Daikin LRMEQ3BY1, Installation And Operation Manual

Page: 15 / 32

5 Installation
Installation and operation manual
15
4BY1
Air-cooled refrigeration condensing unit
4P495373-1 – 2017.07
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) and the determined additional
refrigerant amount.
5.5.2 To determine the additional refrigerant
amount
INFORMATION
For final charge adjustment in a test laboratory, contact
your dealer.
Formula:
R=[(X
1
× Ø9.5 )×0.06+(X
2
× Ø6.4 )×0.02]+A+B
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
A+B Parameters A and B
Parameter A :
If the total capacity
(a)
of showcases is... Then A is...
<5.0 kW 1.1 kg
5.0≤x<8.4 kW 2.3 kg
(a) Capacity at evaporating temperature of –10°C
Parameter B :
If the total capacity
(a)
of blower coils is... Then B is...
<5.0 kW 0.6 kg
5.0≤x<8.4 kW 1.2 kg
(a) Capacity at temperature difference (= evaporating
temperature – room temperature) of 10°C
Metric piping. When using metric piping, replace the weight factors
in the formula by the ones from the following table:
Inch piping Metric piping
Piping Weight factor Piping Weight factor
Ø6.4 mm 0.02 Ø6 mm 0.018
Ø9.5 mm 0.06 Ø10 mm 0.066
5.5.3 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>
N2
C
b c e
a
g
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
A Valve A
B Valve B
C Valve C
2 Open valves B and C.
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 Then
The determined additional
refrigerant amount is
reached
Disconnect the manifold from
the liquid line.
Continue with the "Checking
the sight glass" instructions.
Too much refrigerant is
charged
Recover refrigerant.
Disconnect the manifold from
the liquid line.
Continue with the "Checking
the sight glass" instructions.
The determined additional
refrigerant amount is
not
reached yet
Continue with the "Charging
refrigerant (with the
compressor running)"
instructions.
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 "6 Configuration" on
page 20 and "7 Commissioning" on page 23 into account.
7 Turn on the power of the outdoor unit, but leave the operation
switch turned off (see
"5.6.4 To connect the electrical wiring on
the outdoor unit" on page 18 ).
8 Set the target evaporating temperature with settings [2‑0] and
[2‑1] (see
"6.1.8 Mode 2: Field settings" on page 22 ).
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
"5.5.4 Error
codes when charging refrigerant" on page 16 and
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 10% of the determined
additional refrigerant amount (see
"5.5.2 To determine the
additional refrigerant amount" on page 15 ).
b
a
c d
O Sealing state (= sufficient refrigerant)
X Insufficient refrigerant
a Sight glass