SI 26TU - Heat pump DIMPLEX - Free user manual and instructions

Product type	Brine-to-water heat pump for indoor installation
Brand	Dimplex
Model	SI 26TU
Dimensions (H x W x D)	880 x 1000 x 750 mm
Weight (with packaging)	275 kg
Power supply	3~/PE 400 V (50 Hz), fuse C 20A, type A
Control power supply	1~/N/PE 230 V (50 Hz), fuse C 13A, type A
Rated power input (B0/W35)	5.45 kW
Nominal heating output (Prated)	25 kW
Coefficient of performance (COP) at B0/W35	5.1
Seasonal energy efficiency (ηs)	143 %
Max water outlet temperature	62 °C
Heat source temperature range	-5 °C to +25 °C (extendable to -10 °C with 30% glycol)
Refrigerant	R410A, 8.4 kg, GWP 2088, CO₂ equivalent 18 t
Sound power level	57 dB(A)
Sound pressure level at 1 m	41 dB(A)
Heating and source connections	G 1 1/2" A (external thread)
Maintenance	Clean the condenser with 5% phosphoric acid or 5% formic acid; clean the strainer of the dirt separator
Safety	Integrated frost protection; max test pressure 6.0 bar; omnipolar emergency shutdown
Included accessories	NTC-2 outdoor temperature sensor, dirt separator
Warranty	Subject to commissioning by an approved after-sales service

Frequently Asked Questions - SI 26TU DIMPLEX

What type of heat pump is the Dimplex SI 26TU?

It is a brine-to-water heat pump designed for indoor installation, using a geothermal heat source via probes or collectors.

What are the dimensions and weight of the unit?

The dimensions are 880 x 1000 x 750 mm (H x W x D) and the weight with packaging is 275 kg.

What is the required power supply?

The power supply requires 3~/PE 400 V (50 Hz) with fuse C 20A, and the control requires 1~/N/PE 230 V (50 Hz) with fuse C 13A.

What is the nominal heating output?

The nominal heating output (Prated) is 25 kW according to EU Regulation 813/2013.

What is the coefficient of performance (COP) at nominal conditions?

The COP is 5.1 for the operating point B0/W35 (source 0 °C, outlet 35 °C).

Up to what outlet temperature can the heat pump operate?

The maximum heating water outlet temperature is 62 °C.

What refrigerant does it use and what is its environmental impact?

The refrigerant is R410A with a global warming potential (GWP) of 2088 and a CO₂ equivalent of 18 tonnes.

How to maintain the heat pump?

You should clean the condenser with a 5% phosphoric acid or 5% formic acid solution, and regularly check the strainer of the dirt separator on the source side.

What are the important safety instructions?

Never exceed the test pressure of 6.0 bar, use an omnipolar disconnector, and wait 5 minutes after shutdown before opening the unit.

Can I use the heat pump with an existing system?

Yes, it can be integrated into new or existing installations, provided that the heating circuit is flushed and the filling water meets the hardness criteria according to VDI 2035.

USER MANUAL SI 26TU DIMPLEX

Isometric line drawing of a 3D box with a small square lid on one face (no text or symbols)

Installation and Operating Instruction

Brine-to-Water Heat Pump for Indoor Installation

1) Schaltkasten
2) Verdampfer
3) Verflüssiger
4) Filtertrockner
5) Verdichter 1
6) Verdichter 2
7) Expansionsventil
8) Economizer

4 Z u b e h ö r

Technical line drawing of an industrial machine with internal components and a close-up view of the base assembly (no text or symbols)

ACHTUNG!

6 Aufstellun

Empty white rectangle with black border (no text or symbols)

Table of contents

1 Safety notes......EN-2

1.1 Symbols and markings......EN-2
1.2 Intended use......EN-2
1.3 Legal regulations and directives....EN-2
1.4 Energy-efficient use of the heat pump......EN-2

2 Intended use of the heat pump ......EN-2

2.1 Intended purpose......EN-2
2.2 Operating principle......EN-2

3 Basic device......EN-3

4 Accessories....EN-3

4.1 Connection flange....EN-3
4.2 Remote control......EN-3
4.3 Building management system......EN-3

5 Transport......EN-3

6 Installation....EN-4

6.1 General Information......EN-4
6.2 Acoustic Emissions....EN-4

7 Installation....EN-4

7.1 General......EN-4
7.2 Connection on the heating side......EN-5
7.3 Heat source connection....EN-5
7.4 Temperature sensor....EN-6
7.5 Electrical connection....EN-7

8 Commissioning......EN-8

8.1 General Information......EN-8
8.2 Preparation......EN-8
8.3 Commissioning procedure....EN-8

9 Cleaning / maintenance......EN-9

9.1 Maintenance....EN-9
9.2 Cleaning the heating system ....EN-9
9.3 Cleaning the heat source system......EN-9

10 Faults / troubleshooting......EN-9

11 Decommissioning / disposal......EN-9

12 Device information ...... EN-10

13 Product information as per Regulation (EU) No 813/2013, Annex II, Table 2......EN-12

Anhang / Appendix / Annexes ...... A-I

Maßbilder / Dimension Drawings / Schémas cotés....A-II

Diagramme / Diagrams / Diagrammes....A-III

1.1 Symbols and markings

Particularly important information in these instructions is marked with CAUTION! and NOTE.

