40MUAA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
31
24V CONNECTION DIAGRAMS
Table 19 — Terminal Function
NOTE: Terminal D will be energized when the outdoor unit
goes into defrost mode and can be used to enable
electric heat. This feature is not available when the
outdoor unit communicates with the indoor unit via
non-polarity RS485 Communication S1-S2.
Fig. 63 —Wiring for 4H and 2C Thermostat
Fig. 64 —Wiring for 3H and 1C Thermostat
Fig. 65 —Wiring for 3H and 2C Thermostat
Fig. 66 —Wiring for 3H and 2C Thermostat
Fig. 67 —Wiring for 2H and 2C Thermostat
Fig. 68 —Wiring for 2H and 1C Thermostat
Fig. 69 —Wiring for 1H and 1C Thermostat
R 24V Power Connection
C Common
Y1 Low Demand
Y2 High Demand
B Heating Reversing Valve
W Heating Control
D Defrost - (24V output signal)
L System Fault - (24V output signal)
R L G B W E
C
Y1
DH
W1 W2
R B W D L
C
Y1
Y2
INDOOR UNIT
OUTDOOR UNIT
DH
O/B
W2
Y2
Y1
G
L
C
R
W1/E
THERMOSTAT
Y
/
Y2
R L G B W E
C
Y1
DH W1 W2
R B W D L
C
Y1
Y2
INDOOR UNIT
DH
OUTDOOR UNIT
O/B
W2
Y
G
L
C
R
W1/E
THERMOSTAT
Y
/
Y2
R L G B W E
C
Y1
DH
W1 W2
R B W D L
C
Y1
Y2
INDOOR UNIT
DH
O/B
Y2
Y1
G
L
C
R
E
THERMOSTAT
OUTDOOR UNIT
Y
/
Y2
S4-1:
Default ON: For single stage
supplemental heat, W1 and W2 are
connected.
OFF: For dual stage supplemental heat,
W1 and W2 are controlled
independently. feature is enabled
through thermostat.
S4-2:
Default ON: Dehumidification control not
available.
OFF: Dehumidification feature is enabled
through thermostat.
Note: Dip switches are located on compatible indoor unit.
Refer to the indoor unit installation manual for
additional information.
R L G B W E
C
Y1
DH
W1 W2
R B W D L
C
Y1
Y2
INDOOR UNIT
DH
O/B
Y2
Y1
G
L
C
R
W1/E
THERMOSTAT
OUTDOOR UNIT
Y
/
Y2
R L G B W E
C
Y1
DH
W1 W2
R B W D L
C
Y1
Y2
INDOOR UNIT
OUTDOOR UNIT
O/B
Y2
Y1
G
C
R
THERMOSTAT
Y
/
Y2
R L G B W E
C
Y1
DH
W1 W2
R B W D L
C
Y1
Y2
INDOOR UNIT
OUTDOOR UNIT
O/B
Y
G
C
R
W/E
THERMOSTAT
Y
/
Y2
R L G B W E
C
Y1
DH W1 W2
R B W D L
C
Y1
Y2
INDOOR UNIT
Y2
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