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(3.) Return and supply ducts for excessive restrictions
causing static pressures greater than 0.50- -In. W.C.
(4.) Ensure Comfort/Efficiency SW 1- -4 on furnace con-
trol is in OFF=Efficiency position when a bypass
humidifier is used. (See Fig. 26 for switch location)
(5.) Make sure proper model plug is installed.
c. Turn thermostat down below room temperature and re-
move blower access door.
d. To increase heating airflow, set Comfort/Efficiency
SW1- -4 of furnace control to OFF=Efficiency position.
e. Careful not to put tension on any wire connections
f. Repeat steps a through e.
g. When correct input rate and temperature rise is achieved,
turn gas valve ON/OFF switch to OFF.
h. Remove manometer or similar device from gas valve.
i. Reinstall manifold pressure tap plug in gas valve.
j. Turn gas valve ON/OFF switch to ON.
WARNING
!
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Reinstall manifold pressure tap plug in gas valve to prevent
gas leak.
CAUTION
!
FURNACE OVERHEATING HAZARD
Failure to follow this caution may result in reduced furnace
life.
Recheck temperature rise. It must be within limits specified
on the rating plate. Recommended operation is at the
mid- -point of rise range or slightly above.
6. Set thermostat heat anticipator.
a. Mechanical thermostat - - Set thermostat heat anticipator
to match the amp. draw of the electrical components in
the R- -W circuit. Accurate amp. draw readings can be ob-
tained at the wires normally connected to thermostat sub-
base terminals, R and W. The thermostat anticipator
should NOT be in the circuit while measuring current.
(1.) Remove thermostat from subbase or from wall.
(2.) Connect an amp. meter as shown in Fig. 44 across
the R and W subbase terminals or R and W wires at
wall.
(3.) Record amp. draw across terminals when furnace is
in heating and after blower starts.
(4.) Set heat anticipator on thermostat per thermostat in-
structions and install on subbase or wall.
b. Electronic thermostat: Set cycle rate for 4 cycles per hr.
7. Adjust blower off delay The blower off delay has 4 ad-
justable settings from 90 sec to 180 sec. The blower off
delay jumpers are located on the furnace control board.
(See Fig. 26.)
To change the blower off delay setting, move the jumper
from one set of pins on the control to the pins used for the
selected blower off delay. Factory off delay setting is 120
sec.
8. Set airflow CFM for cooling
Select the desired blower motor speed lead for cooling air-
flow. See Table 4- -Air Delivery- -CFM (With Filter) for
lead color identification.
Table 10 – Gas Rate (CU ft./hr)
SIZE OF TEST DIAL
SECONDS
FOR 1
1
2
Cu
Cu
REVOLU-
TION
Ft.
Ft.
10
360
720
11
327
655
12
300
600
13
277
555
14
257
514
15
240
480
16
225
450
17
212
424
18
200
400
19
189
379
20
180
360
21
171
343
22
164
327
23
157
313
24
150
300
25
144
288
26
138
277
27
133
267
28
129
257
29
124
248
30
120
240
31
116
232
32
113
225
33
109
218
34
106
212
35
103
206
36
100
200
37
97
195
38
95
189
39
92
185
40
90
180
41
88
176
42
86
172
43
84
167
44
82
164
45
80
160
46
78
157
47
76
153
48
75
150
49
73
147
37
SIZE OF TEST DI-
AL
SECONDS
1
C
FOR 1
2
5 Cu
u
Cu
REVOLU-
Ft.
TION
Ft.
Ft.
1800
50
72
144
1636
51
71
141
1500
52
69
138
1385
53
68
136
1286
54
67
133
1200
55
65
131
1125
56
64
129
1059
57
63
126
1000
58
62
124
947
59
61
122
900
60
60
120
857
62
58
116
818
64
56
112
783
66
54
109
750
68
53
106
720
70
51
103
692
72
50
100
667
74
48
97
643
76
47
95
621
78
46
92
600
80
45
90
581
82
44
88
563
84
43
86
545
86
42
84
529
88
41
82
514
90
40
80
500
92
39
78
486
94
38
76
474
96
38
75
462
98
37
74
450
100
36
72
439
102
35
71
429
104
35
69
419
106
34
68
409
108
33
67
400
110
33
65
391
112
32
64
383
116
31
62
375
120
30
60
367
5
Cu
Ft.
360
355
346
340
333
327
321
316
310
305
300
290
281
273
265
257
250
243
237
231
225
220
214
209
205
200
196
192
188
184
180
178
173
170
167
164
161
155
150
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