Preparation - Power On; Switch Settings; Compressor Heaters; Water System - York YCAL0012EC Installation Operation & Maintenance

PREPARATION – POWER ON
Perform the commissioning using
the detailed checks outlined in the
EQUIPMENT START-UP CHECK
SHEET as the commissioning proce-
dure 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 discon-
nection devices can now be set to ON.
Verify the control panel display is illuminated.
the system switches under the SYSTEM SWITCHES
Key are in the OFF position.

Compressor Heaters

Verify the compressor heaters are energized. If the am-
bient 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 the limits
given in the Technical Data Section. Operation outside
of these limits is undesirable and could cause damage.
JOHNSON CONTROLS
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 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)

Assure
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.
FORM 150.66-NM2 (906)
5
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