Technical information

Page: 18
VL Series Portable Chillers, 2 to 40 Tons UGH021/0301
3.1 GENERAL
A. Failure to follow the factory required operations procedure may
adversely affect the unit’s ability to adequately control process
temperature and may create a hazardous operating condition
which may result in serious operator injury and/or unit damage.
B. IMPORTANT: each chiller is equipped with a crankcase heater on
the compressor. While the compressor is idle, the crankcase heater
prevents freon vapor from migrating to and condensing in the
compressor crankcase. If freon is allowed to condense in the
crankcase, it can be drawn into the cylinders upon start up. This
can cause catastrophic damage to the connecting rods, pistons,
and valve plates. To avoid this, BEFORE THE UNIT IS STARTED,
THE POWER SUPPLY SHOULD BE APPLIED TO THE UNIT FOR AT
LEAST 12 HOURS, OR UNTIL THE BOTTOM OF THE
COMPRESSOR IS WARM TO THE TOUCH. If the power has been
disconnected more than two hours, the power should be applied
for six hours before restarting. Power should be applied to the unit
continuously, except for service purposes. The crankcase heater
should be checked for proper operation on a regular basis.
C. The OPERATIONS segment of this manual is divided into the
following sections:
3.2 Start up/operations - follow this segment to start the unit
after the initial install to the process system or to restart the
unit after reinstallation to the same or different process
system. This section includes information on system fill,
electric motor phasing (pump rotation) and process flow
adjustments.
3.3 Instrument - follow this segment to start up and operate
the instrument. This section includes information on
setpoint selection and adjustment, and feature
explanations.
3.4 Shut down procedure - follow this segment to shut down
the unit. This segment includes information on system shut
down, electrical power supply precautions, and
disconnection from system.
3.2 START UP/OPERATION PROCEDURE
A. SYSTEM FILL
1. The VL series portable chiller has an internal reservoir which
must be filled and maintained for proper operation. All VL
series chillers have a level switch mounted at the proper
water level in the reservoir.