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Mechanical
Specifications
WSHP-PRC003-EN
185
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 facto-
ry 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 labels shall
also be placed on the unit in their
appropriate locations.
The 6 through 10-ton 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 labels 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
access 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 (13mm) 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 insula-
tion meets the erosion requirements of
UL 181. It has a flame spread of less
than 25 and a smoke developed classi-
fication of less than 50 per ASTM E-84
and UL 723.
Access for inspection and cleaning of
the unit drain pan, coils and fan section
shall be provided. The unit shall be
installed for proper access.
Filters
One inch or two inch, throwaway
filters shall be standard and factory
installed. 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 design.
The sound reduction package shall
include a compressor discharge muffler,
vibration isolation to the compressor
and water-to-refrigerant coil, unit base
stiffeners, insulated metal compressor
enclosure, and a second stage of vibra-
tion isolation to the compressor 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 compres-
sor. 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 provid-
ed 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 insulation
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 pres-
sure ports shall be factory supplied on
the high and low pressure sides for
easy refrigerant pressure or tempera-
ture testing.
Air-to-Refrigerant Coil
Internally finned, 3/8-inch copper tubes
mechanically bonded to a configured
aluminum plate fin shall be standard.
Coils shall be leak tested at the factory
to ensure the pressure integrity. The
coil shall be leak tested to 200 psig and
pressure tested to 450 psig.
The tubes are to be completely evacu-
ated of air and correctly charged with
proper volume of refrigerant prior to
shipment.The refrigerant coil distributor
assembly shall be of orifice style with
round copper distributor tubes. The
tubes shall be sized consistently with
the capacity of the coil. Suction header
shall be fabricated from rounded cop-
per pipe.
A thermostatic expansion valve shall be
factory selected and installed for a wide
range of control.
Drain Pan
The condensate pan shall be construct-
ed of corrosion resistant material and
insulated to prevent sweating. The bot-
tom of the drain pan shall be sloped on
two planes which pitches the conden-
sate to the drain connection. The drain
pan shall be flame rated per UL945V-B.