Heating Service Troubleshooting - Bryant DuraPac 580F Series Installation, Start-Up And Service Instructions Manual

PROBLEM
Burners Will Not Misaligned spark electrodes.
Ignite.
No gas at main burners.
Water in gas line.
No power to furnace.
No 24 v power supply to control circuit.
Miswired or loose connections.
Burned-out heat anticipator in thermostat.
Broken thermostat wires.
Inadequate Heating. Dirty air filter.
Gas input to unit too low.
Unit undersized for application.
Restricted airflow.
Blower speed too low.
Limit switch cycles main burners.
Too much outdoor air.
Poor Flame Incomplete combustion (lack of
Characteristics. combustion air) results in:
Aldehyde odors, CO, sooting flame, or floating
flame.
Burners Will Not Unit is locked into Heating mode for a
Turn Off. one minute minimum.
Table 40 — Heating Service Troubleshooting
CAUSE
Check flame ignition and sensor electrode positioning.
Adjust as needed.
Check gas line for air purge as necessary. After purging
gas line of air, allow gas to dissipate for at least 5 min-
utes before attempting to relight unit.
Check gas valve.
Drain water and install drip leg to trap water.
Check power supply, fuses, wiring, and circuit breaker.
Check transformer. Transformers with internal overcurrent
protection require a cool down period before resetting.
Check all wiring and wirenut connections.
Replace thermostat.
Run continuity check. Replace wires, if necessary.
Clean or replace filter as necessary.
Check gas pressure at manifold. Clock gas meter for input. If too
low, increase manifold pressure, or replace with correct orifices.
Replace with proper unit or add additional unit.
Clean filter, replace filter, or remove any restrictions.
Use high speed tap, increase fan speed, or install
optional blower, as suitable for individual units.
Check rotation of blower, thermostat heat anticipator settings,
and temperature rise of unit. Adjust as needed.
Adjust minimum position.
Check economizer operation.
Check all screws around flue outlets and burner
compartment. Tighten as necessary.
Cracked heat exchanger.
Overfired unit — reduce input, change orifices, or adjust
gas line or manifold pressure.
Check vent for restriction. Clean as necessary.
Check orifice to burner alignment.
Wait until mandatory one minute time period has
elapsed or power to unit.
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REMEDY