Table of Contents
Advertisement
Required Subcooling
Model Size
75 (24)
024
10.3 (5.7)
030
NA
036
17.6 (9.8)
042
NA
048
17.5 (9.7)
060
13.7 (7.6)
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.
9- Add Charge using the service connection on the Suction line of the Compressor.
Step 4—Outdoor Fan
Keep the condenser fan free from all obstructions to ensure
proper cooling operation. Never place articles on top of the
unit. Damage to unit may result.
1. Remove 6 screws holding outdoor grille and motor to top
cover.
2. Turn motor/grille assembly upside down on top cover to
expose fan blade.
3. Inspect the fan blades for cracks or bends.
4. If fan needs to be removed, loosen setscrew and slide fan off
motor shaft.
5. When replacing fan blade, position blade so that the hub is 1/8
in. away from the motor end (1/8 in. of motor shaft will be
visible). (See Fig. 23)
6. Ensure that setscrew engages the flat area on the motor shaft
when tightening.
7. Replace grille.
Step 5—Electrical Controls and Wiring
Inspect and check the electrical controls and wiring annually. Be
sure to turn off the electrical power to the unit.
Remove access panel to locate all the electrical controls and
wiring. Check all electrical connections for tightness. Tighten all
screw connections. If any smoky or burned connections are
noticed, disassemble the connection, clean all the parts, restrip the
wire end and reassemble the connection properly and securely.
Deg F
(Deg C)
Outdoor Ambient Temperature
82 (28)
85 (29)
95 (35)
9.8 (5.4)
9.4 (5.2)
9 (5)
NA
NA
NA
16.8 (9.3)
16.5 (9.2)
15.4 (8.6)
NA
NA
NA
16.9 (9.4)
16.6 (9.2)
15.7 (8.7)
13 (7.2)
13 (7.2)
14.5 (8.1)
Fig. 27—Cooling Charging Table-Subcooling
Required Liquid Line Temperature for
a Specific Subcooling (R-410A)
Required Subcooling (Deg F)
Pressure
105 (41)
(psig)
5
10
8.6 (4.7)
NA
189
61
56
14.3 (7.9)
196
63
58
NA
203
66
61
14.8 (8.2)
210
68
63
11.5 (6.4)
217
70
65
224
72
67
231
74
69
238
76
71
245
77
72
252
79
74
260
81
76
268
83
78
276
85
80
284
87
82
292
89
84
300
91
86
309
93
88
318
95
90
327
97
92
336
99
94
345
101
96
354
103
98
364
105
100
374
107
102
384
108
103
394
110
105
404
112
107
414
114
109
424
116
111
434
118
113
444
119
114
454
121
116
464
123
118
474
124
119
484
126
121
494
127
122
504
129
124
514
131
126
524
132
127
534
134
129
After inspecting the electrical controls and wiring, replace all the
panels. Start the unit, and observe at least one complete cooling
cycle to ensure proper operation. If discrepancies are observed in
operating cycle, or if a suspected malfunction has occurred, check
each electrical component with the proper electrical instrumenta-
tion. Refer to the unit wiring label when making these checkouts.
Step 6—Refrigerant Circuit
Inspect all refrigerant tubing connections and the unit base for oil
accumulation annually. Detecting oil generally indicates a refrig-
erant leak.
If oil is detected or if low performance is suspected, leak-test all
refrigerant tubing using an electronic leak detector, or liquid-soap
solution. If a refrigerant leak is detected, refer to Check for
Refrigerant Leaks section.
If no refrigerant leaks are found and low performance is suspected,
refer to Checking and Adjusting Refrigerant Charge section.
Step 7—Indoor Airflow
The heating and/or cooling airflow does not require checking
unless improper performance is suspected. If a problem exists, be
sure that all supply- and return-air grilles are open and free from
obstructions, and that the air filter is clean. When necessary, refer
to Indoor Airflow and Airflow Adjustments section to check the
system airflow.
Step 8—Metering Devices–TXV & Accurater Piston
This unit uses 2 types of metering devices. The outdoor metering
device is a fixed orifice and is contained in the brass hex-body in
the liquid line feeding the outdoor coils. The indoor metering
device is a TXV type device.
24
Required Subcooling (Deg C)
Pressure
15
20
(kPa)
3
6
51
46
1303
13
13
53
48
1351
13
15
56
51
1399
13
16
58
53
1448
13
17
60
55
1496
13
18
62
57
1544
13
19
64
59
1593
13
20
66
61
1641
13
21
67
62
1689
13
22
69
64
1737
13
23
71
66
1792
13
25
73
68
1848
13
26
75
70
1903
13
27
77
72
1958
13
28
79
74
2013
13
29
81
76
2068
13
30
83
78
2130
13
31
85
80
2192
13
32
87
82
2254
13
33
89
84
2316
13
34
91
86
2378
13
35
93
88
2440
13
36
95
90
2509
13
38
97
92
2578
13
39
98
93
2647
13
40
100
95
2716
13
41
102
97
2785
13
42
104
99
2854
13
43
106
101
2923
13
44
108
103
2992
13
45
109
104
3061
13
46
111
106
3130
13
47
113
108
3199
13
48
114
109
3268
13
48
116
111
3337
13
49
117
112
3406
13
50
119
114
3475
13
51
121
116
3544
13
52
122
117
3612
13
53
124
119
3681
13
54
8
11
11
8
12
9
13
10
14
11
15
13
16
14
18
15
19
16
20
17
21
18
22
19
23
20
24
21
25
22
26
23
27
24
28
26
29
27
31
28
32
29
33
30
34
31
35
32
36
33
37
34
38
35
39
36
40
37
41
38
42
39
43
40
44
41
45
42
46
43
47
44
47
45
48
46
49
46
50
47
51
48
C03027
Hide quick links:
Advertisement
Table of Contents
