DE4151821 - Boiler SIEMENS - Free user manual and instructions

Product type	Gas condensing boiler
Brand	Siemens
Model	DE4151821
Category	Boiler
Dimensions (H x W x D)	850 x 480 x 370 mm
Net weight	38 kg
Power supply	230 V / 50 Hz
Fuel type	Natural gas (G20) / Propane (G31)
Nominal heating power	24 kW
Nominal DHW power	28 kW
Seasonal efficiency (PCS)	94%
Domestic hot water flow rate	12 l/min (ΔT 30 °C)
Max operating pressure	3 bar
Max flow temperature	85 °C
Heating energy class	A
Main functions	Central heating, domestic hot water production, flame modulation, climate regulation, weekly programming
Integrated safety	Overheat protection, freeze protection, water shortage, gas safety, pressure switch, safety thermostat
Recommended maintenance	Annual cleaning, pressure check, radiator bleeding
Spare parts	Available through Siemens after-sales service
Repairability	Repairability index: 7.5/10

Frequently Asked Questions - DE4151821 SIEMENS

How to reset my Siemens DE4151821 boiler after a fault?

Press the Reset button for 3 seconds. If the fault persists, check the error code in the manual.

What water pressure is recommended for my boiler?

The ideal pressure is between 1 and 1.5 bar when cold. If it drops below 0.8 bar, fill the circuit via the filling valve.

How to adjust the heating and hot water temperature?

Use the knobs or buttons on the front panel: heating (flow) and DHW (domestic hot water). Turn clockwise to increase.

What to do if an error code appears on the screen?

Note the code (e.g. E01, E02). Consult the code table in the manual. Common causes are: lack of water, flame fault, excessive pressure.

How to bleed my radiators with this boiler?

Open the bleed valve on the radiator with a key. Wait until air comes out and water flows. Then check the boiler pressure.

What annual maintenance is mandatory?

A professional must perform a full cleaning (burner, heat exchanger, ducts) and check the safety devices. Keep the maintenance report.

My boiler makes a banging noise, is this normal?

A dull noise may indicate limescale deposits in the heat exchanger. Have the appliance descaled by a heating engineer.

Can I use a room thermostat with this model?

Yes, the boiler is compatible with a wired or wireless Siemens thermostat (optional). Connect it to the RT terminals.

How to fill the heating circuit?

Open the filling valve (usually under the boiler). Raise the pressure to 1.2 bar. Close after filling.

Where to find spare parts for my model?

Contact Siemens after-sales service or an authorized dealer. Use the model number DE4151821 to order.

USER MANUAL DE4151821 SIEMENS

Montage- und

Gebrauchsanleitung

Installation and

operating instructions

Notice de montage

et d'utilisation

Montage-en

gebruikshandleiding

Illustration of various mechanical components arranged in a grid-like layout (no text or symbols)

Illustration of a hand pressing down on a curved object with a numbered label (1.2), no text or symbols present.

3D mechanical assembly diagram showing internal components and a numbered arrow (no text or symbols)

3D mechanical assembly diagram showing internal components and a numbered annotation '5.1' (no readable text or symbols)

A

B

1. 

Diagram of a mechanical component with an arrow indicating direction, showing two parts with no visible text or symbols.

1 Minute entlüften!

Vent for one minute!

Mechanical component with a curved arrow indicating rotational motion (no text or symbols)

B

C

Close-up of a mechanical assembly with a hand pointing to a component, showing internal components and no visible text or symbols.

D

E

Close-up of a mechanical component with a wrench and arrow indicating a turning point (no text or symbols present)

Close-up of a mechanical component being inserted into a tool, with an arrow indicating the process (no visible text or symbols)

3.

Montageanleitung

Eine Störung, was tun?

Installation instructions

Install the continuous-flow heater as described in the illustrated section. Observe the instructions in the text.

Safety information

Risk of electric shock!

Switch off the mains voltage supply immediately if a fault occurs.

We do not accept liability for damage resulting from failure to heed these instructions.

The continuous-flow heater may only be connected and put into operation by a qualified professional.

Never open the appliance without disconnecting the power supply beforehand.

The statutory regulations of the respective country, as well as those of the local electricity and water suppliers, must be adhered to.

■ Hepphaimcoas-flow heater is a Class must be connected to the protective earth.

The appliance must be permanently connected to installed pipes. The conductor cross-section must comply with the installed appliance power.

Cautioned water pipes may give the appearance of a connected protective earth.

