Bosch Appliances Water Heater W11P User Manual

Installation and Operating Instructions  
Gas Instantaneous Water Heater  
W11..P...  
W14..P...  
W18..P...  
With piezo ignition and double safety  
system consisting of flue gas monitor and  
heat exchanger temperature sensor.  
Safety instructions:  
If you smell gas:  
Installation and servicing of the appliance may only be  
carried out by an approved technician.  
- Do not operate any electrical switches.  
- Do not telephone from inside the danger area.  
- Turn off the gas cock.  
- Open windows and ventilate room.  
- From outside, call the gas company and your approved  
installer.  
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  
Do not use or store easily combustible materials in the vicinity a cold spell, when it is switched on again check that it  
of the appliance. produces hot water. If problems occur, contact your installer.  
 
1.4  
Dimensions  
1. Front cover  
2. Hole for fixing to wall  
3. Observation window  
4. Temperature control  
5. Output control  
6. Gas connection  
7. Exhaust pipe union  
8. Draught diverter with flue gas  
monitor  
9. Heat exchanger  
10. Automatic gas valve  
11. Piezo  
12. Water valve  
Fig. 2  
A
B
C
D
E
F
G
H (Ø)  
Natural Gas  
Dimensions  
(mm)  
W11..P...  
W14..P...  
W18..P...  
LPG  
310  
350  
425  
580  
655  
655  
228 112,5 463  
228 132,5 510  
334 132,5 540  
60  
95  
65  
25  
30  
30  
1/2"  
1.5  
Appliance design  
1. Heat exchanger  
2. Main burner  
3. Injector  
4. Slow ignition valve  
5. Temperature control  
6. Venturi  
7. Water valve  
8. Water throttle  
9. Water filter  
10. Membrane  
11. Cold water pipe  
12. Magnetic valve  
13. Gas supply pipe  
14. Gas filter  
15. Regulating screw  
16. Pilot filter  
17. Piezo  
18. Hot water pipe  
19. Output control  
20. Igniter button  
21. Main gas valve  
22. Gas valve for pilot burner  
23. Pilot burner injector  
24. Gas valve  
25. Jet pressure testing point  
26. Thermocouple  
27. Igniter electrode  
28. Temperature limiter  
29. Flue gas safety device  
Fig. 3  
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1.6  
Technical characteristics  
Technical Data  
Symbol  
Unit  
W11  
W14  
W18  
Pn  
Rated max. heat output  
Rated min. heat output  
Output (modulation range)  
Rated max. heat input  
Rated min. heat input  
Btu/h  
Btu/h  
Btu/h  
Btu/h  
Btu/h  
65570  
31420  
80595  
40300  
104165  
52082  
Pmin  
31420 - 65570 40300 - 80595 52082 - 104165  
Qn  
74450  
36200  
92210  
46105  
117825  
58912  
Qmin  
Supply pressure:  
Natural gas  
mbar (kPa)  
mbar (kPa)  
20 (2.0)  
28 (2.8)  
20 (2.0)  
28 (2.8)  
20 (2.0)  
28 (2.8)  
LPG (butane/propane)  
Consumption:  
m3/h  
kg/h  
Natural gas  
2.2  
1.75  
12  
2.77  
2.2  
14  
3.5  
2.79  
18  
LPG (butane/propane)  
Number of injectors  
pw  
Max. water pressure**  
Temperature control at maximum setting  
Temperature increase  
psi  
170  
170  
170  
°C  
l/min  
psi  
50.0  
5.5  
50.0  
7
50.0  
8.8  
Flow rate  
pwmin  
Min. operating pressure  
Temperature control at minimum setting  
Temperature increase  
2.0  
2.0  
3.0  
°C  
25  
11  
25  
14  
25  
Flow rate  
l/min  
17.6  
Draught requirement  
mbar  
g/s  
0.015  
13  
0.015  
17  
0.015  
22  
Flow rate  
Temperature  
°C  
160  
170  
180  
*
Hi 15°C - 1013 mbar - dry :  
Natural gas  
LPG: Butane 45.7 MJ/kg (12.7 kWh/kg)  
This figure must not be exceeded taking account of water expansion  
34.2 MJ/m3 (9.5 kWh/m3)  
Propane 46.4 MJ/kg (12.9 kWh/kg)  
**  
*** At maximum rated heat output  
4
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Select pipe diameter to suit output of instantaneous water  
heater being installed.  
2.  
Preconditions for installation  
Fit gas service cock as close to appliance as possible.  
The appliance can only be sold in the countries mentioned  
in the type plate.  
