Mitsubishi Electric CITY MULTI PUMY-P112VKM6 Service Manual page 88

Bit Function
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
8 While the outdoor unit
is in HEAT operation,
fully close the LEV on
the indoor unit which is
in FAN or COOL.
*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
ON
OFF
1 2 3 4 5 6 7 8
The black square (■) indicates a switch position.
SW6-6
Target Pdm (kg/cm²)
SW6-7
SW6-8
Target ETm (°C [°F])
Bit Function
1 -
2 -
3 -
4 Change of defrosting
control
5 -
6 Switching the target
discharge pressure
(Pdm)
7 Switching (1) the target
evaporation tempera-
ture (ETm)
8 Switching (2) the target
evaporation tempera-
ture (ETm)
■ SW7: Function switch
Initial setting
ON
OFF
1 2 3 4 5 6
The black square (■) indicates a switch position.
Bit Function
1 Ignore current sensor
abnormality and
rotational frequency
abnormality of
outdoor fan motor
2 Set the freeze stat
heater (optional part)
to be energized only
during heating.
3 -
4 Maximum frequency
down at 1 hour after
COOL operation
5 -
6 Manual defrost
*5. Make sure to wait for 5 minutes after turning the breaker ON.
OCH790 _88
Operation in each switch setting
ON OFF When to set
Activated Deactivated Any time
Activated Deactivated Any time
*4
OFF ON
29.5 31.5
OFF ON OFF ON
OFF OFF ON ON
9 [48] 11 [52] 6 [43] 14 [57]
Operation in each switch setting
ON OFF When to set
- -
- -
- -
Activated Deactivated Any time
(For high
humidity)
- - Any time
Activated Deactivated Any time
Activated Deactivated Any time
Activated Deactivated Any time
Operation in each switch setting
ON OFF When to set
Activated Deactivated OFF to ON under
suspension after
the power is
turned on.*
Activated Deactivated Any time
- -
Activated Deactivated Any time
- -
Activated Deactivated During compres-
sor running in
HEAT mode.
Purpose
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.
To reduce the room temperature increase
by setting the LEV opening lower for the
indoor units in FAN or COOL.
Purpose
- -
- -
- -
To shorten the defrosting prohibition time
in high humidity (or heavy snow) region, in
order to reduce malfunctions caused by
frost.
-
To raise the performance by setting the
PDm higher during HEAT operation.
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
Purpose
To perform a test run for electrical parts
alone without running the compressor.
Also, to perform the troubleshooting of
electrical parts without operating the
5
outdoor unit's fan.
Power consumption is reduced by limiting
the energization of the freeze stat heater
to heating only.
- -
To reduce condensation on the indoor unit
by lowering the frequency
- -
Turn ON when it is necessary to perform
the defrosting operation forcedly. (Effective
only at startup, or 10 minutes after the last
defrosting operation)
Additional information
A refrigerant flow noise might be generat-
ed in units other than the one in opera-
tion.
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.
Additional information
-
-
-
The performance of HEAT operation is
somewhat reduced since the defrosting
operation is frequently performed.
-
Power consumption increases due to a
higher frequency. (The performance
would not increase at the maximum
operating frequency.)
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.
Additional information
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.
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.
-
The performance might be insufficient.
-
It performs the defrosting operation
forcedly. (HEAT operation is stopped
temporarily.)