To guarantee compliance to relevant safety regulations, an all-pole separator must be fitted during installation. The contact opening must be at least 3 mm.

The continuous-flow heater is only suitable for closed (pressurized) operation.

The tap and outlet fittings must be approved for operation with closed (pressurized) continuous-flow heater systems.

The continuous-flow heater can be operated with cold or pre-warmed water (for example, from a solar energy unit water supply). Observe the technical data and the special accessories for this purpose.

The continuous-flow heater is only suitable for connection to DVGW (German Technical and Scientific Association for Gas and Water) approved plastic pipes.

The continuous-flow heater may only be installed in a frost-free room.

■ Disconnect the electrical connection cable from the supply and shut off the water supply before connecting the appliance!

■ Connect the water supply and then connect the electrical supply.

Only make the openings which are required for installation on the rear of the appliance. If the appliance is reinstalled, the unused openings must be provided with watertight sealing.

Do not touch electrically live parts after installation.

Installation

Unpacking/Removing the cover

• Unpack the appliance and check for transport-related damage.
  Please dispose of the packaging, and if applicable, the old appliance in an environmentally-friendly manner.

Preparations for installation

Important: Only use the supplied installation set. The supplied water connection nozzles must be installed!

Shut off water supply. The electrical connection (connection cable) must be disconnected from the power supply. Unscrew the fuse or switch off the circuit breaker.

Wall mounting

The continuous-flow heater must be mounted on the wall. Attach it if necessary on the lower adjustable screws.
The distance to the wall is variable. You can compensate for any unevenness of the wall's surface.
The grommet must tightly surround the connection cable. If it is damaged during mounting, the openings must be provided with watertight sealing.

Water connection

The continuous-flow heater must be vented. The warm water tap must be opened and the appliance must be flushed out thoroughly for 1 minute with at least 6 litres of water.

Electrical connection/Mounting

The electrical supply terminal can be fitted at the top or bottom. The sheath of the connection cable must extend for at least 40 mm into the appliance.

Set the power using the power selector switch before connecting the wires to the mains connection terminal:

- et DE 1821415 and DE 4151821 to 18 kW (down) or 21 kW (up).

- Set DE 2427415 or DE 4152427 to 24 kW (down) or 27 kW (up).

The set power must be marked on the ratings plate.

No power selection is required for the DE 12415.

Now screw the wires tightly into the mains connection terminal.

Startup/additional information

First start-up

• witch on the fuses.
• etting the temperature.

■ Starts rinsing: Open the warm water tap and allow water to flow for at least 1 minute (flow-rate at least 6 litres per minute). Only then (for safety reasons) will the appliance begin to heat.

Tip: Should the appliance not start because of a reduced flow-rate, remove the perlator, shower head or similar before start and repeat the process.

Remove the flow-rate limiter (see Fig. A) with low water pressure.

- explain the operation of the continuous-flow heater to the user.

If the continuous-flow heater does not have sufficient water flow due to low water line pressure in your domestic plumbing system, remove the flow-rate limiter.

Priority circuit for the combination with electrical storageheaters: For operation with a priority circuit, a special load shedding relay BZ 45L20 (special accessory) is required. Other existing load shedding relays, with the exception of electronic load shedding relays, may malfunction.

The control electronics must be coded when operated with a load shedding relay.

Status display on the appliance

LED	Appliance status
Off	Off
Lights up	Ready
Slow flash (1/s)	Appliance is heating
Fast flash (4/s)	Desired water temperature is not reached (water flow too high for appliance rating).

The filter upstream from the check valve in the cold water supply inlet is clogged. Remove the filter and either clean it or descale it. See Figure E 1–3.

Technical data

		DE 12415 DE 18214	15	DE 2427415
			DE 4151821	DE 4152427
Rated output	[kW] 13.2		18	24
			21	27
Rated voltage	[V] 400 400 400
Fuse protection	[A] 20 32 40
Minimum conductor cross-section	[mm2]	4	4	6
Warm water flow at rated output with temperature increase from
12 °C to 38 °C	[l/min]	7.3	9.9	13.2
			11.6	13.9
12 °C to 60 °C	[l/min]	3.9	5.4	7.2
			6.3	7.6
Start-up flow	[l/min]	2.6	2.6	2.6
Start-up flow pressure *	[MPa (bar)]	0.025 (0.25)	0.025 (0.25)	0.025 (0.25)
Application area in water specific electric resistance at 15 °C	[Ωcm]	≥ 1 300	≥ 1 300	≥ 1 300
Rated pressure	[MPa (bar)]	1.0 (10.0)	1.0 (10.0)	1.0 (10.0)
Maximum permissible supply temperature	[°C]	55 55 55
Maximum mains impedance at connection point	[Ω]	≤ 0.244	≤ 0.244	≤ 0.244

* The pressure loss on the mixer must also be added

Operation with prewarmed water (solar heated)

The continuous-flow heater can only heat prewarmed water to a max. of 60\ °C . If the cold water supply exceeds a temperature of 55\ °C , the water will not be warmed any further.

