Catalogue

WSHP-PRC020D-EN 57
Mechanical Specifications
General
Equipment is factory assembled, piped, internally wired, fully charged with R-410A refrigerant and
oil. Units are tested at the factory.
Products are certified in accordance with AHRIWater to Air and Brine to Air Heat Pump Certification
Program which is based ISO Standard 13256-1: 1998. All units have an ETL label that meets USA
(UL std) and Canadian (CSA std).
Casing
The cabinet assembly is constructed of heavy-gauge galvanized steel. It houses the blower, fan and
control hook-up to the unit thermostat or zone sensor. A basepan with condensate hose is included
with the cabinet design. Base rails allow ease of chassis installation/removal for service or
maintenance. One, two or three supply air openings shall are factory provided. Optional one or
three inch flanges are provided on all free discharge openings.
The chassis is constructed of heavy-gauge galvanized steel.The chassis houses the compressor,
reversing valve, water-to-refrigerant heat exchanger, air-to-refrigerant heat exchanger, thermal
expansion valve, corrosive resistant condensate pan, and water inlet/outlet connections.The
chassis is installed into the cabinet by sliding it in place on the locating rails within the cabinet
design.
The insulation contains a flame spread rating of less than 25 and smoke density rating of less than
50 (as tested in accordance with ASTM-85).The elastomer insulation has a UL 94-5V rating.
Sound Attenuation
Sound attenuation is applied as a standard feature in the product design.The enhanced reduction
package includes a heavy gage base plate, and gasket/insulation around the compressor
enclosure.
An optional deluxe sound reduction package is also available. It includes a heavy gage base plate,
gasket and insulation around the compressor enclosure, and vibration isolation between the
chassis and cabinet. An additional dampening treatment is applied around the compressor
enclosure to achieve greater acoustical reductions.
Filters
One inch, throwaway filters are standard and factory installed.The filters have an average
resistance of 76% and dust holding capacity of 26-grams per square foot.
Compressors
All units have direct-drive, hermetic, rotary (unit sizes 009-018) and scroll (unit sizes 024 and 036)
type compressors.The compressor contains rubber isolation to aid in noise reduction during
compressor start/stop.
Internal thermal overload protection and compressor anti-short cycle timers are also provided.
Protection against excessive discharge pressure is provided by means of a high pressure switch.
Loss of charge protection is provided by a low pressure switch.
Refrigerant Circuits
The refrigerant circuit contains a thermal expansion device, service pressure ports, and system
safety devices factory-installed as standard.
Air-to-Refrigerant Coil
Internally finned, 3/8” copper tubes mechanically bonded to a configured aluminum plate fin are
standard. Coils are leak tested at the factory to ensure the pressure integrity.The coil is leak tested
to 200 psig and pressure tested to 650 psig.