Lennox TPA036H4, User Manual

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TP − 3 to 5 Ton High−Efficiency, R−410A Heat Pump / Page 3
FEATURES
REFRIGERATION SYSTEM (CONTINUED)
Copper Tube/Enhanced Fin Coil
Lennox designed and fabricated coil.
Ripple-edged aluminum fins.
Copper tube construction.
Lanced fins provide maximum exposure of fin surface to
air stream resulting in excellent heat transfer.
Fin collars grip tubing for maximum contact area.
Flared shoulder tubing connections/silver soldering
construction.
Coil is factory tested under high pressure to ensure
leakproof construction.
Entire coil is accessible for cleaning.
PVC coated steel wire coil guard furnished as standard.
Expansion Valve − Outdoor Unit
Designed and sized specifically for use in heat pump
system.
Sensing bulb is located on the suction line between the
reversing valve and the compressor to sense evaporator
suction temperature in any cycle.
Factory installed and piped.
High 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 bi−flow 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.
High Pressure Switch Kit
Protects the system from high pressure conditions that
can be a result of fan failure or a blocked/dirty coil.
Automatic reset.
OPTIONS
Refrigerant Line Kits
Refrigerant lines (suction & liquid) are shipped refrigeration
clean. Lines are cleaned, dried, pressurized and sealed at
factory.
Suction line fully insulated.
Lines are stubbed at both ends.
Not available for −060 models and must be field fabricated.
Loss of Charge Kit
Helps protect the compressor from damage due low
refrigerant charge conditions.
SPST, normally−closed switch, automatic reset switch
mounted on suction line.
Compressor
Scroll 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.
Low gas pulses during compression reduces operational
sound levels.
Compressor motor is internally protected from excessive
current and temperature.
Muffler in discharge line reduces operating sound levels.
Compressor is installed in the unit on resilient rubber
mounts for vibration free operation.
Compressor Crankcase Heater
Protects against refrigerant migration that can occur
during low ambient operation.
OPTIONS
Compressor Low Ambient Cut−Off
Non-adjustable switch (low ambient cut-out) prevents
compressor operation when outdoor temperature is
below 35°F.
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.
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