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TABLE 14ÐGAS 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 | |
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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B.Set Temperature Rise
CAUTION: Temperature rise must be within limits specified on unit rating plate. Recommended operation is at midpoint of rise or above. Failure to follow this caution may result in condensing or overheating the heat ex- changers.
Furnace must operate within range of temperature rise specified on the unit rating plate. Determine air temperature rise as follows:
1.Place thermometers in return and supply ducts as near furnace as possible. Be sure thermometers do not see heat exchanger so that radiant heat does not affect readings. This practice is particularly important with
2.When thermometer readings stabilize, subtract
NOTE: Temperature rise can be determined for
3.This furnace is capable of automatically providing proper airflow to maintain the temperature rise within the range specified on unit rating plate. If temperature rise is outside this range, proceed as follows:
a.Check gas input for low- and
b.Check derate for altitude if applicable.
c.Check all return and supply ducts for excessive restric- tions causing static pressure greater than
Ð42Ð
d. Ensure bypass humidifier switch (BPH) setup switch
e. Check Troubleshooting Guide for
C. Set Thermostat Heat Anticipator
The thermostat heat anticipator must be set to match the amp draw of components in the
Fig. 50 illustrates an easy method of obtaining thermostat amp draw measurements. The amp reading should be taken after blower motor has started and furnace is operating in low heat.
1.To operate furnace in low heat, turn setup switch SW-2 to ON position (See Fig. 25) and connect ammeter leads across thermostat subbase R-W.
2.See thermostat manufacturer's instructions for adjusting the heat anticipator and for varying heating cycle length.
NOTE: When using an electronic thermostat, set cycle rate for 3 cycles per hr.
3.Return setup switch SW-2 to OFF position and replace thermostat on subbase.
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. 50ÐAmp Draw Check with Ammeter
CHECK SAFETY CONTROLS
I.CHECK PRIMARY LIMIT CONTROL
This control shuts off the combustion control system and energizes the
1.The recommended method of checking this limit control is to gradually block off return air after furnace has been operating for a period of at least 5 minutes.
2.As soon as limit control has shut off burners, a 33 fault code will appear on control center.
3.The
By using this method to check the limit control, it can be established that the limit is functioning properly and the furnace will operate safely if there is a restricted