Carrier 58MSA Installation, Start-Up, And Operating Instructions Manual page 41

Fig. 47—Burner Orifice
DO NOT redrill orifices. Improper drilling (burrs, out-of-
round hole, etc.) can cause excessive burner noise and
misdirection of burner flames. This can result in flame
impingement of burners and heat exchangers causing failures.
(See Fig. 47.)
BURNER FLAME
MANIFOLD
Fig. 48—Burner Flame
NOTE: Be sure all pressure tubing, combustion-air and vent
pipes, and burner enclosure front are in place when checking input
by clocking gas meter.
a. Calculate high-altitude adjustment (if required).
Table 10—Altitude Derate Multiplier for U.S.A.
ALTITUDE % OF
(FT) DERATE
0—2000 0
2001—3000 4—6
3001—4000 6—8
4001—5000 8—10
5001—6000 10—12
6001—7000 12—14
7001—8000 14—16
8001—9000 16—18
9001—10,000 18—20
* Derate multiplier factor is based on midpoint altitude for altitude range.
United States
At altitudes above 2000 ft, this furnace has been approved for a 2%
derate for each 1000 ft above sea level. See Table 10 for derate
BURNER
ORIFICE
A93059
BURNER
A89020
DERATE MULTIPLIER
FACTOR FOR U.S.A*
1.00
0.95
0.93
0.91
0.89
0.87
0.85
0.83
0.81
41
multiplier factor.
EXAMPLE: 100,000 Btuh input furnace installed at 4300 ft.
Derate
Furnace Input Rate
X Multiplier
at Sea Level
100,000 X
Canada
At installation altitudes from 2001 to 4500 ft, this furnace must be
derated 5% by an authorized Gas Conversion Station. To deter-
mine correct input rate for altitude, see example above and use
0.95 as derate multiplier factor.
b. Reinstall burner box cover.
c. Gas valve regulator seal cap MUST be installed.
d. Turn off all other gas appliances and pilots.
e. Start furnace and let operate for 3 minutes.
f. Measure time (in sec) for gas meter test dial to complete 1
revolution.
g. Refer to Table 11 for cu ft of gas per hr.
Table 11—Gas Rate (Cu Ft/Hr)
SIZE OF TEST DIAL
SECONDS
FOR 1
1 2
REVOLUTION
cu ft cu ft cu ft
10 360 720 1800
11 327 655 1636
12 300 600 1500
13 277 555 1385
14 257 514 1286
15 240 480 1200
16 225 450 1125
17 212 424 1059
18 200 400 1000
19 189 379 947
20 180 360 900
21 171 343 857
22 164 327 818
23 157 313 783
24 150 300 750
25 144 288 720
26 138 277 692
27 133 267 667
28 129 257 643
29 124 248 621
30 120 240 600
31 116 232 581
32 113 225 563
33 109 218 545
34 106 212 529
35 103 206 514
36 100 200 500
37 97 195 486
38 95 189 474
39 92 185 462
40 90 180 450
41 88 176 439
42 86 172 429
43 84 167 419
44 82 164 409
45 80 160 400
46 78 157 391
47 76 153 383
48 75 150 375
49 73 147 367
h. Multiply gas rate (cu ft/hr) X heating value (Btu/cu ft)
using natural gas heating value from local gas
utility/supplier.
Furnace Input Rate
= at Installation
Factor Altitude
0.91 = 91,000
SIZE OF TEST DIAL
SECONDS
FOR 1
5 1 2
REVOLUTION
cu ft cu ft
50 72 144
51 71 141
52 69 138
53 68 136
54 67 133
55 65 131
56 64 129
57 63 126
58 62 124
59 61 122
60 60 120
62 58 116
64 56 112
66 54 109
68 53 106
70 51 103
72 50 100
74
48 97
76 47 95
78 46 92
80 45 90
82 44 88
84 43 86
86 42 84
88 41 82
90 40 80
92 39 78
94 38 76
96 38 75
98 37 74
100 36 72
102 35 71
104 35 69
106 34 68
108 33 67
110 33 65
112 32 64
116 31 62
120 30 60
124 29 58
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
145