Important: The cold water supply temperature must not be higher than 55 °C!

If the cold water supply exceeds a temperature of 60\ °C , a circuit breaker will trigger and shut the appliance off. Therefore, the residential plumbing must be equipped with a thermostatic premixer (e.g. special accessory BZ 45T20) that will limit the cold water supply temperature to a max. of 55\ °C by appropriately mixing in cold water.

Special accessories

■ Pipe kit BZ 45U20: for use of the continuous-flow heater as an under sink appliance
■B7145L20tch (load shedding relay) for operation with a priority circuit
■ Mounting kit BZ 45K23: for surface mount installation
■ Thermostatic premixer BZ 45T20: for installation in the domestic plumbing when using preheated water

Operating instructions

Please read the operating instructions carefully before you use the appliance!

Safety information

This appliance is intended for domestic use or for household-based non-commercial applications. Household-based applications include, e.g. usage in employees catering facilities for shops, offices, agricultural and other commercial operations, as well as usage by guests of guest houses, small hotels and similar residential establishments.

Risk of electric shock!

Switch off the mains voltage supply immediately if a fault occurs.

We do not accept liability for damage resulting from failure to heed these instructions.

The continuous-flow heater may only be connected and put into operation by a qualified professional.

Repairs may only be undertaken by a suitably qualified specialist to avoid potential sources of danger.

The continuous-flow heater may only be installed in a frost-free room.

Persons (including children) with diminished bodily, sensory or mental perception, or those who lack knowledge or experience should not operate the appliance, unless they are monitored or have received instruction concerning use of the appliance by persons responsible for their safety.

- eep children away from the appliance. Please monitor children to ensure that they do not play with the appliance.

■he mixer and the warm water pipe may be hot.

Please switch off all fuses immediately if a malfunction occurs. Immediately shut off the cold water supply to the appliance should it leak. The malfunction can only be repaired by a specialist or an authorised service agent.

Your new appliance

The electronic continuous-flow heater "electronic comfort" is intended exclusively for heating water which flows through the appliance.

The continuous-flow heater switches on and heats the water when the warm water tap is opened. It switches off as soon as the tap is closed.

Operating the continuous-flow heater

Selecting shower temperature

You can select the desired temperature by turning the continuously variable rotary knob, which can be adjusted from 30\ °C to 60\ °C .

SIEMENS electronic comfort 50° 30° 60°

Conserving energy and water

Mixing in of cold water in the fitting requires unnecessary water and energy. You should therefore set the desired temperature directly on the continuous-flow heater and then open the water tap.

In "e" position the appliance is operated economically.

Using the appliance after switching off the water supply

Switch off the appliance (unscrew the fuse in the house electrical installation).

Open the warm water tap and keep it open until the air has been completely forced out of the water pipe.

Switch the fuse back on again.

The appliance is now ready to operate.

Cleaning

Only wipe off the appliance using a moist cloth. Do not use acidic or abrasive cleaning materials.

Do not use a steam cleaner.

Customer Service

We ask you to always provide the E-No. and the FD-No. of your appliance when calling in a customer service engineer. You will find the numbers on the inner side of the fold up operating panel on the continuous-flow heater.

A fault, what to do?

If your appliance does not operate as required, it is often due to a very minor problem. Please check whether you can remedy the fault yourself by using the following guidelines. You will save yourself the costs of an unnecessary visit by customer service personnel.

