Bosch W14B User Manual

Installation and Operating Instructions

Gas Instantaneous Water Heater

Safety instructions:

If you smell gas:

- Do not operate any electrical switches.

- Do not telephone from inside the danger area.

- Turn off the gas cock.

- Open windows and ventilate room.

6 720 607 527 ZA (05.02) JS

- From outside, call the gas company and your approved
installer.

Do not use or store easily combustible materials in the vicinity
of the appliance.

W11..B...
W14..B...
W18..B...

With electronic ignition and triple safety system
consisting of ionisation detector, flue gas monitor
and heat exchanger temperature sensor.

Installation and servicing of the appliance may only be
carried out by an approved technician.

The appliance should be regularly serviced in order to ensure
that it remains in perfect and safe working order.

If there is a risk of freezing, the appliance must be switched
off and drained. If the appliance has not been drained during
a cold spell, when it is switched on again check that it
produces hot water. If problems occur, contact your installer

Contents

W 11 B

23
31

S…

W 14 B

23
31

S…

W 18 B

23
31

S…

1. Technical Characteristics and Dimensions

1.1 General Description ......................................................... 2

1.2 Explanation of Model Code ............................................ 2

1.3 Accessories ........................................................................ 2

1.4 Dimensions ......................................................................... 3

1.5 Appliance design ............................................................... 3

1.6 Circuit diagram ..................................................................4

1.7 Technical characteristics ................................................. 4

2. Preconditions for installation

2.1 Regulations .........................................................................5

2.2 Location .............................................................................. 5

2.3 Fixing the appliance.......................................................... 5

2.4 Water connection ............................................................. 5

1. Technical Characteristics and Dimensions

1.1 General Description

The appliance is easy to operate as it is ready to use at the
press of a button.

2.5 Gas connection ................................................................. 5

2.6 Flue....................................................................................... 5

2.7 Commissioning .................................................................. 5

3. Operation and maintenance

3.1 Function .............................................................................. 6

3.2 Water temperature control .............................................. 6

3.3 Appliance adjustments ..................................................... 6

3.4 Maintenance ...................................................................... 6

3.5 Flue gas safety device ..................................................... 6

3.6 Converting to a different gas type ................................ 6

3.7 Troubleshooting ................................................................. 7

4. Operation .................................................................................. 8

1.2 Explanation of Model Code

Guaranteed safety provided by:

- Gas-tight ionisation detector that prevents escape of gas
if there is no flame.

- Flue gas safety device that switches off the appliance if
the flue is not functioning properly.

- Temperature limiter which protects the heat exchanger
against overheating.

Electronic ignition controlled by opening of water valve.
Absence of a permanent pilot flame make it more
economical than conventional appliances.
Semi-permanent pilot flame functions only during the time
between opening of the water valve and activation of the
main burner.
Heat exchanger has no tin/lead lining.
Automatic water valve made of glass-fibre reinforced
polyamide, 100% recyclable.
Automatic control of water flow maintains constant flow rate
even with fluctuating supply pressure.
Green LED indicates burner condition.

W Gas instantaneous water heater

11 Flow rate (l/min)

B Electronic ignition powered by 1.5 V batteries

23 Natural gas type H

31 LPG (butane/propane)

S... Country code

1.3 Accessories (Included with Appliance)

- Sleeves and hooks for wall-mounting.

- Set of two batteries, 1.5 V type R

2 6 720 607 527

1.5 Dimensions

Dimensions A B C D E F G H (Ø)

(mm) Natural Gas LPG

W11..B...

310 580 228 112,5 463 60 25

W14..B... 350 655 228 132,5 510 95 30
W18..B... 425 655 334 132,5 540 65 30

1/2"

1. Outer case

2. Hole for fixing to wall

3. Observation window

4. Temperature control

5. LED indicator for battery
charge level

6. On/Off switch

7. Output control

8. Gas connection

9. Flue socket

10. Draught diverter with flue
gas monitor

11. Heat exchanger

12. Automatic gas valve

13. Igniter unit

14. Battery compartment

15. LED indicator for burner
status

1.6 Appliance design

Fig. 3

Fig. 2

1. Heat exchanger

2. Ionisation detector

3. Main burner

4. Injector
5a. Testing point for burner pressure
5b. Testing point for supply pressure

6. Slow ignition valve

7. Temperature control

8. Venturi

9. Water valve

10. Flow restrictor

11. Water filter

12. Cold water supply pipe

13. Diaphragm

14. Microswitch

15. Main gas valve

16. Regulating screw

17. Gas inlet

18. Gas filter

19. Battery compartment

20. Hot water pipe

21. Igniter unit

22. On/Off switch

23. LED indicator for battery charge level

24. Servo valve

25. Output control

26. Gas valve

27. Gas valve for pilot burner

28. Pilot burner injector

29. Igniter electrode

30. Pilot burner

31. Temperature limiter

32. Flue gas safety device

33. LED indicator for burner status

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