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UNIT HEATER
Section 7. REMOVAL AND REPLACEMENT OF PARTS
See warnings and notes at the start of Section 6 before removing or replacing parts.
7.1 Burner Tray
The burner tray may be removed from the heater only from the front.
It may be removed complete with the gas valve train assembly or on its own leaving the gas valves in
the heater.
These instructions indicate how to remove the burner tray and valves separately.
7.1.1
Remove the front lower cabinet panel. Remove the rear lower cabinet panel.
7.1.2
Dependant on the heater size and if it is manual or automatic ignition the main valve will be connected
to the main burner inlet manifold using a navy union or the angled flange outlet of the valve.
The pilot gas supply will be in 4mm OD steel pipe and be connected to the pilot gas valve or pilot port
of the main gas valve using a suitable compression fitting.
Undo the pilot supply compression fitting
Automatic Ignition
Unplug the flame probe lead from its socket and the HT lead from the spark generator.
Manual ignition
Unscrew the thermocouple from its connection with the gas valve and pull off the leads to the
thermocouple interrupter relay from their receptacles.
Disconnect the main burner gas supply pipe at the union or gas valve flange
7.1.3
Unscrew the two screws securing the burner tray at the front, (Fig.7. 1 ) and pull out the tray forwards
from the front of the heater.
7.1.4
To replace the tray reverse the above steps ensuring that the tray is firmly in its correct place with the
two fixing screws tight and that the gas pipe work is sound.
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