User`s manual

19
Once the water heater installation has been completed, it is nec-
essary to commision the appliance as follows:
Gas supply installation
Inspect the entire installation including the meter, test for sound-
n
ess and purge, as described in BS 6891.
C
hecking electricity supply
Carry out preliminary checks for earth continuity, polarity, resist-
ance to earth and short circuit.
L
eave the appliance with the front cover fitted and the mains elec-
trical supply isolated.
Lighting the boiler
Ensure that the gas and water service valves below the appliance
are open;
Ensure that the gas supply is properly purged as BS 6891;
Open a hot water tap and ensure that all air is purged from the
appliance and the pipes;
Switch on the mains electrical supply, and turn the appliance on
at the On/Off switch;
Turn on a hot water tap;
The appliance will attempt to ignite, should this fail due to air in
the gas pipe, the appliance will lock-out, it will be neccessary to
reset the appliance as explained in Section 2.3 (page 4).
Setting the gas pressures
Connect a manometer to the test nipple on the gas section (1,
Fig. 25) and check for adequate standing pressure.
Turn on the hot water tap nearest to the water heater and ensure
that the working pressure is that shown in Table A.
Once the working pressure has been established, check that the
burner pressure is that indicated in Table A.
To check the burner pressure, it is necessary to connect a
manometer to the test nipple (2. Fig. 26), should the burner pres-
sure require adjusting, use the screw (3, Fig. 27) to adjust, turn
clockwise to increase the pressure and anti-clockwise to
decrease the pressure.
NOTE:THIS APPLIANCE IS NOT SUITABLE FOR CONVERTING FROM ONE
GAS GROUP TO ANOTHER, IT IS RECOMMENDED THAT THE CORRECT WATER
HEATER BE ORDERED TO MATCH THE TYPE OF GAS BEING USED.
5. Comissioning
Fig. 25
Working Pressure
Natural
20 mbar
Burner Pressure
Natural
12.7 mbar
TABLE A
Fig. 26
Fig. 27