Service manual

G.Fire Service Manual 20 Issue A — © Masport, March 2004

3. SERVICE ADJUSTMENTS

3.1 GAS PRESSURE ADJUSTMENT — CARDRONA and MONACO S2

All pressure adjustments must be made while the heater is operating.

Part or all of the right hand side panel of the cabinet may be removed to gain access to the gas

valve. See ACCESS POINTS on page 11.

GAS PRESSURES ECS II ACC STD

kPa

NG ULPG PROP NG ULPG PROP NG ULPG PROP

High Pressure 0.9 2.0 2.0 0.85 2.2 2.2 0.85 2.2 2.2

Turndown Pressure 0.35 0.5 0.5 0.43 1.36 1.36 0.23 0.7 0.7

3.1.1 STD MODELS. These have a pressure regulator separate from the control valve. Set the pressure

to the figures in the Table. The pressure test point is on the side of the regulator and the adjusting

screw is on the top.

1. Slacken the lock-nut and rotate the screw by hand, screwing in to increase the pressure.

2. After adjusting, tighten the lock nut and confirm the correct pressure.

Use the

pressure test point on the

valve

to check the turndown

pressure. It is adjusted by turning

the small screw on the valve.

3.1.2 ACC MODELS. These have a pressure regulator inside the control valve. There are two test

points side by side on top of the control valve – the outlet pressure test point is the one closer to the

flame size control.

If adjustment is necessary, uncouple the

control rod from the top of the flame size

control knob on the valve, extract the screw

down the

centre of this knob and pull the

knob off vertically.

The high pressure is then set by rotating the

knurled plastic wheel exposed by removing

the knob.

Once the pressure is correct (see Table),

care must be taken not to turn the plastic

wheel when the knob is re-fitted in its

maximum anti-clockwise position. This

position is set when the skirt of the knob

contacts the adjacent metal up-stand.

After re-fitting, rotate the knob clockwise

and then fully anti-clockwise to verify that

the pressure is correct before replacing the

retaining screw and re-coupling the control

rod.

5. The turndown pressure is not independently adjustable. It should approximate the values shown in

the Table.