Daikin REMQ5U7Y1B, Installer And User Reference Manual

Page: 118 / 176

19 | Electrical installation
Installer and user reference guide
118
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
j Cooling-only VRV indoor unit / Heating-only Hydrobox unit
INFORMATION
U-series units cannot share the same refrigerant circuit with T-series units. However,
electrically, U-series units and T-series units can be connected via F1/F2.
▪ The interconnecting wiring between the outdoor units in the same piping system
must be connected to the Q1/Q2 (Out Multi) terminals. Connecting the wires to
the F1/F2 terminals results in system malfunction.
▪ The wiring for the other systems must be connected to the F1/F2 (Out-Out)
terminals of the PCB in the outdoor unit to which the interconnecting wiring for
the indoor units is connected.
▪ The base unit is the outdoor unit to which the interconnecting wiring for the
indoor units is connected.
19.4 To finish the transmission wiring
After installing the transmission wires inside the unit, wrap them along with the on-
site refrigerant pipes using finishing tape, as shown in figure below.
b
a
f
c
d
f
e
f
a Liquid pipe
b Gas pipe
c Finishing tape
d High pressure/low pressure gas pipe
e Transmission wiring (F1/F2)
f Insulator
19.5 To route and fix the power supply
NOTICE
When routing earth wires, secure clearance of 25 mm or more away from
compressor lead wires. Failure to observe this instruction properly may adversely
affect correct operation of other units connected to the same earth.
The power supply wiring can be routed from the front and left side. Fix it to the
lower mounting hole.