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TIME FOR
ONE REVOLUTION
(SECONDS)
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
CUBIC
FEET PER REVOLUTION
OF
METER
1
150
138
129
120
113
106
100
95
90
86
82
78
75
72
69
67
64
62
60
58
56
5
10
750
1500
692
1385
643
1286
600
1200
563
1125
529
1059
500
1000
474
947
450
900
429
857
409
818
391
783
375
750
360
720
346
692
333
667
321
643
310
621
300
600
290
581
281
563
GAS FLOW RATE (CUBIC FEET PER HOUR)
TIME FOR
ON E R EVOLUTION
(SECOoN DS)
82
84
86
88
9O
92
94
96
19080
102
104
106
108
110
112
114
116
118
120
CUBIC
FEET PER REVOLUTION
OF
METER
1
45
44
43
42
41
4O
39
38
38
37
36
35
35
34
33
33
32
32
31
31
30
5
10
225
450
220
439
214
429
209
419
205
409
200
400
196
391
191
383
188
375
184
367
180
360
176
353
173
346
170
340
167
333
164
327
161
321
158
316
155
310
153
305
150
300
Table 9. Gas Flow Rate
The furnace
is equipped
with a multispeed
motor. Heating and cooling speed selection
is
made by moving the leads on the integrated
control board located in the furnace. The wiring
diagram on the furnace and Figure 30 show the
speed taps for adjusting
motor speed.
If it is desired that the blower operate at the same
speed
for heating
and cooling,
tape off the
terminal of the unused blower wire. Install the
jumper wire, found in the plastic instruction bag,
across the HEAT and COOL taps on the control
board. Reconnect the desired blower tap to the
piggyback
quick connect.
The blower
control
is designed
to start the
circulating
air blower 30 seconds after the gas
valve is opened. The blower control is factory
wired to turn the blower motor off 120 seconds
after the gas valve is closed. This timing can be
changed using the BLOWER OFF timing switch
opposite the terminal block on the control board
(See Figure 27).
Verifying
Burner
Operation
To verify operation of the burners, remove front
door and ensure that the door switch is in the "on"
position (see Figure 29). Set the thermostat
above room temperature
and observe the igni-
tion sequence.
The flame can be observed
through the small clear window on the burner
box. The burner flame should carry over be=
tween all burners. The flames should be blue,
without yellow tips. Flames should extend from
each burner without lifting, curling, or floating.
After verifying ignition, set the thermostat below
room temperature
and verify that the burner
flame extinguishes
completely.
Replace
the
front door.
Verifying
Operation
of the Supply
Air
Limit
Switch
To verify operation of the supply air limit switch,
make sure that the blower door is in place and
that there is power to the furnace.
Completely
block the return airflow to the furnace by install-
ing a close-off plate in place of or upstream of
the filter(s).
Set the thermostat
above room
temperature
and verify that the Sequence
of
Operation is as described in these instructions.
The supply air
limit switch should function to
turn off the gas valve within approximately
five
minutes.
The circulating
air and combustion
blowers should continue to run when the supply
FURNACE
Kit
A/C Coil Box
Side Return Air Kit
Top Return Air Kit
Sloped Roof VentilAire III Kit
Sloped Roof VentilAire IV Kit
Soffit VentilAire Kit
Concentric Vent Termination Kit
(for horizontal and vertical venting)
Horizontal Exterior Vent
Mounting Kit (3" PVC)
Neutralizer Kit - All Models
Table 10.
ACCESSORY
KITS
Order Number
911969A
904003
904015
914098
914229
917201
904176 (3")
904177 (2")
902375
902377
Accessory
Kits
28
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