IX. SEQUENCE OF OPERATION
IX.
(TYPICAL)
A. Room Thermostat Calls for Heat (Winter
Mode):
1. Magnetic fan motor starter coil is ener-
gized.
2. Revolving discharge motor is energized
(when furnished).
3. As each power venter proves airflow the
spark ignition module is energized.
B. Room Thermostat Satisfied:
Entire unit is de-energized resulting in shut
down of diaphragm gas valves, fan motor,
and revolving discharge motor (when fur-
nished).
C. The Summer-OFF-Winter Switch allows
operation of the fan unit without firing the
duct furnaces (Summer Mode).
X. TROUBLE SHOOTING
A. Refer to attached furnace manual for Trouble
Shooting instructions regarding power venter,
pilot burner, and main burner.
B. If fan motor fails to operate:
1. Check the magnetic starter and reset if
tripped.
2. Check room thermostat.
3. Check Summer-OFF-Winter switch if
used.
4. Manually energize starter.
5. If the motor is found defective after all
checks are made, repair or replace.
C. If the revolving discharge (if used) fails to
rotate when the fan unit is operating:
1. Check the fuse in the revolving discharge
motor splice box.
2. Check for free movement of the dis-
charge rotation, pull the drive wheel away
from discharge collar before rotating.
3. While drive wheel is away from dis-
charge, check for shaft slippage.
4. Observe if the revolving discharge motor
drive wheel rotates.
5. Test for 110 voltage in the junction box
on revolving discharge motor. If motor still
fails to operate, replace the motor.
4
4830 Transport Drive
Dallas, TX 75247
Tel. (214) 638-6010
Fax (214) 905-0806
