Carrier Supra 650 Service Manual download pdf (Page 21)

1--8

62--10828

Loaded Operation

Discharge pressure bleeds from the discharge manifold

(Figure 1-8, item 15) through the strainer (9) and (8)

bleed orifice to the solenoid valve stem (2) chamber and

the back of the piston bypass valve (7).

With the solenoid valve (1) de-energized the solenoid

valve stem will close the gas bypass port (3).

Refrigerant pressure will overcome the bypass valve

spring (5) tension and force the piston (6) forward clos -

ing the gas bypass from the discharge manifold to the

suction manifold (10).

Cylinder discharge pressure will force open the dis-

charge piston check valve assembly (14). Refrigerant

gas will pass into the compressor discharge manifold.

The loaded cylinder bank will continue to operate fully

loaded until the solenoid valve control device is ener-

gized and the gas bypass port is opened.

1. Solenoid

alve

2. Valve Stem

3. Gas Bypass Port

4. Spring Guide

5. Spring

6. Piston

7. Piston Bypass Valve

8. Bleed Orifice

9. Strainer

10.Suction Manifold

11. Cylinder Discharge

Valve

12. Valve Plate

13. Cylinder Suction

Valve

14. Discharge Piston

Check Valve

Assembly

15. Discharge Manifold

Figure 1-8. Cylinder Head -- Loaded

c. Condenser/Subcooler

The condenser is of the tube and fin type and acts as a

heat exchanger in which the compressed refrigerant

gas is condensed into a liquid and lowered in tempera-

ture. Air movement over the condenser is provided by a

fan mounted on the standby motor/motor shell shaft.

A portion of the condenser is occupied by the subcooler.

Refrigerant leaving the receiver is passed through the

subcooler where additional heat is removed. Removal

of this additional heat helps to ensure that only liquid

refrigerant enters the thermal expansion valve.

d. Accumulator

The accumulator is a refrigerant holding tank located in

the suction line between the evaporator and compres-

sor. The purpose of the accumulator is to prevent entry

of any liquid refrigerant into the compressor.

Refrigerant vapor leaves the accumulator outlet pipe at a

point well above any liquid level thus preventing the en-

trance of liquid. The outlet pipe is equipped with an orifice

that controls oil return to the compressor and prevents

accumulation of oil within the tank.

From

evaporator

To compressor suction

Oil return orifice

Figure 1-9 Accumulator

e. Compressor Pressure Regulating Valve (CPR)

This adjustable regulating valve regulates the suction

pressure entering the compressor. The suction pres-

sure is controlled to avoid overloading the electric motor

or engine during high box temperature operation.

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Comments to this Manuals

Hermes Hurtado 13 Mar 2025 | 11:43:58

Soy mecánico mantenedor. Necesito manuales técnicos

Carrier Supra 650 Service Manual Page 21

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