Lg Scroll Compressor; Characteristics Of The Lg Scroll Compressor - Bryant Base Series Application Manual And Service Manual

Residential Air Conditioners and Heat Pumps Using R-22 and Puron® Refrigerant: Application Guideline and Service Manual
The compressor is equipped with an internal pressure relief port. The
pressure relief port is a safety device, designed to protect against
extreme high pressure. The relief port has an operating range between
550 to 625 psi differential pressure for Puron and 350 to 450 psi
differential pressure for R-22. Scrolls have a variety of shut down
solutions, depending on model, to prevent backward rotation and
eliminate the need for cycle protection.

LG SCROLL COMPRESSOR

The compressors used in these products are specifically designed to
operate with designated refrigerants and cannot be interchanged.
LG produced scroll compressors are designed to operate and function as
the typical orbiting scroll on a fixed scroll design. Refrigerant flow and
compression is basically the same.

Characteristics of the LG Scroll Compressor:

Internal Motor Overload Protection (OLP):
protection system sensing both motor winding temperature and motor
current. This is designed to open the common wire on single phase units
and stop the motor operation if motor high temperature or over current
conditions exist. Trip of the OLP opens the common line.
Vacuum protection device: If the suction side of the compressor is
blocked or limited, an extremely low vacuum situation is formed by the
optimum efficiency of the scrolls. The high vacuum pressure causes the
arc at the internal power terminal and cause tripping of the internal
overload or breaker or damage to the compressor. This compressor is
equipped with internal protection that opens if this high vacuum
condition exists and bypasses high pressure gas to the low pressure and
the internal overload may trip. In the case of refrigerant pump down, the
unit can operate with pump down but this protection may not allow the
refrigerant to be pumped down completely.
Internal Pressure Relief (IPR): The internal pressure relief is located
between the high and low pressure of the compressor and is designed to
open when the difference of the suction and discharge pressure is
(55-550 psid (35.1-38.7 kg/cm2). When the IPR valve opens, the high
temperature gas bypasses into the motor area and will trip the motor
OLP.
Quiet Shut Down Device: The LG scroll has a shut down device to
efficiently minimize the shut down sound. The reversing sound is
minimized by a check valve located in the discharge port of the scroll
sets. This slows the equalization of the high side to low side upon shut
down to prevent the scrolls from operating backwards.
Discharge Temperature Protection:
temperature is monitored by a temperature sensor mounted on the top
cap of the compressor. Wire diagrams may refer to this as a discharge
temperature switch (DTS). This is to protect against excessively high
scroll temperatures due to loss of charge or operating outside the
compressor envelope. This temperature sensor opens to stop the
compressor if temperatures exceed 239-257°F (115-125°C) and resets at
151-187°F (66-86°C). The DTS will break the Y signal in the 24 volt
circuit if it trips open.
Test sensor wires for continuity, open above 239-257F°F (115-125°C)
and resets at 151-187°F (66-86°C).
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
This is an inherent
The compressor discharge
21
If replacement is deemed necessary, perform the following to replace
sensor:
1. Locate top cap and discharge temperature sensor
2. Carefully remove sensor cover
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