Panasonic U-10MX4XPQ Installation Manual - page 20
Installation manual
17
U-5~18MX4XPQ
Urban Multi air conditioner
4PW28163-1
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
Follow the procedures below.
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.
2
Monitor mode
H1P
H2P
H3P
H4P
H5P
H6P
H7P
Default status display
c x
x
x
x
x
x
To check the number of indoor units, press the
button 5 times
To check the number of outdoor units, p
ress the
button 8 times
3
Monitor mode
H1P
H2P
H3P
H4P
H5P
H6P
H7P
Selection status of how many
connected indoor units to
display.
c x
x
x w x w
OR
H1P
H2P
H3P
H4P
H5P
H6P
H7P
Selection status of how many
connected outdoor units to
display.
c x
x w x
x
x
Pressing the
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
H1P
H2P
H3P
H4P
H5P
H6P
H7P
Displaying the number of
connected indoor units
c x c x c c x
32
16
8
4
2
1
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
button to return to step 1, setting mode 1
(H1P=
x
"OFF").
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.
BS2 SET
BS2 SET
BS3 RETURN
BS1 MODE
■
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 to re-attach the 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 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.
Outdoor temperature
: 0°C DB~43°C DB
Indoor temperature
: 20°C DB~32°C DB
Total indoor unit capacity
:
≥
80%