Daewoo FR-650NT Series, Service Manual

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7-4. Function of Low Ambient Temperature (RT)
INPUT CONTROL OBJECT
●
RT
●
R-HTR
●
COMP
A. Condition of LOW RT
ⓐ
LOW RT Period : RT sensor ≤ 19
°
C
ⓑ
When the temperature of RT sensor is over 20
°
C, the system comes to be “General Operation Mode”.
ⓒ When the temp of RT sensor is between 19 ° C to 20 ° C the system keeps the previous mode ⓒ When the temp. of RT sensor is between 19 C to 20 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 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 D-HTR is on, R-HTR is on.
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 ≥ 20
°
C): The COMP can’t be on within 6 min.
B. Operation of LOW RT (Temp. at the RT sensor ≤ 19 ° C):
The COMP can’t be on within 30 min 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.)
7-6. Buzzer Sound
INPUT CONTROL OBJECT
●
Control Buttons
●
Door Switch
●
Initial Power Input
●
Buzzer
p
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.
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