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Required Subcooling oF (oC)
Outdoor Ambient Temperature
Model Size
75 (24)
82 (28)
024
10.3 ( 5.7 )
9.8 ( 5.4 )
030
9.3 ( 5.2 )
8.8 ( 4.9 )
036
17.6 ( 9.8 )
16.8 ( 9.3 )
16.5 ( 9.2 )
042
12.8 ( 7.1 )
12.7 ( 7.1 )
12.7 ( 7.1 )
048
17.5 ( 9.7 )
16.9 ( 9.4 )
16.6 ( 9.2 )
060
13.7 ( 7.6 )
13 ( 7.2 )
Charging Procedure
1- Measure Discharge line pressure by attaching a gauge to the service port.
2- Measure the Liquid line temperature by attaching a temperature sensing
device to it.
3- Insulate the temperature sensing device so that the Outdoor Ambient
doesn't affect the reading.
4- Refer to the required Subcooling in the table based on the model size and
the Outdoor Ambient temperature.
5- Interpolate if the Outdoor ambient temperature lies in between the table
values. Extrapolate if the temperature lies beyond the table range.
6- Find the Pressure Value in the table corresponding to the the measured
Pressure of the Compressor Discharge line.
7- Read across from the Pressure reading to obtain the Liquid line
temperature for a required Subcooling
8- Add Charge if the measured temperature is higher than the table value.
50XZ500174
5. Turn off power to outdoor and reconnect fan motor lead to
OF2 on control board after above forced defrost cycle.
MAINTENANCE
To ensure continuing high performance, and to minimize the
possibility of premature equipment failure, periodic maintenance
must be performed on this equipment. This heat pump unit should
be inspected at least once each year by a qualified service person.
To troubleshoot unit, refer to Table 7.
NOTE TO EQUIPMENT OWNER: Consult your local dealer
about the availability of a maintenance contract.
WARNING: The ability to properly perform mainte-
nance on this equipment requires certain expertise, me-
chanical skills, tools and equipment. If you do not possess
these, do not attempt to perform any maintenance on this
equipment, other than those procedures recommended in
the User's Manual. FAILURE TO HEED THIS WARN-
ING COULD RESULT IN SERIOUS INJURY OR
DEATH AND POSSIBLE DAMAGE TO THIS EQUIP-
MENT.
85 (29)
95 (35)
105 (41)
Pressure
(psig)
9.4 ( 5.2 )
9 ( 5 )
8.6 ( 4.7 )
189
8.6 ( 4.8 )
7.8 ( 4.3 )
7 ( 3.9 )
196
15.4 ( 8.6 )
14.3 ( 7.9 )
203
12.6 ( 7 )
12.6 ( 7 )
210
15.7 ( 8.7 )
14.8 ( 8.2 )
217
13 ( 7.2 )
14.5 ( 8.1 )
11.5 ( 6.4 )
224
231
238
245
252
260
268
276
284
292
300
309
318
327
336
345
354
364
374
384
394
404
414
424
434
444
454
464
474
484
494
504
514
524
534
Fig. 27—Cooling Charging Table-Subcooling
Required Liquid Line Temperature for a Specific Subcooling (R-410A)
o
Required Subcooling (
F)
5
10
15
20
25
61
56
51
46
41
63
58
53
48
43
66
61
56
51
46
68
63
58
53
48
70
65
60
55
50
72
67
62
57
52
74
69
64
59
54
76
71
66
61
56
77
72
67
62
57
79
74
69
64
59
81
76
71
66
61
83
78
73
68
63
85
80
75
70
65
87
82
77
72
67
89
84
79
74
69
91
86
81
76
71
93
88
83
78
73
95
90
85
80
75
97
92
87
82
77
99
94
89
84
79
101
96
91
86
81
103
98
93
88
83
105
100
95
90
85
107
102
97
92
87
108
103
98
93
88
110
105
100
95
90
112
107
102
97
92
114
109
104
99
94
116
111
106
101
96
118
113
108
103
98
119
114
109
104
99
121
116
111
106
101
123
118
113
108
103
124
119
114
109
104
126
121
116
111
106
127
122
117
112
107
129
124
119
114
109
131
126
121
116
111
132
127
122
117
112
134
129
124
119
114
WARNING: Failure to follow these warnings could
result in serious injury or death:
1. Turn off electrical power to the unit before performing
any maintenance or service on this unit.
2. Use extreme caution when removing panels and parts.
As with any mechanical equipment, personal injury
can result from sharp edges.
3. Never place anything combustible either on, or in
contact with, the unit.
CAUTION: Errors made when reconnecting wires may
cause improper and dangerous operation. Label all wires
prior to disconnecting when servicing.
The minimum maintenance requirements for this equipment are as
follows:
1. Inspect air filter(s) each month. Clean or replace when
necessary.
2. Inspect indoor coil, drain pan, and condensate drain each
cooling season for cleanliness. Clean when necessary.
3. Inspect blower motor and wheel for cleanliness each
cooling season. Clean when necessary.
4. Check electrical connections for tightness and controls for
proper operation each cooling season. Service when neces-
sary.
—23—
o
Required Subcooling (
C)
Pressure
(kPa)
3
6
8
11
1303
16
13
11
8
1351
17
15
12
9
1399
19
16
13
10
1448
20
17
14
11
1496
21
18
15
13
1544
22
19
16
14
1593
23
20
18
15
1641
24
21
19
16
1689
25
22
20
17
1737
26
23
21
18
1792
27
25
22
19
1848
29
26
23
20
1903
30
27
24
21
1958
31
28
25
22
2013
32
29
26
23
2068
33
30
27
24
2130
34
31
28
26
2192
35
32
29
27
2254
36
33
31
28
2316
37
34
32
29
2378
38
35
33
30
2440
39
36
34
31
2509
40
38
35
32
2578
41
39
36
33
2647
42
40
37
34
2716
44
41
38
35
2785
45
42
39
36
2854
46
43
40
37
2923
47
44
41
38
2992
48
45
42
39
3061
48
46
43
40
3130
49
47
44
41
3199
50
48
45
42
3268
51
48
46
43
3337
52
49
47
44
3406
53
50
47
45
3475
54
51
48
46
3544
55
52
49
46
3612
56
53
50
47
3681
56
54
51
48
14
5
6
8
9
10
11
12
13
14
15
16
17
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
45
C03027
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