Internal
solenoid
Slider
Ring
Fixed scroll
Internal solenoid
Slider Ring
SPB − 3 to 5 Ton R−410A Heat Pump
Outdoor Units
FEATURES
REFRIGERATION SYSTEM (CONTINUED)
Expansion Valve − Outdoor Unit
Designed and sized specifically for use in heat pump
system.
Sensing bulb is located on the line between reversing valve
and the coil thus sensing suction temperature in any cycle.
Factory installed and piped.
Discharge Temperature Switch
Shuts off unit if operating conditions cause the
compressor discharge line temperature to rise above
setpoint.
Protects compressor from excessive pressure /
temperature.
Automatic reset when temperature drops below setpoint.
High Pressure Switch
Shuts off unit if abnormal operating conditions cause the
discharge pressure to rise above setting.
Protects compressor from excessive condensing
pressure.
Automatic reset.
Low Pressure Switch
Shuts off unit if suction pressure falls below setting.
Provides loss of charge and freeze-up protection.
Automatic reset.
Hi-Capacity Liquid Line Drier
Factory installed in the liquid line, the drier traps moisture
or dirt that could contaminate the refrigerant system.
100% molecular−sieve bead type drier.
Reversing Valve
4-way interchange reversing valve effects a rapid change
in direction of refrigerant flow resulting in quick
changeover from cooling to heating and vice versa.
Valve operates on pressure differential between outdoor
unit and indoor unit of the system. Factory installed.
OPTIONS
Expansion Valve Kits
Must be ordered extra and field installed on certain indoor
units. See ARI Ratings tables.
Chatleff style fitting.
Freezestat
Installs on or near the discharge line of the evaporator or
on the suction line.
Senses suction line temperature and cycles the
compressor off when suction line temperature falls below
it’s setpoint.
Opens at 29°F and closes at 58°F.
Refrigerant Line Sets
Refrigerant lines (suction & liquid) are shipped
refrigeration clean. Lines are cleaned, dried, pressurized,
and sealed at factory.
Suction line fully insulated.
L15 lines are stubbed at both ends.
See Specifications table for selection.
Not available for −060 model and must be field fabricated.
COMPRESSOR
Copeland Scroll Ultra Tech
t
Two−Stage Compressor
Compressor features high
efficiency with uniform
suction flow, constant
discharge flow and high
volumetric efficiency and
quiet operation.
Compressor consists of
two involute spiral scrolls
matched together to
generate a series of
crescent shaped gas
pockets between them.
During compression, one
scroll remains stationary
while the other scroll orbits
around it.
Gas is drawn into the outer
pocket, the pocket is sealed as the scroll rotates.
As the spiral movement continues, gas pockets are
pushed to the center of the scrolls. Volume between the
pockets is simultaneously reduced.
When pocket reaches the center, gas is now at high
pressure and is forced out of a port located in the center
of the fixed scrolls. During
compression, several
pockets are compressed
simultaneously resulting in
a smooth continuous
compression cycle.
Continuous flank contact,
maintained by centrifugal
force, minimizes gas
leakage and maximizes
efficiency.
Scroll compressor is tolerant to the effects of slugging
and contaminants. If this occurs, scrolls separate,
allowing liquid or contaminants to to be worked toward
the center and discharged.
On the fixed scroll there are two bypass ports in the first
suction pocket. On the outside of the fixed scroll there is a
slider ring" that is controlled by an internal solenoid that
will rotate and cover the bypass ports. When the
thermostat calls for first−stage cooling, the bypass ports
are open and the compressor operates at 67% capacity,
creating more cost−effective and efficient compressor
operation. The bypassed refrigerant is returned to the
compressor housing through the bypass ports. When
the thermostat calls for second−stage cooling, the
internal solenoid is energized, the slider ring rotates and
covers the bypass ports, and the compressor operates
at full capacity.
Low gas pulses during compression reduces
operational sound levels.
Compressor motor is internally protected from
excessive current and temperature.
Compressor is installed in the unit on specially
formulated, resilient rubber mounts for better sound
dampening and vibration free operation.
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