JOHNSON CONTROLS
122
FORM 150.67-NM2 (209)
Commissioning
Supply Voltage
Verify that the site voltage supply corresponds to the
unit requirement and is within the limits given in the
Technical Data Section.
PREPARATION – POWER ON
Perform the commissioning using the
detailed checks outlined in the EQUIP-
MENT START-UP CHECK SHEET
as the commissioning procedure is
carried out.
Apply power to the chiller. Turn ON the option panel
circuit breaker if supplied.
The machine is now live!
Switch Settings
\
Assure the chiller OFF/ON UNIT switch at the
bottom of the keypad is OFF. Place the optional
circuit breaker handle on the panel door to ON. The
customer’s disconnection devices can now be set to
ON.
Verify the control panel display is illuminated.
Assure
the system switches under the SYSTEM SWITCHES
Key are in the OFF position.
Compressor Heaters
\
Verify the compressor heaters are energized. If
the ambient temperature is above 96 °F (36 °C) the
compressor heaters must be on for at least 8 hours
before start-up to ensure all refrigerant liquid is driven
out of the compressor and the oil. If the ambient
temperature is below 86 °F (30 °C), allow 24 hours.
Water System
Verify the chilled liquid system has been installed
correctly, and has been commissioned with the correct
direction of water
fl
ow through the cooler. The inlet
should be at the refrigerant piping connection end of
the cooler. Purge air from the top of the cooler using
the plugged air vent mounted on the top of the cooler
body.
Flow rates and pressure drops must be within the
limits given in the Technical Data Section. Operation
outside of these limits is undesirable and could cause
damage.
If mains power must be switched OFF for extended
maintenance or an extended shutdown period, the
compressor suction, discharge and economizer service
stop valves should be closed (clockwise). If there is
a possibility of liquid freezing due to low ambient
temperatures, the coolers should be drained or power
should be applied to the chiller. This will allow the
cooler heater to protect the cooler from freezing down
to –20 °F. Before placing the unit back in service,
valves should be opened and power must be switched
on (if power is removed for more than 8 hours) for
at least 8 hours (24 hours if ambient temperature is
below 86 °F [30 °C]) before the unit is restarted.
Flow Switch
Verify a chilled water
fl
ow switch is correctly
fi
tted in
the customer’s piping on the cooler outlet, and wired
into the control panel correctly using shielded cable.
There should be a straight run of at least 5 pipe
diameters on either side of the
fl
ow switch. The
fl
ow
switch should be connected to terminals 2 and 13 in
the panel.
Temperature Sensor(s)
Ensure the leaving liquid temperature sensor is coated
with heat conductive compound (Part No. 013-00890-
000) and is inserted to the bottom of the water outlet
sensor well in the cooler. This sensor also provides
some freeze protection and must always be fully
inserted in the water outlet sensor well.
Summary of Contents for YCAL0019
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