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INSTALLATION INSTRUCTIONS
Figure 16
Subcooling Temperature (°F)
Measured Liquid
5
Pressure (psig)
134
71
141
74
148
77
156
80
163
83
171
86
179
89
187
92
196
95
205
98
214
101
223
104
SEQUENCE OF OPERATION
A. COOLING MODE
On a call for cooling, the thermostat makes circuits R-O,
R-Y , and R-G. Circuit R-O energizes reversing valve,
switching it to cooling position. Circuit R-Y energizes
contactor, starting outdoor fan motor and compressor.
Circuit R-G energizes indoor unit blower relay, starting
indoor blower motor.
When thermostat is satisfied, its contacts open,
de-energizing contactor and blower relay. Compressor
and motors stop.
NOTE: If indoor unit is equipped with a time-delay relay
circuit, the blower runs an additional length of time to
increase system efficiency. (Applies to both cooling and
heating modes.)
NOTE: Low ambient cooling feature allows unit to
operate safely in cooling mode down to 0° F outdoor
ambient.
506 01 5001 00
Temperature (°F) - Cooling Mode
Rating Plate (required)
10
15
20
66
61
56
69
64
59
72
67
62
75
70
65
78
73
68
81
76
71
84
79
74
87
82
77
90
85
80
93
88
83
96
91
86
99
94
89
3-phase R-22 Split System Heat Pump
R-22 Required Liquid Line
Measured Liquid
Pressure (psig)
233
243
253
264
274
285
297
309
321
331
346
359
B. HEATING MODE
On a call for heating, the thermostat makes circuits R-Y
and R-G (circuit R-O is NOT made, and the reversing
valve stays in the de-energized, heating position). Circuit
R-Y energizes contactor, starting outdoor fan motor and
compressor. Circuit R-G energizes indoor blower relay,
starting blower motor. If the room temperature continues
to fall, circuit R-W2 is made through the second-stage
room thermostat bulb. Circuit R-W2 energizes a
sequencer, bringing on the first bank supplemental
electric heat and providing electrical potential to the
second
heater
sequencer
temperature falls below the setting of the outdoor
thermostat (field-installed option), contacts close to
complete the circuit and bring on the second bank of
supplemental electric heat.
When the thermostat is satisfied, its contacts open,
de-energizing contactor, blower relay, and sequencer.
Compressor, motors, and heaters stop.
Rating Plate (required)
Subcooling Temperature (°F)
5
10
15
107
102
97
110
105
100
113
108
103
116
111
106
119
114
109
122
117
112
125
120
115
128
123
118
131
126
121
134
129
124
137
132
127
140
135
130
(if
used).
If
20
92
95
98
101
104
107
110
113
116
119
122
125
outdoor
13
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