Specifications

50
PRE-START-UP PROCEDURE
Do not attempt to start the chiller until the following checks have
been completed.
System Check
1 - Check all auxiliary components such as the chilled fluid
circulating pump, air-handling equipment, or other equipment
to which the chiller supplies liquid. Consult the manufacturer’s
instructions. If the unit has field-installed accessories, be sure
all are properly installed and wired correctly. Refer to the unit
wiring diagrams.
2 - Check the cooler flow switch for proper configuration and
operation (<8> <STAT> from HSIO II). Ensure the switch
closes when the pump is on and opens when the pump is
turned off.
3 - Open the discharge and liquid valves in each circuit.
4 - If suction valve is installed, open the suction service valves in
each circuit. Service valve is located below the compressor in
the cooler suction connection flange.
5 - Open the oil shut off valves located by the oil pre-filter.
6 - Check the tightness of all electrical connections.
7 - Check to ensure the unit is level per the installation instructions.
8 - Check the incoming power supply for proper phasing. This
can be done by turning on both the line voltage and control
voltage power supplies. Leave the LOCAL/OFF/REMOTE
switch in the OFF position. If the incoming power is not
phased correctly, the CPM will generate an alarm for voltage
phase reversal. Press <1> <STAT> at the HSIO II to check for
this alarm. If this alarm is present, shut down power supplies
and switch any two incoming power leads at the control box
terminal block.
ATTENTION
DO NOT make any changes to the factory installed compressor
power wiring in the control box or at the compressor junction
box. Doing so will cause permanent damage to the compressor
and will require compressor replacement.
9 - Check all field configuration data and setpoints.
10 -Enter correct date, time and operating schedule(s).
11 -Verify operation of solenoids, pumps, valves, compressors,
etc. as listed in the Checklist.
12 -Check incoming power supply for proper nameplate voltage
and for any voltage imbalance as defined below.
13 -Open condenser water valves. Check condenser water pump
for proper operation.
START-UP AND OPERATION
Actual Start-up
Actual start-up should be done only under supervision of a
qualified refrigeration mechanic.
1 - Set leaving fluid temperature. No cooling range adjustment is
necessary.
2 - Start chilled fluid pump.
3 - Switch LOCAL/OFF/REMOTE switch to LOCAL or
REMOTE.
4 - Provided there is a load on the chiller, allow the machine to
operate and confirm that everything is functioning properly.
Verify that the leaving fluid temperature agrees with the
cooling setpoint (1 or 2), or if reset is being used, the modified
setpoint. Chiller is controlling to the Control Point displayed
under <2> <STAT>.
Operating Sequence
The chiller is started by switching the LOCAL/OFF/REMOTE
switch to either LOCAL or REMOTE. On a command for cooling,
the oil pump will be turned on to start the pre-lubrication process.
After a short period of time, the oil solenoid will be opened and
the control will read the oil pressure from the transducer and
determine if sufficient pressure has been built up. If there is not
sufficient pressure, an alarm will be generated and the compressor
will not be started. Upon building pressure, the compressor will
be allowed to start. For across the line (XL) start chillers, the
compressor will start and come up to full speed within 1-3 seconds.
For star delta start chillers, contactors KM1 and KM1-B (starter
contactor assembly) will be closed and the compressor will be
started in a Wye configuration. This method reduces the locked
rotor current requirements by approximately 60%, while
maintaining enough torque to bring the compressor up to full
speed. After 6-8 seconds, the CPM module will switch out
contactor KM1-B and bring in contactor KM1-A which will run
the motor in a Delta configuration (same configuration that XL
units run).
Once the compressor is successfully running, the control will load
the compressor and add additional stages of capacity as needed
to satisfy the leaving fluid setpoint. Head pressure can be
controlled with a field installed condenser water valve.