Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
CH Demand
Attach U-gauge to outlet pressure test point on gas valve
CH temperature selector set to Max
CH temperature selector set to Max
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Boiler ON/OFF switch ON.
Allow boiler to ignite and ramp up to its set working pressure and reach a reasonable
operating temperature.
Slowly turn down the CH temperature selector to minimum demand.
Does the burner gas pressure reduce as the boiler temp meets demand?
Notes:
It may be necessary to reduce heating load by turning off some radiators to reduce time taken for this test.
Modulation will not take place if system is satisfied at minimum gas rate.
When U-gauge is removed pressure test point should be tightened & checked for gas tightness.
Allow boiler to ignite and ramp up to its set working pressure and reach a reasonable
operating temperature.
Slowly turn down the CH temperature selector to minimum demand.
Does the burner gas pressure reduce as the boiler temp meets demand?
Notes:
It may be necessary to reduce heating load by turning off some radiators to reduce time taken for this test.
Modulation will not take place if system is satisfied at minimum gas rate.
When U-gauge is removed pressure test point should be tightened & checked for gas tightness.
Isolate as per TOPs P4
and refit as necessary