CAUTION!

Immediate danger to life or danger of severe personal injury or significant damage to property.

NOTE

Risk of damage to property or minor personal injury or important information with no further risk of personal injury or damage to property.

1.2 Intended use

This device is only intended for use as specified by the manufacturer. Any other use beyond that intended by the manufacturer is prohibited. This requires the user to abide by the relevant project planning documents. Please refrain from tampering with or altering the device.

1.3 Legal regulations and directives

This heat pump is designed for use in a domestic environment according to Article 1, Paragraph 2 k) of EU directive 2006/42/EC (machinery directive) and is thus subject to the requirements of EU directive 2014/35/EU (low-voltage directive). It is thus also intended for use by non-professionals for heating shops, offices and other similar working environments, agricultural establishments and hotels, guesthouses and other residential buildings.

This heat pump conforms to all relevant DIN/VDE regulations and EU directives. Refer to the EC Declaration of Conformity in the appendix for details.

The heat pump must be connected to the power supply in compliance with all relevant VDE, EN and IEC standards. Any further connection requirements stipulated by local utility companies must also be observed.

The heat pump is to be connected to the heat source system and the heating system in accordance with all applicable regulations.

This unit can be used by children aged 8 and over and by persons with limited physical, sensory or mental aptitude or lack of experience and/or knowledge, providing they are supervised or have been instructed in the safe use of the unit and understand the associated potential dangers.

Children must not play with the device. Cleaning and user maintenance must not be carried out by children without supervision.

CAUTION!

Work on the heat pump must only be performed by authorised and qualified after-sales service technicians!

CAUTION!

When operating or maintaining a heat pump, the legal requirements of the country where the heat pump is operated apply. Depending on the refrigerant fill quantity, the heat pump must be inspected for leaks at regular intervals by a certified technician, and these inspections must be recorded.

More information can be found in the accompanying log book.

1.4 Energy-efficient use of the heat pump

By operating this heat pump you are helping to protect our environment. Both the heating system and the heat source must be properly designed and dimensioned to ensure efficient operation. It is particularly important to keep water flow temperatures as low as possible. All connected heat consumers should therefore be suitable for low flow temperatures. Raising the heating water temperature by 1 K corresponds to an increase in electricity consumption of approx. 2.5 %. Low-temperature heating systems with flow temperatures between 30 °C and 50 °C are particularly well-suited for energy-efficient operation.

2 Intended use of the heat pump

2.1 Intended purpose

The brine-to-water heat pump is to be used exclusively for the heating of heating water. It can be used in new or existing heating systems. A mixture of water and frost protection (brine) is used as a heat transfer medium in the heat source system. Borehole heat exchangers, ground heat collectors or similar systems can be used as the heat source system.

2.2 Operating principle

The heat generated by the sun, wind and rain is stored in the ground. This heat stored in the ground is collected at a low temperature by the brine circulating in the ground heat collector, the borehole heat exchanger or a similar system. A circulating pump then conveys the "heated" brine to the evaporator of the heat pump. There the heat is given off to the refrigerant in the refrigeration circuit. This cools the brine so that it can once again absorb thermal energy in the brine circuit.

The refrigerant is drawn in by the electrically driven compressor, compressed and "pumped" to a higher temperature level. The electrical power needed to run the compressor is not lost in this process. Most of it is absorbed by the refrigerant.

The refrigerant subsequently passes through the liquifier where it transfers its thermal energy to the heating water. Depending on the set operating point, the heating water can thus be heated up to a max. of 62 °C.

3 Basic dev i 40Accessories

The basic device consists of a heat pump for indoor installation wired ready for use with metal casing, switch box and integrated heat pump manager. The refrigeration circuit is "hermetically sealed" and contains the fluorinated refrigerant R410A included in the Kyoto protocol. Information on the GWP value and CO_2 equivalent of the refrigerant can be found in the chapter Device information. The refrigerant is CFC-free, non-ozone depleting and non-combustible.

All components required for the operation of the heat pump are located in the switch box. An outside temperature sensor including fixing accessories and a dirt trap are supplied with the heat pump. The supply for the supply voltage and the control voltage must be installed by the customer.

The circulating pumps (brine and heating water side) included in the scope of supply must be installed in accordance with the hydraulic diagrams (see Cap. 4 on page XX) or the development documents. The electrical connection of the circulating pumps must be established in accordance with Cap. 7.5.3 on page 8.

The customer must provide both the heat source system and the brine circuit manifold.

1) Switch box
2) Evaporator
3) Liquefier
4) Filter dryer
5) Compressor 1
6) Compressor 2
7) Expansion valve
8) Economiser

4.1 Connection flange

The device can optionally be switched to flange connection using the flat-sealing connection flange.

4.2 Remote control

A remote display adds convenience and is available as a special accessory. Operation and menu navigation are identical to those of the heat pump manager. Connection takes place via an interface (special accessories) with RJ 12 Western plug.

ii NOTE

In the case of heating controllers with a removable control panel, this can also be used directly as a remote display.

4.3 Building management system

The heat pump manager can be connected to a building management system network via supplementation of the relevant interface plug-in card. The supplementary installation instructions of the interface card must be consulted regarding the exact connection and parameterisation of the interface.

