GSX14 Service Manual

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PRODUCT DESIGN

CAPACITY CONTROL - LEGACY MODELS

During the compression process, there are several pockets

within the scroll that are compressing gas. Modulation is

achieved by venting a portion of the gas in the first suction

pocket back to the low side of the compressor thereby

reducing the effective displacement of the compressor. See

Figure A. Full capacity is achieved by blocking these vents,

increasing the displacement to 100%. A solenoid in the

compressor, controlled by an external 24-volt ac signal,

moves the slider ring that covers and uncovers these vents.

The vent covers are arranged in such a manner that the

compressor operates somewhere around 67% capacity when

the solenoid is not energized and 100% capacity when the

solenoid is energized. The loading and unloading of the two

step scroll is done “on the fly” without shutting off the motor

between steps. See Figure B below. The unloaded mode

default was chosen for two reasons:

FIGURE B

1. It is expected that the majority of run hours will be in the

low capacity, unloaded mode.

2. It allows a simple two-stage thermostat to control capac-

ity through the second stage in both cooling and possibly

heating if desired.

UNLOADER SOLENOID

A nominal 24-volt direct current coil activates the internal

unloader solenoid. The input control circuit voltage must be

18 to 28 volt ac. The coil power requirement is 20 VA. The

external electrical connection is made with a molded plug

assembly. This plug is connected to the Comfort Alert™ or

CoreSense™ Module (dependent upon which module you are

using) which contains a full wave rectifier to supply direct

current to the unloader coil.

CAPACITY CONTROL - COMFORTNET

MODELS

During the compression process, there are several pockets

within the scroll that are compressing gas. Modulation is

achieved by venting a portion of the gas in the first suction

pocket back to the low side of the compressor thereby

reducing the effective displacement of the compressor. See

Figure A. Full capacity is achieved by blocking these vents,

increasing the displacement to 100%. A solenoid in the

compressor, controlled by an external 24-volt ac signal,

moves the slider ring that covers and uncovers these vents.

The vent covers are arranged in such a manner that the

compressor operates somewhere around 67% capacity when

the solenoid is not energized and 100% capacity when the

solenoid is energized. The loading and unloading of the two

step scroll is done “on the fly” without shutting off the motor

between steps. See Figure C below. The unloaded mode

default was chosen for two reasons:

Molded Plug*

Line

Run Capacitor

Internal Unloader

Coil

24 VAC

*Rectifier is integrated on the UC PCB

FIGURE C