Table of Contents
Advertisement
Fig. 10—Phase Monitor Control
phased for compressor operation. If the phasing is correct, circuit
R-Y energizes contactor, starting outdoor fan motor and compres-
sor circuit. R-G energizes indoor unit blower relay, starting indoor
blower motor on high speed.
NOTE: If the phasing is incorrect, the contactor will not be
energized. To correct the phasing, interchange any two of the three
power connections on the field side.
When thermostat is satisfied, its contacts open, de-energizing
contactor and blower relay. Compressor and motors stop.
If indoor unit is equipped with a time-delay relay circuit, the
indoor blower runs an additional 90 sec to increase system
efficiency.
TABLE 3—PHASE MONITOR LED INDICATORS
LED
OFF
No call for compressor operation
FLASHING
ON
XII. CHECK CHARGE
A. Unit Charge
Factory charge and charging method are shown on unit informa-
tion plate. Charge Puron® units using a commercial-type metering
device in manifold hose. Charge refrigerant into suction line.
NOTE: If superheat or subcooling charging conditions are not
favorable, charge must be weighed in accordance with unit rating
plate ± 0.6 oz/ft of 3/8-in. liquid line above or below 15 ft
respectively.
EXAMPLE:
25 ft - 15 ft = 10 ft X 0.6 oz/ft = 6 oz of additional charge
B. Cooling Only Procedure
Units With Cooling Mode Puron® TXV
Units installed with cooling mode TXV require charging by the
subcooling method.
1. Operate unit a minimum of 10 minutes before checking
charge.
2. Measure liquid service valve pressure by attaching an
accurate gage to service port.
3. Measure liquid line temperature by attaching an accurate
thermistor type or electronic thermometer to liquid near
outdoor coil.
4. Refer to unit rating plate for required subcooling tempera-
ture.
5. Refer to Table 4. Find the point where required subcooling
temperature intersects measured liquid service valve pres-
sure.
A00010
STATUS
Reversed phase
Normal
TABLE 4—REQUIRED LIQUID-LINE TEMPERATURE (°F)
LIQUID
PRESSURE AT
SERVICE VALVE
(PSIG)
189
195
202
208
215
222
229
236
243
251
259
266
274
283
291
299
308
317
326
335
345
354
364
374
384
395
406
416
427
439
450
462
474
486
499
511
6. To obtain required subcooling temperature at a specific
liquid line pressure, add refrigerant if liquid line tempera-
ture is higher than indicated or reclaim refrigerant if
temperature is lower. Allow a tolerance of ± 3°F.
Units With Indoor Pistons
Units installed with indoor pistons require charging by the super-
heat method.
The following procedure is valid when indoor airflow is within ±
21 percent of its rated CFM.
1. Operate unit a minimum of 10 minutes before checking
charge.
2. Measure suction pressure by attaching an accurate gage to
suction valve service port.
3. Measure suction temperature by attaching an accurate
thermistor type or electronic thermometer to suction line at
service valve.
4. Measure outdoor air dry-bulb temperature with thermom-
eter.
—7—
REQUIRED SUBCOOLING
TEMPERATURE
(°F)
8
10
12
14
16
58
56
54
52
50
60
58
56
54
52
62
60
58
56
54
64
62
60
58
56
66
64
62
60
58
68
66
64
62
60
70
68
66
64
62
72
70
68
66
64
74
72
70
68
66
76
74
72
70
68
78
76
74
72
70
80
78
76
74
72
82
80
78
76
74
84
82
80
78
76
86
84
82
80
78
88
86
84
82
80
90
88
86
84
82
92
90
88
86
84
94
92
90
88
86
96
94
92
90
88
98
96
94
92
90
100
98
96
94
92
102
100
98
96
94
104
102
100
98
96
106
104
102
100
98
108
106
104
102
100
110
108
106
104
102
112
110
108
106
104
114
112
110
108
106
116
114
112
110
108
118
116
114
112
110
120
118
116
114
112
122
120
118
116
114
124
122
120
118
116
126
124
122
120
118
128
126
124
122
120
18
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96
98
100
102
104
106
108
110
112
114
116
118
Advertisement
Table of Contents
