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560.20-N1Y
035-16734-000
22
Unitary Products Group
When installing a cooling tower system:
1.
Avoid using long runs of pipe exposed to the sun.
2.
If freezing is a problem, provisions for draining the sys-
tem should be made. In addition, it may be desirable to
run as much of the piping indoors as possible.
FIGURE 15 : POWER SUPPLY FIELD WIRING DIAGRAM
1
1.
Three-phase units with electric heat require two power supplies. The electric heat power supply and ground wire should be con-
nected directly to the fuse block and ground lug in the electric heat control box. Use copper conductors only. Refer to Table 17 to
size the power wiring, disconnect switch, and fusing.
L 1
L 2
L 3
L I N E V O L T A G E P O W E R S U P P L Y *
T E R M I N A L B L O C K
1 T B O N C 2 E D U N I T
G R O U N D L U G
O N C 2 E D U N I T
W I R E I N A C C O R D A N C E W I T H
L O C A L A N D N A T I O N A L
E L E C T R I C A L C O D E S
* *
* P o w e r w i r i n g , d i s c o n n e c t s w i t c h a n d
f u s i n g b y f i e l d . U s e c o p p e r c o n d u c t o r s
o n l y .
* * O n l y t w o c o n d u c t o r s a r e r e q u i r e d o n
t h e s i n g l e p h a s e C 2 E D 0 6 0 A 6 0 .
FIGURE 16 : CONTROL (LOW VOLTAGE) FIELD WIRING DIAGRAM
C O O L I N G O N L Y U N I T S
R C
Y 1
Y 2
G
R
Y
0
G
*
2 4 - V O L T C O N T R O L W I R I N G
T E R M I N A L S O N
T - S T A T 2 T H 0 4 7 0 1 7 2 4
W I T H S U B - B A S E 2 T B 0 4 7 0 0 1 2 4
T E R M I N A L
B L O C K 2 T B
O N C 2 E D U N I T
* C 2 E D 0 6 0 u n i t s o n l y h a v e o n e
c o o l i n g s t a g e a n d c a n u s e t h e
f o l l o w i n g
T h e r m o s t a t
S u b - B a s e
2 T H 1 3 7 0 0 4 2 4
2 T B 0 8 7 0 0 1 2 4
U N I T S W I T H E L E C T R I C H E A T
W 2
Y 1
R
Y 2
W 1
G
R
Y
O
6 6
6 0
5 3
G
*
* *
T E R M I N A L S O N
T - S T A T 2 T H 0 4 7 0 1 5 2 4
W I T H S U B - B A S E 2 T B 0 4 7 0 0 3 2 4 * * *
T E R M I N A L
B L O W C K 4 T B
O N C 2 E D U N I T
J U M P E R
A n o u t d o o r j u m p e r c a n
b e w i r e d b e t w e e n
t e r m i n a l s 5 3 a n d 6 0 a n d
7 2 k W h e a t e r s .
* N o t r e q u i r e d o n C 2 E D 0 6 0 u n i t s
( o n l y o n e - s t a g e c o o l i n g ) .
* * N o t r e q u i r e d o n 1 0 k W h e a t e r s
( o n l y o n e - s t a g e h e a t i n g ) .
* * * T h i s t - s t a t a n d s u b - b a s e w i l l
c y c l e t h e s u p p l y a i r b l o w e r
m o t o r o n e i t h e r a c o o l i n g o r
h e a t i n g d e m a n d .
U N I T S W I T H S T E A M O R H O T W A T E R H E A T
2 4 - V O L T C O N T R O L W I R I N G
W 1
G
Y 2
Y 1
W 2
R
R
Y
O
G
B
2 4 - V O L T C O N T R O L W I R I N G
T O H O T W A T E R O R
S T E A M C O N T R O L
C I R C U I T
T E R M I N A L S O N T - S T A T
2 T H 0 4 7 0 1 5 2 4 W I T H S U B -
B A S E 2 T G 0 4 7 0 0 3 2 4 * *
T E R M I N A L
B L O C K 2 T B
O N C 2 E D U N I T
*
* C 2 E D 0 6 0 u n i t s o n l y h a v e o n e c o o l i n g
s t a g e a n d c a n u s e t h e f o l l o w i n g
* * T h i s t - s t a t a n d s u b - b a s e w i l l c y c l e t h e
s u p p l y a i r b l o w e r m o t o r o n e i t h e r
c o o l i n g o r h e a t i n g d e m a n d s .
T h e r m o s t a t
S u b - B a s e
2 T H 1 3 7 0 0 4 2 4
2 T B 1 7 7 0 0 3 2 4