281 Issue 1 - Service Manual - BX3
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6.0 MAIN COMPONENTS SERVICING
This section contains the procedures for checking and adjusting (if necessary) main components
of the heater. This may be required due to a failure or a routine service.
6.1 Gas Valve Servicing
The diagram below indicates the measurement and adjustment locations. If adjustment to the
gas valve is required, remove the cap screw and adjust via the pressure regulator adjustment
screw.
VR8215S
Direct ignition combination
gas controls
Gas valve checking and adjustment (only if required). To check for correct gas valve settings and
operation the following should be performed, and adjustments made when necessary.
Inlet Pressure Measurement
•
Remove the gas inlet tap and replace with a pressure test point.
•
Connect a suitable manometer to the test point.
•
Turn on the heater and wait for the flame proving period to finish.
•
Check that the inlet gas pressure is between 1.1 kPa to 3.5 kPa. Pressures below this
level can result in insufficient gas pressure for combustion. If this is the case then this
situation should be rectified.
•
Remove the manometer and remove the test point.
•
Replace the gas inlet tap and test for gas leakage.
Note: Please use an approved sealant.
