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23.6 A44 Amplifier - Field Service Checklist
SYMPTOM
A.
No gas fl ow.
B.
Continuous low fi re (electronics ok).
C.
Continuous Low Fire (electronics problem)
D.
Incorrect Low Fire
E.
Continuous Minimum Discharge Air Temperature
F.
Incorrect Max. or Min. Discharge Air Temperature.
G.
Continuous High Fire (electronics ok)
H.
Continuous High Fire. (electronics problem)
I.
Incorrect High Fire
J.
Continuous Maximum Discharge Air Temperature
K.
Burned out Transformer. No Voltage to Amplifi er
L.
Incorrect Space Temperature.
*Control circuits external to the Series 44 can cause burner malfunction. Always check manual valve to be certain gas is on, and check limit contro
for normal operation.
POSSIBLE CAUSE
1. Valve improperly installed.
2. Open circuit in modulator coil.
3. Plunger missing, jammed or improperly installed.
4. Ruptured main or balancing diaphragm.
5. No voltage to the amplifi er.
6. Short in modulator coil circuit.
7. Short in TS144 circuit.
8. Faulty amplifi er.
9. Incorrect by-pass metering valve adjustment.
10. Excessive negative burner pressure.
11. Faulty amplifi er.
12. Short in T244 or TS244/TD244 circuit
13. Incorrect space temperature calibration.
14. Improper TS144 location.
15. Incorrect discharge air temperature calibrations
16. Foreign material holding valve open.
17. Plunger jammed.
18. Open circuit in TS144
19. Inlet pressure too low.
20. Incorrect outlet pressure adjustment.
21. Faulty amplifi er.
22. Open circuit in T244 to TS244/TD244
23. Incorrect space temperature calibration.
24. Short in modulator coil circuit.
25. Incorrect maximum discharge air temperature
setting (A1044).
26. Incorrect minimum discharge air temperature
setting (A1044).
27. Insufficient burner capacity.
28. Incorrect space temperature calibration.
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