The following network connections can be made on the heat pump manager:

Modbus
EIB, KNX
Ethernet

CAUTION!

If the heat pump or circulating pumps are controlled externally, a flow rate switch is required to prevent the compressor from being switched on when there is no volume flow.

5 Transport

A lift truck is suited for transporting the unit on a level surface. Carrying straps may be used if the heat pump needs to be transported on an uneven surface or carried up or down stairs. These straps can be passed directly underneath the pallet.

CAUTION!

The heat pump must not be tilted more than 45^ (in any direction).

Use the holes provided in the sides of the frame to lift the unit without the pallet. The side panel assemblies must be removed for this purpose. Any commercially available length of pipe can be used as a carrying aid.

After transportation, the transport fastening in the device is to be removed from both sides of the base.

Technical line drawing of a mechanical assembly with two views (top and side), no visible text or symbols

CAUTION!

Before commissioning, the transport fastening must be removed.

All panelling can be removed to allow accessing the inside of the device.

Loosen the screws for this purpose. The panels can be removed toward the top when slightly tilted.

6 Installation

6.1 General Information

The brine-to-water heat pump must be installed in a frost-free, dry room on an even, smooth and horizontal surface. The entire base of the frame should lie directly on the floor to ensure an adequate soundproof seal. If this is not the case, additional sound insulation measures may be necessary.

The heat pump must be installed so that maintenance work can be carried out without hindrance. This can be ensured by maintaining a clearance of approx. 1 m in front of the heat pump.

Neither frost nor temperatures higher than 35? must occur in the installation location at any time of the year.

ii NOTE

The heat pump is not intended for use over 2000 metres above sea level.

6.2 Acoustic Emissions

The heat pump operates silently due to efficient sound insulation. Internal insulation measures should be carried out to prevent vibrations from being transmitted to the foundation or to the heating system.

7 Installation

7.1 General

The following connections need to be established on the heat pump. The hydraulic integration diagram must be adhered to:

■ Flow and return of the brine (heat source system)
■ Flow and return of the heating system
■ Temperature sensor
Voltage supply

7.2 Connection on the heating side

CAUTION!

Flush the heating system prior to connecting the heat pump.

Before connecting the heating water system to the heat pump, the heating system must be flushed to remove any impurities, residue from sealants, etc. Any accumulation of deposits in the liquifier could cause the heat pump to completely break down.

Once the heat pump has been connected to the heating system, it must be filled, de-aerated and pressure-tested.

CAUTION!

The maximum test pressure in the heating circuit and the brine circuit is 6.0 bar.

This value must not be exceeded.

The following points must be observed when filling the system:

■ Untreated filling water and make-up water must be of drinking water quality.
(colourless, clear, free of sediments)
- Filling water and make-up water must be pre-filtered (max. pore size 5 µm).

Scale formation in domestic hot water heating systems cannot be avoided, but in systems with flow temperatures below 60 °C, the problem can be disregarded. With high-temperature heat pumps and in particular with bivalent systems in the higher performance range (heat pump + boiler combination), flow temperatures of 60 °C and more can be achieved. The following standard values should therefore be adhered to with regard to the filling and make-up water according to VDI 2035, sheet 1: The total hardness values can be found in the table.

Total heat output in kW	Total alkaline earths in mol/m ^3 and/or mmol/l	Specific system volume (VDI 2035) in l/kW
		< 20	≥ 20 < 50	≥ 50
		Total hardness in °dH
< 50 ≤ 2.0	≤ 16.8		≤ 11.2	< 0.11 ^1
50 - 200	≤ 2.0	≤ 11.2	≤ 8.4
200 - 600 ≤ 1.5		≤ 8.4	< 0.11 ^1
> 600	< 0.02	< 0.11 ^1

1. This value lies outside the permissible value for heat exchangers in heat pumps.

Fig. 7.1: Guideline values for filling and make-up water in accordance with VDI 2035

For systems with an above-average specific system volume of 50 l/kW, VDI 2035 recommends using fully demineralized water and a pH stabiliser to minimize the risk of corrosion in the heat pump and the heating system.

CAUTION!

With fully demineralized water, it is important to ensure that the minimum permissible pH value of 7.5 (minimum permissible value for copper) is complied with. Failure to comply with this value can result in the heat pump being destroyed.

Minimum heating water flow rate

The minimum heating water flow rate through the heat pump must be assured in all operating states of the heating system. This can be accomplished, for example, by installing a dual differential pressureless manifold.

The frost protection function of the heat pump manager is active whenever the heat pump manager and the heat circulating pumps are ready for operation. The system must be drained if the heat pump is taken out of service or in the event of a power failure. If heat pump systems are implemented in buildings where a power failure cannot be detected (holiday homes etc.), the heating circuit should be operated with suitable frost protection.

7.3 Heat source connection

The following procedure must be observed when making the connection:

Connect the brine pipe to the heat source flow and return of the heat pump.

The hydraulic integration diagram must be adhered to.

CAUTION!

The supplied dirt trap must be inserted in the heat source inlet of the heat pump to protect the evaporator against the ingress of impurities.

The brine must be produced prior to charging the system. The brine concentration must be at least 25 %. This guarantees frost protection up to approx. -14 °C.

