Carrier 38AC - Manual (Page 4)

Heating Cycle
38AC016 WITH 40RT016
Cooling Cycle
9 Hot gas from compressor flows thru muffler to reversing
valve
o Hot gas is directed to header on indoor coils. In these coils
hot gas is condensed to a liquid This liquid flows out thru
feeder tubes to the distributors where it passes thru the side
outlet TXV B and B-| are closed because of high equalizing
pressure
o Liquid flows thru check valve C proceeding to outdoor unit.
O Liquid flows thru filter-drier, TXV (A), distributor, and
feeder tubes into outdoor coil where it is evaporated into a
vapor (Entire outdoor coil is an evaporative surface during
this cycle )
0
Cool vapor from outdoor coil subcooler is pulled thru check
valve A and meets with gas flowing from remainder of
outdoor coil (check valve B closed).
0 Cool vapor flows thru reversing valve where it is directed to
accumulator and into compressor suction valve to repeat
cycle.
38AC PIPING LEGEND
HEATING CYCLE 0----------
COOLING CYCLE @ ~i
COMPRESSOR
SOLENOID OPERATED
REVERSING VALVE
(SOLENOID ENERGIZED ON HEATING
DE-ENERGIZED ON COOLING)
JA;! Hot gas from compressor flows thru muffler to reversing
valve
i®) Hot gas is directed to header on outdoor coil (check valve A
closed)
Header directs hot gas to individual coil circuits where it is
condensed to liquid.
Liquid out of outdoor coil makes 180 degree turn in
distributor and flows thru tubes to and thru subcooler. TXV
(A) is closed because of high equalizing pressure.
Subcooled liquid flows thru check valve B and toward indoor
unit
i":'i Liquid continues thru filter-drier, expansion valve B and
B-) into distributors and into indoor coils Check valve C is
closed.
Cool vapor flows out of indoor coil back to reversing valve
where it is directed to accumulator and then to compressor
suction valve to repeat cycle.
38AC012 WITH 40RT012
These combinations follow the same basic diagram with two
exceptions
There is only one coil on the indoor unit and therefore only
one expansion valve. Also the 40RT012 is provided with a
subcooling coil which performs two functions
On heating cycle it is full of liquid which tends to balance the
refrigerant charge while providing subcooling.
On cooling cycle a check valve prevents liquid refrigerant
from entering the subcooler coil; this portion has vapor only.
MOISTURE INDICATOR
SIGHT GLASS
Fig. 2 — Heat Pump Cycle (Heating and Cooling)