Instruction manual

42
BLOWER PERFORMANCE DATA
■ Normal furnace
operation.
■ Integrated
control module
diagnostic LED
is flashing
7flashes.
7 flashes
■ Flame sense
microamp signal
is low.
■ Flame sensor is coated/
oxidized.
■ Flame sensor incorrectly
positioned in burner
flame.
■ Lazy burner flame due to
improper gas pressure
or combustion air.
■ Sand flame sensor if
coated/oxidized.
■ Inspect for proper
sensor alignment.
■ Compare current gas
pressure to rating plate
info. Adjust as needed.
■ Turn off power
prior to repair.
■ Sand flame
sensor with
emery cloth.
■ See “Vent/Flue
Pipe” section for
piping details.
■ See rating plate
for proper gas
pressure.
■ No furnace
operation
■ Integrated
control module
diagnostic LED
is flashing
8flashes.
8 flashes
■ Problem with
igniter circuit.
■ Improperly connected
igniter.
■ Bad igniter.
■ Poor unit ground.
■ Poor burner ground.
■ Faulty integrated control
module.
■ Check and correct
wiring from integrated
control module to
igniter
■ Replace bad igniter.
■ Check and correct
furnace ground wiring
■ Replace faulty
integrated control
module.
■ Turn off power
prior to repair.
■ Replace igniter
with correct
replacement part.
■ Replace
integrated control
module with
correct
replacement part.
■ Read precautions
in “Electrostatic
Discharge”
section of
manual.
■ Induced draft
blower runs
continuously.
No furnace
operation.
■ Integrated
control module
diagnostic LED
is flashing
continuously.
Continuous
flashes
■ Polarity of 115-
volt or 24-volt
power is
reversed.
■ Polarity of 115-volt AC
power to furnace or
integrated control
module is reversed.
■ Red and blue wires to
transformer are
reversed.
■ Poor unit ground.
■ Review wiring diagram
to correct polarity.
■ Verify proper ground.
Correct if necessary.
■ Reverse red and blue
wires connected to
transformer.
■ Turn off power
prior to repair.
Symptoms of
Abnormal
Operation
Associated
LED Code Fault Description Possible Causes Corrective Actions
Notes and
Cautions
Blower Performance Data
CFM and Temperature Rise vs. External Static Pressure
Model—Heating
Speed as Shipped
Motor
Speed
Tons
AC at
0.5"
ESP
External Static Pressure (Inches Water Column)
0.1 0.2 0.3 0.4 0.5
0.6 0.7 0.8
CFMRiseCFMRiseCFMRiseCFMRiseCFMRise
CFM CFM CFM
WGFM1950453BXA
(MED-HI)
High 3.0 1,352 29 1,318 30 1,260 31 1,202 33 1,128 35
1,044 955 853
Med 2.5 1,214 32 1,172 34 1,123 35 1,064 37 1,012 39
938 859 741
Med-Lo 2.0 997 40 994 40 960 41 923 43 884 45
817 741 611
Low 1.5 757 52 753 52 734 54 704 56 674 59
620 524 438
WGFM1950703BXA
(MED-HI)
High 3.0 1,449 41 1,409 42 1,326 45 1,273 47 1,201 49
1,194 1,136 1,018
Med 2.5 1,192 50 1,172 51 1,141 52 1,094 54 1,046 57
973 904 793
Med-Lo 2.0 981 61 962 62 943 63 917 65 888 67
830 764 665
Low 1.5 750 79 730 81 714 83 692 86 657 90
620 570 502