15 Electrical installation
Installation and operation manual
28
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1D – 2020.10
NOTICE
Applicable legislation on
fluorinated greenhouse gases
requires that the refrigerant charge of the unit is indicated
both in weight and CO
2
equivalent.
Formula to calculate the quantity in CO
2
equivalent
tonnes:
GWP value of the refrigerant × total refrigerant
charge [in kg] / 1000
Use the GWP value mentioned on the refrigerant charge
label.
2
Fix the label on the inside of the outdoor unit near the gas and
liquid stop valves.
14.6
Connecting water piping
14.6.1
About connecting the water piping
Before connecting the water piping
Make sure the outdoor and indoor units are mounted.
Typical workflow
Connecting the water piping typically consists of the following
stages:
1
Connecting the water piping of the outdoor unit.
2
Filling the water circuit.
3
Insulating the water piping.
14.6.2
To connect the water piping
a
b
a
Cooling water outlet
b
Cooling water inlet
Consult
"14.2.1 Water circuit requirements"
19] for the correct
tightening torque of the water piping connections.
14.6.3
To fill the water circuit
1
Connect the water supply hose to the fill valve (field supply).
2
Open the fill valve.
3
Run the pump ONLY and make sure that no air has been
caught in the water circulation system otherwise the plate heat
exchanger will freeze.
4
Check if the water flow rate is correct, otherwise the plate heat
exchanger will freeze. Measure any water pressure loss before
and after running the pump and make sure that the flow rate is
correct. If not, stop the pump immediately and carry out
troubleshooting.
14.6.4
To insulate the water piping
The outdoor water piping MUST be insulated to prevent
condensation during heating operation or to protect against freezing
at cold ambient temperatures.
See
"14.2.1 Water circuit requirements"
19] for more information.
15
Electrical installation
DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
15.1
Safety device requirements
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.
For standard combinations
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
RWEYQ8T9
15.5 A
20 A
RWEYQ10T9
16.4 A
20 A
RWEYQ12T9
19.4 A
25 A
RWEYQ14T9
22.3 A
25 A
RWEYQ16T9
31.0 A
32 A
RWEYQ18T9
31.9 A
32 A
RWEYQ20T9
32.7 A
35 A
RWEYQ22T9
35.8 A
40 A
RWEYQ24T9
38.9 A
40 A
RWEYQ26T9
41.7 A
50 A
RWEYQ28T9
44.6 A
50 A
RWEYQ30T9
49.1 A
50 A
RWEYQ32T9
52.2 A
63 A
RWEYQ34T9
55.3 A
63 A
RWEYQ36T9
58.3 A
63 A
RWEYQ38T9
61.2 A
63 A
RWEYQ40T9
64.0 A
80 A
RWEYQ42T9
66.9 A
80 A
For all models:
▪ Phase and frequency: 3N~ 50 Hz
▪ Voltage: 380~415 V
▪ Transmission line section: 0.75~1.25 mm
2
, maximum length is
1000 m. If the total transmission wiring exceeds these limits, it
may result in communication error.
For free combinations
Calculate the recommended fuse capacity.
Formula
Calculate, by adding the minimum circuit amps of each
used unit (according to the table above), multiply the
result by 1.1 and select the next higher recommended
fuse capacity.
