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5 Preparation
1
A
B
C
D2
D1
F
E
H
2
2
3
e
f
d1
a
b
c
d2
1
Outdoor unit
2
Indoor unit (Showcase)
3
Indoor unit (Blower coil)
A~F
Liquid piping
a~f
Gas piping
H
Height difference outdoor-indoor
In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the following
into account:
▪ Select the pipe size nearest to the required size.
▪ Use the suitable adapters for the change-over from inch to mm
pipes (field supply).
▪ The additional refrigerant calculation has to be adjusted as
mentioned in
"6.7.3 To determine the additional refrigerant
amount" on
page 20.
A/a: Piping between outdoor unit and piping
branching
Use the same diameters as the connections on the outdoor units:
Liquid piping
Gas piping
B+C/b+c: Piping between piping branching
Use diameters depending on the total capacity of the indoor units
connected downstream.
Capacity
Liquid piping
<4.0 kW
4.0≤x<8.4 kW
Gas piping
<1.0 kW
1.0≤x<6.0 kW
6.0≤x<8.4 kW
D~F/d~f: Piping between piping branching and
indoor unit
Use the same diameters as the connections (liquid, gas) on the
indoor units.
NOTICE
If only 1 indoor unit is connected to the outdoor unit, and
the connections on the outdoor unit are different from
those on the indoor unit, then use the same piping
diameter as the connections on the outdoor unit, and install
suitable adapters as near to the indoor unit as possible.
5.3.5
Refrigerant piping length and height
difference
The piping lengths and height differences must comply with the
following requirements.
(see example in
"5.3.4 To select the piping size" on
Installer and user reference guide
12
3
Ø9.5 mm
Ø15.9 mm
Piping outer
diameter
Ø6.4 mm
Ø9.5 mm
Ø9.5 mm
Ø12.7 mm
Ø15.9 mm
page 11)
Requirement
Maximum actual piping length
▪ Example: a+b+c+d2≤Limit
Maximum total piping length
▪ Example: a+b+c+d1+d2+e+f≤Limit
Maximum length first branch kit-indoor
unit
▪ Example: b+c+d2≤Limit
Maximum height
Outdoor higher than
difference outdoor-
indoor
indoor
▪ Example: H≤Limit
Outdoor lower than
indoor
Maximum height difference indoor-indoor
(a)
A combination of showcases and blower coils is allowed if
they are installed on the same floor.
5.4
Preparing electrical wiring
5.4.1
Safety device requirements
Power supply
The power supply must be protected with the required safety
devices, i.e. a main switch, a slow blow fuse on each phase and an
earth leakage protector in accordance with the applicable legislation.
Selection and sizing of the wiring should be done in accordance with
the applicable legislation based on the information mentioned in the
table below.
Model
Minimum circuit
ampacity
LRMEQ3+4
13.5 A
Operation switch, low-noise switch and error output wiring
NOTICE
Operation switch. An operation switch is required to turn
outdoor unit operation ON/OFF. The outdoor unit cannot
operate without it. Use a voltage-free contact for
microcurrent (≤1 mA, 12 V DC).
NOTICE
Low-noise switch. If you want to remotely turn ON/OFF
low-noise operation (see setting [2‑25]), you must install a
low-noise
switch.
Use
microcurrent (≤1 mA, 12 V DC).
NOTICE
Error output. If system malfunctions are likely to degrade
the articles in the room/showcase, you can install an alarm
(example: lamp). If a malfunction occurs, a signal
(220-240 V AC) is given to the error output (X2M/E1/E2).
Use an alarm with a maximum load of 0.5 A.
Wiring
Maximum wiring length
Limit
30 m
30 m
10 m
5 m
0 m
(a)
0 m
Recommended
Power supply
fuses
16 A
3N~ 50 Hz
380-415 V
a
voltage-free
contact
for
Sheathed + shielded cable (2
wires)
Vinyl cords
0.75~1.25 mm²
130 m
LRMEQ3+4AY1
Air-cooled refrigeration condensing unit
4P442131-1 – 2016.03
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