5 Preparation
Installer and user reference guide
13
LRMEQ+4BY1
Air-cooled refrigeration condensing unit
4P500362-1A – 2018.09
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
To select refrigerant branch kits
For refrigerant piping branching, it is allowed to use T-joints, Y-joints,
refnet joints, and refnet headers. It is possible to use a refrigerant
branching option kit from the table below.
Description
Model name
Refnet header
(a)
KHRQ22M29H
Refnet joint
(b)
KHRQ22M20T
KHRQ22M29T9
(a)
Do NOT connect 2 or more headers in series. For the gas
side choose the refnet header so that the diameter of the
header is equal to the main piping diameter or equal to one
size-up of the main piping diameter.
(b)
Choose the refnet joint so that the incoming and outgoing
piping diameters match with one of the available diameters
of the refnet joint. For more information, see
"5.3.3 Refrigerant piping material" on page 12
"5.3.4 To select the piping size" on page 12
INFORMATION
Maximum 8 branches can be connected to a header.
5.3.6
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 page 12
)
Requirement
Limit
Maximum actual piping length
▪ Example: a+b+c+d2≤Limit
50 m
Maximum total piping length
▪ Example: a+b+c+d1+d2+e+f≤Limit
80 m
Maximum length first branch kit-indoor
unit
▪ Example: b+c+d2≤Limit
30 m
Maximum height
difference outdoor-
indoor
Outdoor higher than
indoor
▪ Example: H≤Limit
20 m
Outdoor lower than
indoor
10 m
Maximum height difference indoor-indoor
5 m
5.3.7
To select the expansion valve
This unit has a larger subcooling ratio for the liquid refrigerant
compared to units without a subcooling mechanism, as the liquid
refrigerant is being cooled by a double tube heat exchanger
(subcooling ratio = condensing temperature
–
liquid refrigerant
temperature at outdoor unit outlet).
When selecting an expansion valve for the load according to the
technical information of the expansion valve manufacturer, take into
account the subcooling ratio (K) for the liquid refrigerant in the table
below.
For 4
Subcooling ratio (K)
Te
–20°C
–15°C
–10°C
–5°C
0°C
5°C
Tc
20°C
10
9
8
7
6
5
25°C
11
10
9
8
7
6
30°C
12
11
10
9
8
7
35°C
13
12
11
10
9
8
40°C
14
13
12
11
10
9
45°C
15
14
13
12
11
10
50°C
16
15
14
13
12
11
55°C
16
15
14
13
12
11
For 4
Subcooling ratio (K)
Te
–45°C
–40°C
–35°C
–30°C
–25°C
–20°C
Tc
20°C
19
18
17
16
15
14
25°C
20
19
18
17
16
15
30°C
21
20
19
18
17
16
35°C
22
21
20
19
18
17
40°C
23
22
21
20
19
18
45°C
24
23
22
21
20
19
50°C
25
24
23
22
21
20
55°C
25
24
23
22
21
20
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
Recommended
fuses
Power supply
LRLEQ3
6.5 A
16 A
3N~ 50 Hz
380-415 V
LRLEQ4
9.1 A
Remote operation switch, low-noise switch and output signals
wiring
NOTICE
Remote operation switch
. The unit is factory-equipped
with an operation switch with which you can turn unit
operation ON/OFF. If you want to remotely turn outdoor
unit operation ON/OFF, a remote operation switch is
required. Use a voltage-free contact for microcurrent
(≤1 mA, 12 V DC). Connect to X2M/C+D, and set to
"Remote ".
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