Panasonic U-8ME4XPQM Manuel D'installation page 22

1 Procedure for additional refrigerant charge
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
Pre-charging
To speed up the proces of charging refrigerant for large systems, it is
recommended to first manually charge a portion of the refrigerant
first before performing automatic charging.
1 Calculate how much refrigerant to be added using the formula
explained in the chapter "How to calculate the additional
refrigerant to be charged" on page 10.
2 The amount of pre-charging is 10 kg less than the calculated
amount.
3 Open valve B (the valves A and C, the liquid pipe, the suction
gas pipe, the high pressure/low pressure gas pipe and the
equalizer pipe stop valves must be left closed) and charge the
refrigerant in liquid form via the liquid pipe stop valve service
port.
(See figure 24)
1 Measuring instrument
2 Refrigerant tank (R410A, siphon system)
3 Charge hose
4 Equalizer pipe stop valve
5 High pressure/low pressure gas pipe stop valve
6 Suction gas pipe stop valve
7 Liquid pipe stop valve
8 Refrigerant charge port
9 Valve A
10 Valve B
11 Valve C
12 To HR unit, indoor unit
13 Stop valve
14 Service port
15 Field piping
16 Refrigerant flow when pre-charging through the liquid stop valve
service port (refer to step 3 on page 19)
17 Refrigerant flow when automatic charging through the charge port
(refer to step 5 on page 19)
18 The refrigerant will be charged with ±30 kg in 1 hour at an outdoor
temperature of 30°C DB (12 kg at 0°C DB). If you need to speed
up in case of a multi system, connect the refrigerant tank to each
outdoor unit.
4 If the calculated amount of pre-charging is reached, close
valve B.
At least the unit should be charged with its original amount
of refrigerant (refer to the nameplate on the unit), before
starting the automatic charging.
NOTE When the leak detection function is not required,
complete charging when using the previous described
method (unit is not operating) can be done.
If it is not possible to charge the entire quantity through
the service port of the liquid pipe stop valve with the
unit not operating, refer to "14. Additional refrigerant
charging method" on page 26.
Installation manual
19
5
: 0°C DB~43°C DB
: 10°C DB~32°C DB
: ≥80%
1.
2.
3.
4.
5.
After pre-charging, perform the refrigerant charge operation as
shown below and charge the remaining refrigerant of the
additional charging amount through valve A. (See figure 24)
NOTE For a multi outdoor unit system, it is not required
to connect all charge ports to a refrigerant tank.
The refrigerant will be charged with ±30 kg in
1 hour time at an outdoor temperature of 30°C DB
or with ±12 kg at an outdoor temperature of
0°C DB.
If you need to speed up in case of a multiple
outdoor system, connect the refrigerant tanks to
each outdoor unit as shown in figure 24.
Start of automatic charging refrigerant
- Open the liquid pipe, suction gas pipe, high pressure/low
pressure gas pipe and equalizer pipe stop valves and the
service port stop valve. (Valves A, B and C must be closed.)
- Close all front panels except the electric box front panel and
turn the power ON.
- Make sure all indoor units are connected, refer to "11.4. How
to check how many units are connected" on page 18.
- If the H2P LED is not flashing (in 12 minutes time after
turning on the power), make sure it is displayed as shown in
the "2 Normal system display" on page 21.
If the H2P LED is flashing, check the malfunction code on the
remote controller "3 Remote controller malfunction code
display" on page 21.
If you perform the refrigerant charging operation
within the refrigerant system with one or more
units with power OFF, the refrigerant charging
operation can not be accomplished properly.
For confirming the number of outdoor units and
indoor units with power ON, refer to "11.4. How to
check how many units are connected" on
page 18.
In case of a multi system, turn the power ON to
all outdoor units in the refrigerant system.
To energize the crankcase heater, make sure to
turn the power ON at least 6 hours before
starting operation.
Press the button once if the LEDs combination is not
BS1 MODE
as in the figure below.
H1P H2P H3P H4P H5P H6P H7P
x x w x x x x
Press the button once.
BS4 TEST
H1P H2P H3P H4P H5P H6P H7P
w w w w w w w
Hold the button down for 5 seconds or more.
BS4 TEST
Charging mode judgement
However, if the indoor temperature is 10°C DB or lower, in some
cases the unit will charge in heating mode to increase the indoor
temperature.
The unit will automatically select the cooling mode or heating
mode for charging.
When charging in cooling mode, the unit will stop
operating when
refrigerant is charged.
During charging in heating mode, a person must
manually close valve A before complete charging
is finished. The required amount is the calculated
amount (see "6.6. Example of connection" on
page 9), therefore, the weight must be monitored
constantly.
the required amount of
U-8~16ME4XPQM
Urban Multi air conditioner
4PW40728-1