Filter
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90 WSHP-PRC001-EN
General
Equipment shall be completely assem-
bled, piped, internally wired, fully
charged with HCFC-22 and test operat-
ed at the factory. Filters, thermostat
field interface terminal strip, and all
safety controls are furnished and fac-
tory installed.
The system water inlet and outlet con-
nections shall be female NPT com-
posed of either a copper or a bronze
option.
The 5-ton and below equipment shall
contain ETL, CETL and ISO-ARI
13256-1 listings and labels prior to
leaving the factory. Larger units shall
be rated in accordance with ISO-ARI
13256-1. Service and caution area la-
bels shall also be placed on the unit in
their appropriate locations.
Cabinet
Unit casing shall be constructed of zinc
coated, heavy gauge, galvanized steel.
Service to the refrigerant and controls
shall be provided through a single ac-
cess panel at the front of the equip-
ment. Access to the refrigerant and
controls for the larger units shall be
provided through the front and side
access panels.
All panels shall be insulated with
1/2-inch thick dual density bonded
glass fiber. The exposed side is a high
density erosion proof material suitable
for use in air streams up to 3600 feet
per minute (FPM). The insulation
meets the erosion requirements of UL
181. It has a flame spread of less than
25 and a smoke developed classifica-
tion of less than 50 per ASTM E-84 and
UL 723.
Access for inspection and cleaning of
the unit drain pan, coils and fan sec-
tion shall be provided. The unit shall
be installed for proper access.
Filters
One inch or two inch, throwaway
filters shall be standard and factory in-
stalled. The filters shall have an aver-
age resistance of 76-percent and dust
holding capacity of 26-grams per
square foot.
Sound Attenuation
Sound attenuation shall be applied as
a standard feature in the product de-
sign. The sound reduction package
shall include a compressor discharge
muffler, vibration isolation to the com-
pressor and water-to-refrigerant coil,
unit base stiffeners, insulated metal
compressor enclosure, and a second
stage of vibration isolation to the com-
pressor and water-to-refrigerant base
pan.
All units shall be tested and rated in
accordance with ARI 260.
Compressors
The unit shall contain a high efficiency
rotary, reciprocating, or scroll com-
pressor. External vibration isolation
shall be provided by rubber mounting
devices located underneath the
mounting base of the compressor. A
second isolation of the refrigeration
assembly shall be supported under
the compressor mounting base.
Internal thermal overload protection
shall be provided. Protection against
excessive discharge pressure shall be
provided by means of a high pressure
switch. A loss of charge shall be pro-
vided by a low pressure safety.
Refrigerant Tubing
The refrigerant tubing shall be of 99%
pure copper. This system shall be free
from contaminants and conditions
such as drilling fragments, dirt and oil.
All refrigerant and water lines shall be
insulated with an elastomeric insula-
tion that has a 3/8-inch thick wall in the
air-side section of the unit.
Refrigerant Circuits
The refrigerant circuit shall contained
a thermal expansion device. Service
pressure ports shall be factory sup-
plied on the high and low pressure
sides for easy refrigerant pressure or
temperature testing.
Air-to-Refrigerant Coil
Internally finned, 3/8-inch copper
tubes mechanically bonded to a con-
figured aluminum plate fin shall be
standard. Coils shall be leak tested at
the factory to ensure the pressure in-
tegrity. The coil shall be leak tested to
200 psig and pressure tested to 450
psig. The tubes are to be completely
evacuated of air and correctly charged
with proper volume of refrigerant pri-
or to shipment.
The refrigerant coil distributor assem-
bly shall be of orifice style with round
copper distributor tubes. The tubes
shall be sized consistently with the ca-
pacity of the coil. Suction header shall
be fabricated from rounded copper
pipe.
A thermostatic expansion valve shall
be factory selected and installed for a
wide range of control.
Drain Pan
The condensate pan shall be con-
structed of corrosion resistant materi-
al and insulated to prevent sweating.
The bottom of the drain pan shall be
sloped on two planes which pitches
the condensate to the drain connec-
tion. The drain pan shall be flame rat-
ed per UL945V-B. When the unit is
installed and trapped per the manufac-
turers installation manual, and local
city specifications, the drain pan shall
be designed to leave puddles no more
than 2-inch in diameter, no more than
1/8-inch deep, no longer than 3-min-
utes following the step 3 of the follow-
ing test.
1 Temporarily plug the drain pan.
2 Fill the drain pan with 1/2-inch of
water or the maximum allowed
by the drain pan depth, which-
ever is smaller.
3 Remove the temporary plug.
Mechanical
Specifications