Carrier 59SC6A Installation Instructions Manual page 59

59SC6A: Installation, Start-up, Operating and Service and Maintenance Instructions
CAUTION
!
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in reduced furnace life.
The 26,000 BTUh model has a lower nominal manifold pressure than
other models. Do not adjust the natural gas manifold pressure above
1.8-in. w.c.
The 26,000 BTUh model can be identified by the green label affixed to
the solenoid of the gas valve.
Refer to the Adjustment section for setting the manifold pressure.
USE Table 26 WHEN ADJUSTING 26,000 BTUh MODEL
MANIFOLD PRESSURE.
Standard Capacity Gas Valve with Tower Pressure Ports
26,000 BTUh Low Capacity Gas Valve with Tower Pressure Ports
Fig. 65 – Gas Valves
NOTE: Contact your HVAC distributor or gas supplier for metric gas
meter Tables, if required.
2. Verify natural gas input rate by clocking meter.
a. Turn off all other gas appliances and pilots served by the meter.
b. Jumper R to W.
!
For 40,000 BTUh models through 120,000 BTUh models: DO NOT set
manifold pressure less than 2.8-in. w.c. (697 Pa) or more than 3.8 in.
w.c. (947 Pa) for natural gas. If required manifold pressure is outside
this range, change main burner orifices to obtain manifold pressure in
this range.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
NOTICE
Table 24 – Gas Rate (CU ft./hr)
SEC SIZE OF TEST DIAL
FOR 1 1 Cu
REV Ft.
10 360
11 327
12 300
13 277
14 257
15 240
16 225
17 212
18 200
19 189
20 180
21 171
22 164
23 157
24 150
25 144
26 138
27 133
28 129
29 124
30 120
31 116
32 113
33 109
34 106
35 103
36 100
37 97
38 95
39 92
A170140
40 90
41 88
42 86
43 84
44 82
45 80
46 78
47 76
48 75
49 73
50 72
51 71
52 69
53 68
54 67
c. Run furnace for 3 minutes.
A170118
d. Measure time (in sec) for gas meter to complete one revolution
and note reading. The 2 or 5 cubic feet dial provides a more
accurate measurement of gas flow.
e. Refer to Table 24
f. Multiply gas rate cu ft./hr by heating value (BTUh/cu ft.) to
obtain input rate.
g. If clocked rate does not match required input from Step 1,
increase manifold pressure to increase input or decrease manifold
pressure to decrease input. Repeat steps b through e until correct
input is achieved. Re-install regulator seal cap on gas valve.
59
SEC SIZE OF TEST DIAL
2 Cu 5 Cu FOR 1 1 Cu
Ft. Ft. REV Ft.
720 1800 55 65
655 1636 56 64
600 1500 57 63
555 1385 58 62
514 1286 59 61
480 1200 60 60
450 1125 62 58
424 1059 64 56
400 1000 66 54
379 947 68 53
360 900 70 51
343 857 72 50
327 818 74 48
313 783 76 47
300 750 78 46
288 720 80 45
277 692 82 44
267 667 84 43
257 643 86 42
248 621 88 41
240 600 90 40
232 581 92 39
225 563 94 38
218 545 96 38
212 529 98 37
206 514 100 36
200 500 102 35
195 486 104 35
189 474 106 34
185 462 108 33
180 450 110 33
176 439 112 32
172 429 116 31
167 419 120 30
164 409 124 29
160 400 129 28
157 391 133 27
153 383 138 26
150 375 144 25
147 367 150 24
144 360 157 23
141 355 164 22
138 346 171 21
136 340 180 20
133 333
for cubic ft. of gas per hr.
2 Cu 5 Cu
Ft. Ft.
131 327
129 321
126 316
124 310
122 305
120 300
116 290
112 281
109 273
106 265
103 257
100 250
97 243
95 237
92 231
90 225
88 220
86 214
84 209
82 205
80 200
78 196
76 192
75 188
74 184
72 180
71 178
69 173
68 170
67 167
65 164
64 161
62 155
60 150
58 145
56 140
54 135
52 130
50 125
48 120
46 115
44 110
42 105
40 100