ADJUSTMENT PRESSURE MAX AND 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
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

Mains Power On

Observation:

1. MINIMUM BURNER PRESSURE

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.
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
Betacom 24 C Max - Min	12.5 - 2.5 mb	36.5 - 8.0 mb
Betacom 30 C Max - Min	14.0 - 2.3 mb	36.0 - 6.0 mb

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.

Nut "E"

Screw "F"