PAR	26	Zone Valve / Pump Relaunch Delay	0 .. 99	Min	1	0
PAR 29	Anti-legionella Function (Only hot water tank)		-- = Disabled50 .. 80	-	1	--
PAR 35		Digital / analogue Pressure switch0 = water pressure switch1 = water pressure transducer2 = water pressure transducer (only pressure displayed)	0 .. 2	-	1 1
PAR 40	Modulating Pump Speed		-- = No modulationAU = Automatic 30 .. 100	%	10	AU
PAR	41	ΔT Modulating pump delivery/Return	10 .. 40	%	1	20
PAR 47	System pump forcing (only in winter mode)		0 = Disabled1 = Enabled	-	-	0
RESET
PAR	48	INST Parameter set to default	-- ; 1	-	-	-

In the event of a fault/malfunction the message "ALL" will appear on the display with the alarm number eg. "ALL 04" (Domestic Hot Water Sensor Fault).

Before repairing the fault:

- disconnect the appliance from the mains power by setting the main switch to "OFF"

- as a precautionary measure, close the gas isolation valve.

Repair the fault and start-up the boiler again.

NB: after having repaired the fault, when the alarm number appears on the display together with the message RESET (see figure) press the button OR to start the appliance up again.

3.5 Fault / malfunction codes

Type No. Description
ALL 02	Low water pressure in system
ALL 04	Domestic hot water sensor fault
ALL 05	Delivery sensor fault
ALL 06	No flame detection
ALL 07	Sensor or safety thermostat intervenes
ALL 08	Fault in the flame detection circuit
ALL 09	No water circulating in the system
ALL 11	Gas valve modulator disconnected
ALL 12
ALL 15	Fan check cable disconnected
ALL 17
ALL 28	Maximum number of consecutive releases
ALL 37	Fault due to low network voltage
ALL 40	Incorrect network frequency detected
ALL 41	Flame loss more than 6 consecutive times
ALL 42	Button fault
ALL 74	Fault in the 2nd element of the delivery sensor
ALL 81	Block due combustion during start-up
ALL 83	Irregular combustion (temporary error)
ALL 96	Block due to clogging in smoke outlet

3.6 Display of operating data and counters

Once the boiler is operating a qualified technician can view the operating data and the counters as follows:>

- from the operating screen in the mode enabled at that moment (WINTER or SUMMER)

- go into "DISPLAY" by pressing the buttons and - at the same time for more than 3 seconds until the following screen appears

From this point, the technician has 2 options:

- scroll through the list of "information (PAR)" and "counters (PARc)" by pressing the button 1111. Scrolling will be in sequence

- display the "activated alarms" (no more than 10) by pressing the button

- Once in this section, proceed with button 111 or 2.

When all the values have been displayed, exit the menu by pressing and holding down the button ⏻R for a few seconds until the initial screen is displayed.

TABLE OF INFORMATION DISPLAYED

Type No.	Description	Range	Unit of measurement	Step
PAR 00	SW version
PAR 01	External sensor	-9..99	°C	1
PAR 02		Delivery sensor 1 temperature	-9..99	°C
PAR 03		Delivery sensor 2 temperature	-9..99	°C
PAR 04		Domestic hot water sensor temperature	-9..99	°C
PAR 05		AUX auxiliary sensor	-9..99	°C
PAR 06		Actual heating SET temperature	Par.13...Par.14	°C
PAR 07	Power level	0..99	%	1
PAR 08	Flow meter rate	0..99	l/min 0.1
PAR 09		Water pressure transducer reading (if resent)	0...99	bar 0.1

TABLE OF COUNTER DISPLAYED

Type No.	Description	Range	Unit of measurement	Step
PAR c0		total no. of boiler operating hours	0..99	h x 1000
PAR c1		total no. of burner operating hours	0..99	h x 1000
PAR c2		total no. of burner ignitions	0..99	h x 1000
PAR c3	total no. faults	0..99	x 1 1
PAR c4		total no. of times installer parameters "IS" accessed	0..99	x 1 1
PAR c5		total no. of times OEM parameters accessed	0..99	x 1 1

TABLE OF ACTIVATED ALARMS/FAULTS

Type No. Description
PAR	A0	Last activated alarm/fault
PAR	A1	Last but one activated alarm/fault
PAR	A2	Third from last activated alarm/fault
PAR	A3	Previous activated alarm/fault
PAR	A4	Previous activated alarm/fault
PAR	A5	Previous activated alarm/fault
PAR	A6	Previous activated alarm/fault
PAR	A7	Previous activated alarm/fault
PAR	A8	Previous activated alarm/fault
PAR	A9	Previous activated alarm/fault

3.7 Checks

3.7.1 Chimney sweep function

The chimney sweep function is used by the qualified maintenance technician to check the mains gas pressure, detect the combustion parameters and to measure the combustion efficiency required by legislation in force.

