Set Appliance State:
Gas Off
Turn Hot Water Tap On
Isolate Mains Power to appliance as per TOPs P4
Selector switch in OFF position
CH temperature selector to minimum
DHW temperature selector to maximum
Attach U-gauge to gas valve inlet pressure test point
Gas ON
Selector switch in OFF position
CH temperature selector to minimum
DHW temperature selector to maximum
Attach U-gauge to gas valve inlet pressure test point
Gas ON
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Turn selector switch to hot water position and allow boiler to begin running while observing the U-gauge.
Does the U-gauge show a constant inlet pressure of at least 18mb throughout the ignition sequence?
When U-gauge is removed, ensure pressure test point is checked for soundness.
Does the U-gauge show a constant inlet pressure of at least 18mb throughout the ignition sequence?
When U-gauge is removed, ensure pressure test point is checked for soundness.
Isolate as per TOPs P4
and refit as necessary