GAS FLOW RATE (CUBIC FEET PER HOUR)
TIME FOR | CUBIC FEET PER REVOLUTION OF |
| TIME FOR | CUBIC FEET PER REVOLUTION OF | ||||
ONE REVOLUTION |
| METER |
|
| ONE REVOLUTION |
| METER |
|
(SECONDS) | 1 | 5 | 10 |
| (SECONDS) | 1 | 5 | 10 |
24 | 150 | 750 | 1500 |
| 80 | 45 | 225 | 450 |
26 | 138 | 692 | 1385 |
| 82 | 44 | 220 | 439 |
28 | 129 | 643 | 1286 |
| 84 | 43 | 214 | 429 |
30 | 120 | 600 | 1200 |
| 86 | 42 | 209 | 419 |
32 | 113 | 563 | 1125 |
| 88 | 41 | 205 | 409 |
34 | 106 | 529 | 1059 |
| 90 | 40 | 200 | 400 |
36 | 100 | 500 | 1000 |
| 92 | 39 | 196 | 391 |
38 | 95 | 474 | 947 |
| 94 | 38 | 191 | 383 |
40 | 90 | 450 | 900 |
| 96 | 38 | 188 | 375 |
42 | 86 | 429 | 857 |
| 98 | 37 | 184 | 367 |
44 | 82 | 409 | 818 |
| 100 | 36 | 180 | 360 |
46 | 78 | 391 | 783 |
| 102 | 35 | 176 | 353 |
48 | 75 | 375 | 750 |
| 104 | 35 | 173 | 346 |
50 | 72 | 360 | 720 |
| 106 | 34 | 170 | 340 |
52 | 69 | 346 | 692 |
| 108 | 33 | 167 | 333 |
54 | 67 | 333 | 667 |
| 110 | 33 | 164 | 327 |
56 | 64 | 321 | 643 |
| 112 | 32 | 161 | 321 |
58 | 62 | 310 | 621 |
| 114 | 32 | 158 | 316 |
60 | 60 | 300 | 600 |
| 116 | 31 | 155 | 310 |
62 | 58 | 290 | 581 |
| 118 | 31 | 153 | 305 |
64 | 56 | 281 | 563 |
| 120 | 30 | 150 | 300 |
Table 11. Gas Flow Rate
after the gas valve is closed. This timing can be changed using the BLOWER OFF timing switch opposite the terminal block on the control board (See Figure 27).
Verifying Burner Operation
To verify operation of the burners, remove front door and ensure that the door switch is in the “on” position (see Figure 29). Set the thermostat above room temperature and observe the ignition se- quence. The flame can be observed through the small clear window on the burner box. The burner flame should carry over between all burners. The flames should be blue, without yellow tips. Flames should extend from each burner without lifting, curling, or floating. After verifying ignition, set the thermostat below room temperature and verify that the burner flame extinguishes completely. Replace the front door.
Verifying Operation of the Supply Air Limit Switch
To verify operation of the supply air limit switch, make sure that the blower door is in place and that there is power to the furnace. Completely block the return airflow to the furnace by install- ing a
temperature and verify that the Sequence of Operation is as described in these instructions. The supply air limit switch should function to turn off the gas valve within approximately five minutes. The circulating air and combustion blowers should continue to run when the supply air limit switch opens. Remove the
DESCRIPTION OF COMPONENTS
Figure 29 shows the location of each of the functional components described below. If any component of the furnace must be replaced, use only factory authorized replacement parts. Contact your distributor for the approved re- placement parts.
Flame Sensor – The flame sensor acts to prove that flame has carried over from the ignitor to the opposite end burner. If no flame is sensed, the furnace will be shut down automati- cally.
28