Installation Manual

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