Wiring; System Charging; System Evacuation - Pro Refrigeration CHILSTAR Series Operation Manual

Packaged Glycol Chiller Systems | 7
7. Remove any piping debris, ushed from tank and process piping. Do not turn the chiller switch on until all
debris has been removed from the system.

WIRING

1. Select or install an adequate electrical service to handle chiller load. Service must comply with all applicable
electrical codes. Refer to the MCA (Minimum Circuit Ampacity) rating recorded on the blue chiller identi cation
label in your chiller's electrical control panel.
2. If not factory installed, an electrical disconnect switch should be installed adjacent to chiller control panel.
3. After electrical service has been properly connected to the chiller, chiller should be energized for at least 24 hr. to
allow crankcase heaters to boil out any liquid refrigerant which may have migrated to compressor during shipment.
4. Check all motors for proper rotation. Pump motors must rotate clockwise when inspected from motor end
(the end where wire connections are made). To change pump motor rotation, reverse the L1 with L3 power wires.
Compressors can operate in either rotation, unless noted on compressor housing.

SYSTEM EVACUATION

(for remote air cooled condensers or remote condensing
units)
1. With refrigeration piping completed and pressure checked, the system is ready for evacuation. Do not use com-
pressor to evacuate system. A quality vacuum pump capable of a 350 micron evacuation is necessary for adequate
and dependable system vacuum. Moisture and contaminants in the system not removed by proper evacuation can
cause corrosion on compressor windings, expansion valve freeze-up, oil sludge, and high discharge pressures.
2. Attach vacuum pump to low and high side of system through compressor service valves. If check valves are pres-
ent, insure that vacuum lines are attached to both sides of check valves. Evacuate to 350 microns. A micron reading
device is necessary to ensure that no moisture or contaminants are present before system is charged with refriger-
ant.NOTE: All of the remote air cooled and remote condensing unit chillers leave the factory with a dry nitrogen
holding charge. If system is not pressurized on arrival, re-pressurize with dry nitrogen and leak check system before
beginning the refrigeration piping installation.

SYSTEM CHARGING

1. With system evacuated to 350 microns or less, chiller is ready to be charged with refrigerant. All charging lines,
hoses and manifolds must be purged with refrigerant to prevent non condensable from being introduced to system.
2. Connect charging line to liquid line access ttings and admit liquid refrigerant into system until ow stops due
to pressure equalization between cylinder and system.
3. Connect charging line to suction tting up stream of accumulator and admit vapor into low side of system.
4. Energize equipment to the refrigeration circuit and continue to admit vapor into low side of system until refrig-
erant liquid line sightglass clears. (It may be necessary to defeat low pressure freeze control on initial start-up to
prevent nuisance cycling of compressor until pressure is above low pressure cut out set point).