PRESSURE GAS VALVE - ADJUSTMENT MAX & MIN

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

WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure

Mains Power On

Observation:

1. MINIMUM BURNER PRESSURE

Allow boiler to ignite and establish.

Adjust screw "F" on the modureg adjuster, clockwise to increase the
pressure setting, anticlockwise to decrease the pressure setting.
2. MAXIMUM BURNER PRESSURE

Isolate Mains Power to appliance as per TOP's P4

Reconnect lead to gas valve modureg coil.

Mains power ON

Allow boiler to ignite and establish.

(Ensure that screw "F" is held in position), adjust nut "E" on the modureg adjuster, clockwise
to increase the pressure setting, anticlockwise to decrease the pressure setting.

Modureg lead

Appliance	Natural Gas - G20	LPG - G30/G31
S24 Compact Max - Min	12.7 - 1.6 Mbar	27.8 - 3.2 Mbar
S30 Compact Max - Min	15.0 - 1.7 Mbar	27.8 - 3.2 Mbar

Table 1

Note: 1. When checking minimum gas pressure, burner may not always cross light, rectify.

Nut "E"

Screw "F"

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.