Daikin LRLEQ3BY1, Installation And Operation Manual

Page: 21 / 36

5 Installation
Installation and operation manual
21
LRMEQ+4BY1
Air-cooled refrigeration condensing unit
4P545024-1 – 2018.09
5.7.2 Guidelines when knocking out knockout
holes
NOTICE
Precautions when making knockout holes:
▪ Avoid damaging the casing.
▪ After making the knockout holes, we recommend you
remove the burrs and paint the edges and areas
around the edges using repair paint to prevent rusting.
▪ When passing electrical wiring through the knockout
holes, wrap the wiring with protective tape to prevent
damage.
b
c
a
a Knockout hole
b Burr
c Sealant etc.
5.7.3 Guidelines when connecting the electrical
wiring
Tightening torques
Wiring Screw size Tightening
torque (N•m)
X1M: power supply wiring
(power shielded
ground)
M5 2.2~2.7
X2M: remote operation
switch, low-noise switch
and transmission output M3.5 0.8~0.97
X3M: output signals M4 2.39~2.91
5.7.4 To connect the electrical wiring on the
outdoor unit
NOTICE
▪ Follow the wiring diagram (delivered with the unit,
located at the inside of the service cover).
▪ Make sure the electrical wiring does NOT obstruct
proper reattachment of the service cover.
1 Remove the service cover.
2 Connect the remote operation switch as follows:
B A C F1 F2
X2M
D
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 ".
3 Connect the low-noise switch as follows:
B A C F1 F2
X2M
D
NOTICE
Low-noise switch . If you want to remotely turn ON/OFF
low-noise operation (see setting [2‑18]), you must install a
low-noise switch. Use a voltage-free contact for
microcurrent (≤1 mA, 12 V DC). Connect to X2M/A+B.
4 If you want to connect the modbus communication box ,
connect the transmission wiring as follows:
B A C F1 F2
X2M
D
5 Connect the wiring to the output signals terminal (X3M) as
follows:
C1 C W1 R P1 P2
a b c d
a Caution signal
b Warning signal
c Run signal
d Operation signal
▪ Respect the following guidelines:
Output signal Guideline
Caution and Warning signal Connection recommended
when system malfunctions
are likely to occur.
Run signal Connection optional.
Operation signal Connection mandatory.
Connect the operation signal
to the solenoid valves that are
installed upstream of the
expansion valves of the
indoor unit. The outdoor unit
controls the solenoid valve
opening:
▪ During start-up, to prevent
liquid refrigerant from
entering the compressor.
▪ During oil return operation.
See "5.7.1 Field wiring:
Overview" on page 20 for
more details.
CAUTION
When connecting the power supply, the earth connection
must be made before the current-carrying connections are
established. When disconnecting the power supply, the
current-carrying connections must be separated before the
earth connection is. The length of the conductors between
the power supply stress relief and the terminal block itself
must be as such that the current-carrying wires are
tautened before the earth wire is in case the power supply
is pulled loose from the stress relief.
NOTICE
Never connect the power supply to terminal blocks X2M or
X3M. Otherwise the entire system may break down.