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Connection method C:
NOTICE
This equipment uses B functionality. This terminal is energized for heating functionality.
Please ensure that thermostat configuration is set up for B functionality.
Non-communication scheme wiring reference
Note: These methods are for use with a Midea outdoor unit and a third party indoor unit
or Cased coil and gas furnace.
The following wiring diagram are suitable for the AHU and ODU with 24V thermostat.
• Wiring for 4H and 2C thermostat:
THERMOSTAT
S4-1 DIP switch off
Perform disconnection and short-circuit to
achieve partition, control or dehumidifi cation.
• Wiring for 3H and 1C thermostat:
W2
W1/E
O/B
Y
G
L
C
R
DH
THERMOSTAT
S4-1 DIP switch off
Perform disconnection and short-circuit to
achieve partition, control or dehumidifi cation.
• Wiring for 3H and 2C thermostat:
E
O/B
Y2
Y1
G
L
C
R
DH
THERMOSTAT
S4-1 DIP switch off
Perform disconnection and short-circuit to
achieve partition, control or dehumidifi cation.
Page 38
W2
W1/E
O/B
Y2
Y1
G
L
C
R
DH
R
C
L
G
DH
Y1
INDOOR UNIT
DH
R
C
L
G
Y1
INDOOR UNIT
DH
R
C
L
G
Y1
INDOOR UNIT
S4-1 DIP switch off
Perform disconnection and
B W
E
R
C
Y1 Y2
B W D
W1 W2
OUTDOOR UNIT
S4-2 DIP switch off
Disconnect and short-circuit
to realize heating segment.
B W
W1 W2
E
R
C
Y1 Y2
OUTDOOR UNIT
S4-2 DIP switch off
Disconnect and short-circuit
to realize heating segment.
R
C
Y1 Y2
B W
W1 W2
E
OUTDOOR UNIT
Emergency heating control two groups
of electric heating at the same time
L
B W D
L
B W D
L
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