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WARNING: Ethylene Glycol is flammable at higher
temperatures in a vapor state. Carefully handle this
material and keep away from open flames or other
possible ignition sources.
Step 3 - Condenser Water Temperature and
Flow
Check the condenser water lines to make sure all
connections are secure. Make sure sufficient
condenser fluid flow and pressure are available, and
all shut-off valves are open. The chiller includes a
factory mounted condenser water-regulating valve
to regulate condenser water flow to maintain the
proper refrigerant pressures. The electronic water
regulating valve ships in the closed position and
opens after enabling the circuit. The nominal design
is for 220 gpm of 40% ethylene glycol or water @
85°F entering the condenser with a 10 psi pressure
drop. The chiller will start and operate with inlet
water temperatures between 55°F and 95°F. The
actual flow requirements will vary.
Step 4 – Check Refrigerant Valves
During shipment or installation, valves are
sometimes closed. Verify that all refrigerant valves
are open.
Step 5 – Check Low Temperature Alarm
Make sure the Low Temperature Alarm Set Point is
proper for the operating conditions of the chiller.
The Low Temperature Alarm setting is in a
password-protected menu of the chiller controller.
Refer to the control section of this manual for
instructions on how to access this menu. Set the Low
Temperature Alarm 10°F below the minimum chilled
water temperature setting that the chiller will be
operating. Also, ensure the process coolant has
sufficient freeze protection (glycol) to handle at least
5°F below the Low Temperature Fault setting. All
chillers ship with the Low Temperature Fault set at
38°F. This protects against a possible freeze-up if no
glycol is present. Once the proper glycol solution is
present, adjust the Low Temperature Fault to the
appropriate setting.
CAUTION: The manufacturer’s warranty does not
cover the evaporator from freezing. It is vital that the
Evaporator Low Temperature Fault is set properly.
Step 6 – Turn On Control Power
Turn on the control power by turning the control
power switch to "On.” The panel should be on. Due
to extreme ambient temperatures during shipment
and installation, you may encounter a High
Refrigerant Pressure alarm when you turn on the
control power. If this is the case, reset the alarm and
wait until no further alarm conditions are present.
Step 7 – Establish Coolant Flow
Establish flow through the chiller.
Note: The compressor will not start as long as the flow switch is
open. The compressor only operates if there is a positive flow
through the evaporator.
Set flow using a discharge throttling valve or flow
control valve (by others). The valve should be the
same size as the To Process connection of the chiller.
The nominal flow rates of the chiller are 467 gpm of
40% ethylene glycol @ 10°F setpoint with a 16 psi
pressure drop and 427 gpm of 40% ethylene glycol
@ 15°F set point with a 12 psi pressure drop.
Step 8 – Initial Chiller Operation
Enter the desired leaving fluid temperature on the
chiller HMI. The chiller has an intended operating
range of 10°F to 15°F and a set point range of 10°F
to 55°F. Under normal operation, the entering water
temperature should not exceed 80°F; however, the
chiller can start and operate short-term with
entering fluid temperatures up to 90°F to allow the
chiller to pull down the temperature of a reservoir or
process fluid loop on start-up. The chiller should
now be controlling to the selected temperature.
Please note that if there is insufficient load the
compressor may cycle on and off causing swings in
temperature.
WARNING: Under no circumstance, deactivate the
High Refrigerant Pressure or the Low Compressor
Pressure switches. Failure to heed this warning can
cause serious compressor damage, severe personal
injury, or death.
