Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
CH Demand
CH temperature control to maximum
DHW temperature control to minimum
CH temperature control to maximum
DHW temperature control to minimum
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 anti-clockwise.
As the temperature demand is satisfied, does the burner pressure
reduce to its minimum setting?
Notes:
1. If CH burner pressure has been set at its minimum rate,
then modulation will not take place.
2. When pressure gauge is removed the pressure test point
should be tightened and checked for gas tightness.
After approximately 90 seconds, burner pressure should increase
to its set pressure.
Slowly turn the CH temperature selector anti-clockwise.
As the temperature demand is satisfied, does the burner pressure
reduce to its minimum setting?
Notes:
1. If CH burner pressure has been set at its minimum rate,
then modulation will not take place.
2. When pressure gauge is removed the pressure test point
should be tightened and checked for gas tightness.
Isolate as per TOPs P4
and refit as necessary