This function lasts 15 minutes and is activated by proceeding as follows:

- if the panel (2) has not already been removed, remove the two screws (1), pull the front panel (2) forwards and release it from the top by lifting it

• remove the screws (3) securing the control panel (4)
• move the panel (4) upwards (a) but keeping it in the side guides (5) to the end of travel
• bring it forwards and down (b) until it is horizontal

• close the gas valve
• loosen the screw of the "mains pressure" point (6) and connect a pressure gauge

• open the gas valve
• power the boiler by setting the main switch to "ON"

• press the button ⏻R until "SUMMER" mode ⚙has been selected
• press and hold down the buttons - and + at the same time for approximately 5 seconds until the message "Hi" appears on the display together with the flashing symbols 🙏 and

• press the button+ to make the boiler operate at maximum power "Hi" and check that the mains gas pressure value on the pressure gauge is correct. Take a reading of the combustion data and measure the combustion efficiency.
• press the button—to make the boiler operate at minimum power "Lo". The message "Lo" will appear on the display together with the flashing symbols and

• take the combustion data reading
• press the button ⬇R to exit the "Chimney sweep Procedure". The boiler water delivery temperature will appear on the display

- disconnect the pressure gauge, carefully close the pressure point (6), put the control panel back to the original position and refit the front panel (2).

Gas supply pressure

Type of gas G20 G31
Pressure (mbar) 20 37

3.8 Gas conversion

Format Slim HE 25 T models can work with G20 (methane) or G31 (propane) without the need for any mechanical conversion. Simply select parameter "PAR 03" (see "Parameter setting and display" described on page 21) and set the type of gas to be used.

If changing the type of gas to be used, carry out the entire appliance "COMMISSIONING" phase.

4 MAINTENANCE

4.1 Adjustments

For the appliance to operate correctly and efficiently it is recommended that the User calls upon the services of a Professionally Qualified Technician to carry out ANNUAL maintenance.

CAUTION

The maintenance interventions described must ONLY be carried out the professionally qualified personnel.

DANGER

Before carrying out any interventions described:

• set the main system switch to "OFF"
• close the gas valve
• make sure that no hot parts inside the appliance are touched.

Fig. 37

4.2 External cleaning

4.2.1 Cleaning the cladding

When cleaning the cladding, use a cloth dampened with soap and water or alcohol for stubborn marks.

IT IS FORBIDDEN

to use abrasive products.

4.3 Cleaning the inside of the appliance

4.3.1 Removing components

To access the internal parts of the boiler:

- remove the two screws (1), pull the front panel (2) forwards and release it from the top by lifting it

• remove the screws (3) securing the control panel (4)
• move the panel (4) upwards (a) but keeping it in the side guides (5) to the end of travel
• bring it forwards and down (b) until it is horizontal

• loosen the clips (6) and extract the air inlet pipe (7)
• unscrew the swivel joint (8)
• extract the connectors (9) from the fan and disconnect the electrode cable (10)

• Unscrew the four nuts (11) securing the combustion chamber door (12)
• pull the fan-sleeve-door assembly (13) forwards and remove it.

CAUTION

Work carefully when removing the assembly (13) to prevent any damage occurring to the internal insulation of the combustion chamber and the door seal.

4.3.2 Cleaning the burner and the combustion chamber

The combustion chamber and the burner do not require any particular maintenance. Simply brush them with a soft brush.

4.3.3 Final operations

After having cleaned the combustion chamber and the burner:

• remove any carbon residue
• check the state of the ignition/detection electrode and replace if necessary
• check that the seal and the insulation of the door (12) to the combustion chamber are integral. Replace if necessary
• refit the assembly by carrying out the same operations for removal but in the reverse order and tighten the screws (11) of the door to the combustion chamber
• reconnect the connections to the fan and the electrode.

4.4 Checks

4.4.1 Checking the smoke duct

It is recommended that the user checks that the combustion air inlet duct and smoke outlet duct are integral and airtight.

4.4.2 Checking the expansion vessel pressure

It is recommended that the expansion vessel on the water side is drained and that the refilling pressure is not less than 1 bar. If this is not the case, pressurize it to the correct value (see section Expansion vessel).

Once the checks described above have been completed:

• refill the boiler as described in section "REFILL operations"
• check that the siphon has been filled correctly
• activate the "Chimney sweep function" and carry out a smoke analysis and/or measure the combustion efficiency
• refit the front panel securing it with the two screws which were removed previously.

4.5 Unscheduled maintenance

If replacing the electronic board, the user MUST set the parameters as indicated in the table.

