6 Installation
Installer and user reference guide
25
SERHQ020~0 SEHVX20~64BAW
Split packaged air-cooled water chiller
4P508020-1A – 2018.01
6.7.3
To determine the additional refrigerant
amount
INFORMATION
For final charge adjustment in a test laboratory, contact
your dealer.
The additional refrigerant charge calculation is based on the liquid
piping size.
Formula:
R=(X
Ø9.52
×0.059)+(X
Ø12.7
×0.12)
R
Additional refrigerant to be charged [in kg and rounded off
to 1 decimal place]
X
1, 2
Total length [m] of liquid piping size at
Øa
Example
SEHV 2× SERHQ032BAW1
R=(L1+L2)
Ø12.7
×0.12
6.7.4
To charge refrigerant
Pre-charging refrigerant
1
Calculate the additional amount of refrigerant to be added using
the formula mentioned in
"6.7.3 To determine the additional
refrigerant amount" on page 25
2
The amount to be pre-charged 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.
4
Close valve C when the calculated amount for pre-charging is
reached.
m
n
c
e
d
b
a
g
h
i
f
j
k
l
a
Weighing scales
b
Refrigerant R410A tank (siphon system)
c
Charge hose
d
Liquid line stop valve
e
Gas line stop valve
f
Stop valve service port
g
Valve B
h
Valve C
i
Valve A
j
Refrigerant charge port
k
Interunit piping
l
Refrigerant piping
m
Field piping
n
Gas flow
NOTICE
In case of maintenance and the system (outdoor unit+field
indoor units) does not contain any refrigerant any
more (e.g., after refrigerant reclaim operation), the unit has
to be charged with its original amount of refrigerant (refer
to the nameplate on the unit) by pre-charging before the
automatic charging function can be started.
INFORMATION
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.
5
After pre-charging, connect valve A to the refrigerant charge
port and charge the remaining additional refrigerant through this
port.
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: 20~32°C DB.
▪ Total indoor unit capacity: ≥80%.
The remaining additional refrigerant charge can be charged by
operating the outdoor unit by means of the automatic refrigerant
charge operation mode.
Depending on the ambient limitation conditions (see above), the unit
will automatically decide which operation mode will be used to fulfill
the automatic refrigerant charge: cooling or heating. If above
conditions are fulfilled, cooling operation will be selected. If not,
heating.
Procedure
1
Open the liquid and gas side stop valves and the service port
stop valve. (Valves A, B and C must be closed.)
2
Close all front panels except the electrical component box front
panel and turn the power ON.
3
If the H2P LED is flashing, check the malfunction code on the
user interface. See
"6.7.5 Error codes when charging
.
4
Push BS1 if the LED display is not as shown below.
5
Push BS4 once.
6
Push BS4 for at least 5 seconds.
7
This step is the charging mode judgement. Automatic charging
must be performed in cooling mode. However, if the indoor
temperature is 20°C DB or lower, the unit will first charge in
heating mode in order to increase the indoor temperature. The
unit will automatically select the cooling mode or heating mode
for charging.
NOTICE
When charging in heating mode, valve A must be closed
manually before complete charging is finished.
Automatic refrigerant charging in heating mode
1
Start up the unit and wait while it is preparing for charging in
heating mode.
Pressure control (first minute)
Startup control (next
2 minutes)
Waiting for stable heating
conditions (next ±15 minutes
(depending on the system))
Ready for charging
2
Press BS4 once within 5 minutes. If BS4 is not pushed within
5 minutes,
will be displayed on the user interface.
3
When the following LED display is shown, open valve A and
close the front panel. If the front panel is left open, the system
cannot operate properly during the refrigerant charging.