Caution: This is a low pressure gas appliance. A SA certified  
2.8 kPa low pressure regulator must be fitted.  
2.1  
Regulations  
Any local by-laws and regulations pertaining to installation  
and use of gas-heated appliances must be observed. Please  
refer to the laws that should be attended in South Africa.  
2.6  
Flue  
It is absolutely essential that all instantaneous water heaters  
are connected to a suitably dimensioned flue pipe by means  
of a gas-tight connection.  
The flue pipe should be made of galvanised iron, aluminium,  
stainless steel or fibre concrete. Fit as shown in Fig. 4.  
A flexible or rigid pipe should be used, fit it inside the flue  
socket. The external diameter of the pipe should be slightly  
smaller than the dimension specified in the appliances  
dimensions table.  
2.2  
Location  
The appliance should be sited in a well ventilated room where  
it will not be exposed to temperatures below freezing.  
To prevent corrosion, the combustion air must not contain  
any corrosive substances. Substances classed as corrosion-  
promoting include halogenated hydrocarbons such as are  
found in solvents, paints, adhesives, aerosol propellants and  
various household cleaners. Appropriate measures should  
be taken where necessary.  
wind/rain  
protection  
With the exception of the flue pipe, the surface temperature  
of the appliance is below 85 °C. No special safety measures  
are therefore necessary.  
Site appliance as shown in Fig. 4.  
Always site appliance in a location not exposed to  
temperatures below freezing. If this is not possible, the  
appliance must be switched off and drained whenever there  
is a risk of freezing.  
Danger: the appliances are designed to prevent flame reflow.  
In case you suspect anything unusual in the appliance  
operation, please shut down gas and water cocks, and call  
an approved technician to check the local conditions.  
To prevent flame reflow in outdoor installations please make  
sure that a wind/rain protection is fitted.  
To prevent flame reflow in indoor installations please make  
sure that a wind/rain protection is fitted at the end of the  
secondary flue.  
2.3  
Fixing the appliance  
Remove the temperature control and the output control.  
Remove the outer case by sliding it forwards and then lifting  
upwards.  
Fix the appliance using the sleeves and hooks supplied so  
that it is vertical.  
Never allow the appliance to rest against water or gas  
pipes.  
Fig. 4  
2.7  
Commissioning  
Turn on the gas and water cocks and check all connections  
for leaks.  
Check flue gas safety device good functioning, proceed as  
explained in section 3.5.  
2.4  
Water connection  
It is advisable to drain the appliance before installing it as  
any dirt or grit inside it could reduce the water flow rate and,  
in extreme cases, could completely clog up the appliance.  
Mark hot water and cold water pipes so as to prevent  
confusion.  
Connect pipe to automatic water valve using the connecting  
kit supplied.  
To prevent problems caused by sudden pressure fluctuations  
in the water supply, it is advisable to fit a non-return valve to  
the water outlet.  
2.5  
Gas connection  
Take care to ensure dirt is not allowed to enter gas inlet.  
Make sure that the type of gas specified on the appliance  
type plate is the same as that supplied by the gas authorities.  
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The overhaul should involve thoroughly cleaning the heat  
exchanger, burner, pilot burner and automatic water valve  
filter.  
If necessary, the inside of the heat exchanger and the  
connecting pipes should be descaled.  
Check the gas and water valves for leaks and carry out a  
complete function check.  
3.  
Operation and maintenance  
Sealed parts must not be interfered with.  
3.1 Function  
This water heater is fitted with piezo ignition that provides  
for easy commissioning.  
If components need to be replaced, use only genuine Bosch  
spare parts.  
In first place it must dislocate the output control of the off  
position to the ignition position (see fig. 5).  
Press in the slide control knob and subsequently press the  
piezo button. Release the slide control after about 15  
seconds, if the pilot flame does not stay alight, repeat the  
operation.  
Ignition may not be successful due to the presence of air  
inside the gas supply pipe, especially if first connected or  
after long inactive periods. In this case, keep the output  
control knob fully depressed until the gas pipe has been  
totally purged.  
3.5  
Flue gas safety device  
The recommition must be done from a qualified technician  
only.  
The flue gas safety device must not under any circumstances  
be switched off, simulated or replaced by any other  
component.  
Operation and safety precautions  
The flue gas safety device checks the effectiveness of flue  
gas extraction by the flue. If it is inadequate, the appliance  
switches off automatically so that the combustion fumes do  
not escape into the room in which the appliance has been  
installed. The flue gas safety device resets after a cooling-  
down period.  
