Catalogue

58 WSHP-PRC020D-EN
Mechanical Specifications
Drain Pan
The condensate pan is constructed of corrosive resistant material.The bottom of the drain pan is
sloped in two planes to pitch the condensate towards the drain connection. Condensate is piped
to a lower base pan through condensate hose for ease of chassis removal. A clear drain hose is
factory clamped onto the drain connection for field hook-up.
Water-to-Refrigerant Heat Exchanger
The water-to-refrigerant heat exchanger is of a high quality co-axial coil for maximum heat transfer.
The copper or optional cupro-nickel coil is deeply fluted to enhance heat transfer and minimize
fouling and scaling.The coil has a working pressure of 650 psig on the refrigerant side and 400 psig
on the water side.
Indoor Fan
The blower is a double width, double inlet (DWDI) forward curved wheel.The blower is a direct
drive PSC or optional ECM fractional horsepower motor.The blower/motor assembly is designed
for efficient and quiet operation.The PSC motor is multi-speed and is wired for a HIGH or LOW
setting.The ECM motor is programmed to provide four constant CFM profiles and is shipped on
Profile B – the rated CFM of the unit.The motor is also factory programmed to provide 50% airflow
in the fan only mode for additional energy savings. Service or maintenance to the blower/motor
is easily achieved by removal of a single bracket.
Risers
Factory provided supply and return risers are Type L copper.The drain riser isType M copper.
Swages from one diameter to another are performed as specified by the engineer in the field.
Diameters and length are specified by the equipment model number. Riser insulation (optional)
contains a flame rating per UL94-5V with flame spread rate of no more than 25.
Controls
The unit control box contains all necessary devices to allow heating and cooling operation to occur
from a unit mounted, plug-in thermostat or sensor.The devices are as follows:
• 24 VAC energy limiting class II 75 VA breaker type transformer.
• 24 VAC blower motor relay
• 24 VAC compressor contactor for compressor control
• Lockout relay which controls cycling of the compressor is provided to protect the compressor
during adverse operating conditions.The device may be reset by interrupting the 24 VAC
control circuit. Reset may be done either at the thermostat or by momentary main power
interruption.
• A high pressure switch protects the compressor against operation at refrigerant system
pressures exceeding 650 psig.
• A low pressure switch is provides that trips at 40 psig. A freezestat is provided - tripping at either
35° or 20°F.
• Factory installed wire harness is available for the Deluxe and ZN510 control packages.
• Power connections are made through a factory installed conduit located at the top of the unit’s
cabinet. An optional disconnect is provided.The conduit grants access directly to the control
box.
Nameplate information is given for the application of either time-delay fuses or HACR circuit
breakers for branch circuit protection from the primary source of power.
Single phase, single voltage rated equipment is designed to operate between plus or minus 10%
of nameplate utilization voltage.
Operation outside of this range may adversely effect the service life of the equipment.