Only monoethylene glycol or propylene glycol-based antifreeze may be used.

The heat source system must be de-aerated and checked for leaks.

CAUTION!

The brine must contain at least a 25 % concentration of a monoethylene glycol or propylene glycol-based antifreeze, which must be mixed before filling.

NOTE

If necessary, the operating range can be extended to a brine inlet temperature of -10 °C. In this case, the minimum brine concentration must be adjusted to 30 %. (Freezing temperature -17 C°).

CAUTION!

The maximum test pressure in the heating circuit and the brine circuit is 6.0 bar. This value must not be exceeded.

CAUTION!

A suitable de-aerator (micro bubble air separator) must be installed in the heat source circuit by the customer.

7.4 Temperature sensor

The following temperature sensors are already installed or must be installed additionally:

■ Outside temperature sensor (R1) supplied (NTC-2)
■ Return temperature secondary circuit (R2) installed (NTC-10)
■ Return temperature primary circuit (R24) installed (NTC-10)
■ Flow temperature secondary circuit (R9) installed (NTC-10)
■ Flow temperature primary circuit (R6) installed (NTC-10)

7.4.1 Sensor characteristic curves

Temperature in °C			-20	-15	-10	-5	0	5	10
NTC-2 in kΩ 14.6 11			4	8.9	7	1	5.6	4	5	3.7
NTC-10 in kΩ			67.7		53.4		42.3		33.9	27.3	22.1	18.0
15	20	25	30		35		40		45	50	55	60
2.9	2.4	2.0	1.7		1.4		1.1		1.0	0.8	0.7	0.6
14.9	12.1	10.0	8.4		7.0		5.9		5.0	4.2	3.6	3.1

The temperature sensors to be connected to the heat pump manager must correspond to the sensor characteristic curve illustrated in Fig. 7.2 on page 6. The only exception is the outside temperature sensor included in the scope of supply of the heat pump (see Fig. 7.3 on page 6)

Fig. 7.2: Sensor characteristic curve NTC-10

Fig. 7.3: Sensor characteristic curve NTC-2 according to DIN 44574 Outside temperature sensor

7.4.2 Mounting the outside temperature sensor

The temperature sensor must be mounted in such a way that all weather conditions are taken into consideration and the measured value is not falsified.

■ Mount on the external wall on the north or north-west side where possible
- Do not install in a "sheltered position" (e.g. in a wall niche or under a balcony)
■ Not in the vicinity of windows, doors, exhaust air vents, external lighting or heat pumps
■ Not to be exposed to direct sunlight at any time of year

Dimensioning parameter sensor lead
Conductor material	Cu
Cable-length	50 m
Ambient temperature	35 °C
Laying system	B2 (DIN VDE 0298-4 / IEC 60364-5-52)
External diameter	4-8 mm

7.4.3 Installing the strap-on sensor

It is only necessary to mount the strap-on sensors if they are included in the scope of supply of the heat pump but have not yet been installed.

The strap-on sensors can be fitted as pipe-mounted sensors or installed in the immersion sleeve of the compact manifold.

Mounting as a pipe-mounted sensor

■ Remove paint, rust and scale from heating pipe.
- Coat the cleaned surface with heat transfer compound (apply sparingly).
- Attach the sensor with a hose clip (tighten firmly, as loose sensors can cause malfunctions) and thermally insulate.

7.4.4 Hydraulic distribution system

The compact manifold and the dual differential pressureless manifold function as an interface between the heat pump, the heating distribution system, the buffer tank and, in some cases, even the domestic hot water cylinder. A compact system is used to simplify the installation process, so that a lot of different components do not have to be installed individually. Further information can be found in the relevant installation instructions.

Compact manifold

The return sensor can remain in the heat pump, or should be installed in the immersion sleeve. The remaining empty space between the sensor and the immersion sleeve must be filled completely with heat transfer compound.

Dual differential pressureless manifold

In order for the heating circuit pumps of the generator and consumer circuits to supply the flow to the return sensor, this must be installed in the immersion sleeve of the dual differential pressureless manifold.

7.5 Electrical connection

7.5.1 General

All electrical installation work must be carried out by a trained electrician or a specialist for the specified tasks in accordance with the

• installation and operating instructions,
  country-specific installation regulations (e.g. VDE 0100),
  ■ technical connection conditions of the energy suppliers and supply grid operators (e.g. TAB) and
  local conditions.

To ensure that the frost protection function of the heat pump works properly, the heat pump manager must remain connected to the power supply and the flow must be maintained through the heat pump at all times.

The switching contacts of the output relay are interference-suppressed. Therefore, depending on the internal resistance of the measuring instrument, a voltage can also be measured when the contacts are open. However, this will be much lower than the line voltage.

Extra-low voltage is connected to controller terminals N1-J1 to N1-J11; N1-J19 to N1-J20; N1-J23 to N1-J26 and the terminal strips X3. If, due to a wiring error, the line voltage is mistakenly connected to these terminals, the heat pump manager will be destroyed.

NOTE

For installation work on the switch box, ensure that the mains cable and signal cables are inserted separately into the switch box. The specially arranged switch box inlets must be used for this purpose (see Fig. 7.4 on page 7).

