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Why does my heater not operate and my unit does not attempt to light (no visible spark)?
Direct Fired Makeup Air Heaters
a) Your power may not be passing through the heating inlet air sensor (TS1). Adjust heating inlet air sensor (TS1). b) Your power may not be passing through the high limit (HLC1). Reset or replace your high limit (HLC1). c) The power may not be passing through the airflow switch. Correct the airflow across the burner by adjusting airflow switch (PS2).
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Why does my heater not operate when my unit attempts to light with no flame (visible spark)?
Direct Fired Makeup Air Heaters
a) Your low fire may not be set properly. Adjust low fire setting (See direct gas operation in OIPM). b) The gas pressure between the min and max shown on the direct gas label may be incorrect. Correct the gas pressure (See direct gas operation in OIPM). c) There may be air in the gas line. Purge the gas line. d) The burner pressure drop across the burner may need to be adjusted. Adjust burner baffles (See direct gas operation in the OIPM). e) The spark may not be set properly. Uncross crossed flame and spark wires and reconnect. Reset spark plug gap to 0.062 inches. Replace defective spark plug.
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Why is my blower not operating?
Direct Fired Makeup Air Heaters
a) The 24 Vac on the secondary of the main transformer (TR1) may not be working. Measure across A1-A2 on supply blower contractor. Check Main voltage - see blower Operation. Turn Main Disconnect (DS1) On if Off. Replace defective Main Transformer TR1. b) The Supply Starter (ST1) may not be energized. Reset tripped Supply Fan Overload (ST1 OL). Restore 1 or more missing legs of 3 phase. Replace defective Supply Starter c) The fan belt may be broken. Replace belt. d) The motor or capacitor may be defective. Repair or replace.
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Why is my makeup heater so noisy?
Direct Fired Makeup Air Heaters
a) The belts may be worn or loose. Replace worn belts or tighten loose belts. b) The sheaves may not be properly aligned. Align sheaves. c) The wheel may be unbalanced. Clean excess debris from wheel or replace if necessary. d) The bearings may be worn or defective. Replace bearings. e) The wheel may be rubbing on the inlet. Adjust wheel or inlet.
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