Daikin LRLEQ3BY1 [11/36] Preparation
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Daikin LRLEQ3BY1 [11/36] Preparation

Daikin LRLEQ3BY1 [11/36] Preparation
4 Preparation
Installation and operation manual
11
LRMEQ+LRLEQ3+4BY1
Air-cooled refrigeration condensing unit
4P545024-1 – 2018.09
Description Model name
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
"4.2.3Refrigerant piping material"on page10 and
"4.2.4To select the piping size"on page10.
INFORMATION
Maximum 8 branches can be connected to a header.
4.2.6 Refrigerant piping length and height
difference
The piping lengths and height differences must comply with the
following requirements.
(see example in "4.2.4To select the piping size"on page10)
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
4.2.7 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 LRMEQ3+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 LRLEQ3+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
4.3 Preparing electrical wiring
4.3.1 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
LRMEQ3 +
LRLEQ3
6.5A 16A 3N~ 50Hz
380-415V
LRMEQ4 +
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 ".
The operation switch is located in the switchbox (see illustration
below).
REMOTE
OFF
ON
The operation switch can be set to the following three positions:
Operation switch setting Function
OFF Unit operation turned OFF
ON Unit operation turned ON
Remote Unit controlled (ON/OFF) with remote
operation switch

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