Installer’s Information Manual
Page 31
SECTION 22. SETTING BLOWER
TIMINGS
Heating blower on-delay is fixed at 30 seconds from when
main valve opens. It is not adjustable.
Heating blower off-delay is adjustable to one of four times:
60, 100, 140 or 180 seconds. Heating blower off-delay is
factory set at 140 seconds. If a different blower off-delay is
desired, do the following:
1. Find two small switches located near 24-volt terminal
strip on Fan Timer.
2. Determine switch settings for desired heating blower
off-delay. See Figure 33.
3. Set switches on Fan Timer using a small screwdriver.
NOTE: Cooling blower off-delay is fixed at 60 seconds and
is not adjustable.
Figure 33. Heating Blower Off-Delay.
SECTION 23. MAINTAINING
FURNACE IN GOOD WORKING
ORDER
WARNING
: Use replacement parts listed in parts
list only. Use of incorrect parts on this fu rnace could cause
improper fu rnace operation, resulting in damage, injury or
death.
WARNING
: Failure to disconnect electrical power
before servicing furnace could result in electrical shock or
death.
Inspection and cleaning by a qualified service person
should be performed once each heating season. Make
sure the inspection includes each of the items listed below.
??
An operational check of the entire system. Assure that
furnace is operating properly and safely.
??
Vent pipe must be in place, slope upward at least 1/4
inch per foot and must be physically sound, without
holes or loose connections.
??
All venting components including vent pipe and vent
terminal must be clear and free of obstructions.
??
Condensate drain system must be clear and free
including all inte rnal and external hoses and
condensate trap. Check for signs of condensate
leakage.
??
Furnace-room or closet combustion and ventilation air
openings must be clear and free.
??
Furnace combustion-air openings must be clear and
free.
??
Return air duct must be physically sound, sealed to
furnace casing and ending outside the space
containing furnace.
??
Supply air ducts and retu rn air ducts must be clear and
free, and without air leaks.
??
Registers and retu rn grilles must be open and
unobstructed by rug, carpet or furniture.
??
The furnace mus t be well supported without sagging,
cracks, or gaps around the base.
??
There must be no obvious signs of deterioration of the
furnace. Inspection must include burners, pilot, heat
exchanger, inducer pan, and draft inducer.
??
Flame holders, located inside the main burners, should
be free of lint or dirt. Burners can be cleaned with
compressed air.
??
Inspect all electrical wiring and connections, including
electrical ground.
??
Gas pipes must be checked for leaks using a
commercial soap solution made to detect leaks.
??
Main burners and pilot burner must be in good
adjustment as shown in the User’s Information Manual.
Main burner flame must be clear blue and centered
within heat exchanger openings.
??
Check furnace area for combustible materials,
flammable liquid near furnace, corrosive materials,
insulation material within 12 inches of fu rnace, and
signs of high water levels.
??
Inspect, clean, or repair as needed the following items:
blower housing, blower motor, blower wheel, air filters,
draft inducer, and cooling coil.
Heat exchanger flue gas passageways may be cleaned
using the following steps:
1. Remove heat exchanger from furnace.
2. Flush heat exchanger passageways with a high-
pressure water hose.
3. Replace heat exchanger.
The manufacturer recommends replacement of heat
exchanger with a new heat exchanger in the event that flue
gas passageways become blocked and cannot be cleaned.
NOTE: Blower motor and inducer motor do not require
oiling.
Follow these steps to remove blower assembly:
1. Turn off furnace electrical power.
2. Cut vent pipe and remove vent assembly from the
inducer-motor rubber coupling.
3. If necessary, cut and remove air-intake pipe.
4. Disconnect room thermostat wires from 24-volt terminal
strip on Fan Timer.
