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

Table 15—Altitude Derate Multiplier for U.S.A.
ALTITUDE PERCENT
(FT) OF 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.
Table 16—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
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
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

SET TEMPERATURE RISE

UNIT DAMAGE HAZARD
Failure to follow this caution may result in overheating the
heat exchangers or condensing flue gases in heat exchanger
areas not designed for condensate.
Temperature rise must be within limits specified on furnace
rating plate. Recommended operation is at midpoint of rise
range or slightly above.
Place SW-1 in ON position. Jumper R to W/W1 and W2 to check
high-gas-heat temperature rise. To check low-gas-heat temperature
rise, remove jumper to W2. Determine air temperature rise for both
high and low gas heat. Do not exceed temperature rise ranges
specified on unit rating plate for high and low gas heat.
This furnace must operate within the temperature rise ranges
specified on the furnace rating plate. Determine the air temperature
as follows:
5
Cu Ft
a. Place duct thermometers in return and supply ducts as close
360
to furnace as possible. Be sure thermometers do not 'see'
355
heat exchangers so that radiant heat does not affect ther-
346
mometer readings. This is particularly important with
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straight run ducts.
333
b. When thermometer readings stabilize, subtract return-air
327
temperature from supply-air temperature to determine tem-
321
perature rise.
316
310
If the temperature rise is outside this range, check the following:
305
a. Gas input for low- and high gas heat operation.
300
b. Derate for altitude if applicable.
290
281
c. Return and supply ducts for excessive restrictions causing
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static pressures greater than 0.50-in. wc.
265
d. Adjust temperature rise by adjusting blower speed. In-
257
crease blower speed to reduce temperature rise. Decrease
250
blower speed to increase temperature rise.
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237
231
225
ELECTRICAL SHOCK HAZARD
220
Failure to follow this warning could result in personal injury
214
or death.
209
Disconnect 115-v electrical power before changing speed tap.
205
For high-heat, the following connections can be made at HI HEAT
200
on control:
196
192
a. Med-high (Yellow)
188
b. Med (Orange) -Available only on 5-speed motors. Factory
184
setting for these motors.
180
c. Med-Low (Blue) - Do NOT use for HI GAS-HEAT on
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80K & 120K Btuh input models. Factory setting for
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4-speed motors.
170
167
164
161
UNIT DAMAGE HAZARD
155
Failure to follow this caution may result in damage to the heat
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exchangers due to over temperature or condensate corrosion.
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1. NEVER connect Low Speed (Red) wire to "HI HEAT".
2. Do NOT connect Medium Low Speed (Blue) wire to "HI
-HEAT" on 80,000 Btuh and 120,000 Btuh input model
sizes.
56