USER GUIDE
FROST FREE REFRIGERATION
Cooling Mode
• Bypass solenoid closed.
• Evaporator fan operating.
• Refrigerant flows through capillary tubes.
• Normal vapor/compression cycle refrigeration.
Defrost Mode
• Bypass solenoid valve open.
• Refrigerant flows through bypass system.
• Vapor flows from condenser to evaporator without a
phase change.
Figure 1. Frost Free Refrigeration System.
SOLENOID VALVE
CAPILLARY TUBE
VALVE IS CLOSED
FLOW WHEN SOLENOID
DRYER
CONDENSER
COMPRESSOR
EVAPORATOR
VALVE IS OPEN
FLOW WHEN SOLENOID
ULIN_0369_A
Troubleshooting - Extended 1
45