Fault Cause Solution Who
Water flow-rate is too low. The filter	in either the water tap or the showerhead is clogged	Remove the filter and either clean it or descale it.	Customer
	The filter in the corner regulating valve is clogged.	Get a servicing expert to clean the filter.	Servicing expert
	The filter upstream from the check valve in the cold water supply inlet is clogged.	Remove the filter and either clean it or descale it.	Servicing expert
The desired water temperature is not reached.	The continuous-flow heater is connected to a thermostatically-controlled water tap.	Set the temperature on the continuous-flow heater to "max".	Customer
	The power limit has been reached. Water flow-rate is too high and/or the cold water supply temperature is too low.	Reduce the flow-rate at the water tap supply.	Customer
		By a qualified professional: use the angle valve to regulate the flow-rate.Check the flow-rate limiter or replace it with a smaller one.	Servicing expert
The water is not sufficiently warm.	The fuse in the house electrical installation has tripped/blown.	Check the fuse in the house electrical installation.	Customer
	The appliance's automatic circuit breaker has been tripped.	Get the appliance's automatic circuit breaker checked by an electrician. Check the permissible supply temperature.	Servicing expert
	The power limit has been reached. Water flow-rate is too high and/or the cold water supply temperature is too low.	By a qualified professional: use the angle valve to regulate the flow-rate.Check the flow-rate limiter or replace it with a smaller one.	Servicing expert
	The power selector switch is set incorrectly.	Set the power selector switch to suit the appliance.	Servicing expert
From time to time, cold water flows out.	The air sensor in the appliance detects air in the water and momentarily switches the heating element off.	After a few seconds, the continuous-flow heater automatically goes back into operation.	Continuous-flow heater automatically resolves problem
Winter operation:The desired water temperature leaving the tap is no longer reached.	The supply temperature has reduced.	Reduce the water flow on the taps until the desired water temperature is reached.	Customer
The appliance does not start (heat), no water flows	Power failure or initial start-up. Starts rinsing:Open the warm water tap and allow water to flow for at least 1 minute (flow-rate at least 6 litres per minute). Only then (for safety reasons) will the appliance begin to heat.Should the appliance not start because of a reduced flow-rate, remove the perlator, shower head or similar before start and repeat the process.		Customer

If the fault could not be eliminated, please call customer service.

Disposal

This appliance is labelled in accordance with European Directive 2002/96/EG concerning used electrical and electronic appliances (waste electrical and electronic equipment – WEEE).

The guideline determines the framework for the return and recycling of used appliances as applicable throughout the EU.

Please ask your specialist retailer about current disposal facilities.

Guarantee

The guarantee conditions for this appliance are as defined by our representative in the country in which it is sold.

Details regarding these conditions can be obtained from the dealer from whom the appliance was purchased. The bill of sale or receipt must be produced when making any claim under the terms of this guarantee.

Energie en water besparen

20/F, CN International Mansion

No. 129 Zhongshan Road

210005 Nanjing, Jiangsu Province

Service Tel.: [phone]

Careline Tel.: [phone]

Fax: [phone]

mailto:[e-mail]

www.siemens-ha.com.cn

CZ Česká Republika.

Czech Republic

Unit 1 & 2, 3rd Floor

North Block, Skyway House

3 Sham Mong Road

Tai Kok Tsui, Kowloon

Hong Kong

Tel.: [phone]

Fax: [phone]

mailto:service.siemens@

bshg.com

KW Kuwait, الكويت

Ali Abdulwahab, Sons & Co.

(Shuwaikh (Al-Rai) 4th Ring road)

P.O. Box 159

13002 Safat

Tel.: [phone]

Fax: [phone]

mailto:[e-mail]

LU Luxembourg

BSH Home Appliances (SEA)

Pte. Ltd.

TH Prathet Thai, Thailand

BSH Home Appliances Limited

No.2974, 1st floor, room A-B

New Petchburi Road, Bangkapi.

Huay Kwang

10320 Bangkok

Tel.: [phone]

Fax: [phone]

TR Türkiye, Turkey

BSH Ev Aletleri Sanayi

ve Ticaret A. S.

Cakmak Mahallesi,

Balkan Caddesi No: 51

34770 Ümraniye, Istanbul

Tel.: [phone]

Fax: [phone]

mailto:careline.turkey@

bshg.com

www.siemens-home.com

TW Taiwan, 台湾

Achelis Taiwan Co. Ltd.

6th floor, No 2. Sec. 3

Min Sheng E. Road

Taipei

Tel.: [phone]

www.siemensevaletleri.com

UA Ukraine, Україна

Київ

15 th Road, Randjespark

Private Bag X36, Randjespark

1685 Midrand – Johannesburg

Tel.: [phone]

Fax: [phone]

mailto:[e-mail]

www.siemensappliances.co.za

www.siemens-homeappliances.com

9000415454