Set Temperature Rise - Carrier 58MVP Installation, Start-Up, And Operating Instructions Manual

Table 12—Gas Rate Cu Ft/Hr
SIZE OF TEST DIAL
SECONDS
FOR 1
1 2 5
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
DO NOT redrill orifices. Improper drilling (burrs, out-of-
round holes, etc.) can cause excessive burner noise and
misdirection of burner flames. This can result in flame
impingement of burners and heat exchangers, causing
failures.
NOTE: If orifice hole appears damaged or it is suspected to have
been redrilled, check the orifice hole with a numbered drill bit of
the correct size. Never redrill an orifice. A burr-free and squarely
SIZE OF TEST DIAL
SECONDS
FOR 1
1 2 5
REVOLUTION
cu ft cu ft cu ft
50 72 144 360
51 71 141 355
52 69 138 346
53 68 136 340
54 67 133 333
55 65 131 327
56 64 129 321
57 63 126 316
58 62 124 310
59 61 122 305
60 60 120 300
62 58 116 290
64 56 112 281
66 54 109 273
68 53 106 265
70 51 103 257
72 50 100 250
74 48 97 243
76 47 95 237
78 46 92 231
80 45
90 225
82 44 88 220
84 43 86 214
86 42 84 209
88 41 82 205
90 40 80 200
92 39 78 196
94 38 76 192
96 38 75 188
98 37 74 184
100 36 72 180
102 35 71 178
104 35 69 173
106 34 68 170
108 33 67 167
110 33 65 164
112 32 64 161
116 31 62 155
120 30 60 150
BURNER
ORIFICE
A93059
aligned orifice hole is essential for proper flame characteristics.
g. Remove jumper R-W2 after high-heat adjustment.
h. Replace burner enclosure front and measure adjusted gas
input rate using method outlined in item 2.
i. Replace caps that conceal gas valve regulator adjustment
screws.
Be sure burner enclosure front is in place after adjustments
have been made.
j. Look through sight glass in burner enclosure and check
burner flame. The burner flame should be clear blue, almost
transparent. (See Fig. 47.)
BURNER FLAME
MANIFOLD
Fig. 47—Burner Flame

SET TEMPERATURE RISE

Temperature rise must be within limits specified on unit
rating plate. Recommended operation is at midpoint of rise or
above. Failure to follow this caution may result in condensing
or overheating the heat exchangers.
Furnace must operate within range of temperature rise specified on
the unit rating plate. Determine air temperature rise as follows:
1. Place thermometers in return and supply ducts as near furnace
as possible. Be sure thermometers do not see heat exchanger
so that radiant heat does not affect readings. This practice is
particularly important with straight-run ducts.
2. When thermometer readings stabilize, subtract return-air tem-
perature from supply-air temperature to determine air tem-
perature rise.
NOTE: Temperature rise can be determined for low-fire opera-
tion by placing setup switch SW-2 on control center in the ON
position. For high-heat operation, place setup switch SW-2 in the
OFF position and jumper R-W2 on control center. DO NOT forget
to return setup switch to OFF position and remove R-W2 jumper
upon completion of testing. (See Fig. 25 for switch and terminal
location.)
3. This furnace is capable of automatically providing the proper
airflow to maintain the temperature rise within the range
specified on the unit rating plate. If the temperature rise is
outside this range, proceed as follows:
a. Check gas input for low- and high-heat operation.
b. Check derate for altitude if applicable.
37
BURNER
A89020