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immediately extinguish and the heater should hard lockout at which time the PIM burner control
should provide 3 flash indication and the touchscreen should provide 'Ignition Error' fault indication.
13. Open the gas isolation valve then press and release the heater's red 'RESET' button. The heater
should relight after the pre-purge period.
14. Test operation of the auto reset high limit switch as follows:
a)
With the burner operating, disconnect one wire from the auto reset high limit switch (spade
terminals are provided externally of and adjacent to the high limit switch); the burner must
extinguish and the touchscreen should provide 'Auto High Limit, Auto Limit Error' fault
indication.
b)
Reconnect the wire then press and release the heater's red 'RESET' button. The heater
should relight after the pre-purge period.
15. Check operation of the blocked flue pressure switch as follows:
a)
Disconnect one wire from the rear of the blocked flue pressure switch; the burner must
extinguish and the touchscreen should provide 'Blocked Vent' fault indication.
b)
Reconnect the wire then press and release the heater's red 'RESET' button. The heater
should relight after the pre-purge period.
16. Conduct a combustion analysis test.
17. Warn customer of the danger of storing chemicals and/or using flammable materials or aerosol
spray packs near the heater. Aerosols and harsh chemicals can also cause premature failure of
heater components.
Annual Service
1.
Conduct the Six Monthly Service Procedure detailed above PLUS;
2.
Remove and check hot surface igniter. Check for cracks or damage, check resistance (refer to
Service Manual TM080) and replace if necessary.
3.
Remove and clean flame sensor. Check for cracks or damage and replace if necessary.
4.
Remove and clean burner using compressed air (refer to component replacement procedure 41 in
Service Manual TM080).
Five Year Service
1. Conduct the Annual Service Procedure detailed above PLUS;
2. Replace Temperature & Pressure relief valve.
DO NOT return the heater to service if any test procedure fails, if any test/check
result is outside specifications indicated or if an unsafe condition exists.
Air Intake Filter Replacement
A dirty or blocked air intake filter will cause a decrease in blower vacuum pressure. The blower
vacuum pressure is measured at the blower manifold pressure test point and should be:
-1.02 kPa ± 0.05 kPa for NG models and
-1.07 kPa ± 0.05 kPa for P models.
A lower vacuum pressure reading can indicate a blocked air filter which must be checked and
replaced if blocked
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