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UNIT HEATER
Manual Ignition
There is no regular maintenance required on these devices. To change gas control valves, see
Section 7.4.
Pilot Drop Out Test - Manual Ignition Models
During the routine service a check must be made that the flame failure device operates correctly
To do this:-
I) With the pilot flame alight and running for at least 10 minutes, turn off the gas isolating
valve and watch the pilot flame.
II) Measure the time taken from the pilot flame going out until the gas safety valve operates
(can be felt and heard as a dull click). This must be less than 60 seconds.
If the above test fails, replace the thermocouple (see Section 8) with one of the correct type.
Repeat the test to confirm a positive result.
It is not recommended for gas control valves to be repaired or disassembled on site.
Any faulty gas valve should be changed for the correct replacement.
6.4 Gas Control Valves
Automatic Ignition
There is no regular maintenance required on these devices. To change gas control valves, see
Section 7.4.
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