Preparation - Power On - York YLAA Series Installation Operation & Maintenance

FORM 150.72-ICOM6
ISSUE DATE: 12/29/2017
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 diam-
eters on either side of the flow switch. The flow switch
should be connected to terminals 13 and 14 of XTBC1
on 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 in-
serted in the water outlet sensor well.
PREPARATION – POWER ON
Perform the commissioning using the
detailed checks outlined. See Equipment
Pre-Startup And Startup Checklist (Form
150.72-CL1) as the commissioning proce-
dure is carried out.
Apply power to the chiller. Turn on the option panel
circuit breaker if supplied.
JOHNSON CONTROLS
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 dis-
connection 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 compres-
sor 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.
SECTION 6 – COMMISSIONING
Assure
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