FORM NO.:6U6K-B01E-NB-EN
JOHNSON CONTROLS
94
the terminal blocks or circuit breaker. Ensure that connections
of power cables within the panels to the circuit breaker or
terminal blocks are tight.
Grounding
Verify that the unit’s protective ground terminal(s) are properly
connected to a suitable grounding point. Ensure that all unit
internal ground connections are tight.
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 START-UP CHECKLIST as
the commissioning procedure is carried out.
Apply power to the unit. Turn ON the panel circuit breaker.
The machine is now live!
Switch Settings
Assure the status of the unit is OFF. Place the circuit breaker
handle on the panel door to ON. The customer’s disconnection
devices can now be set to ON.
Water System
Verify the chilled liquid system has been installed correctly,
and has been commissioned with the correct direction of water
ow through the cooler. The inlet should be at the higher end of
the cooler. Purge air from the top of the water system using the
plugged air vent mounted on the top of the piping.
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 com- pressor
suction and discharge 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 unit. This will allow the cooler heater
to protect the cooler from freezing down to –20 °C. 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 before the unit is restarted.
Flow Switch
A unit flow switch has been fitted on the cooler outlet. If the
units are connected for central control, it is recommended
to install an additional flow switch on the main outlet. Make
sure the switch is 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 ow switch.
Temperature Sensor(s)
Leaving liquid temperature sensor is used for modular control.
Ensure the sensor is coated with heat conductive compound
and is inserted to the bottom of the water outlet sensor well in
the main pipe. This sensor also provides some anti-freezing
protection and must always be fully inserted in the water outlet
sensor well.
Control Supply
Verify the control panel display is illuminated.
SECTION 6 – COMMISSIONING
Cooke Industries - Phone: +64 9 579 2185 Email: sales@cookeindustries.co.nz Web: www.cookeindustries.co.nz
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