Function Of Icemaker; Initial Control Function; Water Supply Control Function; Icemaking Control Function - LG LSC26905TT Service Manual

ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR

2. Function of Icemaker

2-1. Initial Control Function

1. When power is initially applied or reapplied after power cut, it detects level of icemaker cube mold after completion of
MICOM initialization. The detecting lever moves up and down.
2. The level of ice maker cube mold is judged by output signal, high and low signal, of Hall IC. Make the cube mold to be
horizontal by rotating ice ejection motor in normal or reverse direction so that High/Low signal can be applied to MICOM
Pin No. 42.
3. If there is no change in signal one minute after the geared motor starts to operate, it stops icemaker operation and check
the signal every hour. It resets initialization of icemaker when it becomes normal.
4. It judges that the initial control is completed when it judges the icemaker cube mold is horizontal.
5. Ice ejection conducts for 1 cycle regardless of ice in the ice bin when power is initially applied.

2-2. Water Supply Control Function

1. This is to supply water into the ice maker cube mold by operating water valve in the mechanical area when ice ejection
control is completed and ice maker mould is even.
2. The quantity of water supplied is determined by DIP switch and time.
Water Supply Quantity Table
GR-L267BV(T)R (Refer to appendix)
DIP SWITCH SETTING
No
S1 S2
1 OFF OFF
2 ON OFF
3 OFF ON
4 ON ON
5
6
7
8
3. If the water supply quantity setting is changed while the power is on, the change will take effect immediately. If it is
changed while the icemaker is filling the mold, the new setting will take effect the next time the, icemaker cycles.
4. When water supply signal is applied to water and ice valves at the same time during water supply, water shall be supplied
to water valve. If water supply signal is applied to ice valve during water supply, water shall be supplied to both water and
ice valves.

2-3. Icemaking Control Function

1. Icemaking control is carried out from the completion of water supply to the completion of ice making in the cube mold.
Icemaking sensor detects the temperature of cube mold and completes ice making. (ice making sensor is fixed below
icemaker cube mold)
2. Icemaking control starts after completion of water supply control or initial control.
3. The icemaker determined it's cycle is completed when the Icemaking sensor reaches -8 °C (17.6°F) after 100 minutes
have passes since water filled the mold.
4. It is judged that icemaking is completed when ice maker sensor temperature reaches below -12 °C after 20 minutes in
condition 3.
GR-L267BV(T)RA, GR-L267BV(T,S)PA
(Refer to appendix)
DIP SWITCH SETTING
WATER
SUPPLY TIME
S1
6.5 SEC OFF OFF
5.5 SEC ON OFF
7.5 SEC OFF
8.5 SEC ON
OFF OFF
ON OFF
OFF
ON
- 88 -
WATER
SUPPLY TIME
S2 S3
OFF 6.5 SEC
OFF 5.5 SEC
ON OFF 6 SEC
ON OFF 7 SEC
ON 7.5 SEC
ON 8 SEC
ON ON 9 SEC
ON ON 10 SEC
REMARKS
* The quantity of water
supplied depends on DIP
switch setting conditions
and water pressure as it
is a direct tap water
connection type. (the
water supplied is
generally 80 cc to 120 cc)
* DIP switch is on the main
PWB.