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Water-to-Water System Design Guide
Part IV: Controls / Wiring Diagrams
Drawing 4-8: 50PSW or GSW Unit - External
Pumps* / Cooling with Separate Water-to-Air Unit
Buffer Tank Aqua-Stat
Water-to-Water Unit
*Wiring assumes that both units will use the same
source pumps.
Water-to-Air Unit
Water-to-air unit wired to separate thermostat for space cooling.
66
R
Y
G
O
W
AL1
R
Y
G
O
W
AL1
14Sep07
Bryant: Whatever It Takes.
C
A
APSM
Source Pump
Slaving Module
APSM NOTES:
1) If source pumps are not sized so that
C
A
both w-w & w-a units can run at the
same time, a field installed relay must
be added to interrupt the w-a unit
compressor when the w-w unit is
operating. NOTE: An electrically
operated solenoid valve must be
installed at each unit to only allow
water flow through the unit that is
operating.
2) Load pump should be energized
when source pump is energized.
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