Start-Up Pre Start-Up - LG RCAW Operation & Maintenance Manual

START-UP
Pre Start-Up
Do not attempt to start the chiller until the following checks have been completed.
• Check auxiliary facilities, such as the chilled water circulating pump, air-handling equipment, or other equip-
ments to which the chiller supplies liquid are operational. Consult manufacturer's instructions. If the unit has
field-installed accessories, be sure all are properly installed and wired correctly. Refer to unit wiring diagrams.
• Open compressor suction and discharge shutoff valves.
• Open liquid line, oil line, and economizer service valves.
• Fill the chiller fluid circuit with clean water (with recommended inhibitor added) or other non-corrosive fluid to
be cooled. Bleed all air out of high points of system. An air vent is included with the cooler. If outdoor tempera-
tures are expected to be below 32°F(0°C), sufficient inhibited propylene glycol or other suitable corrosion inhib-
ited antifreeze should be added to the chiller water circuit to prevent possible freeze-up. The chilled water loop
must be cleaned before the unit is connected.
• Check and inspect all water piping. Make sure flow direction is correct and that piping is made to the correct
connection on evaporator and condenser. Open all water flow valves to the evaporator.
• Turn on the chilled water pump manually, measure the water pressure drop across the evaporator, and check
that water flow is correct per the design flow rates.
• Check all electrical connections in control panel to be sure they are tight and provide good electrical contact.
Connections are tightened at the factory, but can loosen enough in shipment to cause a malfunction.
• Check the actual line voltage to the unit to make sure it is the same as called for on the compressor name-
plate, within + 10%, and that phase voltage unbalance does not exceed 5%. Verify that adequate power supply
and capacity is available to handle load.
To determine percent voltage imbalance: The maximum voltage deviation is the largest difference between a
voltage measurement across 2 legs and the average across all 3 legs.
• Verify power supply phase sequence. Fan motors are 3 phase. Check rotation of fans by using the quick test.
Fan rotation is counterclockwise as viewed from top of unit. If fan is not turning counterclockwise, reverse 2 of
the power wires at the main terminal block.
• Oil separator heaters must be firmly seated under the oil separator, and must be energized for 24 hours prior
to start-up. The oil separator should be warm to touch.
• If wind velocity is expected to be greater than 8 km/h wind baffles and brackets must be field-fabricated.
Operation & Maintenance Manual 31
Start-up