Midea 18K - Page 38

 Page 38 
Wiring
• Wiring for 3H and 1C thermostat:
• Wiring for 3H and 2C thermostat:
Connection method C:
S4-1 DIP switch o
Perform disconnection and
Emergency heating control two groups
of electric heating at the same time
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
S4-1 DIP switch o
Perform disconnection and short-circuit to
achieve partition, control or dehumidi cation.
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:
NOTICE
This equipment uses B functionality. This terminal is energized for heating functionality.
Please ensure that thermostat configuration is set up for B functionality.
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
Y
G
L
C
R
W1/E
THERMOSTAT
S4-1 DIP switch o
Perform disconnection and short-circuit to
achieve partition, control or dehumidi cation.
S4-2 DIP switch o
Disconnect and short-circuit
to realize heating segment.
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
S4-1 DIP switch o
Perform disconnection and short-circuit to
achieve partition, control or dehumidi cation.
S4-2 DIP switch o
Disconnect and short-circuit
to realize heating segment.