LG Electronics GR-P257/L257 Control of M/C room fan motor, Door opening alarm, Doors of freezing

MICOM FUNCTION

2-10. Control of M/C room fan motor

1.The M/C room fan motor performs ON/OFF control by linking with the COMP.

2.It controls at the single RPM without varying RPM.

3.Failure sensing method is same as in fan motor of freezing fan motor (refer to failure diagnosis function table for failure display).

2-11. Door opening alarm

1.Buzzer generates alarm sound if doors are not closed even when more than a minute consecutively has passed with doors of freezing / cold storage room or home bar opened.

2.Buzzer rings three times in the interval of 0.5 second after the first one-minute has passed after doors are opened and then repeats three times of On/Off alarm in the cycle of every 30 seconds.

3.If all the doors of freezing / cold storage room or home bar are closed during door open alarm, alarm is immediately released.

Doors of freezing /
cold storage room Closing Opening Closing	Opening					Closing
or home bar
		3 Times 3 Times 3 Times			3 Times
BUZZER
Within	A minute	30		30	30
a minute			seconds seconds seconds

2-12. Ringing of button selection buzzer

1. If pressing the front display button, “Ding ~ “ sound rings.

2-13. Ringing of compulsory operation, compulsory frost removal buzzer

1.If pressing the test button in the main PCB, “Phi ~ “ sound rings.

2.In selecting compulsory operation, alarm sound is repeated and completed in the cycle of On for 0.2 second and Off for

1.8second three times.

3.In selecting compulsory frost removal, alarm sound is repeated and completed in the cycle of On for 0.2 second , Off for

0.2second, On for 0.2 second and Off for 1.4 second three times.

2-14. 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).

- 21 -