Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Turn Hot Water Tap On
Disconnect one lead from the gas valve modureg coil
Attach pressure gauge to gas valve pressure outlet test point
Attach pressure gauge to gas valve pressure outlet test point
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
1. MINIMUM BURNER PRESSURE
Allow boiler to ignite and establish.
Minimum burner pressure measured should be as per table 1.
2. MAXIMUM BURNER PRESSURE
Reconnect lead to gas valve modureg coil.
Mains power ON.
Allow boiler to ignite and establish.
Maximum burner pressure measured should be as per table 1.
Note:
1. When checking minimum gas pressure, burner may not always cross light, rectify.
2. Ensure a sufficient DHW flow rate to prevent boiler from modulating the burner pressure.
3. When pressure gauge is removed the pressure test point should be tightened and checked for gas tightness.
2. MAXIMUM BURNER PRESSURE
| Isolate Mains Power to appliance as per TOP's P4 |
Note:
1. When checking minimum gas pressure, burner may not always cross light, rectify.
2. Ensure a sufficient DHW flow rate to prevent boiler from modulating the burner pressure.
3. 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