109
The black square (
■
) indicates a switch position.
1
ON OFF
2
3
4
5
6
7
8
1
ON OFF
2
3
4
<Initial settings>
Switch
Step
Function
Operation in Each Switch Setting
Remarks
Purpose
Additional Information
ON
OFF
When to Set
SW5 function switch
6
Switching the target sub cool (Heating mode)
Enable
Normal
Can be set when OFF or during operation
To decrease the target sub cool value.
To reduce the discharge temperature decrease due to refrigerant liquid accumulation in the units.
A refrigerant flow noise might be generated if the sub
cool value is too small.
7
During the outdoor unit is in HEA
T
operation, additionally increase about 50 to 70 pulses of the LEV opening on the indoor unit which is in F
AN, ST
OP
, COOL
or thermo-OFF*
4
.
Active
Inactive
To additionally increase about 50 to 70 pulses of the LEV opening for units other than in HEA
T operation.
To avoid
a refrigerant shortage (less capacity) due to refrigerant
liquid accumulation in the units which is not in operation.
A
refrigerant
flow
noise
might
be
gene
rated
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, ST
OP
, or thermo-OFF
.*
5
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 HEA
T 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 HEA
T 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
performance insufficient.
8
Switching (2) the target evaporation temperature (ETm)
Enable
Normal
SW7 function switch
1
Ignore current sensor abnormality and rotational frequency abnormality of outdoor fan motor
Enable
Normal
After turning the power ON
*
8
<Initial settings>
To perform a test run for electrical parts alone without running the compressor
. Also, to perform the
troubleshooting of electrical parts without operating the outdoor unit’
s fan.
Make sure to connect the connector
s to the compr
essor
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
*
6
Include when the heating operation is OFF
.
*
7
Can be set when OFF or during operation
It
re
du
ces sn
ow
o
n
the
ba
se
, even
it
blo
ws in
sid
e
the
unit, by setting the base heater ON while the HEA
T
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
.
The performance might be insufficient.
5
—
—
—
—
—
6
Manual defrost
Manual defrost
Normal
During compressor running in HEA
T
mode.
Turn ON when it is necessary to perform the defrosting operation forcedly
.
(
Ef
fective only at start-up, or 10
minutes after the last defrosting operation)
It performs the defrosting operation forcedly
.
(HEA
T operation is stopped temporarily
.)
SW9 Function Switch
1
Auto change over from remote controller
(IC with the minimum address)
Enable*
3
Disable
Before turning the
power ON
<Initial settings>
Enables the indoor unit with the minimum address
to select
AUT
O 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-
6. OU
TD
OOR
U
NIT
IN
PU
T/OU
TP
UT
C
ON
NE
CT
OR
".
3
—
—
—
—
—
—
4
—
—
—
—
—
—
*
3
When a PWFY
series is connected, this function is always disable regardless of the switch.
*
4
SW5-7 Opens the indoor-
electronic
expansion valve as a countermeasure against the indoor unit in F
AN, COOL, ST
OP
, or thermo-OFF operation with refrigerant-shortage status due to an accumulation of liquid refrigerant in the indoor unit.
*
5
SW5-8 Countermeasure against room temperature rise for indoor unit in F
AN, COOL, and thermo-OFF (heating) mode.
*
6
During heating operation and the ambient temperature is 4
:
(39°F) or below
, the freeze prevention heater is energized.
*
7
During heating mode is OFF (include thermo-OFF in cooling mode), and the ambient temperature is 4
:
(39°F) or below
, the freeze prevention heater is energized.
*
8
Make sure to wait for 5 minutes after turning the breaker ON.
1
ON OFF
2
3
4
5
6
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
OCH632A