The mains cables and signal cables must also always be laid separately in the switch box during wiring work.

Fig. 7.4: Cable inlet switch box

7.5.2 Electrical installation work

1) The four-core electrical supply cable for the heat pump power part is fed from the heat pump electricity meter into the heat pump via the utility company blocking contactor (if required) (for supply voltage, see heat pump manual). The mains cable is connected to the heat pump contact plate via terminals X1: L1/L2/L3/PE.

CAUTION!

Ensure that there is a clockwise rotating field: With incorrect wiring the starting of the heat pump is prevented. A corresponding warning is indicated on the display of the heat pump manager (adjust wiring).

An all-pole disconnecting device with a contact gap of at least 3 mm (e.g. utility company blocking contactor or power contactor) and an all-pole circuit breaker with common tripping for all external conductors must be installed in the power supply for the heat pump (tripping current and characteristic in compliance with the device information).

2) The three-core supply cable for the heat pump manager (heating controller N1) is fed into the heat pump. Connection of the control cable to the contact plate of the heat pump via terminal X2: L/N/PE.
The (L/N/PE\~230 V, 50 Hz) supply cable for the heat pump manager must have a continuous voltage. For this reason, it should be tapped upstream from the utility co blocking contactor or be connected to the household current, as important protection functions could otherwise be lost during a utility block.
3) The utility company blocking contactor (K22) with main contacts and an auxiliary contact must be designed and provided by the customer in accordance with the heat pump output.
The NO contact of the utility company blocking contactor is looped from the terminal strip X3/G to the plug-in terminal X3/ID3. CAUTION! Extra-low voltage!
4) The contactor (K20) for the immersion heater (E10) of mono energy systems (HG2) should be dimensioned according to the radiator output and must be supplied by the customer. It is controlled (230 V AC) by the heat pump manager via terminals X2/N and X2/K20.
5) The contactor (K21) for the flange heater (E9) in the domestic hot water cylinder should be dimensioned according to the radiator output and must be supplied by the customer. It is controlled (230 V AC) by the heat pump manager via terminals X2/N and X2/K21.
6) The contactors mentioned above in points 3, 4 and 5 are installed in the electrical distribution system.
7) All installed electric cables must have permanent wiring.

8) The heat circulating pump (M13) is activated via the contact N1-J13/NO5. The connection points for the pump are X2/M13 and X2/N. When using pumps where the switching capacity exceeds the output, a coupling relay must be interposed.
9) The auxiliary circulating pump (M16) is activated via the contact N1-J16/NO9. The connection points for the pump are X2/M16 and X2/N. A coupling relay is already integrated in this output.
10) The domestic hot water circulating pump (M18) is activated via the contact N1-J13/NO6. The connection points for the pump are X2/M18 and X2/N. When using pumps where the switching capacity exceeds the output, a coupling relay must be interposed.
11) The brine or well pump (M11) is activated via the contact N1-J12/NO3. The connection points for the pump are X2/M11 and X2/N. A coupling relay is already integrated in this output.
12) The return sensor (R2) is integrated in the heat pumps for indoor installation. The heat pump manager is connected via the following terminals: X3/GND and X3/R2.
13) The external sensor (R1) is connected to terminals X3/GND and X3/R1.
14) The domestic hot water sensor (R3) is included with the domestic hot water cylinder and is connected to terminals GND and X3/R3.

7.5.3 Connection of electronically regulated circulating pumps

Electronically regulated circulating pumps have high starting currents, which may shorten the service life of the heat pump manager. For this reason, a coupling relay is installed or must be installed between the output of the heat pump manager and the electronically regulated circulating pump. This is not necessary if the permissible operating current of 2 A and a maximum starting current of 12 A are not exceeded in the electronically regulated circulating pump or if express approval has been issued by the pump manufacturer.

CAUTION!

It is not permitted to connect more than one electronically regulated circulating pump via a relay output.

8 Commissioning

8.1 General Information

To ensure that commissioning is performed correctly, it should only be carried out by an after-sales service technician authorised by the manufacturer. This may be a condition for an additional guarantee (see "Warranty service").

8.2 Preparation

The following items must be checked prior to commissioning:

All of the heat pump connections must be installed as described in chapter 7.
The heat source system and the heating circuit must have been filled and checked.
- The dirt trap must be inserted in the brine inlet of the heat pump.
All valves that could impair proper flow in the brine and heating circuits must be open.
The heat pump manager must be adapted to the heating system in accordance with the controller's operating instructions.

8.3 Commissioning procedure

The heat pump is commissioned via the heat pump manager.

CAUTION!

Start-up must be performed in accordance with the installation and operating instructions of the heat pump manager.

9 Cleaning / maintenance

9.1 Maintenance

To prevent faults due to sediment in the heat exchangers, care must be taken to ensure that no impurities can enter either the heat source system or the heating system. In the event that operating malfunctions due to contamination occur nevertheless, the system should be cleaned as described below.

9.2 Cleaning the heating system

The ingress of oxygen into the heating water circuit may result in the formation of oxidation products (rust), particularly if steel components are used. These enter the heating system via the valves, the circulating pumps and/or plastic pipes. A diffusion-resistant installation is therefore essential, especially with regard to the piping of underfloor heating systems.

