Set Appliance State:
Gas Off
| Isolate Mains Power to appliance as per TOPs P4 |
Turn Hot Water Tap On
Slacken the lower test point screw of the Gas Valve and attach a U-gauge to the test point
Selector switch to DHW position
CH temperature selector to minimum
DHW temperature selector to maximum
Selector switch to DHW position
CH temperature selector to minimum
DHW temperature selector to maximum
Gas On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow fan to start and ignition sequence to run.
Observe U-gauge. During the sparking phase the inlet pressure should drop slightly (by 1 or 2 mbar) then stabilise and remain constant at approximately 20 mbar.
Note: When U-gauge is removed the test point should be tightened and checked for gas soundness.
Observe U-gauge. During the sparking phase the inlet pressure should drop slightly (by 1 or 2 mbar) then stabilise and remain constant at approximately 20 mbar.
Note: When U-gauge is removed the test point should be tightened and checked for gas soundness.
Isolate as per TOPs P4
and refit as necessary