26
Only use approved water pipe material. Do
not use galvanized material for water
lines/fittings.
Table 3 - Water Connections
Model (WHA-)
Return
Connection Size
006, 009, 012, 015, 018,
024
1/2”
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.
Before connection to the unit, the water
system must be flushed to remove foreign
material that could cause fouling. Install a
screen strainer with a minimum of 20 Mesh
ahead of the inlet to prevent fouling and
internal tube damage. Mineral content of the
water must be controlled. All make-up water
has minerals in it and as the water is
evaporated in the cooling tower, these
minerals remain. As the mineral content of
the water increases, the conductivity of the
water increases. A bleed-off (drain valve)
must be provided for the water loop.
PVC (Polyvinyl Chloride) and CPVC
(Chlorinated Polyvinyl Chloride) are
vulnerable to attack by certain
chemicals. Polyolester (POE) oils
used with R-
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 install
system components.
Improper fluid
flow due to valves, piping, or
improper pump operation may result
in unacceptable unit
void warranty.
WATER PIPING
Follow national and local codes when
installing water
vibration eliminators on connections
to the unit to reduce noise and
vibration and sh
facilitate servicing. Supply and return
water piping must be at least as large
as the unit connections and larger
depending on length of runs, rise and
bends.
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