FUNCTIONS
R-HTR
COMP
A. Condition of LOW RT
- LOW RT Period : RT sensor below 19C
- When the temperature of RT sensor is over 20C, the system comes to be “General Operation Mode”.
- When the temp. of RT sensor is between 19°C to 20C, the system keeps the previous mode.
B. Control
- When Comp. is on, R-HTR is off.
- When it passes 6 min after COMP is off, R- HTR is on.
- COMP can’t be on within 30 min after COMP is off.
; COMP doesn’t work at the steps “Heater On” and “Pause” of “Defrost Mode”.
If COMP comes to be off for “Low Room Temp” in the steps, it seems to take over 30 minutes.
- Change of “Prevention Time of COMP Restart” :
If satisfy the following conditions simultaneously, the time changes 6 minutes.
;
Accumulated running time of COMP passes 20 seconds after COMP is off.
;
R-Sensor is more than ‘ON’ Point TEMP.
- When it is not the mode of LOW ROOM TEMP
or RT-Sensor is on ERROR (open or short), R-Sensor HTR is off.
- Function of R-Heater Inspection:
After initial power is on, R-HTR is on/off 5times for 10 seconds.
- When Defrost Heater is on, R-Sensor Heater is on
CONTROL OBJECT
INPUT
RT
4. Function of Low Ambient Temperature (RT)
COMP
COMP. doesn’t work after COMP turns off even though R-sensor is on condition. (This is to protect comp.)
A. General operation (Temp. at the RT sensor is over 20C): The COMP can’t be on within 6 min.
B. Operation of LOW RT (Temp. at the RT sensor is below 19C):
The COMP can’t be on within 30 min.
(But the COMP can be on after 6min when the doors open more than 20 seconds.)
CONTROL OBJECT
INPUT
5. Prevention of Compressor Restart
Buzzer
A. Whenever “PCB Control Panel” button’s pushed, the buzzer rings.
B. After 2 minutes power’s on, the buzzer rings 3 times.
C. Time of Buzzer: Forced Defrost Mode (3 times), Short Circuit Test (1 time)
D. When door opens, the buzzer rings every 1 minute for 5 minutes.
CONTROL OBJECT
INPUT
Control Buttons / Door Switch
Initial Power Input
6. Buzzer Sound
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