FORM 150.66-CL2 (820)
2
JOHNSON CONTROLS
Control Panel
Check the panel to see that it is free of foreign materials
(wire, metal chips, or similar materials) and clean out
if required.
Power Connections
Check that the customer power cables are connected cor-
rectly to the terminal blocks or optional circuit breaker.
Ensure that connections of power cables within the pan-
els 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 limits.
Refer to Technical
Data Section in IOM (150.66-NM2).
PREPARATION – POWER ON
Perform the commissioning using the
detailed checks outlined in the
Equipment Startup Checklist 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
Ensure 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 discon-
nection devices can now be set to ON.
Verify the control panel display is illuminated.
Ensure
the system switches under the SYSTEM SWITCHES
Key are in the OFF position.
Compressor Heaters
Verify the compressor heaters are energized. If the ambi-
ent 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 com-
pressor 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 cor-
rectly, and has been commissioned with the correct di-
rection of water flow 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 limits.
Refer to the
Technical Data Section of the IOM (150.66-
NM2).
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, discharge and economizer service stop
valves should be closed (clockwise). If there is a pos-
sibility of liquid freezing due to low ambient tempera-
tures, 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 flow switch is correctly fitted 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 flow switch. The flow 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.
