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6 Installation
6.7.3
To determine the additional refrigerant
amount
INFORMATION
For final charge adjustment in a test laboratory, contact
your dealer.
Additional refrigerant to be charged=R (kg). R should be rounded off
in units of 0.1 kg.
R=[(X
×Ø9.5)×0.059+(X
×Ø6.4)×0.022]+A1+A2
1
2
X
=Total length (m) of liquid piping size at Øa
1...2
Parameter A1:
(a)
If the total capacity
of showcases is...
<5.0 kW
5.0≤x<8.4 kW
(a)
Capacity at evaporating temperature of –10°C
Parameter A2:
(a)
If the total capacity
of blower coils is...
<5.0 kW
5.0≤x<8.4 kW
(a)
Capacity at temperature difference (= evaporating
temperature – room temperature) of 10°C
Metric piping. When using metric piping, please take into account
following table concerning the weight factor to be allocated. It should
be substituted in the formula for R.
Inch piping
Size (Ø) (mm)
Weight factor
6.4
0.022
9.5
0.059
6.7.4
To charge refrigerant
To speed up the refrigerant charging process, it is recommended to
first pre-charge a portion of refrigerant through the liquid line before
proceeding with the charging via the refrigerant charging port. It can
be skipped, but charging will take longer then.
Pre-charging refrigerant
Pre-charging can be done without compressor operation, by
connecting the refrigerant bottle to the service port of the liquid stop
valve.
1 Connect as shown. Make sure that all outdoor unit stop valves,
as well as valve A are closed.
p <
p >
A
B
g
f
a
d
C
N2
b
c
e
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
A
Valve A
B
Valve B
C
Valve C
2 Open valves C and B.
3 Pre‑charge refrigerant until the determined additional refrigerant
amount is reached or pre‑charging is not possible anymore, and
then close valves C and B.
Installer and user reference guide
20
Then A1 is...
1.1 kg
2.3 kg
Then A2 is...
0.6 kg
1.2 kg
Metric piping
Size (Ø) (mm)
Weight factor
6
0.018
10
0.065
4 Do one of the following:
If
The determined additional
refrigerant amount is reached
Too much refrigerant is
charged
The determined additional
refrigerant amount is not
reached yet
Checking the sight glass
If the determined additional refrigerant amount is reached by the
"Pre-charging refrigerant" instructions, continue as follows:
5 Open all outdoor unit stop valves.
6 Take all the precautions mentioned in
page 25
and
"8 Commissioning" on page 27
7 Turn on the power of the outdoor unit, but leave the external
operation switch turned off (see
wiring on the outdoor unit" on
8 Set the target evaporating temperature with setting [2‑8] (see
"7.2.8 Mode 2: Field settings" on
9 Turn on the power of the indoor units.
10 Turn on the external operation switch.
Result: The unit will start operation.
INFORMATION
▪ When a malfunction is detected during the procedure
(e.g., in case of closed stop valve), a malfunction code
will be displayed. In that case, refer to
codes when charging refrigerant" on page 21
solve the malfunction accordingly.
▪ Aborting the manual refrigerant charge is possible by
turning OFF the external operation switch. The unit will
stop and return to idle condition.
11 Check the sight glass of the outdoor unit. If the refrigerant is
NOT in sealing state, charge extra refrigerant as described in
the "Charging refrigerant (via the refrigerant charging
port)" instructions, but do NOT exceed 10% of the determined
additional refrigerant amount (see
additional refrigerant amount" on
b
a
O
Sealing state (= sufficient refrigerant)
X
Insufficient refrigerant
a
Sight glass
b
Full of liquid
c
A little foam in the liquid
d
A lot of foam in the liquid
12 Turn off the external operation switch.
Then
Disconnect the manifold from
the liquid line.
Continue with the "Checking
the sight glass" instructions.
Recover refrigerant.
Disconnect the manifold from
the liquid line.
Continue with the "Checking
the sight glass" instructions.
Disconnect the manifold from
the liquid line.
Continue with the "Charging
refrigerant (via the
refrigerant charging port)"
instructions.
"7 Configuration" on
into account.
"6.8.5 To connect the electrical
page 23).
page 27).
"6.7.5 Error
and
"6.7.3 To determine the
page 20).
c
d
LRMEQ3+4AY1
Air-cooled refrigeration condensing unit
4P442131-1 – 2016.03
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Troubleshooting
