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INSTALLATION INSTRUCTIONS
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.)
Table 3 - Rating Plate (required) Subcooling Temperature ° F (° C)
Measured Liquid
Pressure (psig)
251
259
266
274
283
291
299
308
317
326
335
345
100
364
104
374
106
384
108
395
110
406
112
416
114
427
116
439
118
450
120
462
122
474
124
10
° F
° F
(° C)
(° C)
6
3
8
4
R- 410A Required Liquid Line Temperature ° F (° C)
78
26
76
24
80
27
78
26
82
28
80
27
84
29
82
28
86
30
84
29
88
31
86
30
90
32
88
31
92
33
90
32
94
34
92
33
96
36
94
34
98
37
96
36
38
98
37
40
102
39
41
104
40
42
106
41
43
108
42
44
110
43
46
112
44
47
114
46
48
116
47
49
118
48
50
120
49
51
122
50
Specifications subject to change without notice.
R- 410A Split System Heat Pumps
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 (if used). If
outdoor 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.
° F
° F
(° C)
(° C)
10
6
12
7
74
23
72
22
76
24
74
23
78
26
76
24
80
27
78
26
82
28
80
27
84
29
82
28
86
30
84
29
88
31
86
30
90
32
88
31
92
33
90
32
94
34
92
33
96
36
94
34
100
38
98
37
102
39
100
38
104
40
102
39
106
41
104
40
108
42
106
41
110
43
108
42
112
44
110
43
114
46
112
44
116
47
114
46
118
48
116
47
120
49
118
48
F
(° C)
F
(° C)
14
8
16
9
70
21
68
20
72
22
70
21
74
23
72
22
76
24
74
23
78
26
76
24
80
27
78
26
82
28
80
27
84
29
82
28
86
30
84
29
88
31
86
30
90
32
88
31
92
33
90
32
96
36
94
34
98
37
96
36
100
38
98
37
102
39
100
38
104
40
102
39
106
41
104
40
108
42
106
41
110
43
108
42
112
44
110
43
114
46
112
44
116
47
114
46
428 01 5110 00
- Quick Links:
- General Sequence of Operation
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