035-13329-001-B-0504
Unitary Products Group
11
CONTROL WIRING
CAUTION:
Label all wires prior to disconnection when servicing con-
trols. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
FIGURE 6 - TYPICAL FIELD WIRING
4
R V
Y C
GF
R
Y 1
B
Y 2
THERMOSTAT
1
TERMINALS
UNIT TERMINAL
STRIP TB1
24 VOLT
TRANSFORMER
COOLING ONLY (24 VOLT THERMOSTAT)
1
24 VOLT THERMOSTAT 2TH07701024 IF THE UNIT HAS AN ECONOMIZER,
REMOVE JUMPER J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD
TO PREVENT SIMULTANEOUS OPERATION OF THE COMPRESSOR AND
THE ECONOMIZER. IF YOU WANT TO CONTROL THE ECONOMIZER ON A
SECOND STAGE OF COOLING, USE THE THERMOSTAT 2TH04701224.
R C
Y
R
Y 1
Y 2
W
1
W
W
2
G
B
G
R H
T H E R M O S T A T
1
T E R M I N A L S
U N I T T E R M I N A L
S T R I P T B 1
2 4 V O L T
T R A N S F O R M E R
C O O L I N G / H E A T I N G ( 2 4 V O L T T H E R M O S T A T )
1
2 4 V O L T T H E R M O S T A T 2 T H 0 7 7 0 1 0 2 4 . I F T H E U N I T H A S A N E C O N O M I Z E R ,
R E M O V E J U M P E R J 1 F R O M T E R M I N A L S 8 A N D 1 0 O N T H E R E L A Y B O A R D
T O P R E V E N T S I M U L T A N E O U S O P E R A T I O N O F T H E C O M P R E S S O R A N D
T H E E C O N O M I Z E R . I F Y O U W
A N T T O C O N T R O L T H E R E C O N O M I Z E R O N A
S E C O N D S T A G E O F C O O L I N G O R H A V E A N D E L E C T R I C H E A T A C C E S S O R Y
W
I T H T W
O S T A G E S O F H E A T , U S E T H E R M O S T A T 2 T H 0 4 7 1 0 2 4
A D D
J U M P E R
R
C
R
H
Y 1
Y 2
W
1
W
2
G
L E D
1
L E D
2
C
O
M
A 1
A 2
T
T
B
R
Y 1
Y 2
G
B
X
N
W
2
W
1
T H
E R
M
O
S T A T
1
T E R
M
I N
A L S
U
N
I T T E R
M
I N
A L
S T R
I P T B 1
2 4 V O
L T
T R
A N
S F O
R
M
E R
T O
R
E M
O
T E S E N
S O
R
2 T H
0 4 0 7 0 2 2 2 4 I F U
S E D
N
O
T
U
S E D
A D
D
J U
M
P E R
A D
D
J U
M
P E R
4
4
3
2
1
E L E C
T R
O
N
I C
P R
O
G
R
A M
M
A B L E T H
E R
M
O
S T A T 2 E T 0 4 7 0 0 2 2 4 ( I N
C
L U
D
E S S U
B B A S E )
2
S E C
O
N
D
S T A G
E C
O
O
L I N
G
I S N
O
T R
E Q
U
I R
E D
O
N
U
N
I T S L E S S E C
O
N
O
M
I Z E R
.
3
S E C
O
N
D
S T A G
E H
E A T I N
G
I S O
N
L Y R
E Q
U
I R
E D
O
N
U
N
I T S W
I T H
A T W
O
S T A G
E
E L E C
T R
I C
H
E A T E R
.
4
R
E M
O
V E J U
M
B E R
J 2 F R
O
M
T E R
M
I N
A L S 4 A N
D
9 O
N
J U
M
P E R
P L U
G
C
O
N
N
E C
T O
R
P 6 O
N
U
N
I T S W
I T H
E C
O
N
M
I Z E R
. T E R
M
I N
A L S A 1 A N
D
A 2 P R
O
V I D
E A R
E L A Y
O
U
T - P U
T T O
C
L O
S E T H
E O
U
T D
O
O
R
E C
O
N
O
M
I Z E R
D
A M
P E R
S W
H
E N
T H
E
T H
E R
M
O
S T A T S W
I T C
H
E S T O
T H
E S E T - B A C
K P O
S I T I O
N
.
R H
R C
Y
W
G
R
Y 1
W 1
B
G
A D D
J U M P E R
T H E R M O S T A T
1
T E R M I N A L S
U N I T T E R M I N A L
S T R I P T B 1
2 4 V O L T
T R A N S F O R M E R
1
E L E C T R O N I C P R O G R A M M A B L E T H E R M O S T A T 2 E T 0 7 7 0 1 0 2 4 ( I N C L U D E S S U B B A S E ) .
I F T H I S U N I T H A S A N D E C O N O M I Z E R , R E M O V E J U M P E R J 1 F R O M T E R M I N A L S 8 A N D
1 0 O N T H E R E L A Y B O A R D T O P R E V E N T S I M U L T A N E O U S O P E R A T I O N O F T H E
C O M P R E S S O R A N D T H E E C O N O M I Z E R . I F Y O U W A N T T O C O N T R O L T H E
E C O N O M I Z E R O N A S E C O N D S T A G E O F C O O L I N G , U S E T H E R M O S T A T 2 E T 0 4 7 0 0 2 2 4 .
C O O L I N G / H E A T I N G ( E L E C T R O N I C T H E R M O S T A T )
S I N G L E S T A G E
