Midea 18K Installation Manual page 28

20KW HEAT KIT
:thermal cut-out
:thermal link, self-resetting
Aux-Heat
control signal
BLUE
RED
BLACK
24V
NOTE1:
This symbol indicates the element is optional,
The wiring type of the actual unit shall prevail.
NOTE2:
Please attach the nameplate to the cover of the
electric control box. All the round holes located
on the plate represent numbers. Please refer to
the Installation Manual for details.
Round hole number Relay number
RELAY 1 RELAY 1
RELAY 2 RELAY 2
RELAY 3
RELAY 4
 Page 28 
0
RELAY4
8
RED 4
BLACK
0
8
RELAY3
4
RELAY1
RED BLACK BLACK
RELAY2
3
(green)
1(L1) 2(L2) 3(S)
Y/G
POWER A
Round hole number Circuit breaker number
CB1
CB2
HTR4
RED
BLACK
HTR3
RED
BLACK
2
BLACK
HTR1
RED
BLACK
HTR2
RED
BLACK
RED
RED BLACK
L1 L2
Y/G
POWER B
NOTE3: TO BE WIRED IN ACCORDANCE WITH NEC
AND LOCAL CODES.
NOTE4: POWER A,B,C,D ARE DIFFERENT POWERS.
The wiring mode of power supply A shall be
based on the type of original wiring terminal of
AHU; for type A, S position must be connected to
the ourdoor S; for type B, S position shall not be
connected.
1(L1) 2(L2) 3(S)
Y/G
TYPE A
BLACK
BLACK
RED
RED
L1 L2
Y/G
POWER C
Y/G
L1 L2
TYPE B