935CA: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
51
Table 23 – Gas Valve Outlet Pressure for Gas Heat Values at
Altitude - 100,000
5. Verify natural gas input rate by clocking meter.
NOTE:
Gas valve regulator adjustment cap must be in place for proper
input to be clocked.
a. Turn off all other gas appliances and pilots served by the meter.
a.
Jumper R an
d W/W1 t
hermostat connections at the furnace
control board.
b. Run furnace for 15 minutes in heating operation.
c. Measure time (in seconds) for gas meter to complete 1 revolution
and note reading. The 2 or 5 cubic feet dial provides a more
accurate measurement of gas flow.
d. For cubic ft. of gas per hr, see
Table 24
.
e. Multiply gas rate (cu ft./hr) by heating value (BTUh/cu ft.) to
obtain input.
Table 24 – Gas Rate (CU ft./hr)
If clocked rate does not match required input from Step 1, increase gas
valve outlet pressure to increase input or decrease gas valve outlet
pressure to decrease input. Repeat steps b through e until correct input is
achieved. Reinstall regulator seal cap on gas valve.
6. Restore furnace to normal operating condition.
a. When correct input rate and temperature rise is achieved, remove
jumper across thermostat connections to terminate call for heat.
Wait until the blower off-delay is completed, turn gas valve
ON/OFF switch to OFF.
b. Remove manometer or similar device from gas valve.
c. Tighten set screw on outlet tower pressure tap with 3/32 in. hex
wrench.
d. Turn gas valve ON/OFF switch to ON.
(Tabulated Data Based on 100,000 BTUH Input for 0-ft (0m) to
5400-ft (1646 M) above sea level)
ALTITUDE
RANGE
ft (m)
AVG. GAS
HEAT
VALUE AT
ALTITUDE
(Btu/cu ft)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
0.66
0.68
Manifold Pressure
900
2.7
2.8
2.9
3.0
3.1
3.1
0
925
2.6
2.7
2.7
2.8
2.9
3.0
(0)
950
2.4
2.5
2.6
2.7
2.8
2.9
975
2.3
2.4
2.5
2.6
2.6
2.7
to
1000
2.2
2.3
2.4
2.4
2.5
2.6
1025
2.1
2.2
2.2
2.3
2.4
2.5
2000
1050
2.0
2.1
2.1
2.2
2.3
2.3
(610)
1075
1.9
2.0
2.0
2.1
2.2
2.2
1100
1.8
1.9
1.9
2.0
2.1
2.1
800
2.9
3.0
3.1
3.1
3.1
3.1
2001
825
2.8
2.9
3.0
3.0
3.1
3.1
(611)
850
2.6
2.7
2.8
2.9
3.0
3.1
875
2.5
2.5
2.6
2.7
2.8
2.9
to
900
2.3
2.4
2.5
2.6
2.6
2.7
925
2.2
2.3
2.3
2.4
2.5
2.6
3000
950
2.1
2.2
2.2
2.3
2.4
2.4
(914)
975
2.0
2.0
2.1
2.2
2.3
2.3
1000
1.9
1.9
2.0
2.1
2.1
2.2
775
2.9
3.0
3.1
3.1
3.1
3.1
800
2.7
2.8
2.9
3.0
3.1
3.1
3001
825
2.6
2.6
2.7
2.8
2.9
3.0
(915)
850
2.4
2.5
2.6
2.7
2.7
2.8
to
875
2.3
2.3
2.4
2.5
2.6
2.7
900
2.1
2.2
2.3
2.4
2.4
2.5
4000
925
2.0
2.1
2.2
2.2
2.3
2.4
(1219)
950
1.9
2.0
2.1
2.1
2.2
2.3
975
1.8
1.9
2.0
2.0
2.1
2.1
1000
1.8
1.8
1.9
1.9
2.0
2.0
750
2.8
2.9
3.0
3.1
3.1
3.1
775
2.7
2.8
2.9
2.9
3.0
3.1
4001
800
2.5
2.6
2.7
2.8
2.8
2.9
(1220)
825
2.4
2.4
2.5
2.6
2.7
2.8
850
2.2
2.3
2.4
2.4
2.5
2.6
to
875
2.1
2.2
2.2
2.3
2.4
2.5
900
2.0
2.0
2.1
2.2
2.3
2.3
5000
925
1.9
1.9
2.0
2.1
2.1
2.2
(1524)
950
1.8
1.8
1.9
2.0
2.0
2.1
975
1.8
1.8
1.8
1.9
1.9
2.0
1000
1.8
1.8
1.8
1.8
1.8
1.9
725
2.8
2.9
3.0
3.1
3.1
3.1
750
2.7
2.8
2.8
2.9
3.0
3.1
5001
775
2.5
2.6
2.7
2.7
2.8
2.9
(1525)
800
2.3
2.4
2.5
2.6
2.7
2.7
825
2.2
2.3
2.3
2.4
2.5
2.6
to
850
2.1
2.1
2.2
2.3
2.4
2.4
875
2.0
2.0
2.1
2.2
2.2
2.3
900
1.8
1.9
2.0
2.0
2.1
2.2
5400
925
1.8
1.8
1.9
1.9
2.0
2.0
(1646)
950
1.8
1.8
1.8
1.8
1.9
1.9
975
1.8
1.8
1.8
1.8
1.8
1.8
1000
1.8
1.8
1.8
1.8
1.8
1.8
SECONDS
FOR 1
REV
SIZE OF TEST DIAL SECONDS
FOR 1
REV
SIZE OF TEST DIAL
1 Cu
Ft.
2 Cu
Ft.
5 Cu
Ft.
1 Cu
Ft.
2 Cu
Ft.
5 Cu
Ft.
10
360
720
1800
55
65
131
327
11
327
655
1636
56
64
129
321
12
300
600
1500
57
63
126
316
13
277
555
1385
58
62
124
310
14
257
514
1286
59
61
122
305
15
240
480
1200
60
60
120
300
16
225
450
1125
62
58
116
290
17
212
424
1059
64
56
112
281
18
200
400
1000
66
54
109
273
19
189
379
947
68
53
106
265
20
180
360
900
70
51
103
257
21
171
343
857
72
50
100
250
22
164
327
818
74
48
97
243
23
157
313
783
76
47
95
237
24
150
300
750
78
46
92
231
25
144
288
720
80
45
90
225
26
138
277
692
82
44
88
220
27
133
267
667
84
43
86
214
28
129
257
643
86
42
84
209
29
124
248
621
88
41
82
205
30
120
240
600
90
40
80
200
31
116
232
581
92
39
78
196
32
113
225
563
94
38
76
192
33
109
218
545
96
38
75
188
34
106
212
529
98
37
74
184
35
103
206
514
100
36
72
180
36
100
200
500
102
35
71
178
37
97
195
486
104
35
69
173
38
95
189
474
106
34
68
170
39
92
185
462
108
33
67
167
40
90
180
450
110
33
65
164
41
88
176
439
112
32
64
161
42
86
172
429
116
31
62
155
43
84
167
419
120
30
60
150
44
82
164
409
124
29
58
145
45
80
160
400
129
28
56
140
46
78
157
391
133
27
54
135
47
76
153
383
138
26
52
130
48
75
150
375
144
25
50
125
49
73
147
367
150
24
48
120
50
72
144
360
157
23
46
115
51
71
141
355
164
22
44
110
52
69
138
346
171
21
42
105
53
68
136
340
180
20
40
100
54
67
133
333