Type No. Description Setting
PAR 01		Index showing boiler power in kW0=24; 1=25; 2=30; 3=35; 4=40
PAR 02		Hydraulic configuration0 = rapid1 = storage tank with thermostat or heating only2 = hot water tank with sensor3 = two programmer
PAR 03		Gas Type Configuration0 = G20; 1 = LPG
PAR 04		Combustion configuration0 = sealed chamber with combustion control1 = open chamber with smoke thermostat

To enter "Parameter setting and display" refer to the indications provided in the specific section.

Once the parameters in the table have been set, you must carry out the entire phase of "Commissioning" described in the specific section.

4.6 Possible faults and solutions LIST OF MALFUNCTION/FAULT ALARMS

Type No. Fault Solution
ALL 02	No flame detection	Low water pressure in system	- Restore pressure- Check for any leaks in the system
ALL 04		Domestic hot water sensor fault	- Check connections- Replace the sensor
ALL 05		Sensor fault	- Check connections- Replace the sensor
ALL 06			- Check the integrity of the electrode and check that it is not grounded- Check gas availability and pressure- Check the integrity of the gas valve and the card
ALL 07		Sensor or safety thermostat intervenes	- Check the sensor or thermostat connec-tions- Deaerate the system- Check the bleed valve- Replace the sensor or the thermostat- Check that the pump impeller is not blocked
ALL 08		Fault in the flame detec-tion circuit	- Check the integrity of the electrode and check that it is not grounded- Check gas availability and pressure- Check the integrity of the gas valve and the card
ALL 09		No water circulating in the system	- Check the rotation of the system pump impeller- Check the electrical connections- Replace the pump
ALL 11		Gas valve modulator disconnected	- Check the electrical connection
ALL 12		Incorrect configuration of the open /sealed chamber	- Set the parameter tS 0.4 (Combustion configuration) to 0
ALL 15		Fan check cable discon-nected	- Check the connection cable between the fan and the board
ALL 17		Fault regarding maxi-mum deviation between the 2 NTC heating sensors	- Replace the dual sensor
ALL 28		Maximum number of consecutive releases reached	- Contact the Technical Assistance Centre
ALL 37		Fault due to low network voltage.	- Check with tester- Contact network pro-vider (ENEL)
ALL 40		Incorrect network fre-quency detected	- Contact network pro-vider (ENEL)

Type No. Fault		Solution
ALL 41		Flame loss more than 6 consecutive times	- Check the detection electrode- Check the gas supply (open valve)- Check mains gas pressure
ALL 42	Button	fault	- Check that buttons are working
ALL 74		Fault in the 2nd element of the delivery sensor	- Replace the sensor
ALL 81		Block due to combustion during start-up	- Check for blockage in chimney- Bleed the air from the gas circuit
ALL 83		Irregular combustion (temporary error)	- Check for blockage in chimney
ALL 96		Block due to clogging in smoke outlet	- Check for blockage in chimney
-	-	Frequent relief valve intervention	- Check circuit pressure- Check expansion vessel
-	-	Limited production of domestic hot water	- Check the diverter valve- Check that plate heat exchanger is clean- Check domestic hot water circuit valve

SAFETY WARNINGS AND REGULATIONS

For the "SAFETY WARNINGS AND REGULATIONS" please refer to the information provided in the relevant section of the "INSTALLATION AND MAINTENANCE MANUAL".

SYMBOLS

DANGER

To indicate actions which, if not carried out correctly, can result in injury of a general nature or may damage or cause the appliance to malfunction; these actions therefore require particular caution and adequate preparation.

DANGER

To indicate actions which, if not carried out correctly, could lead to injury of an electrical nature; these actions therefore require particular caution and adequate preparation.

IT IS FORBIDDEN

To indicate actions which MUST NOT BE carried out.

CAUTION

To indicate particularly important and useful information.

TABLE OF CONTENTS

1 COMMISSIONING 31

1.1 Preliminary checks
1.2 Ignition
1.3 Adjusting the heating temperature
1.4 Adjusting the domestic hot water temperature
1.5 Fault / malfunction codes

2 SHUTDOWN 32

2.1 Temporary shutdown
2.2 Shutting down for long periods

3 MAINTENANCE 33

3.1 Adjustments
3.2 External cleaning

3.2.1 Cleaning the cladding

4 DISPOSAL 33

4.1 Disposal of the equipment (European Directive 2002/96/CE)

1 COMMISSIONING

1.1 Preliminary checks

Commissioning of the Format Slim HE 25 T boiler must be carried out by professionally qualified Personnel after which the boiler can operate automatically. It may however be necessary for the User to start the appliance autonomously without involving a technician: for example, after a holiday. First of all check that the gas isolation and water system valves are open.