NOTE

We recommend the installation of a suitable corrosion protection system to prevent the formation of deposits (e.g. rust) in the condenser of the heat pump.

Residue from lubricants and sealants may also contaminate the heating water.

In the event of severe contamination leading to a reduction in the performance of the liquefier in the heat pump, the system must be cleaned by a heating technician.

Based on current information, we recommend using a 5 % phosphoric acid solution for cleaning purposes. However, if cleaning needs to be performed more frequently, a 5 % formic acid solution should be used.

In both cases, the cleaning fluid should be at room temperature. We recommend flushing the heat exchanger in the direction opposite to the normal flow direction.

To prevent acidic cleaning agents from entering the heating system circuit, we recommend connecting the flushing device directly to the flow and return of the liquefier of the heat pump.

It is then important that the system be thoroughly flushed using appropriate neutralising agents to prevent any damage from being caused by cleaning agent residue remaining in the system.

Acids must be used with care and the regulations of the employers liability insurance associations must be adhered to.

The instructions of the cleaning agent manufacturer must always be observed.

9.3 Cleaning the heat source system

CAUTION!

The supplied dirt trap must be inserted in the heat source inlet of the heat pump to protect the evaporator against the ingress of impurities.

The filter sieve of the dirt trap should be cleaned one day after start-up. Further checks must be set according to the level of dirt. If no more signs of contamination are evident, the filter can be removed to reduce pressure drops.

10 Faults / troubleshooting

This heat pump is a quality product and is designed for trouble-free operation. In the event that a fault should occur, it will be indicated on the heat pump manager display. In this case, consult the "Faults and troubleshooting" page in the operating instructions of the heat pump manager.

If you cannot correct the fault yourself, please contact your after-sales service technician.

CAUTION!

Before opening the device, ensure that all circuits are disconnected from the power supply!

After disconnecting the power supply, always wait for at least 5 minutes to allow stored electric charges to dissipate.

CAUTION!

Any work on the heat pump may only be performed by authorised and qualified after-sales service technicians.

11 Decommissioning / disposal

Before removing the heat pump, disconnect it from the power source and close all valves. The heat pump must be dismantled by trained personnel.

All environmentally-relevant requirements regarding the recovery, recycling and disposal of materials and components should be observed in accordance with the applicable standards. Particular attention should be paid to the proper disposal of refrigerants and refrigerant oils.

12 Device information

1 Type and order code			SI 26TU SI 35TU
2 Design
Heat source Brine Brine
2.1 Model Universal Universal
2.2 Controller integrated integrated
2.3 Thermal energy meter Integrated Integrated
2.4 Installation location Indoors
2.5 Performance levels			2	2
3 Operating limits
3.1 Heating water flow ^1 ^2		°C	20 to 62 ± 2	20 to 62 ± 2
3.2 Brine (heat source) ^1 ^2		°C	-5 to +25	-5 to +25
3.3 Antifreeze			Monoethylene glycol	Monoethylene glycol
3.4 Minimum brine concentration (-13 °C freezing temperature)			25 %	25 %
4 Flow / sound
4.1 Heating water flow / free compression (max).
Nominal flow in accordance with EN 14511at B0...-3 / W35...30		m ^3 /h / Pa	4.5 / 69000	6.1 / 50000
at B0...-3 / W45...40		m ^3 /h / Pa	4.4 / 72000	5.7 / 52000
at B0...-3 / W55...47		m ^3 /h / Pa	2.7 / 100000	3.5 / 82000
Minimum heating water flow		m ^3 /h / Pa	2.7 / 100000	3.5 / 82000
4.2 Brine flow rate / free compression (max).
Nominal flow in accordance with EN 14511at B0...-3 / W35...30		m ^3 /h / Pa	6.4 / 31000	8.2 / 64000
at B0...-3 / W45...40		m ^3 /h / Pa	5.6 / 43000	7.3 / 72000
at B0...-3 / W55...47		m ^3 /h / Pa	4.9 / 54000	6.4 / 82000
Minimum brine flow rate		m ^3 /h / Pa	4.9 / 54000	6.4 / 82000
4.3 Sound power level according to EN 12102		dB(A)	57	58
4.4 Sound pressure level at a distance of 1m ^3		dB(A)	41	42
5 Dimensions, weight and filling quantity
5.1 Device dimensions ^4		H x W x L mm	880 x 1000 x 750	880 x 1000 x 750
5.2 Weight of the transportable unit(s) incl. packaging		kg	275	315
5.3 Device connections for heating		inches	G 1 12 " external thread	G 1 12 " external thread
5.4 Device connections for heat source		Inches	G 1 12 " external thread	G 1 12 " external thread
5.5 Refrigerant / total filling weight		type/kg	R410A / 8.4	R410A / 10.9
5.6 GWP value / CO _2 equivalent		--- / t	2088 / 18	2088 / 23
5.7 Refrigeration circuit hermetically sealed			yes	yes
5.8 Lubricant / total filling quantity		type/litres	Polyolester (POE)/2.9	Polyolester (POE)/4.2
5.9 Volume of heating water in device		Litres	7	9
5.10 Volume of heat transfer medium in device		Litres	7	9
6 Electrical connection
6.1 Supply voltage / fuse protection / RCD-Type			3-/PE 400 V (50 Hz) / C 20A / A	3-/PE 400 V (50 Hz) / C 32A / A
6.2 Control voltage / fuse protection / RCD-Type			1-/N/PE 230 V (50 Hz) / C 13A / A	1-/N/PE 230 V (50 Hz) / C 13A / A
6.3 Degree of protection according to EN 60 529			IP 21 IP 21
6.4 Starting current with soft starter		A	23	30
6.5 Nominal power consumption B0 W35 / max. power consumption ^5 kW			5.45 / 10.0	7.25 / 14.5
6.6 Nominal current B0 W35 / cos φ		A / ---	9.83 / 0.8	13.08 / 0.8
6.7 Power consumption of compressor protection(per compressor)		W	70 / thermostatically controlled	70 / thermostatically controlled
6.8 Power consumption of pumps		kW	up to 0.35	up to 0.5

