Carrier 38AQ Specifications download pdf (Page 23)

5. Remove screws fiom compressor mounting plate.

Excessive movement of copper lines at compressor may

cause higher levels of vibration when unit is restored to

service.

6. Remove or disconnect crankcase heater from compressor

base.

7. Remove compressor from unit.

8. On 38AQS016 unit remove compressor holddown bolts

and lift compressor off mounting plate.

9. Clean system. Add new liquid line filter &ier

10. Install new compressor on compressor mounting plate

and position in unit. Connect vapor and discharge lines to

compressor. Secure mounting plate with compressor to

unit. Ensure that compressor holddown bolts are in place.

Connect wiring. Install crankcase heatel:

11. Evacuate and rechmge unit.

12. Restore unit powel:

38ARQ008, 012 Cooling Mode Operation

(See Fig. 20)

1. High pressure, high temperature refrigerant vapor from

the compressor flows through the reversing v_flve and is

directed to the vapor headel:s of both outdoor coils.

2. At the outdoor coil vapor header, 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.

3. Subcooled refrigerant liquid leaves the coil circuits

through the side outlet on the liquid headers. The liquid

refrigerant from each coil flows through check valves

"B" which are open, 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 vapol: This low

pressure vapor returns to the outdoor unit through the

system vapor line, reversing valve, and accumulatol:

reentering the compressor at the suction connection.

38ARQ008, 012 Heating Mode Operation

(See Fig. 21)

1. High pressure, high temperature refrigerant vapor from

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 liquid

refrigerant must flow through the filter driers, through

check v_dve "C", and into the liquid header assembly.

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

fixed orifice metering devices into outdoor coil circuits.

The refrigerant evaporates as it passes through the coil

circuits resulting in low plessure vapol:

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

the vapor headers, check valves "A" are open, and returns

to the compressor through the vapor line, revelling valve,

and accumulator, reentering the compressor at the suction

connection.

COMPRESSOR _ REVERSING VALVE

_M ULAT4(_OR _ VAPO_'_RLINE

vel

FIXED ORIFICE

METERING DEVICE

FILTER

DRIER

LIQUID LINE

Fig. 20 -- 38ARQ008, 012 Cooling Mode (Size 008 Shown)

FROM

[_]ZZZ1 INDOOR

UNIT

BALL

VALVE

[_INDOOR

UNIT

BALL

VALVE

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 31 32

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Carrier 38AQ Specifications Page 23

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