281 Issue 1 - Service Manual - BX3
26
Gas Valve Servicing (cont)
Low Inlet pressures
It is possible that low inlet pressure can cause:
•
Unreliable ignition if the inlet pressure is below 0.80 kPa at the time of ignition.
•
Underrated heat output
•
Burner Pressure Measurement
1. Loosen the burner pressure test point screw, on the gas valve in the location
shown in the diagram, and connect a suitable manometer immediately.
2. Turn on the heater and wait for the flame proving period to finish.
3. Check the burner gas pressure and if it requires adjusting please follow the below
steps.
4. Unscrew the pressure regulator adjustment cap.
5. There is a adjustment screw under the cap which will adjust the burner pressure.
6. Clockwise will increase the gas pressure.
7. Anticlockwise will decrease the gas pressure.
8. The table below shows the gas pressure for each unit.
9. Turn the unit off and remove the manometer and unscrew the test point and re-
screw the cap back into its place.
10. Please ensure there is no leaks on each of the pressure tap screw.
Note:
Please use an approved sealant.
For gas pressure please refer to technical information sheet.
