Quantech QTC4 STYLE A Series User Manual

SECTION 9 - MAINTENANCE
QUANTECH
153
FORM QTC4-NM1
ISSUE DATE: 4/2/2018
9
TABLE 25 - TROUBLESHOOTING GUIDE
PROBLEM POSSIBLE CAUSE ACTION
NO DISPLAY ON CONTROL
PANEL UNIT WILL NOT RUN
Supply to the Panel is missing.
High Voltage to the Chiller is missing.
Check 1FU, 2FU, 4FU, 5FU 17FU, or
19FU.
Check 2T or 10T Transformer.
Line Fuse is blown. Check Fuses.
Chiller Control Board is defective. Replace Chiller Control Board.
Display Board defective. Replace Display Board.
LINE FUSE BLOWS
SCR Diode Module is defective. Check SCR/Diode Module.
IBGT Module is defective. Check IBGT Module.
VSD Logic Board is defective. Replace VSD Logic Board.
SCR Trigger Board is defective. Replace SCR Trigger Board.
CHILLER FAULT:
LOW AMBIENT TEMPERATURE
Ambient temperature is lower than
the programmed operating limit.
Check the programmed cutout and
determine if it is programmed correctly.
Ambient Sensor is defective.
Check the panel against the thermometer
reading of ambient temperature.
CHILLER FAULT:
HIGH AMBIENT TEMPERATURE
Ambient Temperature is above the
maximum operating limit.
Check outside air temperature.
Ambient Sensor is defective.
Check the Panel Display against
Thermometer reading of Ambient
Temperature at the sensor.
CHILLER FAULT:
LOW LEAVING CHILLED LIQUID
Leaving chilled liquid temperature drops
faster than the unit can unload.
Check for restricted ow.
Check for rapid ow changes.
Water loop is too small.
Flow is below minimum for chiller.
Chilled Water Sensor is defective.
Check Sensor against Temp. Gauge in
water line.
Check Sensor for intermittent operation.
Check Wiring for shorts or opens.
SYSTEM FAULT:
CONTROL VOLTAGE
System Fuse is blown.
Check respective system Fuse 20FU
or 21FU.
SYSTEM FAULT:
HIGH OIL TEMPERATURE
Oil Temperature Sensor is defective.
Check Sensor with infrared to determine if
reading is reasonable.
Condenser Fans NOT operating or
running backwards.
Check Fans.
Coils dirty. Check and clean Coils.
NOTE: Always remove power to the chiller and assure the DC Bus voltage has bled off.

Quantech QTC4 STYLE A Series Specifications

General

Brand	Quantech
Model	QTC4 STYLE A Series
Category	Chiller
Language	English