14 Piping installation
Installation and operation manual
30
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P546222-1B – 2020.10
p< p>
R410A
N2
C
D
b
c
e
a
g
h
f
d
A
B
a
Pressure reducing valve
b
Nitrogen
c
Weighing scales
d
Refrigerant R410A tank (siphon system)
e
Vacuum pump
f
Liquid line stop valve
g
Gas line stop valve
h
High pressure/low pressure gas line stop valve
A
Valve A
B
Valve B
C
Valve C
D
Valve D
4
Do one of the following:
If
Then
4a
The calculated additional
refrigerant amount is reached
by above pre-charging
procedure
Close valve B and disconnect
the manifold from the liquid
line.
4b
The total amount of
refrigerant could not be
charged by pre-charging
Close valve B, disconnect the
manifold from the liquid line,
and perform steps 5~6.
INFORMATION
If the total additional refrigerant amount was reached in
step 4 (by pre-charging only), 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.
Additionally, input the additional refrigerant amount into the
system via setting [2-14].
Perform
the
test
procedure
as
described
in
38].
Charging refrigerant
5
After pre-charging, connect valve A to the refrigerant charge
port and charge the remaining additional refrigerant through this
port. Open all outdoor unit stop valves. At this point, valve A
must remain closed!
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R410A
a
c
d
b
A
a
Weighing scales
b
Refrigerant R410A tank (siphon system)
c
Vacuum pump
d
Refrigerant charge port
A
Valve A
INFORMATION
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.
NOTICE
▪ 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.
6
Proceed with one of the following:
6a
"Step 6a: To automatically charge refrigerant"
6b
"Step 6b: To manually charge refrigerant"
INFORMATION
After charging refrigerant:
▪ Record the additional refrigerant amount on the
refrigerant label provided with the unit and attach it to
the backside of the front panel.
▪ Input the additional refrigerant amount into the system
via setting [2‑14].
▪ Perform
the
test
procedure
described
in
14.4.6
Step 6a: To automatically charge
refrigerant
INFORMATION
The automatic refrigerant charging has limits as described
below. Out of these limits, the system cannot operate the
automatic refrigerant charging:
▪ Outdoor temperature: 0~43°C DB.
▪ Indoor temperature: 10~32°C DB.
▪ Total indoor unit capacity: ≥80%.
When "
" or "
" starts flashing (ready for charging), push
BS2 within 5 minutes. Open valve A. If BS2 is not pushed within 5
minutes, a malfunction code will appear:
If
Then
Heating operation
"
" will be flashing. Push BS2 to
restart the procedure.
Cooling operation
Malfunction code "
" will appear. Push
BS1 to abort and restart the procedure.
Test run including detailed refrigerant status check is required to use
the
leak
detection
functionality.
More
information,
see
38].
If
Then
"
", "
", or "
"
appears
Push BS1 to finish the automatic
charging function procedure. The
ambient conditions are favourable to
execute the test run.
"
", or "
" appears
The ambient conditions are NOT
favourable to execute the test run. Push
BS1 to finish the automatic charging
procedure.
INFORMATION
In case a malfunction code occurred during this automatic
charging procedure, the unit will stop and indicate "
"
flashing. Push BS2 to restart the procedure.
Summary of Contents for REYQ8U7Y1B
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