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•
Circulator blower is energized on high heat speed
following a fixed five second blower on delay. Electronic
air cleaner terminals are energized with circulator
blower.
•
Furnace operates; integrated control module monitors
safety circuits continuously.
•
R and W thermostat contacts open, completing the call
for heat.
•
Gas valve closes, extinguishing flame.
•
Induced draft blower is de-energized following a thirty
second post purge.
•
HUM terminal is de-energized.
•
Circulator blower continues running for selected heat
off delay period factory set at 150 seconds. If required
this can be changed in the field.
•
Electronic air cleaner is de-energized.
•
Furnace awaits the next call from thermostat.
Cooling Mode
The normal operational sequence in cooling mode is as
follows:
•
R, Y and G thermostat contacts close, initiating a call
for cool.
•
Integrated control module performs safety circuit
checks.
•
Outdoor fan and compressor are energized.
•
Circulator blower is energized on cool speed following
a fixed six second on delay. If required this can be
changed in the field too 45 seconds. Electronic air
cleaner terminals are energized with circulator blower.
•
Furnace circulator blower and outdoor cooling unit
run, integrated control module monitors safety circuits
continuously.
•
R, Y and G thermostat contacts open, completing the
call for cool.
•
Outdoor fan and compressor are de-energized.
•
Circulator blower is de-energized following a fixed forty
five second cool off delay period. Electronic air cleaner
terminals are de-energized.
•
Furnace awaits the next call from thermostat.
Fan Only Mode
The normal operational sequence in fan only mode is as
follows:
•
R and G thermostat contacts close, initiating a call for
fan.
•
Integrated control module performs safety circuit
checks.
•
Circulator blower is energized on low heat speed.
Electronic air cleaner terminals are energized.
•
Circulator blower runs, integrated control module
monitors safety circuits continuously.
•
R and G thermostat contacts open, completing the call
for fan.
•
Circulator blower is de-energized. Electronic air cleaner
terminals are de-energized.
•
Furnace awaits the next call from thermostat.
Start-up Procedure And Adjustment
Furnace must have a
connected and grounded. Proper polarity must be maintained
for correct operation. An interlock switch prevents furnace
oper ation if the blower door is not in place. Keep the blower
access door in place except for inspection and maintenance.
This furnace is also equipped with a self-diagnosing electronic
control module. In the event a furnace component is not
operating properly, the control module LED will flash on
and off in a factory-programmed sequence, depending on
the problem encountered. This light can be viewed through
the observation window in the blower access door. Refer to
the Troubleshooting Chart for further explanation of the fault
codes.
Furnace operation
Purge gas lines of air prior to start-up. Do not purge lines into
an enclosed burner compartment. Follow NFPA 54, National
Fuel Gas Code 8.1 for proper purging methods.
Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector, or
other approved method.
NOTE: An interlock switch prevents furnace oper ation if the
blower door is not in place. Keep the blower access doors in
place except for inspection and maintenance.
Furnace Start-up
1. Close the manual gas shutoff valve external to the
furnace.
2. Turn off the electrical power to the furnace.
3. Set the room thermostat to the lowest possible setting.
4. Remove the burner compartment door.
NOTE: This furnace is equipped with an ignition device which
automatically lights the burner. Do not try to light the burner
by hand.
5. White-Rodgers valves: Push the switch to the OFF
position.
6. Wait five minutes then smell for gas. Be sure to check
near the floor, as some types of gas are heavier than
air.
7. If gas can be smelled following the five minute waiting
peri od in Step 6, immediately follow the instructions on
Page 3 of this manual. If you do not smell gas after five
minutes:
White-Rodgers valves: Push the switch to the ON
position.
8. Replace the door on the front of the furnace.
21
120 VAC
power supply properly
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Table of Contents
Troubleshooting
