Mitsubishi Electric BDT CITY MULTI Installation And Pre-Commissioning Booklet page 57

PUMY-P-V(Y)KM-A(-BS)
Switch Step Function
When the outdoor unit is in HEAT
SW5 7
operation, slightly opens the electronic
function
expansion valve on the indoor unit which
switch
is in FAN, STOP, COOL or thermo-OFF**.
When the outdoor unit is in operation,
8
fully opens the electronic expansion
valve on the indoor unit which is in
FAN, COOL, STOP, or thermo-OFF.***
1 —
Switch of current limitation
2 reading
in a different way
3 —
4 Change of defrosting control
SW6
function
Ignore refrigerant
5
switch
abnormality
Switching the target discharge
6
pressure (Pdm)
Switching (1) the target evaporation
7
temperature (ETm)
Switching (2) the target evaporation
8
temperature (ETm)
Ignore current sensor
1
abnormality
Setting to energise the freeze
2
stat heater (optional part)
SW7
function
3 —
switch
Maximum frequency down at 1
4
hour after COOL operation
5 —
6 Forced defrost
Auto change over from remote
1
SW9
controller (IC with the minimum address)
Function
Switch Switching the Silent/ Demand
2
mode
When a PWFY series is connected, this function is always disable regardless of the switch.
*
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.
SW5-8 Countermeasure against room temperature rise for indoor unit in FAN, COOL, and thermo-OFF (heating) mode.
* * *
During heating operation and the ambient temperature is 4
* * * *
During heating mode is OFF (include thermo-OFF in cooling mode), and the ambient temperature is 4
* * * * *
Operation in Each Switch Setting
Remarks
ON OFF When to Set
Can be set when
<Initial settings>
Active Inactive OFF or during
ON
operation
OFF
1
Before turning the
Enable Normal
power ON.
— — —
<Initial settings>
Before turning
Enable Normal
the power ON.
ON
— — OFF
—
1
Enable
(For high Normal
humidity)
Enable Normal
Can be set
SW6-6
when OFF
or during
Target Pdm (kg/cm²) 29.5 31.5
Enable Normal
operation
Enable Normal
SW6-7 OFF
SW6-8 OFF OFF
Enable Normal
Target ETm (: ) 9
After turning
Enable Normal
the power ON. <Initial settings>
During Include when
ON
Can be set when
heating the heating
OFF
OFF or during
operation operation is
operation 1
only**** OFF.*****
— — —
Can be set when
Enable Normal OFF or during
operation
— —
During compressor
Forced
Normal running in HEAT
defrost
mode.
<Initial settings>
Before turning the
Enable* Disable
power ON
ON
Can be set when
OFF
Demand Silent
OFF or during
control mode
operation
(39°F) or below, the freeze prevention heater is energized.
:
Purpose
To open the LEV opening higher for units other than in
HEAT operation. To avoid a refrigerant shortage (less
capacity) due to refrigerant liquid accumulation in the
units which are not in operation.
2 3 4 5 6 7 8
To reduce the room temperature increase by setting
the LEV opening lower for the units in thermo-OFF
operation.
—
To lower the primary current limit by 3A.
This switch is used for a single phase model with a
—
2 3 4 5 6
To shorten the defrosting prohibition time in high
humidity (or heavy snow) regions, in order to reduce
malfunctions caused by frost .
To ignore the error detection of excessive charge of
refrigerant. The unit can be excessively charged with
refrigerant depending on the operating condition.
OFF ON
To raise the performance by setting the PDm higher
during HEAT operation.
To raise/reduce the performance by changing the
ON OFF ON
target ETm during COOL operation.
ON ON
Switch to raise the performance: raises the performance
11 6 14
Switch to reduce the performance: prevents dew condensation
To perform a test run for electrical parts alone without
running the compressor.
Energises electric heater element within drain tray
to reduce ice build up. Set the base heater to ON
2 3 4 5 6
while the HEAT operation is stopped.
—
To reduce dew condensation on the indoor unit by
lowering the frequency.
—
Turn ON when it is necessary to perform the defrosting
(
operation forcedly. Effective only at start-up, or 10
minutes after the last defrosting operation)
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.
—
1 2
(39°F) or below, the freeze prevention heater is energized.
:
Additional Information
A refrigerant noise might be generated
in units other than the one in operation.
The refrigerant is more likely to collect in the units with
thermo-OFF operation, and cause the units refrigerant
shortage. (Results in less capacity and increase of
discharge temperature.)
—
The performance of the unit might be somewhat
limited on this mode.
—
The performance of the HEAT operation is somewhat
reduced since the defrosting operation is frequently
performed.
Make sure that the unit is not excessively charged
with refrigerant before starting operation when
servicing or installing the units.
Power consumption is raised due to a higher
frequency. (The performance would not be raised at the
maximum operating frequency.)
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
Make sure to connect the connectors to the compressor
after checking the electrical parts.Be careful not to get
an electric shock while working on electrical parts.
Power consumption raises while the operation is
stopped.
—
—
It performs the defrosting operation forcedly.
(HEAT operation is stopped temporarily.)
Cannot be set when the centralized control
is ON.
About the Silent mode/Demand control setting, refer to
"8-6. OUTDOOR UNIT INPUT/OUTPUT CONNECTOR".
57