Additional Refrigerant Charge - Panasonic U-5MX4XPQ Manuel D'installation

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").

11.4. Additional refrigerant charge

There are two ways to charge refrigerant. Use the selected method
following the described procedure below.
Adding refrigerant using leak detection function.
Refer to "1 Adding refrigerant using leak detection function" on
page 17
Adding refrigerant without using leak detection function.
Refer to "2 Adding refrigerant without using leak detection
function" on page 20
Adding refrigerant using the automatic refrigerant charging
function is recommended.
If refrigerant is added manually, without using the
automatic refrigerant charging function, the refrigerant leak
detection function cannot be used.
The refrigerant leak detection function can be used during
regular inspections or maintenance after installation of the
unit.
Installation manual
17
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
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. 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.
1
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 and outdoor units are turned on, the H2P-led
will be lit and the compressor will not operate.
NOTE See "11.2. Stop valve operation procedure" on
page 16 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
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.
1 Adding refrigerant using leak detection function
The automatic refrigerant charging has limits as described
below.
At out of limit, the system can not operate the automatic
refrigerant charging.
Outdoor temperature
Indoor temperature
Total indoor unit capacity
to re-attach the
: 0°C DB~43°C DB
: 20°C DB~32°C DB
: ≥80%
U-5~18MX4XPQ
Urban Multi air conditioner
4PW28163-1C