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Subject to change without notice. Printed in U.S.A.
Copyright
©
by Unitary Products Group 1999. All rights reserved.
Supersedes: 560.20-N1Y (1282)
560.20-N1Y (799)
YORK
5005 York
Norman
Unitary
Drive
OK
Product
North
73069
comes on. If unit has more than 1 stage of heat, con-
tinue raising thermostat until all heat in on.
ADJUSTING WATER REGULATING VALVE
(IF USED)
The water-regulating valve should be adjusted so that a 15°
to 20° water temperature range is held for maximum unit
capacity. To raise the temperature of the water off the con-
denser, increase tension on the power spring. To lower the
temperature of the water off the condenser, decrease tension
on the power spring.
FIGURE 17 : COOLING TOWER WATER PIPING
T O D R A I N
B L E E D V A L V E
S T R A I N E R
O V E R -
F L O W
C O O L I N G
T O W E R
M A K E U P
S U P P L Y
P U M P
B Y P A S S
T O A D D I T I O N A L U N I T S
FIGURE 18 : UNIT CONTROL ON WATER FLOW
R
Y
B
2 T B
2 4 V
T O W A T E R F L O W C O N T R O L *
T O A D D I T O N A L U N I T S *
* C o n t o r l i n c l u d e d c o o l i n g t o w e r p u m p / f a n ( 2 4 V c o i l ) o r o t h e r
f l o w c o n t o r l d e v i c e . 2 0 V A a v a i l a b l e p e r u n i t
FIGURE 19 : ALTERNATE UNIT CONTORL ON
WATER FLOW
R
Y
B
2 T B
2 4 V
T O A D D I T O N A L U N I T S *
* C o n t o r l i n c l u d e d c o o l i n g t o w e r p u m p / f a n ( 2 4 V c o i l ) o r o t h e r
f l o w c o n t o r l d e v i c e . 2 0 V A a v a i l a b l e p e r u n i t
A U X I L I A R Y C O N T R O L
( F I E L D S U P P L I E D )