Troubleshooting Guide - York YCAV0267E Installation Operation & Maintenance

MAINTENANCE
(Always remove power to the chiller and assure the DC bus voltage has bled off)
PROBLEM
No Display on Control Panel.
Unit will NOT Run.
Line Fuse Blows.
Chiller Fault:
LOW AMBIENT
TEMPERATURE
Chiller Fault:
HIGH AMBIENT
TEMPERATURE
Chiller Fault:
LOW LEAVING
CHILLED LIQUID
System Fault:
CONTROL VOLTAGE
System Fault:
HIGH OIL
TEMPERATURE
332

TROUBLESHOOTING GUIDE

POSSIBLE CAUSE
Supply to the Panel
is missing.
Line Fuse is blown.
Chiller Control board is defective.
Display Board defective.
SCR Diode Module is defective.
IGBT Module is defective.
VSD Logic Board is defective.
SCR Trigger Board is defective
Ambient temperature is lower than
the programmed operating limit.
Ambient Sensor is defective.
Ambient Temperature
is above the maximum
operating limit.
Ambient Sensor is defective.
Leaving chilled liquid temperature
drops faster than the
unit can unload.
Chilled Water Sensor
is defective.
System Fuse is blown.
Oil Temperature
Sensor is defective.
Condensor Fans NOT
operating or running backwards.
Coils dirty.
FORM 201.21-NM3 (616)
ACTION
High Voltage to the
Chiller is missing.
Check 1FU, 2FU, 4FU, 5FU
17FU, or 19FU.
Check 2T or 10T Transformer.
Check Fuses.
Replace Chiller Control board
Replace Display Board
Check SCR/Diode Module.
Check IGBT Module.
Replace VSD Logic Board.
Replace SCR Trigger Board.
Check the programmed cutout and
determine if it is
programmed correctly
Check the panel against the
thermometer reading of
ambient temperature
Check outside air temperature.
Check the Panel Display against
Thermometer reading of
Ambient Temperature at the sensor.
Check for restricted flow.
Check for rapid flow changes.
Water loop is too small.
Flow is below minimum for chiller.
Check Sensor against
Temp. Gauge in water line.
Check Sensor for
intermittent operation.
Check Wiring for shorts or opens.
Check respective system
Fuse 20FU or 21FU.
Check Sensor with infrared to
determine if reading is reasonable.
Check Fans.
Check and clean Coils.
JOHNSON CONTROLS