Lennox MCA Series Service Manual

8
4.3. Terminal Connections
208/230V Outdoor Unit
Terminal Block
From Power
Supply
Terminal Block
208/230V Indoor Unit
Outdoor Unit Indoor Unit
3
2
L1
L2
1
Y/G
1
3
Y/G
Y/G
115VAC Outdoor Unit
Terminal Block
From Power
Supply
Terminal Block
115VAC Indoor Unit
Outdoor Unit Indoor Unit
3
2
L
N
1
Y/G
1
3
Y/G
Y/G
*
*
18 and 24K
unit has
five terminal
sets.
Figure 6. Single Zone Wiring
5. Indoor Unit Diagrams
M
M
~
3
3
1
2
3
MAIN CONTROL BOARD
0
0
8
8
4
4
1
1
2
2
3
3
5
5
6
6
7
7
C
C
9
9
A
A
B
B
D
D
E
E
F
F
1
1
2
2
ON
ON
0
0
8
8
4
4
1
1
2
2
3
3
5
5
6
6
7
7
C
C
9
9
A
A
B
B
D
D
E
E
F
F
1
1
2
2
ON
ON
0
0
8
8
4
4
1
1
2
2
3
3
5
5
6
6
7
7
C
C
9
9
A
A
B
B
D
D
E
E
F
F
1
1
2
2
ON
ON
0
0
8
8
4
4
1
1
2
2
3
3
5
5
6
6
7
7
C
C
9
9
A
A
B
B
D
D
E
E
F
F
1
1
2
2
ON
ON
ENC2+S1
ENC2+S1
0~F
0~F
0~F
0~F
0~F
0~F
0~F
0~F
NETADDRESS
NETADDRESS
CODE
CODE
0~15
0~15
16~31
16~31
32~47
32~47
48~63
48~63
FOR SETTING NETADDRESS
FOR SETTING NETADDRESS
CN10A
DISP LA Y BOARD
8
Wired Controller
OPTIONAL
ADAPTER BOARD
CN 3 (C N3 01 )
CN 50 1
CN 40 3
X Y E
To LVM
Comm.Bus
YELLOW BROWN
RED
5
5
Programmable
Wired Controller
OPTIONAL
4
Note: The programmable wired
controller and LVM use the same
port CN403.
CN 2 (C N2 01 )
CN 40 2
NOTE: COMPONENT IN
DASH LINE IS OPTIONAL
OR FIELD WIRING
S5
FOR REMOTE ON/OF
FACTORY SETTING
MODE
REMOTE ON/OFF OFFREMOTE ON/OFF ON
(T1)
(T2)
Non-Programmble
Figure 7. 09K and 12K Indoor Unit Wiring Diagram (115 and 208/230VAC)

Lennox MCA Series Specifications

General

Brand	Lennox
Model	MCA Series
Category	Air Conditioner
Language	English