Panasonic U-5MX4XPQ Manuel D'installation page 21

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 9.
2 The amount of pre-charging is 10 kg less than the calculated
amount.
3 Open valve C (valves A and B and the stop valves must be left
closed) and charge the refrigerant in liquid form via the liquid
side stop valve service port.
(See figure 28)
1 Measuring instrument
2 Tank (siphon system)
3 Charge hose
4 Liquid line stop valve
5 Gas line stop valve
6 Stop valve service port
7 Valve B
8 Valve C
9 Valve A
10 Outdoor unit
11 Refrigerant charge port
12 To indoor unit
13 Interunit piping
14 Refrigerant flow
4 If the calculated amount of pre-charging is reached, close
valve C.
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.
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 29)
1 Measuring instrument
2 Tank (siphon system)
3 Charge hose
4 Liquid line stop valve
5 Gas line stop valve
6 Stop valve service port
7 Valve B
8 Valve C
9 Valve A
10 Outdoor unit
11 Refrigerant charge port
12 Field piping
13 Refrigerant flow
14 Indoor unit
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 ±22 kg in
1 hour time at an outdoor temperature of 30°C DB
or with ±6 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 29.
U-5~18MX4XPQ
Urban Multi air conditioner
4PW28163-1C
1. Start of automatic charging refrigerant
- Open the liquid and gas side stop valves and the service port
stop valve. (Valves A, B and C must be closed.)
- Close all frontpanels except the electric box frontpanel and
turn the power ON.
- Make sure all indoor units are connected, refer to "11.3. How
to check how many units are connected" on page 16.
- 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
"3 Normal system display" on page 21.
If the H2P led is flashing, check the malfunction code on the
remote controller "4 Remote controller malfunction code
display" on page 21.
2. 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
3. Press the button once.
BS4 TEST
H1P H2P H3P H4P H5P H6P H7P
w w w w w w w
4. Hold the button down for 5 seconds or more.
BS4 TEST
5. Charging mode judgement
For automatic charging, the charging must be done in cooling
mode.
However, if the indoor temperature is 20°C DB or lower, in some
cases the unit will first charge in heating mode to increase the
indoor temperature.
The unit will automatically select the cooling mode or heating
mode for charging.
During charging in heating mode, a person must
manually close valve A before complete charging is
finished. The required amount is the the calculated
amount (see "6.6. Example of connection" on page 8)
minus 10 kg, therefore, the weight must be monitored
constantly.
Continue with the automatic charging in cooling
mode OR in heating mode.
Charging in heating mode
6. Start up
Wait while the unit is preparing for charging in heating mode.
H1P H2P H3P H4P H5P H6P H7P
Pressure control x c x x x x w
(for the first minute)
Start up control c c x x x w x
(for the next 2 minutes)
c c x x x w w
Waiting for stable
heating conditions
(for the next ±15
minutes (according to
the system))
7. Ready
H1P H2P H3P H4P H5P H6P H7P
c c x x w x w
Press the button once within 5 minutes.
BS4 TEST
If the button is not pushed within 5 minutes, P2 will be
BS4 TEST
displayed on the remote controller. Refer to "4 Remote controller
malfunction code display" on page 21.
Installation manual
18