Frost Removal Function; Sequential Operation Of Built-In Product - LG GR-B207WVQ.CSWQAGE Service Manual

MICOM FUNCTION

2-7. Frost removal function

1. Frost removal is performed whenever total operation time of compressor becomes 7 ~ 7.5 hour.
2. In providing initial power (or returning power failure), frost removal starts whenever total operation time of compressor
becomes 4 ~ 4.5 hour.
3. Frost removal is completed if temperature of a frost removal sensor becomes more than 5°C after starting frost removal.
Poor frost removal is not displaced if it does not arrive at 5°C even if two hours have passed after starting frost removal.
4. No removal is done if frost removal sensor becomes poor (snapping or short-circuit).

2-8. Sequential operation of built-in product

Built-in products such as compressor, frost removal heater, freezing room fan, Cooling Fan and step motor damper are
sequentially operated as follows for preventing noise and part damage occurred due to simultaneous operation of a lot of
parts in applying initial power and completing test.
Function
When temperature
of a frost removal
sensor becomes
POWER
more than 45°C
(In purchase,
movement)
When
temperature of a
frost removal POWER
sensor becomes
less than 45°C
(In power failure,
service)
sec.
Test mode 1
(Compulsory
(Press
function)
Once)
Test mode 1
(Compulsory
(Press
function)
2 times)
Test mode 2
(Compulsory frost
(Press
removal)
3 times)
Load Operation Sequence
0.5 0.3
COMP
sec. sec.
ON ON
0.5 8
FROST
sec. sec.
REMOVAL
HEATER
ON
ON
5.6 27
COMP
sec.
ON
0.3
TEST
OTHER
sec.
S/W
LOAD
OFF
0.3
TEST
sec.
COMP
S/W
OFF
TEST
0.3
F-FAN
sec.
S/W
&
C-FAN
OFF
0.3 0.3
STEP
F-FAN
sec. sec.
MOTOR
&
C-FAN
DAMPER
ON
ON
HOME
0.3
FROST
BAR/
sec. sec.
REMOVAL
PIPE
HEATER
HEATER
OFF
ON
0.3
F-FAN
sec.
&
C-FAN
ON
0.3 0.3
F-FAN
COMP
sec. sec.
&
C-FAN
ON
ON
0.3 0.3
F-FAN
F-FAN
sec. sec.
&
&
C-FAN
C-FAN
ON
OFF
0.3 FROST 0.3
sec. sec.
REMOVAL
HEATER
ON
- 10-
Remark
If error occurs
during operation,
HOME
initial operation is
BAR
not done.
HEATER
ON
HOME
5
BAR/
PIPE
HEATER
OFF
STEP
MOTOR
DAMPER
ON
STEP
If pressing switch
MOTOR
once more in the
DAMPER
test mode 2 or
OPEN
temperature of a
frost removal
sensor is more
than 5°C, it
STEP immediately
MOTOR
returns to the test
DAMPER
mode for initial
OPEN
operation
(COMP operates
after 7 minutes).
STEP
MOTOR
DAMPER
CLOSE