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935SB: Installation, Start-up, Operating and Service Maintenance Instructions
g. When correct input rate and temperature rise is achieved, turn
gas valve ON/OFF switch to OFF.
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.
h. Remove manometer or similar device from gas valve.
i. Reinstall manifold pressure tap plug in gas valve.
WARNING
!
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.
19. Adjust heating blower-OFF delay. The blower-OFF delay has four
adjustable settings from 90 sec to 180 sec. Refer to the FURNACE
CONTROL PROGRAMMING AND NAVIGATION section of
this manual for instructions.
Factory off delay setting is 120 sec.
20. Set airflow CFM for cooling. See
filter).
21. Adjust cooling blower-OFF delay. Refer to the FURNACE
CONTROL PROGRAMMING AND NAVIGATION section of
this manual for instructions.
WARNING
!
FIRE HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Gas valve outlet pressure tap must be tightened 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.
Check Safety Controls
1. Check Main Limit Switch(es)
This control shuts off combustion control system and energizes
air-circulating blower motor, if furnace overheats. By using this
method to check limit control, it can be established that limit is
functioning properly and will operate if there is a restricted duct
system or motor failure. If limit control does not function during
this test, cause must be determined and corrected.
a. Run furnace for at least 5 minutes.
b. Gradually block off return air with a piece of cardboard or sheet
metal until the limit trips.
c. Unblock return air to permit normal circulation for 5 minutes.
d. Main limit circuit open causes 3 hour lock out.
e. Reset unit power to clear limit fault lockout.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table
20-Air Delivery CFM (with
Checklist
• Put away tools and instruments. Clean up debris.
• Check Input/Output gas pressure
• Check heat rise per application static pressure
• Cooling CFM per application static pressure
• Verify that blower-OFF delay time is selected as desired.
• Verify that blower and burner access doors are properly installed.
• Cycle test furnace with room thermostat.
• Check operation of accessories per manufacturer's instructions.
• Review User's Guide with owner.
• Attach literature packet to furnace.
Table 26 – Gas Rate (CU ft./hr)
SEC
SIZE OF TEST DIAL
FOR 1
1 Cu
2 Cu
REV
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
50
72
144
51
71
141
52
69
138
53
68
136
54
67
133
52
SEC
SIZE OF TEST DIAL
5 Cu
FOR 1
1 Cu
2 Cu
REV
Ft.
Ft.
Ft.
1800
55
65
131
1636
56
64
129
1500
57
63
126
1385
58
62
124
1286
59
61
122
1200
60
60
120
1125
62
58
116
1059
64
56
112
1000
66
54
109
947
68
53
106
900
70
51
103
857
72
50
100
818
74
48
97
783
76
47
95
750
78
46
92
720
80
45
90
692
82
44
88
667
84
43
86
643
86
42
84
621
88
41
82
600
90
40
80
581
92
39
78
563
94
38
76
545
96
38
75
529
98
37
74
514
100
36
72
500
102
35
71
486
104
35
69
474
106
34
68
462
108
33
67
450
110
33
65
439
112
32
64
429
116
31
62
419
120
30
60
409
124
29
58
400
129
28
56
391
133
27
54
383
138
26
52
375
144
25
50
367
150
24
48
360
157
23
46
355
164
22
44
346
171
21
42
340
180
20
40
333
5 Cu
Ft.
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
145
140
135
130
125
120
115
110
105
100
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