Compressor lockout switch, Maintenance lubrication, Cleaning coils – Carrier 38HDF018-036 User Manual
Page 14: Troubleshooting
14
Table 5 — Subcooling Charging Table
Compressor Lockout Switch —
The 38HDR units
are provided with a compressor lockout protective device. If
the compressor shuts down due to any safety device, a current
loop monitoring the compressor current senses no current flow.
The unit will lock out until the control power is interrupted to
reset the lockout. Determine the reason for the safety trip. To
restart, turn the thermostat to the OFF position and then set the
thermostat to an operating position.
MAINTENANCE
Lubrication
COMPRESSOR — Compressor contains factory oil charge;
replace oil when lost. Use Mobile 3MA-POE oil.
Cleaning Coils —
Coil should be washed out with water
or blown out with compressor air. Note that the blow-thru
design causes dirt and debris to build up on the inside of the
coils.
Clean coil annually or as required by location and outdoor
air conditions. Inspect coil monthly and clean as required. Fins
are not continuous through coil sections. Dirt and debris may
pass through first section, become trapped between the row of
fins and restrict condenser airflow. Use a flashlight to deter-
mine if dirt or debris has collected between coil sections. Clean
coil as follows:
1. Turn off unit power.
2. Using a garden hose or other suitable equipment, flush
coil from the outside to remove dirt. Be sure to flush all
dirt and debris from drain holes in base of unit. Fan
motors are waterproof.
TROUBLESHOOTING
See Fig. 9 for troubleshooting information.
LIQUID PRESSURE
AT SERVICE VALVE
(psig)
REQUIRED LIQUID LINE
TEMPERATURE (F)
Required Subcooling
Temperature (F)
8
10
12
14
16
18
189
58
56
54
52
50
48
195
60
58
56
54
52
50
202
62
60
58
56
54
52
208
64
62
60
58
56
54
215
66
64
62
60
58
56
222
68
66
64
62
60
58
229
70
68
66
64
62
60
236
72
70
68
66
64
62
243
74
72
70
68
66
64
251
76
74
72
70
68
66
259
78
76
74
72
70
68
266
80
78
76
74
72
70
274
82
80
78
76
74
72
283
84
82
80
78
76
74
291
86
84
82
80
78
76
299
88
86
84
82
80
78
308
90
88
86
84
82
80
317
92
90
88
86
84
82
326
94
92
90
88
86
84
335
96
94
92
90
88
86
345
98
96
94
92
90
88
354
100
98
96
94
92
90
364
102
100
98
96
94
92
374
104
102
100
98
96
94
384
106
104
102
100
98
96
395
108
106
104
102
100
98
406
110
108
106
104
102
100
416
112
110
108
106
104
102
427
114
112
110
108
106
104
439
116
114
112
110
108
106
450
118
116
114
112
110
108
462
120
118
116
114
112
110
474
122
120
118
116
114
112
486
124
122
120
118
116
114
499
126
124
122
120
118
116
511
128
126
124
122
120
118
Before performing recommended maintenance, be sure
unit main power switch is turned off. Failure to do so may
result in electric shock or injury from rotating fan blade.