1.2 Ignition

After having carried out the preliminary checks, perform the following to start the boiler:

• set the main system switch to "ON" in order for the display to show the pressure level in the system during refilling
• make sure that the operating mode is set to "Stand-by; if this is not the case, press the button OR until "Stand-by" mode has been selected

- on the display (1), check that the heating system pressure when cold is 1-1.2 bar. If this is not the case, open the filling valve (2) and restore the heating system pressure until the display (1) shows a reading of 1-1.2 bar - close the filling valve (2)

- select the "SUMMER" operating mode by pressing and holding the ⏻Rbutton for at least 1 second, the value of the delivery sensor detected at that moment will appear on the display

- open one or more than one hot water tap. The boiler will work at maximum power until the taps are closed.

Once the boiler has been commissioned in "SUMMER mode" "WINTER mode" can be selected by pressing and holding the button R for at least 1 second. The value of the delivery water temperature detected at that moment will appear on the display. In this case it is necessary to adjust the air thermostat/s to the required temperature or if the system has a chrono-thermostat, check that this is "active" and adjusted.

1.3 Adjusting the heating temperature

If the heating temperature is to be increased or decreased, press the button followed by the buttons + or - until the desired temperature is reached. The temperature can be set to between 20 and 80°C.

1.4 Adjusting the domestic hot water temperature

If the domestic hot water temperature is to be increased or decreased, press the button followed by the buttons + or - until the desired temperature is reached. The temperature can be set to between 10 and 60°C.

1.5 Fault / malfunction codes

If a fault/malfunction is detected during boiler operation, the message "ALL" will appear on the display followed by the fault code (eg. "06" - no flame detected).

If the message RESET ☑ also appears, press and hold the button ⏻R for more than 3 seconds and check that the normal operating conditions are restored.

If this operation is not successful, ONLY ONE MORE ATTEMPT can be made, therefore:

• close the gas isolation valve
• set the main system switch to "OFF"
• contact the Qualified Technical Personnel.

CAUTION

The table with the fault codes and the corresponding description is provided in the specific section of the INSTALLATION AND MAINTENANCE MANUAL.

2 SHUTDOWN

2.1 Temporary shutdown

If the user wishes to interrupt boiler operation, press and hold the button OR for at least one second, once if in "WINTER mode" or twice if in "SUMMER mode". "--" will appear on the display.

DANGER

The boiler will still be powered.

If the user is away temporarily, for a weekend, short trip etc and if the outside temperature is at ZERO:

- press and hold the button 📍 once if in "WINTER mode" or twice if in "SUMMER mode" to put the boiler into stand-by

• set the main system switch to "OFF"
• close the gas valve.

CAUTION

If the outside temperature might fall below ZERO, since the appliance is equipped with an "antifreeze function"

• ONLY PUT THE BOILER INTO STAND-BY
• leave the main system switch set to "ON" (boiler is powered)
• leave the gas valve open.

2.2 Shutting down for long periods

If the boiler is to be left unused for a long period, the following operations need to be carried out:

- press and hold the button OR for at least 1 second, once if in "WINTER mode" or twice if in "SUMMER mode" to put the boiler into stand-by "-" will appear on the display

- set the main system switch to "OFF"

• close the gas valve
  – close the heating and domestic hot water isolation valves
• drain the heating and domestic hot water system if there is the risk of freezing.

CAUTION

Contact the Qualified Technical Personnel if the procedure described above cannot be easily carried out.

3 MAINTENANCE

4 DISPOSAL

3.1 Adjustments

For the appliance to operate correctly and efficiently it is recommended that the User calls upon the services of a Professionally Qualified Technician to carry out ANNUAL maintenance.

CAUTION

Maintenance interventions must ONLY be carried out by professionally qualified personnel who will follow the indications provided in the INSTALLATION AND MAINTENANCE MANUAL.

3.2 External cleaning

3.2.1 Cleaning the cladding

When cleaning the cladding, use a cloth dampened with soap and water or alcohol for stubborn marks.

IT IS FORBIDDEN

to use abrasive products.

4.1 Disposal of the equipment (European Directive 2002/96/CE

Once it reaches the end of its operating life, the equipment MUST BE RECYCLED in line with current legislatio.

IT MUST NOT be disposed of together with urban waste.

It can be handed over to recycling centres, if there are any, or to retailers that offer this service.

Recycling prevents potential damage to the environment and health. It allows to recover a number of recyclable materials, with considerable savings in terms of money and energy.

HERMANN tepelná technika s.r.o.

Dubenec 212, 544 55 Dubenec

tel.: [phone]

e-mail.: [e-mail]

HERMANN reserves the right to make changes at any time without prior notice in order to improve its products without compromising the essential characteristics.