Operating instructions

18 6 720 607 160
Fig. 22
Before commissioning the appliance, the gas installation
must be purged and tested for gas soundness in accordance
with BS 6891.
13.1) Ensure the gas isolation valve is turned off.
13.2) Remove the appliance outer case.
13.3) To increase access to the pressure test point, the
control box may be temporarily repositioned, depress the
two curved finger tab latches on top of the control box
and withdraw forward. Use the integral moulded hooks
to hang the control from the combustion box (Fig. 22).
13.4) Loosen screw (pos. 4) and connect a pressure gauge
to the test point. Replace the control box and outer case.
13.5) Turn on the gas isolation valve.
13.6) Move main switch to position I (On). Set the
temperature control knob to Maximum. Fully open any
hot water tap.
Note: On initial light up, or after prolonged shut down,
the establishment of a flame may take several attempts
due to the presence of air in the gas supply pipe.
13.7) Check the dynamic inlet gas pressure is 20.0 mbar.
If the pressure is not correct then check the gas supply
to the appliance.
If the pressure is correct, turn off the hot water tap and
move the main switch to the off position. Remove the
outer case and reposition the control box as in 13.3.
Turn off the gas isolation valve. Remove the pressure
gauge and tighten screw (pos. 4).
13.8) The burner pressure is factory set and should not
require adjustment.
To confirm the burner pressure stated in table 1, loosen
screw (pos 1) and connect a pressure gauge to the
pressure test point. Replace the control box and outer
case, turn on the gas isolation valve.
With the main switch in position O (off), on the control
box front turn the temperature control to position 60.
Press and hold the burner indicator button (Fig. 3, key
13). Move the main switch to position I (on), the green
burner indicator blinks. Fully open a hot tap, confirm the
burner pressure, turn the main switch to position O (off).
Turn off the hot water tap, close the gas isolation valve.
Remove the case and pressure gauge, tighten screw
(pos 1). Replace controls and outer case.
13.9) Should the burner pressure require adjustment, refer
to section 15.5, Service Adjustment.
13.10) Open gas Isolation Valve, fit the fascia and set the
Main Switch to I (on), the appliance is now ready for
operation.
13.11) On completion of the commissioning and testing of
the system, the installer should:
13.11.1) Give the Instructions to the user for safe
keeping.
13.11.2) Explain and demonstrate the lighting and
shutdown procedures.
13.11.3) Advise the user of the precautions necessary to
prevent damage to the system and to the building in the
event of the system remaining inoperative during frost
conditions.
13.11.4) Recommend that the appliance is serviced
annually for reasons of safety and economy and that the
servicing must be carried out by a competent person.
13. Commissioning
1 Burner pressure measuring point
2 Minimum gas flow ajustment screw
3 Maximum gas flow adjuster
4 Gas supply pressure measuring point