Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
CH Demand
Attach pressure gauge to fan pressure test point
Gas On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow boiler to ignite and the CH system to reach a reasonable operating temperature. Turn down the CH temperature selector to minimum demand.
Does the fan pressure reduce as the boiler temperature meets demand?
Notes:
1. The pressure measured will be negative.
2. Modulation will not take place if system is satisfied at minimum gas rate.
3. When pressure gauge is removed pressure point cap should be refitted.
Does the fan pressure reduce as the boiler temperature meets demand?
Notes:
1. The pressure measured will be negative.
2. Modulation will not take place if system is satisfied at minimum gas rate.
3. When pressure gauge is removed pressure point cap should be refitted.
Isolate as per TOPs P4
and refit as necessary