Classic HVPA & HVPSA M&S 8.09-1
15700 - 10
HVAC Equipment
Drains
Regularly check the primary and secondary condensate drains. The secondary drain
has a stand pipe. An obstruction will force water to dump into the middle of the
unit and drain out the sides of the Classic™ Heat Pump, causing discoloration of the
side panels. If discoloration is noted, service the drains.
If a commercial drain solvent is used, flush out the drain pan and system with plenty
of fresh water to prevent corrosion.
Lubrication
Oiling of the condenser fan motor or the evaporator blower motor is not
recommended.
5.1 FUNCTION AND DESCRIPTION OF PRIMARY COMPONENTS
A.
Compressor.
All Classic units use a fully hermetic scroll compressor to minimize
sound levels and maximize efficiency. Scroll compressors, like several other types
of compressors, will only compress in one rotational direction. The direction of
rotation is not an issue with single-phase compressors since they will always start
and run in the proper direction. However, three phase compressors will rotate in
either direction depending upon phasing of power. Since there is a 50-50 chance
of connecting power in such a way as to cause rotation in the reverse direction, it
is imperative to confirm that the compressor is rotating in the proper direction at
the initial field start-up of the system. Verification of proper rotation is made by
observing that the suction pressure drops and the discharge pressure rises when
the compressor is energized. An alternate method of verification for self contained
system with small critical refrigerant charges, where the installation of gauges may
be objectionable, can be made by monitoring the temperature of the refrigerant
lines at the compressor. The temperature should rise on the discharge line while the
suction line temperature decreases. Reverse rotation also results in a substantially
reduced current draw when compared to tabulated values.
There is no negative impact on durability caused by operating three phase
compressors in the reversed direction for a short duration of time, usually defined
as less than one hour. However, after several minutes of operation the compressor's
internal protector will trip. The compressor will then cycle on the protector until
the phasing is corrected. Reverse operation for longer than one hour may have a
negative impact on the bearings.
B.
Indoor Blower and Motor.
The indoor blower assembly is an electronically
commutated blower motor and dual blowers.
C.
Outdoor Air Mover.
The outdoor air mover is an axial fan with an asynchronous
external rotor motor.
D.
Indoor/Outdoor Coils.
The coils are constructed of lanced, aluminum fins
mechanically bonded to rifled, seamless copper tubes.
E.
Filter Drier
- The filter drier performs two functions in the refrigerant circuit. First,
