Sterling TUBULAR GAS FIRED DIRECT SPARK PROPELLER UNIT HEATERS GG-30 - Manual (Page 34)

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1. Check for proper orifi ce size. Refer to “Operation”.
2. Test and reset manifold pressure.
1. Replace orifi ce.
2. Test and reset manifold pressure.
1. Clean main burner ports.
2. Align manifold assembly.
3. Clean combustion air inlet openings.
4. Check gas input and manifold pressures.
1. Clean Flue. Refer to “Installation”.
2. Clean combustion air inlet openings.
3. Clean heat exchanger. Refer to “Installation”.
4. Determine cause and repair accordingly.
1. Inspect all gas piping and repair.
2. Check to ensure gas test ports are seated.
3. Clean heat exchanger/fl ue.
4. Clean fl ue collector.
5.
See “Installation”.
1. Check grounding wires and spark bracket
connections.
2. Inspect spark cable connections and cuts.
3. Check to ensure spark is energized after
pre purge period.
4. Test and reset manifold pressure refer to
“Operations”.
5. Clean or replace orifi ce.
6.
Refer to “Installation”.
1. Open all manual valves “check for leaks”.
2. Turn on power supply, check fuses and
replace if bad.
3. Turn up thermostat, Check for 24v on
terminals R and W1 on terminal strip.
4. Check switch for continuity if open with no
heat present, replace.
5. Check switch operation to ensure
switch closes after draftor purge period.
If it does not make/check tubing
connections/blockage.
6. Check all wiring per diagram.
7. Check all ground wires and connections.
8. Check both, for wiring according to diagram.
9.
Replace ignitor.
10. Resecure ignitor bracket.
11. Check for 24V at gas valve terminals during
trial for ignition period. If present with no
manifold pressure. Replace valve.
12. Refer to symptom “Q”.
1. Refer to “Installation, Venting”.
2. Check gas supply pressures to unit. Refer
to “Installation”.
3. Refer to “Installation”.
1. Burner orifi ce incorrect.
2. Low manifold Pressure.
1. Irregular orifi ce causing whistle or resonance.
2. Excessive gas input.
1. Clogged burner.
2. Misaligned orifi ce.
3. Insuffi cient combustion air.
4. Possibly over fi red.
1. Blocked venting.
2. Insuffi cient combustion air.
3. Blocked heat exchanger.
4. Air leak into combustion chamber, fl ue
collector or draft hood.
1. Gas pipe leak.
2. Leaking gas test port on valve.
3. Blocked heat exchanger.
4. Blocked draft hood.
5. Negative pressure in the building.
1. Improper ground.
2. Bad or broken spark cable.
3.
Faulty control.
4. Manifold pressure set too low.
5. Main burner orifi ce dirty.
6.
Improper venting.
1. Gas supply is off.
2. No power supply to unit.
3. Thermostat not calling.
4. Defective high limit.
5. Defective drafter prove switch.
6. Loose wiring.
7. Improper ground.
8. Improper thermostat or transformer wiring.
9.
Ignitor defective/damaged.
10. Misaligned ignitor.
11. Defective gas valve.
12. Blown fuse.
1. Improper venting.
2. Unit under fi red.
3. Building too cold.
Table 9 - Tubular Propeller Troubleshooting Guide
A. Flame pops back.
B. Noisy Flame.
C. Yellow tip fl ame (some yellow
tipping on LP gas is permissible).
D. Floating fl ame.
E.
Gas odor.
Shut off gas supply immediately!
F. Delayed ignition.
G. Failure to ignite.
H. Condensation.
SYMPTOMS POSSIBLE CAUSE(S) CORRECTIVE ACTION