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Before beginning any troubleshooting procedure, complete the following installation checklist. A furnace malfunction is
sometimes caused by an improper installation. By completing this checklist, the problem may be found and corrected. Make
copies of the checklist and complete one for every Low Profile Furnace service call for your records.
INSTALLATION CHECKLIST
(Refer to this manual for specifics.)
GAS SUPPLY
Adequate pipe size
No gas leaks
Proper supply and manifold gas pressure (check with an accurate U-tube manometer with the furnace and all other gas
appliances operating.)
ELECTRICAL
Correct thermostat and subbase
Thermostat model
Subbase model
Correct thermostat mode and setting
Correct line supply voltage
Correct power supply polarity is required with electronic ignition
Correct furnace ground to electrical panel
DC microamp (
µ
A) flame signal (hot surface ignition units)
Correct control voltage
Measure and set heat anticipator amperage
Air conditioning low voltage wires connected to terminals “Y” “C” -
not with wire nuts
VENTING
Correct vent pipe diameter and length (according to CSA tables) Vent connection size
Correct venting material (according to CSA tables)
Correct lining for masonry chimneys
Adequate clearance from combustibles
Proper negative pressure reading in the vent
Vent pipe secured to induced draft blower housing
COMBUSTION AIR
Proper source of combustion air
Correct combustion air opening size
FURNACE INSTALLATION
Adequate clearance from combustibles
Adequate clearance for service
Proper air temperature rise (See furnace rating plate)
External static pressure
inches w.c.
Correct filter(s)
Correct cooling coil or accessories (if equipped)
Adequate supply and return air ducting
Return Air Duct Size
Supply Air Duct Size
Air ducts sealed to prevent leakage