Service manual

G.Fire Service Manual 9 Issue A — © Masport, March 2004

— THERMOSTAT HEATERS. ERRATIC OPERATION

ROOM TEMPERATURE FLUCTUATES TOO WIDELY

Ensure that the wall thermostat or the temperature sensor in the hand unit is exposed to free-flowing

room air but not in draughts or too close to windows.

HEATER CYCLES ON AND OFF TOO FREQUENTLY

— NO FLAME MODULATION ON ECS II MODELS.

These models are controlled by an RF hand-held remote. The remote control has the capability of

modulating the flame (turning the flame height up and down).

ECS II MODELS:

The flame modulation is selected by the user when operating in the MA

UAL mode, while it is

automatically ad

usted when in the AUTO and PROGRAM modes. To verify correct modulation, select

the MA

UAL mode and step the flame height through all of its six settings by pressing the '+' and '–'

buttons as appropriate. The modulating voltage should be checked only while the modulating coil on the

valve is connected to the control box. Ease the connectors at the top of the modulating coil part way off

and measure the voltage at the exposed lower part of the terminals. The normal voltage range is

approximately 3 volts to 11.5 volts dc. (These voltages apply to ECS I models also). If the measured

voltages are correct and the flame is not modulating, then the valve is probably faulty. A faulty

modulating coil winding will result in a false voltage reading at the coil.

— SOOTING.

If you encounter sooting inside the glass, check the following

items:-

• Verify that the gas pressure is correct.

• Verify that the correct sizes of jets are fitted (see Tables 2,

3).

• Increase the primary air intake, if necessary, by opening the rotary sleeve on the main burner

(adjacent to the main jet).

OTE. Avoid making ad

ustments when burning the final dregs of gas in an LPG bottle as these

can be very 'dirty'.

Move the hand unit or the wall thermostat further away from the heater, ensuring that it is exposed to

free-flowing room air but not in draughts or near windows. A powerful heater in a relatively small room

will cycle frequently unless its heat output is reduced by turning down the flame height setting.