DONGBU DAEWOO ELECTRONICS FN-T650NTB SERIES, Service Manual

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7-4. Function of Low Ambient Temperature (RT)
INPUT CONTROL OBJECT
●
RT
●
R-HTR
●
COMP
● FAN
A. Condition of LOW RT
ⓐ
LOW RT ‘A’ Period : RT sensor ≤ 12
°
C
ⓑ
LOW RT ‘B’ Period : 12
°
C ≤ RT sensor ≤ 17
°
C
ⓒ
When the temperature of RT sensor is over 17
°
C, the system comes to be “General Operation Mode”.
ⓓ
When the temp. of RT sensor is between 16
°
C to 17
°
C, 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.
●
R-Sensor is more than ‘ON’ Point TEMP.
ⓔ
When RT mode is Low RT ‘A’ ,Fan Chopping On/Off : 1min / 2min
ⓕ
When RT mode is Low RT ‘B’ ,Fan Chopping On/Off : 5min / 3min
ⓖ
Function of R-Heater Inspection:
After initial power is on, R-HTR is on/off 5times for 10 seconds.
ⓗ
When D-HTR is on, R-HTR is on.
7-6. Buzzer Sound
INPUT CONTROL OBJECT
●
Control Buttons
●
Door Switch
●
Initial Power Input
●
Buzzer
A. Whenever “PCB Control Panel” button’s pushed, the buzzer rings.
B. After 2 seconds 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.
7-5. Prevention of Compressor Restart
INPUT CONTROL OBJECT
●
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 ≥ 17
°
C): The COMP can’t be on within 6 min.
B. Operation of LOW RT (Temp. at the RT sensor ≤ 17
°
C):
The COMP can’t be on within 30 min.
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