OCH790 _88
Bit Function
Operation in each switch setting
Purpose
Additional information
ON
OFF
When to set
7
While the outdoor unit
is in HEAT operation,
additionally increase by
50 to 70 pulses of the
LEV opening on the
indoor unit which is in
FAN, STOP, COOL or
thermo-OFF.
*3
Activated Deactivated
Any time
To additionally increase by 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 accumu-
lation in the units which is not in operation.
A refrigerant flow noise might be generat-
ed in units other than the one in opera
-
tion.
8
While the outdoor unit
is in HEAT operation,
fully close the LEV on
the indoor unit which is
in FAN or COOL.
*4
Activated Deactivated
Any time
To reduce the room temperature increase
by setting the LEV opening lower for the
indoor units in FAN or COOL.
The refrigerant is more likely to collect in
the indoor units in FAN or COOL, which
can cause refrigerant shortage of units,
resulting in less capacity and increase in
discharge temperature.
*2.
Refer to “Outdoor unit input/output connector”.
*3.
SW5-7 Opens the indoor-linear 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.
*4. SW5-8 Countermeasure against room temperature rise for indoor unit in FAN and COOL mode.
■
SW6: Function switch
Initial setting
1
ON
OFF
2 3 4 5 6 7 8
The black square (■) indicates a switch position.
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 (°C [°F])
9 [48]
11 [52]
6 [43]
14 [57]
Bit Function
Operation in each switch setting
Purpose
Additional information
ON
OFF
When to set
1
-
-
-
-
-
-
2
-
-
-
-
-
-
3
-
-
-
-
-
-
4
Change of defrosting
control
Activated
(For high
humidity)
Deactivated
Any time
To shorten the defrosting prohibition time
in high humidity (or heavy snow) region, in
order to reduce malfunctions caused by
frost.
The performance of HEAT operation is
somewhat reduced since the defrosting
operation is frequently performed.
5
-
-
-
Any time
-
-
6
Switching the target
discharge pressure
(Pdm)
Activated Deactivated
Any time
To raise the performance by setting the
PDm higher during HEAT operation.
Power consumption increases due to a
higher frequency. (The performance
would not increase at the maximum
operating frequency.)
7
Switching (1) the target
evaporation tempera
-
ture (ETm)
Activated Deactivated
Any time
To raise/lower the temperature by chang-
ing the target ETm during COOL opera
-
tion.
Switch to lower the temperature:
raises the performance
Switch to raise the temperature: prevents
condensation
Switching it to lower the temperature, it
raises the power consumption, and
produces more condensation. Switching it
to raise the temperature, it makes the
performance insufficient.
8
Switching (2) the target
evaporation tempera
-
ture (ETm)
Activated Deactivated
Any time
■
SW7: Function switch
Initial setting
1
ON
OFF
2 3 4 5 6
The black square (■) indicates a switch position.
Bit Function
Operation in each switch setting
Purpose
Additional information
ON
OFF
When to set
1
Ignore current sensor
abnormality and
rotational frequency
abnormality of
outdoor fan motor
Activated Deactivated OFF to ON under
suspension after
the power is
turned on.*
5
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 connectors
to the compressor after checking the
electrical parts. Be careful not to get
electrical shock while working on
electrical parts.
2
Set the freeze stat
heater (optional part)
to be energized only
during heating.
Activated Deactivated
Any time
Power consumption is reduced by limiting
the energization of the freeze stat heater
to heating only.
When SW7-2 is OFF, the freeze stat
heater is energized even when the
compressor is stopped during cooling
to prevent fan from being damaged
due to snow blowing inside the outdoor
unit and freezing.
3
-
-
-
-
-
-
4
Maximum frequency
down at 1 hour after
COOL operation
Activated Deactivated
Any time
To reduce condensation on the indoor unit
by lowering the frequency
The performance might be insufficient.
5
-
-
-
-
-
-
6
Manual defrost
Activated Deactivated During compres
-
sor 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.)
*5. Make sure to wait for 5 minutes after turning the breaker ON.
