B. Check Pressure Switch
This control proves operation of draft inducer. Check switch
operation as follows:
1. Turn off 115-v power to furnace.
2. Remove main furnace door and disconnect inducer motor
lead wires from wire harness.
3. Turn on 115-v power to furnace.
4. Set thermostat to call for heat and wait 1 minute. When
pressure switch is functioning properly, hot surface ignitor
should NOT glow, and control center diagnostic light
flashes a Status Code 31. If hot surface ignitor glows when
inducer motor is disconnected, shut furnace down immedi-
ately. Determine reason pressure switch did not function
properly and correct condition.
5. Turn off 115-v power to furnace.
6. Reconnect inducer motor leads, reinstall main furnace door,
and turn on 115-v power supply.
VI. CHECKLIST
1. Put away tools and instruments. Clean up debris.
2. Verify manual reset switch has continuity.
3. Verify that blower and control access doors are properly
installed.
4. Cycle test furnace with room thermostat.
5. Check operation of accessories per manufacturer’s instruc-
tions.
6. Review User’s Guide with owner.
7. Leave literature packet near furnace.
CHECKLIST—INSTALLATION
LOAD CALCULATION Condensate Drain
_______ Heating Load (Btuh) _______ Unit Level or Pitched Forward
_______ Cooling Load (Btuh) _______
Internal Tubing Connections Free
of Kinks and Traps
_______ Furnace Model Selection _______
External Drain Connection Leak
Tight and Sloped
COMBUSTION AND VENT PIPING _______
Condensate Trap Primed before
Start-Up
Termination Location _______ Heat Tape Installed if Required
_______ Roof or Sidewall CHECKLIST—START-UP
_______ Termination Kit — 2 Pipe or
Concentric _______
Gas Input Rate
(Set Within 2 percent of Rating
Plate)
_______ Combustion-Air Pipe Length _______ Temperature Rise Adjusted
_______ Combustion-Air Elbow Quantity
_______ Vent Pipe Length Thermostat Anticipator
_______ Vent Pipe Elbow Quantity _______ Anticipator Setting Adjusted or
_______
Pipe Diameter Determined from
Sizing Table _______
Cycle Rate (3 Cycles per Hr)
Selected
_______ Pipe Sloped to Furnace
Pipe Insulation Safety Controls Check Operation
_______ Over Ceilings _______ Primary Limit
_______ Low-Ambient Exposed Pipes _______ Pressure Switch
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