Carrier 38AQ Specifications download pdf (Page 24)

COMPRESSOR _ REVERSING VALVE

?M ULAT_'_O R _ VAPOR-_LINE

CK VALVE B

CK VALVE A

CK VALVE C

FILTER

DRIER

FIXED ORIFICE

METERING DEVICE

LIQUID LINE

Fig. 21 -- 38ARQ008, 012 Heating Mode (Size 008 Shown)

INDOOR

UNIT

BALL

VALVE

FROM

[_ INDOOR

BALL UNIT

VALVE

38AQS016 Cooling Mode Operation

(See Fig. 22)

I. High pressure, high temperature lefrigemnt vapor froln

the compressor flows through the reversing valve and is

directed to the outdoor coil vapor headel:

2. At the outdoor coil vapor headel: the high pressure, high

temperature refrigerant vapor flows up to check valve

"A" that blocks the flow. All the refrigerant is then

directed to flow into the coil circuits.

Subcooled refrigerant liquid leaves the coil circuits

entering the portion of the vapor header which is above

check valve "A". Check valve "C" is closed, therefore,

the liquid refrigerant passes through check valve "B,"

which is open, and enters the liquid line and goes to the

indoor coil.

4. The liquid refrigerant is expanded and evaporated in the

indoor coil resulting in low pressure vapor This low

plessure vapor returns to the outdoor unit through the

system vapor line, reversing valve, and accumulator.

reentering the compressor at the suction connection.

38AQ8016 Heating Mode Operation

(See Fig. 23)

I. High pressure, high temperature lefrigemnt vapor froln

the compressor flows through the reversing valve and

is directed through the system vapor line to the indoor

coil. Refrigerant is condensed and subcooled in the

indoor coil and returns to the outdoor unit through the

system liquid line.

2. Check valve "B" blocks the flow of liquid and the refiig-

erant is then directed to flow through check wtlve "C"

(which is open), through the filter drier, and into the

liquid header assembly.

3. The liquid refrigerant is expanded as it passes through the

capillary tubes into outdoor coil circuits. The refrigerant

evaporates as it passes through the coil circuits resulting

in low plessure vapol:

4. The low pressme vapor leaves the coil circuits and enters

the vapor headek check valve "A" is open, and returns to

the compressor through the vapor line, leversing v;dve,

and accumulator. _eentering the compressor at the suction

connection.

Crankcase Heater--The crankcase heater prevents

refrigerant migration and compressor oil dilution during

shutdown when compressor is not operating.

Close both compressor service valves when crankcase

heater is deenergized for more than 6 houL's.

Outdoor Unit Fans--Each fan is supported by a

formed-wire mount bolted to the fan deck and covered with a

wire guard. On the 38AQS016, the exposed end of the motor

shaft is covered with a rubber boot. In case a fan motor must be

repaired or leplaced, be sure the rubber boot is put back on

when the fan is reinstalled and be sure the fan guard is in place

before stmting the unit.

Lubrication--Fan motors have permanently sealed

bemings. No further lubrication is required.

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Carrier 38AQ Specifications Page 24

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