Specifications
46
JOHNSON CONTROLS
Form 201.28-NM1.EN.PED/CE (0211)
COMMISSIONING
Avoid levels in either oil separator that are above the
middle of the top sight glass. This may cause excessive
oil carryover in the system. High oil concentration in
the system may cause nuisance trips resulting from
incorrect readings on the level sensor and temperature
sensors. Temperature sensor errors may result in poor
liquid control which will result in liquid overfeed
and subsequently damage the compressor. High oil
carryover may also cause liquid to be returned to the
compressor, which can damage the compressor.
Fans
Check that all fans are free to rotate and are not
damaged. Ensure blades are at the same height when
rotated. Ensure fan guards are securely fixed.
Isolation / Protection
Verify all sources of electrical supply to the unit are
taken from a single point of isolation. Check that
the maximum recommended fuse sizes given in the
“Technical Data” section has not been exceeded.
Control Panel
Check the panel to see that it is free of foreign materials
(wire, metal chips, etc.) and clean out if required.
Power Connections
Check that the customer power cables are connected
correctly to the terminal blocks or optional 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.
Water System
Verify the chilled liquid system has been installed
correctly, and has been commissioned with the correct
direction of water flow through the cooler. The inlet
should be at the bottom connection on a two pass 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,
precautions must be taken. If there is a possibility
of liquid freezing due to low ambient temperatures,
the cooler 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
-28.9°C (-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 30°C
[86°F]) 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 five 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.
Programmed Options
Verify that the options factory-programmed into the
Micro Panel are in accordance with the customer’s
order requirements by pressing the OPTIONS key on the
keypad and reading the settings from the display.
Programmed Settings
Ensure the system cutout and operational settings are in
accordance with the operating requirements by pressing
the PROGRAM key.
Date and Time
Program the date and time by first ensuring that the CLK
jumper JP2 on the Chiller Control Board is in the ON
position. Then press the DATE/TIME key and set the date
and time (see Section 8 Date/Time and Schedule Keys).
Start/Stop Schedule
Program the daily and holiday start/stop by pressing the
SCHEDULE key (see Section 8 Schedule Key).