Advanced Troubleshooting - Wine Guardian Sentinel Series Installation, Operation And Maintenance Manual

Advanced Troubleshooting

This section is intended for qualified refrigeration service technicians only.
The technician should repeat all the previous troubleshooting steps before taking action on these more
Evaporator coil is freezing
Possible Cause:
Charge too low
Static Pressure too high
High pressure switch keeps tripping
Even After Checking for Obstructions and Dirty Filters/Coils
Possible Cause:
Condenser fan not operating
Defective Switch
Unit cycles on and off more than 8 times/hr
Possible Cause:
Thermostat malfunctioning
Low suction pressure
High pitched or loud rubbing noise, clanking, or vibration
Possible Solution:
Fans loose or malfunctioning
Excessive compressor vibration
Replacing the blowers
Note: When replacing the fan or motor, replace the fan and motor as a unit. Do not
remove the motor from the impeller wheel.
70
IMPORTANT
technical solutions.
Solution:
Check sight glass
Check for leaks
Add refrigerant
Run a static pressure calculation to see if
there is too much ductwork, update the
duct run accordingly.
Solution:
Repair or replace
Replace
Solution:
Check the thermostat guide for thermostat
information
Check low pressure switch
Check pressure and adjust superheat
Solution:
Repair or replace
Replace