Outdoor Temp; Coil Cleaning - Carrier 38TN Service Manual

OUTDOOR TEMP (°F)
55
60
65
70
75
80
85
90
95
100
105
110
115
Where dash appears, do not attempt to charge system under these conditions or refrigerant slugging may occur.
SUPERHEAT
TEMP (°F)
30.4
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
is higher than indicated or remove refrigerant if temperature is
lower. Allow a tolerance of 3°F.
Step 12—Care and Maintenance
To assure high performance and minimize possible equipment
malfunction, it is essential that maintenance be performed periodi-
cally on this equipment. The frequency with which maintenance is
performed is dependent on such factors as hrs of operation,
geographic location, and local environmental conditions.
Disconnect all electrical power to unit before performing any
maintenance or service on outdoor unit. Remember to dis-
connect power supply to air handler as this unit supplies
low-voltage power to the outdoor unit. Electric shock can
cause personal injury or death.
The minimum maintenance that should be performed on this
equipment is as follows.
Table 1—Superheat Charging Table
50 52 54 56
9 12 14 17
7 10 12 15
— 6 10 13
— — 7 10
— — — 6
— — — —
— — — —
— — — —
— — — —
— — — —
— — — —
— — — —
— — — —
Table 2—Required Vapor Temperature (°F)
VAPOR PRESSURE AT SERVICE PORT (PSIG)
32.3 34.1
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
INDOOR COIL ENTERING AIR TEMP (°F WB)
58 60 62 64
20 23 26 29
18 21 24 27
16 19 21 24
13 16 19 21
9 12 15 18
5 8 12 15
— — 8 11
— — 5 9
— — — 6
— — — —
— — — —
— — — —
— — — —
36.1 38
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
79 81
81 83
1. Check outdoor coil for cleanliness each month during the
cooling season and clean as necessary.
2. Check fan motor and blade for cleanliness each heating and
cooling season and clean as necessary.
3. Check electrical connections for tightness and controls for
proper operation each cooling season and service as necessary.
Because of possible damage to the equipment or personal
injury, maintenance should be performed by qualified person-
nel only.

COIL CLEANING

1. Remove top cover. (See Remove Top Cover in Cabinet
section of the manual.)
16
66 68 70 72
32 35 37 40
30 33 35 38
27 30 33 36
24 27 30 33
21 24 28 31
18 21 25 28
15 19 22 26
13 16 20 24
10 14 18 22
8 12 15 20
5 9 13 17
— 6 11 15
— — 8 14
40.1 42.2 44.4
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
83 85 87
85 87 89
74 76
42 45
40 43
38 41
36 39
34 37
31 35
30 33
27 31
25 29
23 27
22 26
20 25
18 23
46.6
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
85
87
89
91