23
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 lighting codes.
Follow the start-up and adjustment items, refer to further information
in
Section XIII, Operational Checks
.
F
URNACE
OPERATION
Purge gas lines of air prior to start-up. Do not purge lines into an
enclosed burner compartment.
Check for leaks using an approved chloride-free soap and water
solution, an electronic combustible gas detector, or other approved
method. Verify that all required kits (propane gas, high altitude,
etc.) have been appropriately installed.
NOTE:
An interlock switch prevents furnace operation if the blower
door is not in place. Keep the blower access doors in place except
for inspection and maintenance.
F
URNACE
S
TART
-
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. Move the furnace gas valve manual control to the OFF
position.
6. Wait five minutes then smell for gas. Be sure check near
the floor as some types of gas are heavier than air.
7. If you smell gas after five minutes, immediately follow the
instructions on page 5 of this manual. If you do not smell
gas after five minutes, move the furnace gas valve manual
control to the ON position.
8. Replace the burner compartment door.
9. Open the manual gas shutoff valve external to the furnace.
10. Turn on the electrical power to the furnace.
11. Adjust the thermostat to a setting above room temperature.
12. After the burners are lit, set the thermostat to desired
temperature.
NOTE:
There is an approximate 30 second delay between
thermostat energizing and burner firing.
F
URNACE
S
HUTDOWN
1. Set the thermostat to lowest setting.
2. Turn off the electrical power supply to the furnace.
3. Remove the burner compartment door and move the furnace
gas valve manual control to the OFF position.
4. Close manual gas shutoff valve external to the furnace.
5. Replace the burner compartment door.
• R and W1 (or R and W1/W2) thermostat contacts open,
completing the call for heat.
• Gas valve closes, extinguishing flame.
• Induced draft blower is de-energized following a fifteen
second post purge. Humidifier terminals are de-energized.
• Circulator blower continues running for the selected heat
off delay period (90, 120, 150 or 180 seconds). The speed
run during this period depends on the last heat call provided
by the thermostat.
If the last call for heat was a call for high heat, the air
circulating motor will run on the high heating speed for thirty
seconds and then switch to the low heating speed for the
balance
of the heat off delay period
• Electronic air cleaner terminals is de-energized
• Circulator blower ramps down to OFF during the 30 seconds
following the heat off delay period.
• Furnace awaits next call from thermostat.
N
ORMAL
C
OOLING
S
EQUENCE
- I
NTEGRATED
I
GNITION
C
ON
-
TROL
• R and YLO/G or Y/G thermostat contacts close, initiating a
call for cool.
• Integrated control module performs safety circuit checks.
• Outdoor fan and compressor are energized to their
appropriate speed.
• Circulator blower is energized on the appropriate cool speed
following a fixed five second on delay. The circulator blower
requires 30 seconds to ramp up to full speed. Electronic air
cleaner terminals are energized with circulator blower.
• Furnace circulator blower and outdoor cooling unit run their
appropriate speed, integrated control module monitors safety
circuits continuously.
• R and YLO/G or Y/G thermostat contacts open, completing
the call for cool.
• Outdoor fan and compressor are de-energized.
• Circulator blower continues running for a cool off delay
period. The OFF delay time and airflow level are determined
by the selected ramping profile.
• Electronic air cleaner terminals and circulator blower are
de-energized.
• Furnace awaits next call from thermostat.
C
ONSTANT
F
AN
• R and G thermostat contacts close, initiating a call for fan.
• Integrated control module performs safety circuit checks.
• Circulator blower is energized on continuous fan speed (56%
of high stage cooling) following a five (5) second delay.
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 next call from thermostat.
XII. START-UP PROCEDURE AND ADJUSTMENT
Furnace must have a 115 VAC power supply properly connected
and grounded. Proper polarity must be maintained for correct
operation. An interlock switch prevents furnace operation if the
blower door is not in place. Keep the blower access door in place
except for inspection and maintenance.
