11
5 SERIES 506A11 OUTDOOR PACKAGED HEAT PUMP INSTALLATION MANUAL
Typical open loop piping is shown below. Always maintain
water pressure in the heat exchanger by placing water
control valves at the outlet of the unit to prevent mineral
precipitation. Use a closed, bladder-type expansion tank
to minimize mineral formation due to air exposure. Ensure
proper water flow through the unit by checking pressure
drop across the heat exchanger and comparing it to the
figures in pressure drop table in this manual. 1.5-2 gpm of
flow per ton of cooling capacity is recommended in open
loop applications.
Discharge water from the unit is not contaminated in any
manner and can be disposed of in various ways, depending
on local codes, i.e. recharge well, storm sewer, drain field,
adjacent stream or pond, etc. Most local codes forbid
the use of sanitary sewer for disposal. Consult your local
building and zoning departments to assure compliance in
your area.
Figure 7: Open Loop Solenoid Valve Connection Option
Typical slow operating external 24V water solenoid valve
(type V100FPT) wiring.
Water Out
Water In
Shut Off Valves
Boiler Drains
For HX Flushing
Rubber Bladder
Expansion Tank
Strainer
Flow Control
Valve
From Outdoor
Package Unit
To Outdoor
Package Unit
Figure 8: Open System - Groundwater Application
Open Loop Ground Water Systems
NOTE:
For open loop/groundwater systems or systems
that do not contain an antifreeze solution, set SW2-Switch
#1 to the “WELL” (30°F) position. (Refer to the DIP Switch
Settings table in the Aurora Control section.) Slow opening/
closing solenoid valves (type V100FPT) are recommended
to eliminate water hammer.
When equipment is ordered with factory installed ON/OFF
water valve the slow operating water valve will be wired
per Figure 7. DIP SW2-4 (ON) and SW2-5 (OFF) will be
configured so as to delay compressor and blower ON for
90 seconds to allow sufficient time for valve opening.
NOTE:
SW2-4 should be “ON” and SW2-5 should be “OFF”
when using a slow opening (V100FPT) water valve.
C
R
Acc Com
ACC NC
Acc NO
C
W/Y
V Valve
ABC Board
Orange(29)
Blue(30)
Black/
White(31)
