22
Water loop piping runs through unheated
areas or outside the building must be
insulated.
Never operate the unit in heat pump mode
with a saturated suction temperature below
35°F for pure water systems or below the
freezing point +3°F of the aqueous solution
of water and glycol.
Water Piping
Only use approved water pipe material. Do
not use galvanized material for water
lines/fittings.
Table 3 - Water Connections
Horizontal WSHP
Supply and
Return
Connection Size
(in. FPT)
006, 009, 012, 015, 018
1/2”
024, 030, 036, 042
3/4”
048, 060
1”
Water pump must be field sized and installed
between the cooling tower or geothermal
wellfield and self-contained unit. System
must be sized in accordance with the
ASHRAE Handbook. Use engineering
guidelines to maintain equal distances for
supply and return piping and limit bend radii
to maintain balance in the system. Balancing
valves, permanent thermometers and gauges
may be required.
WATER PRESSURE
Prior to connection of the water
supply, verify water pressure is less
than maximum pressure shown on
unit nameplate. To prevent injury or
death due to instantaneous release of
high pressure water, drain valves
must be field supplied on water piping.
Supply water connection may require
a backflow preventer to prevent
supply makeup water from backing up
into the public water system.
PVC (Polyvinyl Chloride) and CPVC
(Chlorinated Polyvinyl Chloride) are
vulnerable to attack by certain
chemicals. Polyolester (POE) oils
used with R-410A and other
refrigerants, even in trace amounts, in
a PVC or CPVC piping system will
result in stress cracking of the piping
and fittings and complete piping
system failure.
Installing contractor is responsible for
properly sizing and installing water
system components. Improper fluid
flow due to valves, piping, or improper
pump operation may result in
unacceptable unit operation and void
warranty.
WARNING
CAUTION
CAUTION