24
WGS 130A to 190A
OM WGS-5
3.
Verify that the compressor sump heaters have operated for at least 12 hours prior to
start-up. Crankcase should be warm to the touch.
4.
Check that the MicroTech II controller is set to the desired chilled water temperature.
5.
Start the system auxiliary equipment for the installation by turning on the time clock,
ambient thermostat and/or remote on/off switch and water pumps.
6.
Switch on the unit circuit breakers.
7.
Set circuit switches CS1 and CS2 to ON for normal operation.
8.
Start the system by setting the unit system switch S1 to ON.
9.
After running the unit for a short time, check the oil level in each compressor, rotation
of condenser fans (if any), and check for flashing in the refrigerant sight glass.
Weekend or Temporary Shutdown
Move circuit switches CS1 and CS2 to the OFF pumpdown position. After the compressors
have shut off, turn off the chilled water pump if not on automatic control from the chiller
controller or building automation system (BAS). With the unit in this condition, it will not
restart until these switches are turned back on.
Leave on the power to the unit (disconnect closed) so that the sump heaters will remain
energized.
Start-up after Temporary Shutdown
1.
Start the water pumps.
2.
Check compressor sump heaters. Compressors should be warm to the touch.
3.
With the unit switch S1 in the ON position, move the circuit switches CS1 and CS2 to
the ON position.
4.
Observe the unit operation for a short time, noting unusual sounds or possible cycling of
compressors.
Extended Shutdown
1.
Close the manual liquid line shutoff valves.
2.
After the compressors have shut down, turn off the water pumps.
3.
Turn off all power to the unit.
4.
Move the unit control switch S1 to the OFF position.
5.
Close the discharge shutoff valves.
6.
Tag all opened disconnect switches to warn against start-up before opening the
compressor suction and discharge valves.
7.
Drain all water from the unit evaporator, condenser and chilled water piping if the unit
is to be shut down during the winter and exposed to below-freezing temperatures. To
help prevent excessive corrosion, do not leave the vessels or piping open to the
atmosphere over the shutdown period.
Summary of Contents for WGS130AA: WGS140AW
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