International comfort products F8MVL Installation Instructions Manual page 40

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 − Low Speed and High
Speed Cooling
The ECM blower can be adjusted for a range of airflow for
SECONDS G
FOR 1 REVOLUTION
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
40
Table 12 – Gas Rate (CU ft./hr)
SIZE OF TEST DIAL
1 Cu Ft. 2 Cu Ft. 5 Cu Ft.
360 720
327 655
300 600
277 555
257 514
240 480
225 450
212 424
200 400
189 379
180 360
171 343
164 327
157 313
150 300
144 288
138 277
133 267
129 257
124 248
120 240
116 232
113 225
109 218
106 212
103 206
100 200
97 195
95 189
92 185
90 180
88 176
86 172
84 167
82 164
80 160
78 157
76 153
75 150
73 147
Specifications are subject to change without notice.
Low Speed or High Speed cooling. See Table 10 Air Deliv-
ery − CFM (With Filter ). Depending on the model size, the
cooling airflow can be adjusted from 1.5 tons nominal cool-
ing 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
A/C SW2−6, SW2−7 and SW2−8 or CF (SW2−3, SW2−4,
and SW2−5) either ON or OFF. Select the required airflow
from Table 10. Table 10 is based on 350 CFM per ton. For
airflow at 400 CFM per ton, turn Setup SW1−5 ON (See
Table 9 and Figure 26 and Figure 55)
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 continuous fan
speeds different than heating or cooling fan speed. See
Table 10 Air Delivery − CFM (With Filter). Select the re-
quired continuous fan airflow from Table 10.
The continuous fan speed is also the fan speed for low
speed cooling when furnace is used with a 2−speed cool-
ing unit. Adjust the Continuous Fan CFM to match the
airflow required for low speed cooling. Select the required
airflow from Table 10. For airflow at 400 CFM per ton, turn
Setup SW1−5 ON (See Table 10) The airflow selected for
low speed cooling will also be the airflow used for continu-
ous fan.
SECONDS
FOR 1 REVOLUTION
1800 50
1636 51
1500 52
1385 53
1286 54
1200 55
1125 56
1059 57
1000 58
947 59
900 60
857 62
818 64
783 66
750 68
720 70
692 72
667 74
643 76
621 78
600 80
581 82
563 84
545 86
529 88
514 90
500 92
486 94
474 96
462 98
450 100
439 102
429 104
419 106
409 108
400 110
391 112
383 116
375 120
367
SIZE OF TEST DIAL
1 Cu Ft. 2 Cu Ft.
72 144
71 141
69 138
68 136
67 133
65 131
64 129
63 126
62 124
61 122
60 120
58 116
56 112
54 109
53 106
51 103
50 100
48 97
47 95
46 92
45 90
44 88
43 86
42 84
41 82
40 80
39 78
38 76
38 75
37 74
36 72
35 71
35 69
34 68
33 67
33 65
32 64
31 62
30 60
441 01 2122 01
5 Cu Ft.
360
355
346
340
333
327
321
316
310
305
300
290
281
273
265
257
250
243
237
231
225
220
214
209
205
200
196
192
188
184
180
178
173
170
167
164
161
155
150