Panasonic U-5MX4XPQ Installation Manual page 23

2 Adding refrigerant without using leak detection function
Charge with the outdoor unit at standstill
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. Open valve C (valves A and B and the stop valves must be left
closed) and charge the required amount of refrigerant through
the liquid side stop valve service port.
When the required amount of refrigerant is fully charged,
close valve C. Record the amount of refrigerant that was
added on the additional refrigerant charge label provided
with the unit and attach it on the back side of the front panel.
Perform the test procedure as described in "In case
refrigerant was added without using the leak detection
function (pre-charging, charging in heating mode)" on
page 26.
When the additional charging is not complete, perform the
procedure explained in the chapter "Charge with operating
outdoor unit" on page 20.
Charge with operating outdoor unit
Charge the refrigerant through valve A.
1. Start of charging refrigerant manually
- 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 below.
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
If the indoor temperature is 20°C DB or lower, charging in
cooling mode is not possible in some cases. The unit will
automatically select the cooling mode or heating mode for
charging.
When charging in cooling mode, the unit will stop
operating when the required amount of refrigerant is
charged.
During charging in heating mode, a person must
manually close valve A when complete charging is
finished. 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.
For the cooling only models, heating mode can not be
selected. In this case, the led disply will indicate out of
range. Refer to the procedure as described in "5 Final
adjustment of the amount of refrigerant" on page 22.
U-5~18MX4XPQ
Urban Multi air conditioner
4PW28163-1
Continue with the manually 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.
8. Operation
When the following led display is shown, open valve A and close
the frontpanel. If the frontpanel is left open, the system can not
operate properly during the refrigerant charging.
H1P H2P H3P H4P H5P H6P H7P
w c *
*
= The state of this led is not important.
When a malfunction occurs, check the display of the
remote controller and refer to "Remote controller
malfunction code display" on page 21.
9. Complete
If the calculated amount of refrigerant minus 10 kg is reached,
close valve A and press the
H1P H2P H3P H4P H5P H6P H7P
c c c w w w w
10. Press the button once and the charging is complete.
BS1 MODE
Record the amount that was added on the additional refrigerant
charge label provided with the unit and attach it on the back side
of the front panel.
Perform the test procedure as described in "In case refrigerant
was added without using the leak detection function (pre-
charging, charging in heating mode)" on page 26.
* * * *
button once.
BS3 RETURN
Installation manual
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