If the appliance shuts down while in operation, ventilate the  
room. Wait about 10 minutes then restart the appliance. If  
the problem recurs, call an engineer. The user must never  
make any modifications to the appliance.  
Slide the gas control slide fully to the right to obtain maximum  
output. Sliding the gas control slide to the left reduces the  
output.  
In order to optimise energy consumption, adjust the output  
control to supply the minimum output required.  
After following these procedures, ignition of the main burner  
will automatically take place whenever you turn on a hot  
water tap, since the pilot burner is permanently alight.  
When you want to switch off the heater, move the slide  
control to the far left. After a few seconds the pilot flame  
will go out.  
Maintenance  
If faults occur on the flue gas safety device, proceed as  
follows:  
- Undo flue gas safety device fixing screw.  
If there is a risk of freezing, switch off the appliance and  
drain the appliance.  
Danger: the area in front of the burner can reach very high - Undo magnetic unit connector  
temperatures, and there is a risk of burning on contact.  
- Remove thermocouple.  
Replace damaged component with new one and refit using  
the reverse of the procedure set out in the table above.  
3.2 Water temperature control  
The water temperature control is used to adjust the water  
flow rate, and thereby the water temperature, to the desired  
setting.  
Turning the control clockwise reduces the water flow rate  
and increases the temperature; turning the control anti-  
clockwise increases the water flow rate and reduces the  
temperature.  
If the temperature is set only as high as required, energy  
consumption is reduced and the likelihood of scale deposits  
in the heat exchanger minimised.  
Function check*  
Flue gas safety device function check:  
- Disconnect flue pipe  
- Replace with pipe (about 50 cm long) with sealed end  
- Fit pipe vertically  
- Start up appliance at rated output and set temperature  
control to maximum temperature.  
Under those conditions, the appliance should shut down  
after two minutes. Remove temporary pipe and reconnect  
flue pipe.  
* This work may only be carried out by an approved engineer.  
3.3  
Appliance adjustments  
All instantaneous water heaters are factory-adjusted and  
require no further adjustment.*  
Water heaters that use LPG (liquefied petroleum gas, i.e.  
butane/propane) are set to the operating pressure stated  
on the identification plate (2,8 kPa).  
3.6  
Converting to a different gas type  
Use only the genuine Bosch conversion kit. Conversion  
may only be carried out by an approved technician.  
Natural gas appliances are set to a Wobbe Index of 15 kWh/  
m3 and a supply pressure of 2.0 kPa.  
* Sealed components must not be tampered with.  
3.4  
Maintenance  
The appliance should only be serviced by an approved  
engineer.  
A complete overhaul should be carried out after two years.  
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3.7  
Troubleshooting  
Installation, servicing and repairs may only be carried out by an approved engineer.  
The following table illustrates only a few solutions to straightforward problems.  
Problem  
Cause  
Solution  
Pilot flame stay alight.  
Blocked pilot burner.  
Clean.*  
Several atempts required to turn pilot  
flame on.  
Yellow pilot flame.  
Flame goes out while appliance is in  
operation.  
Flue gas safety device has tripped  
Temperature limiter has tripped.  
Ventilate room. Wait 10 minutes then restart  
appliance. If problem recurs, call an approved  
technician.  
Wait 10 minutes then restart appliance. If  
problem recurs, call an approved technician.  
Water not hot enough.  
Check output selector position and regulate  
according with needs.  
Water not hot enough, weak flame.  
Gas supply dynamic pressure too low.  
Check gas cylinder governor and replace if  
incompatible or damaged. *  
Check whether gas cylinder (butane) is  
freezing when appliance is in operation and re-  
site in warmer location if necessary.  
Reduced water flow rate.  
Inadequate inlet flow rate.  
Check and adjust.  
Check and clean.  
Dirt in water service cock or mixer unit.  
Automatic water valve clogged.  
Heat exchanger clogged (scale).  
Clean filter.*  
Clean and descale as necessary.*  
The operations marked with “*” may only be carried out by an approved technician  
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4.  
Operation  
Turn on all gas and water taps  
Purge air from pipes  
Ignition:  
Depress slide control knob  
and hold it in  
Release the slide control knob  
after approximately 15 seconds  
Press the piezo igniter  
Repeat these steps if the flame does not stay alight  
Output Control:  
output decrease  
output increase  
Temperature adjustment  
Turning control anti-clockwise  
Turning control clockwise  
increases water flow rate and  
reduces water temperature  
reduces water flow rate and  
increases water temperature  
Switching off:  
Move slide control to the far left  
Fig. 5  
 

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