Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
DHW demand from programmer
DHW temperature selector to high setting
Ensure hot water storage vessel is calling for heat
DHW temperature selector to high setting
Ensure hot water storage vessel is calling for heat
Attach F.G.A unit to fan pressure test point
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Reset boiler if required.
Allow ignition sequence to start.
With the fan running the pressure measured will read negative and should be approximately -1.5 mbar or greater (e.g. -2.5 mbar) see Note 1.
Note:
1. During the ignition sequence the fan speed will increase & decrease, as will the fan pressure, but fan pressure should not be seen to drop below -1.5 mbar (e.g. -0.5 mbar).
2. Boiler may go to lockout during test, reset as required until test complete.
3. When pressure gauge is removed pressure point cap should be replaced.
Allow ignition sequence to start.
With the fan running the pressure measured will read negative and should be approximately -1.5 mbar or greater (e.g. -2.5 mbar) see Note 1.
Note:
1. During the ignition sequence the fan speed will increase & decrease, as will the fan pressure, but fan pressure should not be seen to drop below -1.5 mbar (e.g. -0.5 mbar).
2. Boiler may go to lockout during test, reset as required until test complete.
3. When pressure gauge is removed pressure point cap should be replaced.
Isolate as per TOPs P4
and refit as necessary