126
Switch
Step
Function
Operation in Each Switch Setting
Remarks Purpose Additional Information
ON OFF When to Set
SW5
function
switch 7
During the outdoor unit is in HEAT
operation, additionally increase about 50
to 70 pulses of the LEV opening on the
indoor unit which is in FAN, STOP, COOL,
or thermo-OFF.
*
1
Active Inactive
Can be set when
OFF or during
operation
To additionally increase about 50 to 70 pulses of the LEV
opening for units other than in HEAT operation. To avoid
a refrigerant shortage (less capacity) due to refrigerant
liquid accumulation in the units which is not in operation.
A refrigerant ow noise might be generated
in units other than the one in operation.
8
During the outdoor unit is in operation,
fully closes the electronic expansion
valve on the indoor unit which is in
FAN, COOL, STOP, or thermo-OFF.*
2
Enable Normal
Before turning the
power ON.
To reduce the room temperature increase by setting
the LEV opening lower for the units in thermo-OFF
operation.
The refrigerant is more likely to collect in the units with
thermo-OFF operation, and causing the units refrigerant
shortage. (Results in less capacity and increase of
discharge temperature.)
SW6
function
switch
1 — — — —
<Initial settings>
— —
2 — — — —
— —
3 — — — —
— —
4 Change of defrosting control
Enable
(For high
humidity)
Normal
Can be set
when OFF
or during
operation
To shorten the defrosting prohibition time in high
humidity (or heavy snow) region, in order to reduce
malfunctions caused by frost .
The performance of the HEAT operation is somewhat
reduced since the defrosting operation is frequently
performed.
5 — — —
— —
6
Switching the target discharge
pressure (Pdm)
Enable Normal
To raise the performance by setting the PDm higher
during HEAT operation.
Power consumption is raised due to a higher
frequency.
(The performance would not be raise at the
maximum operating frequency.)
7
Switching (1) the target evaporation
temperature (ETm)
Enable Normal
To raise/reduce the performance by changing the
target ETm during COOL operation.
Switch to raise the performance: raises the performance
Switch to reduce the performance: prevents dew condensation
Switching it to raise the performance, it raises the power
consumption, and produces more dew condensation.
Switching it to reduce the performance, it makes the
performanceinsufcient.
8
Switching (2) the target evaporation
temperature (ETm)
Enable Normal
SW7
function
switch
1
Ignore current sensor
abnormality
Enable Normal
After turning
the power ON.
<Initial settings>
To perform a test run for electrical parts alone without
running the compressor.
Make sure to connect the connectors to the compressor
after checking the electrical parts. Be careful not to get
electrical shock while working on electrical parts.
2
Setting to energize the freeze
stat heater (optional part)
During
heating
operation
only
*
3
Include when
the heating
operation is
OFF.
*
4
Can be set when
OFF or during
operation
It reduces snow on the base, even it blows inside the
unit, by setting the base heater ON while the HEAT
operation is stopped.
Power consumption raises while the operation is
stopped.
3 — — — — — —
4
Maximum frequency down at 1
hour after COOL operation
Enable Normal
Can be set when
OFF or during
operation
To reduce dew condensation on the indoor unit by
lowering the frequency.
Theperformancemightbeinsufcient.
5 — — — — — —
6 Manual defrost
Manual
defrost
Normal
During compressor
running in HEAT
mode.
Turn ON when it is necessary to perform the defrosting
operation forcedly.
(
Effective only at startup, or 10
minutes after the last defrosting operation)
It performs the defrosting operation forcedly.
(HEAT operation is stopped temporarily.)
SW9
Function
Switch
1
Auto change over from remote
controller (IC with the minimum address)
Enable Disable
Before turning the
power ON
<Initial settings>
Enables the indoor unit with the minimum address
to select AUTO mode, and switches the operation
mode of the other indoor units to the same mode.
Cannot be set when the centralized control
is ON.
2
Switching the Silent/ Demand
mode
Demand
control
Silent
mode
Can be set when
OFF or during
operation
—
About the Silent mode/Demand control setting, refer to
"8-5. OUTDOOR UNIT INPUT/OUTPUT CONNECTOR".
3
— — — —
— —
4
— — — —
— —
*
1
SW5-7 Opens the indoor-
electronic
expansion valve as a countermeasure against the indoor unit in FAN, COOL, STOP, or thermo-OFF operation with refrigerant-shortage status due to an accumulation of liquid refrigerant in the indoor unit.
*
2
SW5-8 Countermeasure against room temperature rise for indoor unit in FAN, COOL, and thermo-OFF (heating) mode.
*
3
During heating operation and the ambient temperature is 39°F [4
:
] or below, the freeze prevention heater is energized.
*
4
During heating mode is OFF (include thermo-OFF in cooling mode), and the ambient temperature is 39°F [4
:
] or below, the freeze prevention heater is energized.
SW6-6 OFF ON
Target Pdm (kg/cm²)
29.5 31.5
SW6-7 OFF ON OFF ON
SW6-8 OFF OFF ON ON
Target ETm (:) 9 11 6 14
1
ON
OFF
2 3 4 5 6 7 8
<Initial settings>
1
ON
OFF
2 3 4 5 6
1
ON
MXZ-8C48/60NA
MXZ-4C36/5C42/
8C48NAHZ
OFF
2 3 4 5 6
1
ON
OFF
2 3 4 5 6
1
ON
OFF
2 3 4
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