How To Check How Many Units Are Connected; Additional Refrigerant Charge - Panasonic U-8ME4XPQM Manuel D'installation

11.4. How to check how many units are connected

It is possible to find out how many indoor units are active and
connected by operating the push-button switch on the printed circuit
board (A1P) of the working outdoor unit. In a multiple outdoor unit
system, you can find out how many outdoor units are connected to
the system by using the same procedure.
Make sure that all the indoor units connected to the outdoor unit are
active.
Follow the 5-step procedure as explained below.
The LEDs on the A1P shows the operating status of the outdoor
unit and the number of indoor units that are active.
x w
OFF
The number of units that are active can be read from the LED
display in the "Monitor Mode" procedure below.
Example: in the following procedure there are 22 units active:
NOTE Wherever during this procedure, press the
button if something becomes unclear.
BS1 MODE
You will return to setting mode 1 (H1P=
1 Setting mode 1 (default system status)
Default status (normal)
Press the button to switch from setting mode 1 to monitor
BS1 MODE
mode.
2 Monitor mode
Default status display
To check the number of indoor units, press the
To check the number of outdoor units, p
3 Monitor mode
Selection status of how many
connected indoor units to
display.
OR
Selection status of how many
connected outdoor units to
display.
Pressing the BS3 RETURN button causes the LED display to show the
data on the number of indoor units that are connected or how many
outdoor units that are connected in a multiple outdoor unit system.
4 Monitor mode
Displaying the number of
connected indoor units
Calculate the number of connected indoor units by adding the values of
all (H2P~H7P) blinking (c) LEDs together.
In this example: 16+4+2=22 units
Press the BS1 MODE button to return to step 1, setting mode 1
x
(H1P= "OFF").
U-8~16ME4XPQM
Urban Multi air conditioner
4PW40728-1
c
ON Blinking
x
"OFF").
H1P H2P H3P H4P H5P H6P H7P
x x w x x x x
H1P H2P H3P H4P H5P H6P H7P
c x x x x x x
BS2 SET button 5 times
BS2 SET
ress the button 8 times
H1P H2P H3P H4P H5P H6P H7P
c x x x w x w
H1P H2P H3P H4P H5P H6P H7P
c x x w x x x
H1P H2P H3P H4P H5P H6P H7P
c x c x c c x
32 16 8 4 2

11.5. Additional refrigerant charge

Adding refrigerant using the automatic refrigerant charging
function is recommended.
Follow the procedures below.
When charging a system, charging over the
permissible quantity can cause liquid hammer.
Always use protective gloves and protect your eyes
when charging refrigerant.
When the refrigerant charging procedure is done or
when pausing, close the valve of the refrigerant tank
immediately.
- The refrigerant charge port has a electric
expansion valve and will be closed at the end of
the refrigerant charging. However, the valve will be
opened when operating the unit after refrigerant
charging.
- If the tank is left with the valve open, the amount of
refrigerant which is properly charged may get off
point. More refrigerant may be charged by any
remaining pressure after the unit has stopped.
Electric shock warning
Close the electric box lid before turning on the main
power.
Perform the settings on the circuit board (A1P) of the
outdoor unit and check the LED display after the
power is on via the service lid which is in the lid of the
electric box.
Operate switches with an insulated
stick (such as a ball-point pen) to
avoid touching the life parts.
Make sure
inspection cover into the switch box cover after the job
is finished.
If the power of some units is turned off, the charging
procedure can not be finished properly.
In case of a multiple outdoor system, turn on the
power of all outdoor units.
Make sure to turn ON the power 6 hours before
starting the operation. This is necessary to warm the
crankcase by the electric heater.
If operation is performed within 12 minutes after the
indoor, HR unit and outdoor units are turned on, the
H2P-LED will be lit and the compressor will not
operate.
NOTE See "11.3. Stop valve operation procedure" on
page 17 for details on how to handle stop valves.
The refrigerant charging port is connected to the
piping inside the unit.
The unit's internal piping is already factory
charged with refrigerant, so be careful when
1
connecting the charge hose.
After adding the refrigerant, do not forget to close
the lid of the refrigerant charging port.
The tightening torque for the lid is 11.5 to
13.9 N•m.
In order to ensure uniform refrigerant distribution,
it may take the compressor ±10 minutes to start
up after the unit has started operation. This is not
a malfunction.
to re-attach the
Installation manual
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