7 Complies with the European safety regulations		6		6
8 Additional model features
8.1 Water in device is protected against freezing 7		Yes Yes
8.2 Max. operating overpressure (heat source/heat sink) bar		3.0		3.0
9 Heat output / COP
9.1 Heat output / coefficient of performance (COP) 5 8		EN 14511 EN 14511
	Performance level 1	2	1	2
at B-5 / W45	kW / ---	11.5 / 3.6	22.5 / 3.5	15.1 / 3.5	9.2 / 3.3
at B0 / W55	kW / ---	12.4 / 3.1	24.7 / 3.1	16.8 / 3.2	32.1 / 3.0
at B0 / W45	kW / ---	13.2 / 4.1	25.4 / 3.8	17.3 / 4.0	33.1 / 3.7
at B0 / W35	kW / ---	13.7 / 5.1	26.7 / 4.9	18.4 / 5.2	34.8 / 4.8

1. If necessary, the operating range can be extended to a brine inlet temperature of -10 °C. In this case, the minimum brine concentration must be adjusted to 30%. (Freezing temperature -17 °C)
   For brine inlet temperatures of -10 °C to -5 °C, flow temperature increasing from 50 °C to 60 °C.
   For brine inlet temperatures of -5 °C to 0°C, flow temperature increasing from 60 °C to 62 °C.
2. Operation is possible at brine inlet temperatures of up to +35 °C. For brine inlet temperatures of +25 °C to 35 °C, flow temperature decreasing from 62 °C to 58 °C.
3. The specified sound pressure level corresponds to the operating noise of the heat pump in heating operation at 55 °C flow temperature. The specified sound pressure level represents the free sound area level. The measured value can deviate by up to 16 dB(A), depending on the installation location.
4. Note that additional space is required for pipe connections, operation and maintenance.
5. These data indicate the size and capacity of the system according to EN 14511. For an analysis of the economic and energy efficiency of the system, the bivalence point and regulation should be taken into consideration. These specifications can only be achieved with clean heat exchangers. Information on maintenance, commissioning and operation can be found in the respective sections of the installation and operating instructions. The specified values, e.g. B0 / W55, have the following meaning: Heat source temperature 0^ and heating water flow temperature 55^ .
6. See CE declaration of conformity
7. The heat circulating pump and the heat pump manager must always be ready for operation.
8. The coefficients of performance are valid with the circulating pumps included in the scope of supply.

