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5.2. FC Defrost Control
FC defrost control is performed with the internals of a definite period of time.
1. When Power Supply Is Turned On.
When power supply is turned on and 4 hours passes, FC defrost control begins.
If when the power supply is turned on, FCC temperature 25°C or above and add the condition, ATC correction
temperature 25°C or above, and 12 hours later FC defrost control begins.
2. Normal operation
• ATC correction temperature 19°C or above.
13 hours later when the FC defrost control had done, it begins again.
• ATC correction temperature 18°C or below.
28 hours later when the FC defrost control had done, it begins again.
3. End
• FC defrost control ends when the DEF temperature 10°C or above from the last time operation had done.
5.3. PC Defrost Control
1. FC and PC Defrost simultaneous control.
• PC defrost control begins the same time till FC defrost control begins.
• PC defrost heater never turns off till FC defrost control ends.
2. PC defrost control (not FC defrost control is performed)
• About 5.5 hours had passed after FC defrost control ends, PC defrost heater turns on the case, FC cooling mode or
compressor off mode.
• The DFP reaches 2°C or above, PC defrost heater turns off. However PC defrost heater turns on at least 10 minutes.
• PC defrost single control is not perform, before FC defrost control begins.
5.4. 3-Way Valve Control
Cooling Mode Change is controlled by detected temperature of PEC, FCC, PCC, SCC.
5.4.1. When Power Is Turned On
After power supplied and about 5 seconds passed, PC side opens 1 second, and FC side opens 1 second, and change to
the PC cooling mode for 10 minutes.
5.4.2. Basic Control
Basically 3-way valve operation of each mode as shown under the below.
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