U-5~18MX4XPQ
Urban Multi air conditioner
4PW28163-1
Installation manual
20
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
as in the figure below.
3.
Press the
button once.
4.
Hold the
button down for 5 seconds or more.
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.
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.
7.
Ready
Press the
button once within 5 minutes.
If the
button is not pushed within 5 minutes,
P2
will be
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.
*
= The state of this led is not important.
9.
Complete
If the calculated amount of refrigerant minus 10 kg is reached,
close valve A and press the
button once.
10. Press the
button once and the charging is complete.
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.
H1P
H2P
H3P
H4P
H5P
H6P
H7P
x
x w x
x
x
x
H1P
H2P
H3P
H4P
H5P
H6P
H7P
w w w w w w w
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.
BS1 MODE
BS4 TEST
BS4 TEST
H1P
H2P
H3P
H4P
H5P
H6P
H7P
Pressure control
(for the first minute)
x c x
x
x
x w
Start up control
(for the next 2 minutes)
c c x
x
x w x
Waiting for stable
heating conditions
(for the next ±15
minutes (according to
the system))
c c x
x
x w w
H1P
H2P
H3P
H4P
H5P
H6P
H7P
c c x
x w x w
H1P
H2P
H3P
H4P
H5P
H6P
H7P
w c
*
*
*
*
*
When a malfunction occurs, check the display of the
remote controller and refer to "Remote controller
malfunction code display" on page 21.
H1P
H2P
H3P
H4P
H5P
H6P
H7P
c c c w w w w
BS4 TEST
BS4 TEST
BS3 RETURN
BS1 MODE
Summary of Contents for U-5MX4XPQ
Page 33: ...4PW28163 1...