13 Product information as per

Regulation (EU) No 813/

2013, Annex II, Table 2

Information requirements for heat pump space heaters and heat pump combination heaters
Model SI 26TU
Air-to-water heat pump no
Water-to-water heat pump no
Brine-to-water heat pump yes
Low-temperature heat pump no
Equipped with a supplementary heater no
Heat pump combination heater no
Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps. For low- temperature heat pumps, parameters shall be declared for low-temperature application.
Parameters shall be declared for average climate conditions:
Item Symbol Value Unit Item Symbol Value Unit
Rated heat output (*) Prated 25 kW			Seasonal space heating energy efficiency ηs 143 %
Declared capacity for heating foer part load at indoor temperature 20°C and outdoor temperature Tj			Declared coefficient of performance or primary energy ratio for part load at indoor temperature 20°C and outdoor temperature Tj
Tj = -7°C Pdh	24,9 kW	Tj = -7°C	COPd 3,22 -
Tj = +2°C Pdh	25,6 kW	Tj = +2°C	COPd 3,74 -
Tj = +7°C Pdh	26,0 kW	Tj = +7°C	COPd 4,13 -
Tj = +12°C Pdh	26,5 kW	Tj = +12°C	COPd 4,60 -
Tj = bivalent temperature Pdh	24,7 kW	Tj = bivalent temperature	COPd 3,09 -
Tj = operation limit temperature Pdh	24,7 kW	Tj = operation limit temperature	COPd 3,09 -
For air-to-water heat pumps			For air-to-water heat pumps:
Tj = -15°C (if TOL < -20°C) Pdh	24,7 kW	Tj = -15°C (if TOL < -20°C)	COPd 3,09 -
Bivalent temperature Tbiv	-10 °C		TOL -10 °C
Cycling interval capacity for heating Pcych	-	kW Cycling interval efficiency	COPcyc -
Degradation co-efficient (**) Cdh	0,90	-	Heating water operating limit temperature WTOL 62 °C
Power consumption in modes other than active mode			Supplementary heater
Off mode POFF	0,015	kW Rated heat output (*)	Psup 0 kW
Thermostat-off mode PTO	0,020	kW Type of energy input	eletrical
Standby mode PSB	0,015	kW
Crankcase heater mode PCK	0,000	kW
Other items			For air-to-water heat pumps: Rated air flow rate, outdoors -			m3/h
Capacity control fixed
Sound power level, indoors/outdoors LWA	57/-	dB	For water-/brine-to-water heat pumps: Rated brine or water flow rate, outdoor heat exchanger -			m3/h
Emissions of nitrogen oxides NOx	-	mg/kWh
For heat pump combination heater:
Declared load profile	-		Water heating energy efficiency ηwh -			%
Daily electricity consumption Qelec	-	kWh	Daily fuel consumption Qfuel -			kWh
Contact details Glen Dimplex Deutschland GmbH, Am Goldenen Feld 18, 95326 Kulmbach
(*) For heat pump space heaters and heat pump combination heaters, the rated output Prated is equal to the design load for heating Pdesignh, and the rated heat output of a supplementary capacity for heating sup(Tj).
(**) If Cdh is not determined by measurement nthen the default degradation is Cdh = 0,9 (-) not applicable
Model SI 35TU
Air-to-water heat pump no
Water-to-water heat pump no
Brine-to-water heat pump yes
Low-temperature heat pump no
Equipped with a supplementary heater no
Heat pump combination heater no
Parameters shall be declared for medium-temperature application, except for low-temperature heat pumps. For low- temperature heat pumps, parameters shall be declared for low-temperature application.
Parameters shall be declared for average climate conditions:
Item Symbol Value Unit Item Symbol Value Unit
Rated heat output (*) Prated 32 kW			Seasonal space heating energy efficiency ηs 140 %
Declared capacity for heating foer part load at indoor temperature 20°C and outdoor temperature Tj			Declared coefficient of performance or primary energy ratio for part load at indoor temperature 20 °C and outdoor temperature Tj
Tj = -7°C Pdh	32,4 kW Tj = -7°C		COPd 3,13 -
Tj = +2°C Pdh	33,3 kW Tj = +2°C		COPd 3,64 -
Tj = +7°C Pdh	33,9 kW Tj = +7°C		COPd 4,03 -
Tj = +12°C Pdh	34,5 kW Tj = +12°C		COPd 4,50 -
Tj = bivalent temperature Pdh	32,1 kW Tj = bivalent temperature		COPd 3,00 -
Tj = operation limit temperature Pdh	32,1 kW Tj = operation limit temperature		COPd 3,00 -
For air-to-water heat pumps			For air-to-water heat pumps: TOL < -20°C) COPd 3,00 -
Tj = -15°C (if TOL < -20°C) Pdh	32,1 kW Tj = -15°C (if TOL < -20°C)		For air-to-water heat pumps: TOL -10 °C
Bivalent temperature Tblv	-10 °C
Cycling interval capacity for heating Pcych	- kW Cycling interval efficiency		COPcyc -
Degradation co-efficient (**) Cdh	0,90 -		Heating water operating limit temperature WTOL 62 °C
Power consumption in modes other than active mode			Supplementary heater heat output (*) Psup 0 kW
Off mode POFF	0,015 kW Rated
Thermostat-off mode PTO	0,020 kW		Type of energy input eletrical
Standby mode PSB	0,015 kW
Crankcase heater mode PCK	0,000 kW
Other items			For air-to-water heat pumps: Rated air flow rate, outdoors - - m³/h
Capacity control fixed
Sound power level, indoors/outdoors LWA NOx	58/- dB mg/kWh		For water-/brine-to-water heat pumps: Rated brine or water flow rate, outdoor heat exchanger - 6,4 m³/h
Emissions of nitrogen oxides
For heat pump combination heater:
Declared load profile	-		Water heating energy efficiency ηwh - %
Daily electricity consumption Qelec	- kWh		Daily fuel consumption Qfuel - kWh
Contact details Glen Dimplex Deutschland GmbH, Am Goldenen Feld 18, 95326 Kulmbach
(*) For heat pump space heaters and heat pump combination heaters, the rated output Prated is equal to the design load for heating Pdesignh, and the rated heat output of a supplementary capacity for heating sup(Tj). (**) If Cdh is not determined by measurement nthen the default degradation is Cdh = 0,9 (-) not applicable

Table des matières

Technical line drawing of an industrial machine with internal components and a close-up view of the base assembly (no text or symbols)

ATTENTION!

6 Installation

Simple line drawing of a rectangular frame with a vertical dimension labeled 750 (no text or symbols beyond the dimension)

2 Diagramme / Diagrams / Diagrammes

2.1 Kennlinien / Characteristic Curves / Courbes caractéristiques SI 26TU

2.2 Kennlinien / Characteristic Curves / Courbes caractéristiques SI 35TU

2.3 Einsatzgrenzendiagramm / Operating limits diagram / Diagramme des seuils d'utilisation

https://glendimplex.de/si26tu

https://glendimplex.de/si35tu

F-67590 Schweighouse Sur Moder

T+33 3 88 07 18 00

F [phone]

[e-mail]

www.dimplex.de/fr

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