Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
CH Demand
CH selector to Max
Set FGA to Pressure
Connect FGA to differential pressure test points
Summer/Winter Selector to Winter
Set FGA to Pressure
Connect FGA to differential pressure test points
Summer/Winter Selector to Winter
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Press reset to cancel purge cycle countdown.
Allow burner to ignite and burner pressure and CH temp to increase gradually. At approximately 60 degrees slowly reduce the temperature setting with the CH control knob.
Does the burner pressure reduce as the demand for heat is reduced?
Notes:
1. Modulation will not take place if the system is hot and the boiler has already reduced to low rate.
2. When FGA is removed the pressure test point cap should be refitted and checked for gas tightness.
Allow burner to ignite and burner pressure and CH temp to increase gradually. At approximately 60 degrees slowly reduce the temperature setting with the CH control knob.
Does the burner pressure reduce as the demand for heat is reduced?
Notes:
1. Modulation will not take place if the system is hot and the boiler has already reduced to low rate.
2. When FGA is removed the pressure test point cap should be refitted and checked for gas tightness.
Isolate as per TOPs P4
and refit as necessary