LG AR-DR12-05A Installation And Operation Manual page 42

FACTORY-INSTALLED REFRIGERATION SYSTEM
COMPONENTS
12. Thermostatic Expansion Valve (TVX): Each unit is equipped with a TVX on each refrigerant circuit. The valve controls the
flow of liquid refrigerant entering the evaporator coil by maintaining a constant, factory-set superheat of 10°F. The valve is
adjustable and is located on the side of the evaporator coil and can be accessed through the coil access panel.
13. Evaporative Coil
14. Low Limit Pressure Switch: The switch is installed on the suction line and disables the DX system when the suction pres-
sure drops below the set point. The switch will auto reset when the pressure rises above the auto-reset set point.
15. Service Access Ports
16. Hot Gas Bypass Manual Shut Off Valve (Optional): Used to disable hot gas bypass for service and troubleshooting proce-
dures.
17. Hot Gas Bypass Valve (Optional): On units equipped with hot gas bypass, hot gas from the compressor is injected into the
liquid line of the evaporator coil after the TVX.
18. Valve Adjustment: To adjust the valve, connect a pressure gauge to the suction line and block the entering air to the
evaporator coil. The valve should begin to open when the suction pressure drops to approximately 115 PSIG for R-410A
(the valve will feel warm to the touch). Adjustments are made by first removing the cap on the bottom of the valve and then
turning the adjusting stem clockwise to increase the setting pressure (counterclockwise to decrease). Allow several minutes
between adjustments for the system to stabilize. When adjustment is complete, replace the cap on the valve.
19. Pressure Gauge & Transducer (Optional EC condenser fans only): See Optional Electronically Commutated (EC) Con-
denser Fans under the component operation.
42
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.