Carrier Supra 650 Service Manual download pdf (Page 22)

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f. Hot Gas Solenoid Valve (Three-Way Valve)

The Hot Gas Valve (HGS1) directs flow of refrigerant

through the system. With the solenoid coil de-energized

the valve is in the cool mode and the compressor dis-

charge gas is delivered to the condenser. In the cool

mode, heat is removed from the air inside the truck body

and rejected to the surrounding air. With the solenoid

coil energized the valve is in the heat mode and the

compressor discharge gas is diverted to the evaporator.

In the heat mode, heat is removed from the air surround-

ing the truck body and rejected to the air inside the truck

body. A description of valve operation is provided in the

following sub-paragraphs.

Cooling Operation

(See Figure 1-10.)

With the solenoid coil de-energized the valve is in the

cool operating mode and the refrigerant gas is diverted

to the condenser. The volume directly above the piston

assembly is open to suction pressure through the exter-

nal pilot connection and the volume underneath the pis-

ton assembly is open to discharge pressure through the

compressor discharge connection. This difference in

pressure across the piston assembly results in the pis-

ton assembly being shifted upward, shutting the heat

and defrost port, opening the condenser port, and allow-

ing refrigerant to flow to the condenser.

SOLENOID

DE-ENERGIZED

TO COMPRESSOR

SUCTION

FROM

COMPRESSOR

TO CONDENSER

TO EVAPORATOR

Figure 1-10. Hot Gas Valve -- Cooling Flow

Heat and Defrost Operation (See Figure 1-11.)

When the hot gas solenoid coil is energized, discharge

gas flows to the evaporator for heating or defrost. When

energized, the solenoid plunger is lifted, allowing dis-

charge gas to fill the volume above the piston assembly.

Discharge gas is also allowed to fill the volume below the

piston assembly through the compressor discharge

connection. The pressure on both sides of the piston

assembly is now equal and the piston spring exerts a

force on top of the piston assembly and shifts it down-

ward. The condenser port is now closed and the evapo-

rator port is open. In both the energized and de-ener-

gized positions, the bypass of discharge gas to the suc-

tion port is prevented.

From

compressor

To evaporator

Solenoid

energized

Figure 1-11. Hot Gas Valve -- Heat and Defrost

Flow

g. Hot Gas Bypass Solenoid Valve (except 950)

The hot gas bypass solenoid valve (HGS2) opens dur-

ing heating and allows the compressor to draw vapor

from the top of the receiver resulting in increased heat-

ing capacity.

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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 22

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