LG Central Air Conditioning Remote Condensing Unit Installation Instructions & Use And Care page 14

SYSTEM OPERATIONAL CHECK
IMPORTANT: To prevent compressor damage which may result from the presence of LIQUID refrigerant in
the crankcase, these procedures should be followed at initial Start-Up and at anytime the power has been
off for 12 hours or more if the compressor uses a crankcase heater.
1. Place the thermostat's system switch in the "OFF" position and apply power by closing system dis-
connect switch. Allow the system to remain off, but with power supplied for a minimum of one hour if
compressor uses a crankcase heater.
OPERATING PRESSURES: After the unit has operated in the cooling mode for 15 minutes, install
pressure gauges on the gage ports of the liquid and Vapor valves. Check the Vapor and liquid line
pressures and compare them to the normal operating pressures provided in the unit's Service
Manual.
NOTE: TO CHARGE THE SYSTEM ACCURATELY, USE SUPERHEAT OR SUBCOOLING
METHOD DEPENDING ON THE FLOW CONTROL USED IN THE SYSTEM.
2. Except as required for safety while servicing: DO NOT OPEN SYSTEM DISCONNECT
SWITCH.
3. Measure and record the following:
Line voltage @ contactor during start-up
Compressor amperage
Condenser Fan Amperage
Vapor(Suction) Pressure
Liquid Line Pressure
Superheat
Sub-cooling
Outdoor temperature
Indoor temperature
SUPPLEMENTARY HEATERS CHECKOUT PROCEDURES, IF USED
DOES HEATER REQUIRE A SEPARATE CIRCUIT
4. Ensure that the disconnect switch is "OFF", and the safety label (if any) is attached
5. Check field wiring for sound connections and grounding according to codes
6. Check fuses or breakers for proper size per nameplate specifications
7. Check control box panel – in place and secured
NOTE: OPERATION OF HEATERS MUST BE CHECKED DURING THE OPERATION
CHECK OF THE TOTAL SYSTEM
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VAC
Amps
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PSIG
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