101
OCH668G
The black square (
■
) indicates a switch position.
1
ON OFF
2
3
4
5
6
7
8
Switch
Step
Function
Operation in Each Switch Setting
Remarks
Purpose
Additional Information
ON
OFF
When to Set
SW5 Function
Switch
1
Demand control setting for
Australia
Australia setting
Normal*
1
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.
The refrigerant flow noise at startup 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
and provide efficient defrosting operation.
The refrigerant flow noise during the defrosting
operation become 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.
A refrigerant flow noise might be generated if the sub
cool value is too small.
7
While 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 FAN, ST
OP
, COOL
or thermo-OFF*
2
.
Active
Inactive
To
additionally
increase
about
50
to
70
pulses
of
the
LEV
openi
ng for uni
ts other than
in HEA
T operatio
n.
To av
oid a
refrigerant shortage (less capacity) due to refrigerant liquid
accumulation in the units which is not in operation.
A
refrigerant
flow
noise
might
be
generated
in
units other than the one in operation.
8
While the outdoor unit is in HEA
T
operation, fully close the Linear expansion valve on the indoor unit which is in F
AN or COOL.*
3
Enable
Normal
To reduce the room temperature increase by setting the LEV opening lower for the indoor units in F
AN or COOL.
The refrigerant is more likely to collect in the indoor units in F
AN or COOL, which can cause refrigerant shortage of
units. (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
External static pressure mode
Enable
Normal
To raise the fan rotation to raise the performance when an external static pressure is applied.
It can support the external static pressure up to 30 Pa.
The power input and the sound level become larger due
to increasing the outdoor unit’
s fan rotation.
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
1
ON OFF
2
3
4
5
6
7
8
SW6-6
OFF
ON
Target Pdm (kg/cm²)
29.5
31.5
SW6-7
OFF
OFF
ON
ON
SW6-8
OFF
ON
OFF
ON
Target ETm (
:
)
9
11
6
5
Note:
The target ETm varies according to
an intake temperature.
Continue to the next page.
*
1
Refer to "8-4. OUTDOOR UNIT
INPUT/OUTPUT
CONNECT
OR".
*
2
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.
*
3
SW5-8 Countermeasure against room temperature rise for indoor u
nit in F
AN and COOL
mode.
*
4
During heating operation and the ambient temperature is 4
°C
(39°F) or below
, the freeze prevention heater is energized.
*
5
During heating mode is OFF (include thermo-OFF in cooling mode), and the ambient temperature is 4
°C
(39°F) or below
, the freeze prevention heater is energized.
