125
8-9. INTERNAL SWITCH FUNCTION TABLE
(1) Function of switches
MXZ-4C36NAHZ(-U1) MXZ-5C42NAHZ(-U1) MXZ-8C48NAHZ(-U1) MXZ-8C48NA(-U1)
MXZ-8C60NA-U1
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Switch
Step
Function
Operation in Each Switch Setting
Remarks Purpose Additional Information
ON OFF When to Set
SWU1
ones digit
SWU2
tens digit
Rotary switch
Before turning
the power ON
<Initial settings>
SW1
Digital
Display
Switch
1–8
Can be set either during
operation or not.
<Initial settings>
SW2
Function
Switch
1 Selects operating system startup
With centralized
controller
Without centralized
controller
Before turning
the power ON
<Initial settings>
Turn ON when the centralized controller is
connected to the outdoor unit.
•SW2-1 must be turned ON if a central
controller is connected to the system. An
example of this would be a TC-24, EW-50A,
AG150, AE50 or AE200. If SW2-1 is not turned
on, while using a central controller, in rare
circumstances problems may be encountered
such as indoor units not responding to group
commands. Therefore, turning SW2-1 ON is
recommended if a central controller is used.
•Group setting of 2 or more A-IC units which
is connected to branch box via centrilized
controller is not allowed.
2
Connection Information Clear Switch
Clear Do not clear
When relocating units or connecting additional
units.
—
3 Abnormal data clear switch input
Clear
abnormal data
Normal
OFF to ON any time after
the power is turned on.
To delete an error history.
4 Pump down
Run
adjustment
mode
Normal
During compressor
running
To facilitate outdoor unit the pumping down
operation.
Frequency = Fixed to 65 Hz
I
ndoor-electronic expansion valve = Fully open
Outdoor fan step = Fixed to 10
Please refer to a section referring to
the pumping down on outdoor units
Installation Manuals. It might not be
possible to collect all the refrigerant
if the amount is excessive.
5 — — — — — —
6 — — — — — —
SW2-5, 6/
SW4/
SW8
Model
Switch
1–6
MODEL SELECTION 1:ON 0:OFF
Before the power
is turned ON.
<Initial settings>
Set for each capacity.
— —
SW3 Trial
operation
1 ON/OFF from outdoor unit ON OFF
Any time after the
power is turned ON.
<Initial settings>
— —
2 Mode setting Heating Cooling — —
SW5
Function
switch
1 Demand control setting for Australia
Australia setting
Normal
Can be set when
off or during
operation
<Initial settings>
Turn ON to activate the demand control for
Australia.
(Do not turn this ON if the unit is in
outside Australia)
2
Change the indoor unit's LEV
opening at startup
Enable Normal
To set the LEV opening at startup higher than usua
l
(+150 pulses). To improve the operation with
the LEV almost clogged.
Therefrigerantownoiseatstartup
become louder.
3 — — — — — —
4 — — — — — —
5
Change the indoor unit's LEV
opening at defrost
Enable Normal
Can be set when
OFF or during
operation
To set the LEV opening higher than usual
during defrosting operation.
(Only Qj
[
10 is valid, + 300 pulses)
To avoid the discharge temperature increase
andprovideefcientdefrostingoperation.
Therefrigerantownoiseduring
the defrosting operation becomes
louder.
6
Switching the target sub cool
(Heating mode)
Enable Normal
To decrease the target sub cool value.
To reduce the discharge temperature
decrease due to refrigerant liquid
accumulation in the units.
Arefrigerantownoisemightbe
generated if the sub cool value is
too small.
The black square (■) indicates a switch position.
1
ON
OFF
2 3 4 5 6 7 8
SWU2
(tens digit)
0
1
2
3
4
5
6
7
8
9
SWU1
(ones digit)
0
1
2
3
4
5
6
7
8
9
1
ON
OFF
2 3 4 5 6
SWU2
(tens digit)
0
1
2
3
4
5
6
7
8
9
SWU1
(ones digit)
0
1
2
3
4
5
6
7
8
9
SW2
5
ON
OFF
6
5
ON
OFF
6
1
ON
OFF
2
1
ON
OFF
2
SW4
MODELS
MXZ-4C36NAHZ
SW8
MXZ-5C42NAHZ
1
ON
OFF
2 3 4 5 6
ON
OFF
1 2 3 4 5 6
SW2
5
ON
OFF
6
5
ON
OFF
6
1 2
ON
OFF
ON
OFF
SW4
MODELS SW8
MXZ-8C48NA
ON
OFF
1 2 3 4 5 6
1
ON
OFF
2 3 4 5 6
5
ON
OFF
6
1
ON
OFF
2
MXZ-8C48NAHZ
1
ON
OFF
2 3 4 5 6
MXZ-8C60NA
1 2
1
ON
OFF
2
1
ON
OFF
2 3 4 5 6 7 8
1
ON
OFF
2 3 4 5 6
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