Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual page 46

Table 12—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
Table 13—Speed Selector
COLOR
Black
Yellow (When Present)
Blue
Red
White
started. See thermostat manufacturer's instructions for adjusting
heat anticipator and for varying heating cycle length.
Step 5—Check Safety Controls
This section covers the safety controls that must be checked before
the installation is complete.
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
FACTORY-
SPEED SHIPPED
CONNECTION
High Cool
Medium High Spare
Medium Low Heat
Low Spare
Common C
OM
5
Cu Ft
360
355
346
340
333
327
321
316
310
305
300
290
EXAMPLE: 5.0 AMPS ON AMMETER
281 10 TURNS AROUND JAWS
273
265
Fig. 60—Amp Draw Check with Ammeter
257
CHECK PRIMARY LIMIT CONTROL
250
243
This control shuts off combustion control system and energizes
237
air-circulating blower motor if furnace overheats. Recommended
231
method of checking this limit control is to gradually block off
225
return air after furnace has been operating for a period of at least
220
5 minutes. As soon as limit control has shut off burners, return-air
214
opening should be unblocked to permit normal air circulation. By
209
using this method to check limit control, it can be established that
205
limit is functioning properly and operates if there is a restricted
200
return-air supply or motor failure. If limit control does not function
196
during this test, cause must be determined and corrected.
192
CHECK PRESSURE SWITCH
188
This control proves operation of draft inducer. Check switch
184
operation as follows:
180
178
1. Turn off 115-v power to furnace.
173
2. Remove main furnace door and disconnect inducer motor lead
170
wires from wire harness.
167
3. Turn on 115-v power to furnace.
164
4. Set thermostat to call for heat and wait 1 minute. When
161
pressure switch is functioning properly, hot surface ignitor
155
should NOT glow, and control center diagnostic light flashes
150
a Status Code 31. If hot surface ignitor glows when inducer
145
motor is disconnected, shut furnace down immediately. De-
termine reason pressure switch did not function properly and
correct condition.
5. Turn off 115-v power to furnace.
6. Reconnect inducer motor leads, reinstall main furnace door,
and turn on 115-v power supply.
Step 6—Checklist
1. Put away tools and instruments. Clean up debris.
2. Verify manual reset switch has continuity.
3. Verify that blower and control access doors are properly
installed.
4. Cycle test furnace with room thermostat.
5. Check operation of accessories per manufacturer's instruc-
tions.
6. Review User's Guide with owner.
7. Leave literature packet near furnace.
46
THERMOSTAT SUBBASE
TERMINALS WITH
THERMOSTAT REMOVED
HOOK-AROUND
VOLT/AMMETER
R Y W G
10 TURNS
FROM UNIT 24-VOLT
TERMINAL BLOCK
= 0.5 AMPS FOR THERMOSTAT SETTING
A80201