3-17
Section 3 - Service and Repair
CO2175F/2175RF/CO2175DWR
GENERAL
U-Line Frost Free Refrigeration System
Cooling Mode:
• Bypass solenoid valve closed
• Evaporator fan operating
• Refrigerant flows through capillary tube
• Normal vapor/compression cycle refrigeration
• Drain heater off (CO2175F/2175RF only)
Defrost Mode:
• Bypass solenoid valve open
• Refrigerant flows through bypass system
• Vapor flows from condenser to evaporator without a phase
change
• Drain heater on (CO2175F/2175RF only)
Figure 11. 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
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