14ACX - 1.5 to 5 Ton Air Conditioner / Page 4
COMPRESSOR
Scroll Compressor
Compressor features high
efficiency with uniform suction
flow, constant discharge flow, 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 the 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.
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 resilient rubber
mounts for vibration free operation.
Compressor Crankcase Heater (-041, -047, -048, -059
& -060 Models)
Protects against refrigerant migration that can occur
during low ambient operation.
Optional Accessories
Compressor Crankcase Heater (Optional for 018-
024-030-036-042)
Protects against refrigerant migration that can occur
during low ambient operation.
Compressor Sound Cover
A reinforced vinyl compressor cover containing a 1-1/2
inch thick batt of fiberglass insulation.
All open edges are sealed with a one-inch wide hook
and loop fastening tape.
D
CONTROLS
Optional Accessories
Compressor Hard Start Kit
Single-phase units are equipped with a PSC
compressor motor. This type of motor normally doesn’t
need a potential relay and start capacitor.
In conditions such as low voltage, this kit may be
required to increase the compressor starting torque.
Compressor Low Ambient Cut-Off Switch
Non-adjustable switch (low ambient cut-out) prevents
compressor operation when outdoor temperature is
below 35°F.
Compressor Time-Off Control
Kit prevents compressor short-cycling and allows time
for suction and discharge pressure to equalize.
Permits compressor start-up in an unloaded condition.
Automatic reset with 5 minute delay between
compressor shut-off and start-up.
Indoor Blower Off Delay Relay
Delays the indoor blower-off time during the cooling
cycle.
See AHRI System Matches for usage.
Low Ambient Kit
Air conditioners operate satisfactorily in the cooling
mode down to 45°F outdoor air temperature without any
additional controls.
Kit can be added in the field enabling unit to operate
properly down to 30°F in the cooling mode.
Crankcase heater and freezestat should be installed on
compressors equipped with a Low Ambient Kit.
A compressor lock-out thermostat should be added to
terminate compressor operation below recommended
operation conditions.
Thermostat
Thermostat not furnished with unit. See Thermostat
bulletins in Controls Section and Lennox Price Book.
FEATURES
