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No.
Item
2
Control by the
number of operating
indoor unit
3
Selection of
operation mode
4
Outdoor fan control
34
The compressor operational frequency and the LEV opening are controlled depending on the
number of operating indoor units.
(1)Compressor operational frequency
• The variable range of compressor operational frequency changes according to the operation
signal (capacity code and temperature difference) given from the operating indoor unit (s).
When the number of operating indoor units is reduced during heating operation, the operational
frequency will decrease by 20 Hz in one minute. After that, the operational frequency will return
to the variable status.
(2) LEV opening
• The LEV opening varies according to the operation signal given from the operating indoor unit
(s).
When the number of operating indoor units is reduced during heating operation, the LEV
opening will be fixed to the current valve for one minute. After that, the LEV opening will return
to the variable status.
1 When a single indoor unit is operating, the system operates in the mode as selected by that
indoor unit.
2. When two indoor units are operating in the same mode, the system operates in that mode.
3. Simultaneous COOL and HEAR operation is unavailable within a system. The indoor unit
activated earlier has the priority to decide the operation mode of the system. The other unit
enters the standby status when it receives the order to operate in a different mode. To operate
these units in the same mode from such a status, reset both units to the same operation mode,
turned them off, and then turn them back on.
4. Simultaneous COOL and DRY operation is available within a system. In this case, the outdoor
unit operates in the COOL mode. (The outdoor unit operates in the DRY mode only when all the
indoor units are operating in the DRY mode.)
The outdoor fan turns ON according to "Compressor ON" commands given from each indoor unit.
MXZ-18NV- E1
Number of
One
operating
unit
indoor unit
Cooling
Hi
Heating
Low
MXZ-32NV- E1 E2
Number 05
One
operating
Total
indoor
unit
unit
capacity code
1
2
Low
3
4
5
6
7
8
9
10
a) Compressor shell overheat protection
When a single unit is operating in a system with the LEV fully open and the discharge
temperature at 95; or above, the outdoor fan speed changes to High. It is released when the
number of operating indoor units has changed, the operation mode has changed, or the power
has turned OFF.
b) Inverter overheat protection
When the fin temperature thermistor detects 88; or above, the indoor fan speed changed to
High. It is released when the compressor has turned OFF.
c) After defrosting during heating operation, the outdoor fan speed shifts to the next higher level.
(
)
I. e. Low to Me
Me to High
Details
MXZ-18NV- E2
One
Two
Two
unit
unit
unit
Hi
Hi
Hi
Hi
Hi
Hi
Two
Three
Four
unit
unit
unit
Low
Me
Me
Me
Indoor unit
Capacity code
capacity class
07/09
12(13)
18
The outdoor fan is controlled at High
speed for the first 10 seconds after start-
up.
In addition, the outdoor fan speed
temporarily changes to High during the
compressor and inverter protection.
1
3
4
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