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Electrical installation
Installer and user reference guide
113
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
L1 L2 L2 N
19.7 To connect the optional wiring
For the optional wiring use insulated wires of a rated voltage of 250 V or higher
and a minimal cross section of 1.25 mm² for single core wires and 0.75 mm² for
multicore wires.
Variable water flow
The variable water flow output signal is a low voltage control signal which
generates an output of 2~10 V DC depending on the required water flow rate
through the plate heat exchanger. For more information, see
81].
NOTICE
The maximum output power of the 2~10 V DC output signal is 50 mW. Exceeding this
power can result in damage of the system.
Always use shielded cables with a minimal cross section of 0.75 mm² and a length
limited to 100 m.
The control line of the valve/pump should be connected to the X2M connector in
the electrical switchbox. To connect the valve/pump to the outdoor unit, also
provide a separate 12 V DC power supply (with an output power of at least 50 mW)
to the X2M connector.
Connect the valve/pump to: X2M terminals 2 and 3.
Connect the power source to X2M terminals 1 and 3 (respect the polarity).
BLK
INTER
LOCK
TW1
IN
TW2
OUT
WHT
BLU
BLU
BLU
YLW
ORG
RED
BRN
+ –
1 2 3 4 5 6 7 8 9 10
X2M
+
–
2~10 V DC
12 V DC
a
b
X2M
a
Valve/pump
b
Power supply
NOTICE
Make sure to connect a flow switch to your water-cooled VRV IV system. Running the
system with a flow rate below the minimum requirement can result in damage of the
system.
Interlock
It is mandatory to connect a flow switch to the interlock circuit of the outdoor unit.
Running the system with a flow rate below the minimum requirement can result in
damage of the system. The flow switch should be installed in the main water circuit
between the plate heat exchanger and the closed valve. Select a flow switch
contact of at least 15 V DC, 1 mA.
Connect the flow switch to: X2M terminals 5 and 6.
