INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS
For heating and cooling operation, the recommended airflow
is 350 to 450 cfm for each 12,000 Btuh (165 L/s to 212 for
each 3.5 kW) of rated cooling capacity. For units with
optional electric heat, the airflow must not be reduced below
the levels stated in Table 2.
Table 5 and Table 6 show both heating and cooling airflows at
various external static pressures. Refer to these tables to determine
the airflow for the system being installed.
NOTE:
Be sure that all supply-and return-air grilles are open, free
from obstructions, and adjusted properly.
Airflow can be changed by changing the lead connection of the
blower motor.
To change the speed of the indoor fan motor (IFM), remove the fan
motor speed leg lead from the indoor fan contactor (IFC). To
change the speed, remove and replace with lead for desired blower
motor speed.
Insulate the removed lead
to avoid contact with
chassis parts.
For 400-v Motors—The motor leads are color coded as follows:
3-SPEED
Black = high
White = common
Blue = medium
Red = low
2–SPEED
Black = high
Red = low
Yellow = common
To change the speed of the indoor fan motor (IFM), remove fan
motor speed lead from the indoor fan contactor (IFC) and replace
Table 12—Superheat Charging Table (Metric)
OUTDOOR
TEMP
(°C)
EVAPORATOR ENTERING AIR TEMPERATURE (°C WB)
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
13
5.0
6.7
7.8
9.4
11.1
11.9
12.8
14.4
16.1
17.8
19.4
20.6
22.2
23.3
25.0
16
3.9
5.6
6.7
8.3
10.0
10.8
11.7
13.3
15.0
16.7
18.3
20.0
21.1
22.2
23.9
18
–
3.3
5.6
7.2
8.9
9.7
10.6
11.7
13.3
15.0
16.7
18.3
20.0
21.1
22.8
21
–
–
3.9
5.6
7.2
8.1
8.9
10.6
11.7
13.3
15.0
16.7
18.3
20.0
21.7
24
–
–
–
3.3
5.0
5.8
6.7
8.3
10.0
11.7
7.8
15.6
17.2
18.9
20.6
27
–
–
–
–
2.8
3.6
4.4
6.7
8.3
10.0
11.7
13.9
15.6
17.2
19.4
29
–
–
–
–
–
–
–
4.4
6.1
8.3
10.6
12.2
14.4
16.7
18.3
32
–
–
–
–
–
–
–
2.8
5.0
7.2
8.9
11.1
13.3
15.0
17.2
35
–
–
–
–
–
–
–
–
3.3
5.6
7.8
10.0
12.2
13.9
16.1
38
–
–
–
–
–
–
–
–
–
4.4
6.7
8.3
11.1
12.8
15.0
41
–
–
–
–
–
–
–
–
–
2.8
5.0
7.2
9.4
12.2
14.4
43
–
–
–
–
–
–
–
–
–
–
3.3
6.1
8.3
11.1
13.9
46
–
–
–
–
–
–
–
–
–
–
–
4.4
7.8
10.0
12.8
Where a dash (–) appears, do not attempt to charge system under these conditions, or refrigerant slugging may occur. Charge must be weighed in.
NOTE: Superheat °C is at low-side service port.
Table 13—Required Suction-Line Temperature (English)
SUPERHEAT
TEMP
(°F)
SUCTION PRESSURE AT SERVICE PORT (PSIG)
61.5
64.2
67.1
70.0
73.0
76.0
79.2
82.4
85.7
0
35
37
39
41
43
45
47
49
51
2
37
39
41
43
45
47
49
51
53
4
39
41
43
45
47
49
51
53
55
6
41
43
45
47
49
51
53
55
57
8
43
45
47
49
51
53
55
57
59
10
45
47
49
51
53
55
57
59
61
12
47
49
51
53
55
57
59
61
63
14
49
51
53
55
57
59
61
63
65
16
51
53
55
57
59
61
63
65
67
18
53
55
57
59
61
63
65
67
69
20
55
57
59
61
63
65
67
69
71
22
57
59
61
63
65
67
69
71
73
24
59
61
63
65
67
69
71
73
75
26
61
63
65
67
69
71
73
75
77
28
63
65
67
69
71
73
75
77
79
30
65
67
69
71
73
75
77
79
81
32
67
69
71
73
75
77
79
81
83
34
69
71
73
75
77
79
81
83
85
36
71
73
75
77
79
81
83
85
87
38
73
75
77
79
81
83
85
87
89
40
75
77
79
81
83
85
87
89
91
19
Содержание 50JZ 024-060
Страница 13: ...Fig 14 Wiring Schematics C02004 13...
