Set Appliance State:
CH Demand
Isolate Mains Power to appliance as per TOPs P4
Selector switch to heating and hot water position
CH temperature selector to MAX
DHW temperature selector to MIN
Attach U-gauge to gas valve outlet pressure test point
Selector switch to heating and hot water position
CH temperature selector to MAX
DHW temperature selector to MIN
Attach U-gauge to gas valve outlet pressure test point
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Allow boiler to fire and run. After approximately 90 seconds,
burner pressure should increase to its set pressure.
Slowly turn the CH temperature selector (1) anti-clockwise.
As the temperature demand is satisfied, does the burner pressure reduce to its minimum setting?
Notes:
If CH burner pressure has been set at its minimum rate, then modulation will not take place.
When the U-gauge is removed, ensure the pressure test point is checked for soundness.
burner pressure should increase to its set pressure.
Slowly turn the CH temperature selector (1) anti-clockwise.
As the temperature demand is satisfied, does the burner pressure reduce to its minimum setting?
Notes:
If CH burner pressure has been set at its minimum rate, then modulation will not take place.
When the U-gauge is removed, ensure the pressure test point is checked for soundness.
Isolate as per TOPs P4
and refit as necessary