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5.2.
FC Defrost Control
Cumulating the compressor running time of certain period
or time after defrosting according to room temperature and
ATC temperature, defrosting cycle starts.
Cumulating time for defrosting
4 hours Initially started
8 hours When room and ATC temp. is 25
or above
12 hours When room temp. is 19
28 hours When room temp. is 18
Maximum defrosting time is 60 minutes.
5.3.
3-Way Valve Control
Cooling Mode Change Control is controlled by detected
temperature of PEC, FCC, PCC, SCC.
5.3.1.
Operation condition of 3-Way Valve
1. In case PEC sensor temperature is 4°C or above
• PEC sensor temperature is Turning on temperature
(ON temperature) or above------------ PC cooling mode
• PEC sensor temperature is Turning off temperature
(OFF temperature) or below----------- FC cooling mode
2. In case PEC sensor temperature is less than 4°C
FC Cooling Mode is set.
However, PC Cooling Mode is set, until PCC sensor
temperature is become OFF temperature during PC
Cooling Mode.
3. During FC Cooling Mode
FCC sensor temperature is OFF temperature or below
------------------------- Compressor off mode
4. However, during FC Cooling Mode, though FCC sen-
sor temperature is OFF temper below, there is a case
not to become Compressor OFF Mode, according to
VC setting.
5. However, PC Cooling Mode is forcibly ended when
reaching at time PC Cooling Mode below. (Forcible
OFF Cycle Defrost)
When condition of PC Cooling Mode is satisfied as
above mentioned, it is shifted to PC Cooling Mode.
When power is turned on: Forcible OFF Cycle Defrost is
started from Defrost stopping.
Normal Time:
PC Cooling Mode is continuously for 10 hours.
PC Cooling Mode is reset at the same time with
Time Rest
5.3.2.
3-Way Valve Control when power is
turned on
It is FC Cooling Mode from power turning on to 15 minutes,
PC Cooling Mode from 15 minutes to 40 minutes, to be nor-
mal 3-Way Valve Control after 40 minutes.
Cumulating
°C
pressor
running
time
°C or above
Cumulating
after defrosting
°C or below
5.3.3.
Setting
Cycle pattern is changed by 3-Way
Valve position
Basically 3-Way Valve operation of each Mode as shown
below.
com-
Basic Mode
PC Cooling Mode
time
FC Cooling Mode
Compressor OFF Mode
FC Defrost Mode
During waiting after FC
Defrost
During Precool Control
5.3.4.
Initial Control of 3-Way Valve
When power is turned on, Initial Control of 3-Way Valve is
done.
Initial Control: 3-Way Valve is opened towards PC side
(Positive pulse 5 times), then 1 second after that, it is
opened toward FC side (Negative pulse 5 times).
5.3.5.
Evacuation Mode
When power is turned on, Initial Control of 3-Way Valve is
done.
Starting: The valve is opened toward PC side of 3-Way
Valve when "Freezer set button" is pressed on Self-Diag-
nosis Mode*.
And "P" "FU" characters are displayed on the control
panel.
• Self-Diagnosis Mode can be started when "Super Freeze
button" on the control panel is pressed more than 5 sec-
onds.
Ending: Press "Freezer set button" again, then Evacuation
Mode is ended and Self-Diagnosis Mode appear again.
During Evacuation Mode, to press "Super Freeze button"
the Mode is ended.
Or 7 minutes after starting the Self-Diagnosis Display Con-
trol, at the same time Self-Diagnosis Mode is ended too.
17
operation:
Refrigerant
3-Way Valve
Compressor
condition
PC side open
ON
FC side open
ON
PC side open
OFF
FC side open
OFF
FC side open
OFF
FC side open
ON
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