Specifications

30 YORK INTERNATIONAL
Low Temperature Brine Chillers
% Verify the freeze point of the brine in the evapora-
tor. Use a hand-held optical refractometer or a
hydrometer.
% Make certain the Brine Low Evaporator Pressure
Cutout Threshold* Setpoint (EVAPORATOR
screen) is set above the brine freeze point.
High Pressure Safety Switch
% Verify the setpoint of the high-pressure safety
switch. Reconfirm the High Pressure Limit/Warn-
ing threshold setpoint (CONDENSER screen).
Compressor
% Make certain the incoming electrical power dis-
connect is in the open position.
% Remove one of the access cover plates located
on the D-Flange Motor-Compressor spacer cast-
ing. Check the coupling bolts to make certain they
are tight. Check the Allen head set screws in the
coupling hubs to make certain they are tightened.
% Rotate the compressor several revolutions by hand.
COMPRESSOR SCREEN
Maximum Load
c Maximum Load Temperature
c Maximum Load FLA
c Select Minimum Load Control Source
(Slide Valve Position or % Motor FLA)
c If Motor FLA selected, enter Minimum
Load FLA
SLIDE VALVE CALIBRATE SCREEN
c Perform Slide Valve Calibration
Note the slide valve can be calibrated with the
chiller off or while it is running. To perform the
slide valve calibration while the chiller is off, it is
necessary to use a hand pump to pump oil into
the slide valve cylinder to move the slide valve
from 0% to 100%. The slide valve can also be
calibrated with the chiller running; however, there
must be enough available load for the chiller to
be loaded to 100% capacity. Refer to Service
Manual 160.80-M1, Graphic Control Center,
for more information.
Motor
% Check the voltage supply to make certain it is the
same as the Motor Nameplate Data.
% Megohm the motor. Follow the instructions for
Motor Megohm Check on page 52.
% Lubricate the motor bearings. Follow the motor
manufacturer instructions.
% Check motor rotor rotation. All YS Chillers rotate
clockwise when viewed facing the compressor
shaft.
MOTOR SCREEN
Program the following setpoints:
c Local Motor Current Limit
c Pulldown Demand Limit
c Pulldown Demand Time
Motor Starter
For YORK Solid State Starter, Mod “B”, program the
following setpoints:
c Full Load Amps*
c Start Current*
c Supply Voltage Range*
c Enable Open SCR Detection
c KWH Reset
For YORK Solid State Starter, Mod “A”, program the
following setpoints:
c Full Load Amps*
c Supply Voltage Range*
c Current Unbalance Check ENABLE/DISABLE
Logic Board:
c Verify location of 300V/600V Jumper*
c Verify Start Current Calibration*
c Verify 105% FLA Calibration
For YORK Electro-Mechanical Starter Applications:
Current Module:
c Verify Switch S1 (Wye-Delta 57% or all others)
Setting
c Verify Pot R16 (LRA/FLA ratio) Setting*
c Verify Slide Bar Resistor “RES” Setting*
c Verify 105% FLA Calibration*
c Verify 100% FLA Calibration*
Start-Up