To Charge Refrigerant - Daikin LRLEQ3BY1 Installation And Operation Manual

5 Installation
Formula for LRMEQ3+4
R=[(X ×Ø9.5)×0.06+(X ×Ø6.4)×0.02]+A+B
1 2
R Additional refrigerant to be charged [in kg and rounded off
to 1 decimal place]
X Total length [m] of liquid piping size at Øa
1...2
A+B Parameters A (for showcases) and B (for blower coils). See
tables below.
Parameter A
(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 B
(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
Formula for LRLEQ3+4
R=[(X ×Ø9.5)×0.06+(X ×Ø6.4)×0.02]+A+B–2.4
1 2
R Additional refrigerant to be charged [in kg and rounded off
to 1 decimal place]
X Total length [m] of liquid piping size at Øa
1...2
A Parameter A (in case showcases are used)=1.4 kg
B Parameter B (in case blower coils are used)=0.6 kg
Metric piping. When using metric piping, replace the weight factors
in the formula by the ones from the following table:
Inch piping
Piping Weight factor
Ø6.4 mm 0.02
Ø9.5 mm 0.06
5.6.3

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
a f
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 B and C.
Installation and operation manual
18
Then A is...
1.1 kg
2.3 kg
Then B is...
0.6 kg
1.2 kg
Metric piping
Piping Weight factor
Ø6 mm 0.018
Ø10 mm 0.066
3 Pre‑charge refrigerant until the determined additional refrigerant
amount is reached or pre‑charging is not possible anymore, and
then close valves B and C.
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 22 and "7 Commissioning" on page 25
7 Turn on the power of the outdoor unit, but leave the operation
switch turned off (see "5.7.4 To connect the electrical wiring on
the outdoor unit" on page 21).
8 Set the target evaporating temperature with settings [2‑0] and
[2‑1] (see "6.1.8 Mode 2: Field settings" on
9 Turn on the power of the indoor units.
10 Turn on the 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 19
solve the malfunction accordingly.
▪ Aborting the manual refrigerant charge is possible by
turning OFF the 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 (with the compressor running)"
instructions, but do NOT exceed 25% 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 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.
Continue with the "Charging
refrigerant (with the
compressor running)"
instructions.
"6 Configuration" on
into account.
page 24).
"5.6.4 Error
and
"5.6.2 To determine the
page 17).
c d
LRMEQ+LRLEQ3+4BY1
Air-cooled refrigeration condensing unit
4P545024-1 – 2018.09