F80CTL & G80CTL: Installation, Start–Up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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method to check limit control, it can be established that limit is
functioning properly and will operate if there is a restricted
return-air supply or motor failure. If limit control does not function
during this test, cause must be determined and corrected.
a. Run furnace for at least 5 minutes.
b. Gradually block off return air with a piece of cardboard or sheet
metal until the limit trips.
c. Unblock return air to permit normal circulation.
d. Burners will re-light when furnace cools down.
2. Check draft safeguard switch. The purpose of this control is to
cause the safe shutdown of the furnace during certain blocked vent
conditions.
a. Verify vent pipe is cool to the touch.
b. Disconnect power to furnace and remove vent connector from
furnace vent elbow.
c. Restore power to furnace and set room thermostat above room
temperature.
d. After normal start-up, allow furnace to operate for 2 minutes,
then block vent elbow in furnace 80 percent of vent area with a
piece of flat sheet metal.
e. Furnace should cycle off within 2 minutes. If gas does not shut
off within 2 minutes, determine reason draft safeguard switch did
not function properly and correct condition.
NOTE: Should switch remain open longer than 3 minutes, furnace
control board will lockout the furnace for 3 hours. To reset furnace
control board, turn thermostat below room temperature or from HEAT to
OFF and turn 115-v power OFF, then back ON.
f. Remove blockage from furnace vent elbow.
g. Switch will auto-reset when it cools.
h. Re-install vent connector.
3. Check Pressure Switch(es)
This control proves operation of the draft inducer blower.
a. Turn off 115-v power to furnace.
b. Disconnect inducer motor lead wires from wire harness.
c. Turn on 115-v power to furnace.
d. Set thermostat to “call for heat” and wait 1 minute. When
pressure switch is functioning properly, hot surface igniter
should NOT glow and control diagnostic light flashes a status
code 3. If hot surface igniter glows when inducer motor is
disconnected, shut down furnace immediately.
e. Determine reason pressure switch did not function properly and
correct condition.
f. Turn off 115-v power to furnace.
g. Reconnect inducer motor wires, replace outer door, and turn on
115-v power.
h. Blower will run for 90 seconds before beginning the call for heat
again.
i. Furnace should ignite normally.
Checklist
1. Put away tools and instruments. Clean up debris.
2. Verify that switches SW1-1 and SW1-6 are OFF and other setup
switches are set as desired. Verify that switches SW1-7 and SW1-8
for the blower OFF DELAY are set as desired per Table 14.
3. Verify that blower and burner access doors are properly installed.
4. Cycle test furnace with room thermostat.
5. Check operation of accessories per manufacturer’s instructions.
6. Review User’s Guide with owner.
7. Attach literature packet to furnace.
X- Indicated an allowable selection.
Table 12 – Cooling Airflow Adjustments from 1.5 to 6 Tons
AIR CONDITIONING TONS
(12,000 BTU/HR)
AIRFLOW (CFM) 070 MODEL 090 MODEL 110 & 135 MODELS
1-1/2 525
X
2
X —
2 700 X
X
2
X
2-1/2 875 X X
X
2
3 1050
X
1
X X
3-1/2 1225 X
X
1
X
4 1400 — X X
5 1750 — —
X
1
6 2100 — — X
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