Check Safety Controls - Carrier 58MEB Installation, Start-Up, And Operating Instructions Manual

(READ following CAUTION before changing taps)
CAUTION
!
UNIT DAMAGE HAZARD
To avoid operating outside the range and avoid component
damage:
1. Never connect Speed Tap 1 (RED) to 'HEAT'.
2. Never connect Speed Tap 2 (ORANGE) to 'HEAT' on all
models except the 036040/040- -12 unit.
Table 15 – 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
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
124 29 58 145
ADJUST BLOWER OFF DELAY (HEAT MODE)
The blower off delay has 4 adjustable settings from 90 sec to 180
sec. (See Table 17.) The blower off delay jumpers are located on
the furnace control (See Fig. 36). To change the blower off delay
setting, move the jumper from one set of pins on the control to
the pins used for the desired blower off delay. Factory blower off
delay setting is 120 sec.
SET THERMOSTAT HEAT ANTICIPATOR
When using a nonelectronic thermostat, the thermostat heat
anticipator must be set to match the amp draw of the electrical
components in R-W circuit. Accurate amp draw readings can be
obtained at thermostat subbase terminals R and W. Fig. 58
illustrates the easy method of obtaining actual amp draw. The
amp reading should be taken after blower motor has started and
furnace is heating. Connect ammeter wires as shown in Fig. 58.
The thermostat anticipator should NOT be in the circuit while
measuring current. If thermostat has no subbase, the thermostat
must be disconnected from R and W wires during current
measurement. See thermostat manufacturer's instructions for
adjusting heat anticipator and for varying heating cycle length.
For an electronic thermostat, set cycle rate for 3 cycles per hour.
Table 16 – Speed Selector
COLOR
Gray
Yellow
Blue
Orange
Red
Table 17 – Blower Off Delay Jumper Positions
PINS 1 AND 2
Time (in sec) 90
Step 6—Check Safety Controls
This section covers the safety controls that must be checked
before the installation is complete. The flame sensor, gas valve,
and pressure switch were all checked in the Start-up procedure
section as part of normal operation.
CHECK PRIMARY LIMIT CONTROL
This control shuts off gas control system and energizes
air-circulating blower motor if furnace overheats. Recommended
method of checking this limit control is to gradually block off
return air after furnace has been operating for a period of at least
5 minutes. As soon as limit control has shut off burners, return-air
opening should be unblocked to permit normal air circulation. By
using this method to check limit control, it can be established that
limit is functioning properly and operates if there is a restricted
return-air duct or motor failure. If limit control does not function
during this test, cause must be determined and corrected.
CHECK PRESSURE SWITCH
This control proves operation of draft inducer. Check switch
operation as follows:
1. Turn off 115-v power to furnace.
- - 57 - -
FACTORY
SPEED SHIPPED
CONNECTION
5 Cool
4 Spare
3 Heat
2 Spare
1 Cont Fan
2 AND 3 3 AND 4 4 AND 5
120 150 180