WSHP-PRC004-EN64
Reversing Valve
The reversing valve shall be a pilot
operating sliding piston type with
replaceable encapsulated magnetic coil.
This valve shall be energized in cooling.
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 [9.5 mm] thick wall
where ever air is introduced to the
assembly.
Refrigerant Metering
The equipment shall be provided with a
(TXV) thermal expansion valve to allow
operation of the unit with entering fluid
temperature from 25 F to 125 F [-3.9 C to
51.7 C].
Schrader Connections
The refrigerant access ports shall be
factory supplied on the high and low
pressure sides for easy refrigerant
pressure or temperature testing.
Air-to-Refrigerant Coil
The air-to-refrigerant coil shall contain
copper tubes mechanically expanded
into evenly spaced aluminum fins. All
coils are to be leak tested. The proof
must be performed at 450 psi operating
pressure and the leak test at 125 psi
operating pressure with helium. In
addition, the tubes are to be completely
evacuated of air 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 headers shall be
fabricated from rounded copper pipe.
A thermostatic expansion valve shall be
factory selected and installed for a wide
range of control.
Mechanical
Specifications
General
Equipment shall be completely
assembled, piped, internally wired and
test operated at the factory. It shall be
both ETL and ISO-ARI 13256-1 listed and
labeled prior to leaving the factory.
Service and caution area labels shall also
be placed on the unit in their appropriate
locations.
Cabinet
The cabinet shall be constructed of
galvanized steel, with exposed edges
rounded. The steel shall include
electrostatic powder paint in three
attractive colors for an appliance grade
finish. Service to the refrigerant and
controls shall be provided through a
single access panel at the front of the
unit chassis. Insulation for the internal
parts and surfaces exposed to the
conditioned air stream shall be made of
moisture resistant insulation.
The insulation shall be ½-inch [12.7 mm]
thick dual density bonded glass fiber.
The exposed side shall be a high density
erosion proof material suitable for use in
airstreams up to 4500 feet per minute
(FPM). Insulation shall meet the
Underwriters’ Laboratories Fire Hazard
Classification:
•
Flame spread = 20
•
Fuel Contributed = 15
•
Smoke developed = 0
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. Procedures for proper
access inspection and cleaning of the
unit shall be included in the maintenance
manual.
Sound Attenuation
Sound attenuation shall be applied as a
standard feature in the product design.
The sound reduction package shall
include a vibration isolation to the
compressor and water-to-refrigerant coil,
a second stage of vibration isolation to
the compressor base pan, heavy gauge
base assembly, insulated metal
compressor enclosure, and maximum
sized return-air opening and filter sizing .
The unit shall be tested and rated in
accordance with ARI 350.
Refrigeration System
Compressor
The unit shall include a general efficiency
rotary compressor. 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.
Thermal overload protection shall be
provided. Protection shall be provided
against excessive discharge pressure
operation by means of a high pressure
switch. Loss of charge protection shall
be provided by a low pressure switch.
Water-to-Refrigerant Heat Exchanger
The water-to-refrigerant heat exchanger
shall be of a high quality coaxial coil for
maximum heat transfer. The copper or
optional cupro-nickel coil shall be deeply
fluted to enhance heat transfer and
minimize fouling and scaling. The coil
shall have a working pressure of 450
psig on both the refrigerant and water
sides. The factory shall provide rubber
isolation to the heat exchanging device
to enhance sound attenuation.
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