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

PILOT FLAME
MANIFOLD
Fig. 13—Burner Flame
Table 7—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
a. Place duct thermometers in return and supply ducts as near
furnace as possible. Be sure thermometers do not "see" heat
exchangers so that radiant heat will not affect thermometer
readings. This is particularly important with straight-run
ducts.
BURNER FLAME
BURNER
A84076
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
b. When thermometer readings stabilize, subtract return-air
temperature from supply-air temperature to determine tem-
perature rise.
c. Adjust air temperature rise by adjusting blower speed.
Increase blower speed to reduce temperature rise. Decrease
blower speed to increase temperature rise.
Disconnect the electrical power before changing the speed
tap. A failure to follow this warning could result in personal
injury.
d. To change motor speed taps, remove the motor tap lead and
relocate it on the desired terminal on the plug-in terminal
block/speed selector located on the blower housing. (See
Table 9.)
Table 8—Canadian Orifice Size
GAS
Natural
Propane
SPEED
Common
High
Med-High
5
Med-Low
cu ft
Low
360
355
* White wire from control box to common; black wire from control box to cooling
346
speed selection; red wire from control box to heating and constant fan speed
340 selection.
333
327
321
316
Recheck the temperature rise. It must be within the limits
310
specified on the unit rating plate. Recommended operation is
305
at midpoint of rise or above.
300
290
3. Set thermostat heat anticipator
281
273
The thermostat heat anticipation must be set to match the amp
265
draw of the electrical components in the R-W circuit. Accurate
257
amp draw readings can be obtained at thermostat subbase
250
243
terminals R and W. Fig. 14 illustrates an easy method of
237
obtaining the actual amp draw. The amp reading should be
231
taken after the blower motor has started. See the thermostat
225
220
manufacturer's instructions for adjusting the heat anticipator
214
and for varying the heating cycle length.
209
NOTE: When using an electronic thermostat, set cycle rate for 3
205
200 cycles per hr.
196

CHECK SAFETY CONTROLS

192
188
1. Check operation of gas shut-off control for 100 percent
184
shutoff.
180
178 NOTE: The furnace pilot must be lit so the thermocouple
173
energizes the thermal magnet circuit of gas valve GV, which
170
permits gas flow to the remaining portion of the valve.
167
If the pilot flame is extinguished, the thermocouple will no
164
161
longer energize the thermal magnet circuit of the gas valve.
155
Gas flow to the pilot and main burners will cease until the pilot
150
is manually relit.
a. With furnace operating, unscrew pilot thermocouple lead
from gas valve. The pilot and main burner gas must shut
off. No gas should flow through valve.
b. After valve is found to operate satisfactorily, reconnect
thermocouple to gas valve (fingertight position only).
12
SEA LEVEL HIGH ALTITUDE
0—2000 2001—4500 FT
44
54
Table 9—Speed Selector
TAP NO.*
45
55
C
1
2
3
4