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Table 8–GAS 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 |
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10 | 360 | 720 | 1800 | 50 | 72 | 144 | 360 |
11 | 327 | 655 | 1636 | 51 | 71 | 141 | 355 |
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12 | 300 | 600 | 1500 | 52 | 69 | 138 | 346 |
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13 | 277 | 555 | 1385 | 53 | 68 | 136 | 340 |
14 | 257 | 514 | 1286 | 54 | 67 | 133 | 333 |
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15 | 240 | 480 | 1200 | 55 | 65 | 131 | 327 |
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16 | 225 | 450 | 1125 | 56 | 64 | 129 | 321 |
17 | 212 | 424 | 1059 | 57 | 63 | 126 | 316 |
18 | 200 | 400 | 1000 | 58 | 62 | 124 | 310 |
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19 | 189 | 379 | 947 | 59 | 61 | 122 | 305 |
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20 | 180 | 360 | 900 | 60 | 60 | 120 | 300 |
21 | 171 | 343 | 857 | 62 | 58 | 116 | 290 |
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22 | 164 | 327 | 818 | 64 | 56 | 112 | 281 |
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23 | 157 | 313 | 783 | 66 | 54 | 109 | 273 |
24 | 150 | 300 | 750 | 68 | 53 | 106 | 265 |
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25 | 144 | 288 | 720 | 70 | 51 | 103 | 257 |
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26 | 138 | 277 | 692 | 72 | 50 | 100 | 250 |
27 | 133 | 267 | 667 | 74 | 48 | 97 | 243 |
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28 | 129 | 257 | 643 | 76 | 47 | 95 | 237 |
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29 | 124 | 248 | 621 | 78 | 46 | 92 | 231 |
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30 | 120 | 240 | 600 | 80 | 45 | 90 | 225 |
31 | 116 | 232 | 581 | 82 | 44 | 88 | 220 |
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32 | 113 | 225 | 563 | 84 | 43 | 86 | 214 |
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33 | 109 | 218 | 545 | 86 | 42 | 84 | 209 |
34 | 106 | 212 | 529 | 88 | 41 | 82 | 205 |
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35 | 103 | 206 | 514 | 90 | 40 | 80 | 200 |
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36 | 100 | 200 | 500 | 92 | 39 | 78 | 196 |
37 | 97 | 195 | 486 | 94 | 38 | 76 | 192 |
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38 | 95 | 189 | 474 | 96 | 38 | 75 | 188 |
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39 | 92 | 185 | 462 | 98 | 37 | 74 | 184 |
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40 | 90 | 180 | 450 | 100 | 36 | 72 | 180 |
41 | 88 | 176 | 439 | 102 | 35 | 71 | 178 |
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42 | 86 | 172 | 429 | 104 | 35 | 69 | 173 |
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43 | 84 | 167 | 419 | 106 | 34 | 68 | 170 |
44 | 82 | 164 | 409 | 108 | 33 | 67 | 167 |
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45 | 80 | 160 | 400 | 110 | 33 | 65 | 164 |
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46 | 78 | 157 | 391 | 112 | 32 | 64 | 161 |
47 | 76 | 153 | 383 | 116 | 31 | 62 | 155 |
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48 | 75 | 150 | 375 | 120 | 30 | 60 | 150 |
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49 | 73 | 147 | 367 |
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To change the blower off delay setting, move the jumper from one set of pins on the control to the pins used for the selected blower off delay. Factory off delay setting is 120 sec.
Step 4—Check Safety Controls
The flame sensor, gas valve, and pressure switch were all checked in the
1.Check Main Limit Switches
This control shuts off combustion control system and ener- gizes
a.Run furnace for at least 5 minutes.
b.Gradually block off return air with a piece of cardboard or sheet metal until the limit trips.
c.Unblock return air to permit normal circulation.
THERMOSTAT SUBBASE TERMINALS WITH THERMOSTAT REMOVED (ANITICIPATOR, CLOCK, ETC.,
MUST BE OUT OF CIRCUIT.)
AMMETER
R Y W G
10 TURNS
FROM UNIT
CONTROL TERMINALS
EXAMPLE: | 5.0 AMPS ON AMMETER | = | 0.5 AMPS FOR THERMOSTAT | |
10 TURNS AROUND JAWS | ANTICIPATOR SETTING | |||
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| A96316 |
Fig. 42—Amp Draw Check With Ammeter
d.Burners will
2.Check draft safeguard switch.
The purpose of this control is to permit the safe shutdown of the furnace during certain blocked vent conditions.
a.Verify vent pipe is cool to the touch.
b.Disconnect power to furnace and remove vent connector from furnace vent elbow.
c.Restore power to furnace and set room thermostat above room temperature.
d.After normal
e.Furnace should cycle off within 2 minutes.
f.Remove blockage and reconnect vent pipe to furnace vent elbow.
g.Switch will
h.If control board locks out furnace, cycle 115 vac power to reset control.
3.Check Pressure Switch(es)
This control proves operation of the draft inducer blower.
a.Turn off
b.Disconnect inducer motor lead wires from wire harness.
c.Turn on
d.Set thermostat to ″ call for heat″ and wait 1 minute. When pressure switch is functioning properly, hot surface igniter should NOT glow and control diagnostic light flashes a status code 32. If hot surface igniter glows when inducer motor is disconnected, shut down furnace immediately.
e.Determine reason pressure switch did not function properly and correct condition.
f.Turn off
g.Reconnect inducer motor wires, replace outer door, and turn on
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