37
441 01 2121 01
l. Proceed to Step 6, “Set Blower Off Delay” before
installing blower access door.
7. Set Blower Off Delay
a. Remove blower access door if installed.
b. Turn Dip switch SW−7 or SW−8 ON or OFF for de-
sired blower off delay. (See Table 10 and Figure 26
and Figure 56)
8. Set thermostat heat anticipator.
a. Mechanical thermostat. Set thermostat heat anticip-
ator to match the amp. draw of the electrical com-
ponents in the R−W/W1 circuit. Accurate amp. draw
readings can be obtained at the wires normally con-
nected to thermostat subbase terminals, R and W.
The thermostat anticipator should NOT be in the
circuit while measuring current.
(1.) Set SW1−2 switch on furnace control board to
ON.
(2.) Remove thermostat from subbase or from wall.
(3.) Connect an amp. meter as shown in Figure 50.
across the R and W subbase terminals or R
and W wires at wall.
(4.) Record amp. draw across terminals when fur-
nace is in low heat and after blower starts.
(5.) Set heat anticipator on thermostat per thermo-
stat instructions and install on subbase or wall.
(6.) Turn SW1−2 switch OFF.
(7.) Install blower access door.
b. Electronic thermostat: Set cycle rate for 3 cycles
per hr.
9. Set Airflow for Air Conditioning −Single Stage and High
Stage Cooling
The ECM blower can be adjusted for a range of airflow
for Low Speed or High Speed cooling. See Table 5−Air
Delivery − CFM (With Filter ). Depending on the model
size, the cooling airflow can be adjusted from 1.5 tons
nominal cooling to 3.5, to 4 or 2 to 6 tons of nominal
cooling based on 350 cfm ton.
The cooling airflow is adjusted by turning Setup
switches SW2−1, SW2−2 and SW2−3 either ON or
OFF. Select the required airflow from Figure 55.
Figure 55 is based on 350 CFM per ton. For airflow at
400 CFM per ton, turn Setup SW1−5 ON (See Table 10
and Figure 26 and Figure 56)
NOTE: 6 ton airflow will truncate at 2200 cfm on applicable
models. For a complete explanation of cooling airflow, refer to
the section titled “Sequence of Operation.”
10. Set Airflow For Continuous Fan/Low Speed Cooling
Airflow The ECM blower motor can be adjusted for con-
tinuous fan speeds different than heating or cooling fan
speed. See Table 5 − Air Delivery − CFM (With Filter).
Select the required continuous fan airflow from
Figure 55.
The continuous fan speed is also the fan speed for low
speed cooling when furnace is used with a 2−speed
cooling unit. Adjust the Continuous Fan CFM to match
the airflow required for low speed cooling. Select the
required airflow from Figure 53. For airflow at 400 CFM
per ton, turn Setup SW1−5 ON (See Figure 55) The air-
flow selected for low speed cooling will also be the air-
flow used for continuous fan.
Table 13 – Gas Rate (CU ft./hr)
SECONDS G
FOR 1 REVOLUTION
SIZE OF TEST DIAL SECONDS
FOR 1 REVOLUTION
SIZE OF TEST DIAL
1 Cu Ft. 2 Cu Ft. 5 Cu Ft. 1 Cu Ft. 2 Cu Ft. 5 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 11 6 290
22 164 327 818 64 56 11 2 281
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 11 6 232 581 82 44 88 220
32 11 3 225 563 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 11 0 33 65 164
46 78 157 391 11 2 32 64 161
47 76 153 383 11 6 31 62 155
48 75 150 375 120 30 60 150
49 73 147 367
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