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
Disconnect tube running from gas valve to combustion chamber
Attach pressure gauge to gas valve pressure outlet test point
Disconnect tube running from gas valve to combustion chamber
Attach pressure gauge to gas valve pressure outlet test point
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Allow self-check to complete then boiler to ignite and establish.
Adjust screw "F" on the modureg adjuster, clockwise to increase the
pressure setting, anticlockwise to decrease the pressure setting.
Note:
1. When checking minimum gas pressure, burner may not always cross light, rectify.
2. When pressure gauge is removed the pressure test point should be tightened and checked for gas tightness.
MINIMUM ADJUSTED - RECHECK MAXIMUM AND CONTINUE DIAGNOSIS
UNABLE TO ADJUST MINIMUM BURNER PRESSURE CORRECTLY
Adjust screw "F" on the modureg adjuster, clockwise to increase the
pressure setting, anticlockwise to decrease the pressure setting.
Note:
1. When checking minimum gas pressure, burner may not always cross light, rectify.
2. When pressure gauge is removed the pressure test point should be tightened and checked for gas tightness.
MINIMUM ADJUSTED - RECHECK MAXIMUM AND CONTINUE DIAGNOSIS
UNABLE TO ADJUST MINIMUM BURNER PRESSURE CORRECTLY
