Mitsubishi Electronics MUY-ANA manual MXZ-2A, MXZ-3A, Outdoor heat exchanger Receiver Receiver LEV

The table below shows the role of Exclusive LEV and Receiver LEV in each operation mode.

	Circulation	Capacity	Discharge	High	wEvaporation
	Amount		Temperature	Pressure	Temperature
		Distribution
	Control		Protection	Protection	Protection
COOL	Exclusive LEV
	Receiver LEV
HEAT	Exclusive LEV
	Receiver LEV

Indoor heat	Exclusive
exchanger	LEV

(MXZ-3A)

Outdoor heat exchanger

Receiver

Receiver

LEV

wIn COOL mode, the two indoor coil thermistor (one main and one sub) sense temperature ununiformity (super heat) at the heat exchanger, and when temperature difference have developed, the indoor coil thermistors adjust LEV opening to dimin- ish the super heat.This action is called Evaporation Temperature Protection.

The opening pulse of the Receiver LEV is fixed to the standard No.3 in cooling operation, and so is that of each Exclusive LEV in heating operation.

However the opening pulse will be changed to the standard No.4 or No.5 when the discharge temperature protection or high- pressure protection is working.

In addition to that, it will also be changed to standard No.2 or No.1 when the opening pulse of the each Exclusive LEV becomes 100 pulse or less in cooling operation or so does that of Receiver LEV in heating operation.

<MXZ-2A>
Number of			LEV opening (pulse)
operating		COOL			HEAT
indoor units
Standard No.	1 unit		2 units	1 unit		2 units
1	200		150	120		120
2	300		320	140		140
3	400		360	160		160
4	450		410	220		220
5	500		500	280		280
<MXZ-3A>
Number of			LEV opening (pulse)
operating		COOL			HEAT
indoor units
Standard No.	1 unit	2 units	3 units	1 unit	2 units	3 units
1	150	250	250	250	250	250
2	250	320	320	300	300	300
3	350	360	370	450	380	380
4	400	410	420	460	400	390
5	450	460	470	470	450	440

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