BURNER FLAME'-_ _ BURNER
MANIFOLD J
Fig. 48--Burner Flame
Table 13--Gas
Rate {Cu Ft/Hr)
SECONDS SIZE OF TEST DIAL SECONDS
FOR 1 I 2 5 FOR 1
REVOLUTION cuff cu fl cu fl REVOLUTION
10 360 720 1800 50
11 327 655 1636 51
12 300 600 1500 52
13 277 555 1385 53
14 257 514 1286 54
15 240 480 1200 55
16 225 450 1125 56
17 212 424 1059 57
18 200 400 1000 58
19 189 379 947 59
20 180 360 900 60
21 171 343 857 62
22 164 327 818 64
23 157 313 783 66
24 150 300 750 68
25 144 288 720 70
26 138 277 692 72
A89020
27 133 267 667 74
28 129 257 643 76
29 124 248 621 78
30 120 240 600 80
31 116 232 581 82
32 113 225 563 84
33 109 218 545 86
34 106 212 529 88
35 103 206 514 90
36 100 200 500 92
37 97 195 486 94
38 95 189 474 96
39 92 185 462 98
40 90 180 450 100
41 88 176 439 102
42 86 172 429 104
43 84 167 419 106
44 82 164 409 108
45 80 160 400 110
46 78 157 391 112
47 76 153 383 116
48 75 150 375 120
49 73 147 367 124
SIZE OF TEST DIAL
1 2 5
cu fl cu fl cu fl
72 144 360
71 141 355
69 138 346
68 136 340
67 133 333
65 131 327
64 129 321
63 126 316
62 124 310
61 122 305
60 120 300
58 116 290
56 112 281
54 109 273
53 106 265
51 103 257
50 100 250
48 97 243
47 95 237
46 92 231
45 90 225
44 88 220
43 86 214
42 84 209
41 82 205
40 80 200
39 78 196
38 76 192
38 75 188
37 74 184
36 72 180
35 71 178
35 69 173
34 68 170
33 67 167
33 65 164
32 64 161
31 62 155
30 60 150
29 58 145
EXAMPLE: (0 2000 fi altitude)
Furnace input fi'om rating plate is 100,000 Bmh.
Bm heating input Bmicu ft X cu ftihr
Heating value of gas 975 Btuicu 1:i
Time for 1 revolution of 2-cu fl dial 70 sec
Gas rate 103 cu ftihr (f?om Table 11)
Bm heating input 103 X 975 100,425 Btuh
In this example, the orifice size and manifbld pressure
adjustment is within !2 percent of the fl/mace input rate.
SET TEMPERATURE RISE
[NIT DAMAGE HAZARD
Failure to fbllow this caudon may result in overheating d-xe
heat exchangers or condensing flue gases in heat exchanger
areas not designed for condensate.
Temperature rise must be within limits specified on hlmace
rating plate. Recommended operation is at mi@oint of rise
range or slightly above.
Determine and ac[iust air temperature rise as fbllows:
1. Place thermometers in return and supply ducts as close to
fi/rnace as possible Be sure thermon_eters do not see heat
exchanger so that radiant heat does not affect readings This
practice is particularly important with stlaight-run ducts.
2. When tlaern_ometer readings stabilize, subtract return-air tern:
perature fl'om supply-air temperature to detemaine air tem-
perature rise.
3. Acliust temperature rise by adjusting blower speed. Increase
blower speed to redtlce temperature rise. Decrease blower
speed to increase temperature rise.
ELECTRICAL SHOCK HAZARD
Failure to %llow this warning could result in personal injury
or death.
Disconnect 115-v electrical power before changing speed tap
4. To change blower motor speed selections for heating mode,
remove blower motor lead J:'rom control center HEAT termi-
nal. (See Fig 33) Select desired blower motor speed lead
fi'om 1 of the other motor leads and relocate it to HEAT
terminal See Table 14 for lead color identification. Reconnect
original lead on SPARE terminal
Follow this same procedure %r proper selection of (OOL
speed selection
BLOWER OFF DELAY (HEAT MODE)
The blower offdelay has 4 adjustable settings h'om 90 sec to 180
sec. (See Table 15.) The blower off delay jumpers are located on
the fl/rnace control board (See Fig. 33) To change the blower off
Table 14--Speed Selector
FACTORY-
COLOR SPEED SHIPPED
CONNECTION
Black High Cool
Yellow (When Present) Medium High Spare
Blue Medium Low Heat
Red Low Spare
White Common Corn
44
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