Table 9ÐGas Rate (Cu Ft/Hr)
SECONDS | SIZE OF TEST DIAL | SECONDS | SIZE OF TEST DIAL | ||||
FOR 1 | 1 | 2 | 5 | FOR 1 | 1 | 2 | 5 |
REVOLUTION | cu ft | cu ft | cu ft | REVOLUTION | cu ft | cu ft | cu ft |
10 | 360 | 720 | 1800 | 50 | 72 | 144 | 360 |
11 | 327 | 655 | 1636 | 51 | 71 | 141 | 355 |
12 | 300 | 600 | 1500 | 52 | 69 | 138 | 346 |
13 | 277 | 555 | 1385 | 53 | 68 | 136 | 340 |
14 | 257 | 514 | 1286 | 54 | 67 | 133 | 333 |
15 | 240 | 480 | 1200 | 55 | 65 | 131 | 327 |
16 | 225 | 450 | 1125 | 56 | 64 | 129 | 321 |
17 | 212 | 424 | 1059 | 57 | 63 | 126 | 316 |
18 | 200 | 400 | 1000 | 58 | 62 | 124 | 310 |
19 | 189 | 379 | 947 | 59 | 61 | 122 | 305 |
20 | 180 | 360 | 900 | 60 | 60 | 120 | 300 |
21 | 171 | 343 | 857 | 62 | 58 | 116 | 290 |
22 | 164 | 327 | 818 | 64 | 56 | 112 | 281 |
23 | 157 | 313 | 783 | 66 | 54 | 109 | 273 |
24 | 150 | 300 | 750 | 68 | 53 | 106 | 265 |
25 | 144 | 288 | 720 | 70 | 51 | 103 | 257 |
26 | 138 | 277 | 692 | 72 | 50 | 100 | 250 |
27 | 133 | 267 | 667 | 74 | 48 | 97 | 243 |
28 | 129 | 257 | 643 | 76 | 47 | 95 | 237 |
29 | 124 | 248 | 621 | 78 | 46 | 92 | 231 |
30 | 120 | 240 | 600 | 80 | 45 | 90 | 225 |
31 | 116 | 232 | 581 | 82 | 44 | 88 | 220 |
32 | 113 | 225 | 563 | 84 | 43 | 86 | 214 |
33 | 109 | 218 | 545 | 86 | 42 | 84 | 209 |
34 | 106 | 212 | 529 | 88 | 41 | 82 | 205 |
35 | 103 | 206 | 514 | 90 | 40 | 80 | 200 |
36 | 100 | 200 | 500 | 92 | 39 | 78 | 196 |
37 | 97 | 195 | 486 | 94 | 38 | 76 | 192 |
38 | 95 | 189 | 474 | 96 | 38 | 75 | 188 |
39 | 92 | 185 | 462 | 98 | 37 | 74 | 184 |
40 | 90 | 180 | 450 | 100 | 36 | 72 | 180 |
41 | 88 | 176 | 439 | 102 | 35 | 71 | 178 |
42 | 86 | 172 | 429 | 104 | 35 | 69 | 173 |
43 | 84 | 167 | 419 | 106 | 34 | 68 | 170 |
44 | 82 | 164 | 409 | 108 | 33 | 67 | 167 |
ON AND
OFF SWITCH
GAS
PRESSURE
REGULATOR
ADJUSTMENT
INLET
PRESSURE TAPMANIFOLD
PRESSURE TAP
A95618
Fig. 18ÐRedundant Automatic Gas Control Valve
BURNER FLAME
BURNER
45 | 80 | 160 | 400 | 110 | 33 | 65 | 164 | |
46 | 78 | 157 | 391 | |||||
112 | 32 | 64 | 161 | |||||
47 | 76 | 153 | 383 | |||||
116 | 31 | 62 | 155 | |||||
48 | 75 | 150 | 375 | |||||
120 | 30 | 60 | 150 | |||||
49 | 73 | 147 | 367 | |||||
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MANIFOLD
Fig. 19ÐBurner Flame
A89020
EXAMPLE: (0Ð2000 ft altitude)
Btu heating input = Btu/cu ft X cu ft/hr Heating value of gas = 1050 Btu/cu ft Time for 1 revolution of
Btu heating input = 88 X 1050 = 92,400 Btuh
In this example, the orifice size and manifold pressure adjustment is within ±2 percent of the furnace input rate.
2.Set temperature rise.
Furnace must operate within range of temperature rise speci- fied on the unit rating plate. Determine the air temperature rise as follows.
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 does not affect thermometer readings. This is particularly important with
b.When thermometer readings stabilize, subtract
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. Failure to follow this warning could result in personal injury.
d.To change blower motor speed selections for heating mode remove blower motor lead from control board HEAT terminal. (See Fig. 14.) Select desired blower motor speed lead from 1 of the other terminals and relocate it to HEAT terminal. See Table 10 for lead color identification. Recon- nect original lead on SPARE terminal.
Follow this same procedure for proper selection of COOL speed selection.
If Model 58ZAV
→Table 10ÐSpeed Selector
COLOR | SPEED | FACTORY- | |
ATTACHED TO | |||
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Black | High | COOL | |
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Yellow (When present) | SPARE | ||
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Blue | HEAT | ||
Red | Low | SPARE | |
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White | Common | L2/COM | |
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