5 Installation
Installation and operation manual
22
RWEYQ8~RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1A – 2017.04
A1P
5.8.6
To connect the power supply
The power supply must be clamped to the plastic bracket using field
supplied clamp material.
The green and yellow striped wire must be used for earthing only
(refer to the figure below).
e
i
f
b
a
c
d
h
e
g
a
Power supply (380~415 V - 3N~ 50 Hz
OR
400 V -
3N~ 60 Hz)
b
Fuse
c
Earth leakage protector
d
Earth wire
e
Power supply terminal block
f
Connect each power wire: RED to L1, WHT to L2, BLK to
L3 and BLU to N
g
Earth wire (GRN/YLW). When connecting the earth wire, it
is recommended to perform curling.
h
Clamp the power supply to the bracket using a field
supplied clamp to prevent external force being applied to
the terminal.
i
Cup washer.
Multiple outdoor units
To connect the power supply for multiple outdoor units to each other,
ring tongues have to be used. No bare cable can be used.
In that case, the ring washer that is installed by default should be
removed.
Attach both cables to the power supply terminal as indicated below:
L1 L2 L2 N
5.8.7
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
"4.3.3 About the water flow rate" on page 11
.
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.
In case of a multi outdoor unit system, install one or more flow
switches depending on the installation of the water system so that
water flow is guaranteed under every condition.
NOTICE
If the flow switch is installed in a variable water flow
system, take into account the inertia of the water flow. If a
variable water flow system is used, the flow switch control
should be linked to the compressor operation using the
multifunction output terminal "b".
Failure to do so will result in unintended "forced thermo off"
conditions.
Example:
