OC194-33, Emergency operation | Mitsubishi Electronics PL18FK21

(1)Indoor coil temperature code

During the test run, the indoor coil temperature code from 1 to 15 is displayed on the remote controller instead of room temperature. The code should fall with the lapse of time in normal COOL operation, and should rise in normal HEAT operation.

Code	1	2	3	4	5	6	7	8

Indoor coil temperature	-40~34°F	~50°F	~59°F	~68°F	~77°F	~86°F	~95°F	~104°F

Code	9	10	11	12	13	14	15

Indoor coil temperature	~113°F	~122°F	~131°F	~140°F	~158°F	~194°F	Thermistor abnormality

(2)Trouble during test run

●If the unit malfunctions during the test run, refer to section 10 in this manual entitled “TROUBLESHOOTING.”

●When the optional program timer is connected to the conditioner, refer to its operating instructions.

2-8 Emergency operation

When the remote controller or microprocessor malfunctions but all other parts are normal, emergency operation is started by setting the dip switch SW3 on the indoor controller board.

<Before emergency operation>

1.Make sure the compressor and the indoor fan are operating normally.

2.Locate the defect with the self-diagnostic function. When the self-diagnostic function indicates “protective function is working”, release the protective function before starting the emergency operation.

CAUTION: When the self-diagnostic function indicates a check code of “P5” (drain pump malfunction), DO NOT start the emergency operation because the drain may overflow.

<How to operate>

1. For emergency heating, turn the SW3 levers 2, 3, and 4 ON; and 1 OFF.

SW3 setting

emergency normal

heatingoperation

2 .3 .4 ON

1 - 4 OFF

microprocessor board

2.Turn ON the outdoor unit breaker and then ON the indoor unit breaker. Emergency operation will now start.

3.During emergency operation, the indoor fan operates on high speed, the auto vanes do not operate.

4.To stop emergency operation, turn OFF the indoor unit breaker.

5.Movements of the vanes do not work in emergency operation, therefore you have to slowly set them manually to the appropriate position.

NOTE: The remote controller POWER ON/OFF button can not start/stop emergency operations.

CAUTION: Do not use emergency cooling for more than 10 hours, as the indoor coil may freeze.

OC194-33

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