Indoor Airflow And Airflow Adjustments - Carrier 50JZ Installation, Start-Up And Service Instructions Manual

OUTDOOR
TEMP
10 11
(°C)
13 5.0 6.7
16 3.9 5.6
18 – 3.3
21 – –
24 – –
27 – –
29 – –
32 – –
35 – –
38 – –
41 – –
43 – –
46 – –
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.
SUPERHEAT
TEMP
61.5
(°F)
0 35
2 37
4 39
6 41
8 43
10 45
12 47
14 49
16 51
18 53
20 55
22 57
24 59
26 61
28 63
30 65
32 67
34 69
36 71
38 73
40 75

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.
Table 12—Superheat Charging Table (Metric)
EVAPORATOR ENTERING AIR TEMPERATURE (°C WB)
12 13 14 15
7.8 9.4 11.1 11.9
6.7 8.3 10.0 10.8
5.6 7.2 8.9 9.7
3.9 5.6 7.2 8.1
– 3.3 5.0 5.8
– – 2.8 3.6
– – – –
– – – –
– – – –
– – – –
– – – –
– – – –
– – – –
Table 13—Required Suction-Line Temperature (English)
SUCTION PRESSURE AT SERVICE PORT (PSIG)
64.2 67.1
37 39
39 41
41 43
43 45
45 47
47 49
49 51
51 53
53 55
55 57
57 59
59 61
61 63
63 65
65 67
67 69
69 71
71 73
73 75
75 77
77 79
16 17 18 19
12.8 14.4 16.1 17.8
11.7 13.3 15.0 16.7
10.6 11.7 13.3 15.0
8.9 10.6 11.7 13.3
6.7 8.3 10.0 11.7
4.4 6.7 8.3 10.0
– 4.4 6.1 8.3
– 2.8 5.0 7.2
– – 3.3 5.6
– – – 4.4
– – – 2.8
– – – –
– – – –
70.0 73.0 76.0
41 43 45
43 45 47
45 47 49
47 49 51
49 51 53
51 53 55
53 55 57
55 57 59
57 59 61
59 61 63
61 63 65
63 65 67
65 67 69
67 69 71
69 71 73
71 73 75
73 75 77
75 77 79
77 79 81
79 81 83
81 83 85
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
19
20 21 22 23
19.4 20.6 22.2 23.3
18.3 20.0 21.1 22.2
16.7 18.3 20.0 21.1
15.0 16.7 18.3 20.0
7.8 15.6 17.2 18.9
11.7 13.9 15.6 17.2
10.6 12.2 14.4 16.7
8.9 11.1 13.3 15.0
7.8 10.0 12.2 13.9
6.7 8.3 11.1 12.8
5.0 7.2 9.4 12.2
3.3 6.1 8.3 11.1
– 4.4 7.8 10.0
79.2 82.4
47 49
49 51
51 53
53 55
55 57
57 59
59 61
61 63
63 65
65 67
67 69
69 71
71 73
73 75
75 77
77 79
79 81
81 83
83 85
85 87
87 89
24
25.0
23.9
22.8
21.7
20.6
19.4
18.3
17.2
16.1
15.0
14.4
13.9
12.8
85.7
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
85
87
89
91