GB - 8
30RHV
Remove electric box cover.
Connect the wires to the terminals according to the wiring diagram
and firmly tighten.
• The characteristics of the available power supply must
correspond to the unit nameplate specifications.
• The voltage must be within the limits indicated in the technical
data table.
• The imbalance between voltage phases must always be less
than 2%.
• WARNING:
If the unit operates at a voltage outside the limits given in Table
VIII or with a phase imbalance above 2%, this constitutes
improper use and may affect the warranty.
If the phase imbalance is higher than 2%, contact the local
electricity board immediately.
• Electric wiring must be in accordance with data indicated in this
manual and the wiring diagram and conform to applicable local
and national regulations.
• Ensure that mains supply connection is made through a switch
that disconnects all poles, with contact gap of a least 3 mm.
• The mains supply connecting cable must be H07 RN-F (or
higher) type, synthetic rubber insulation with Neoprene coating,
according to EN 60335-1 codes.
IMPORTANT:
• Make earth connection prior to any other electrical
connections.
• Earthing is required by law.
The installer must earth the unit using the terminal marked
with the international earthing symbol.
• Before connecting the supply cable to the line, locate line
(L), lines (L1-L2-L3) and neutral N. Then make connections,
as indicated in the wiring diagram.
WARNING:
The supply line of three-phase units must be three-phase plus
neutral. Omission of the neutral N line could damage the single-
phase supplies.
• The wiring diagram for the electrical supply to remote controls/
interlocks is inside the unit, glued under the cover.
• See Table III for cables sizes and dimensions of the electrical
devices.
Power circuit supply
• The power circuit supply (three-phase plus neutral) must be
connected to the correct terminals (see wiring diagram).
• The auxiliary circuit supply is directly taken from one phase and
neutral and it is proteced by fuse "F".
• If the electrical supply cables L1 (R), L2 (S), L3 (T) are
connected in an incorrect sequence, the power supply is
interrupted after a few seconds by the control, which goes into
alarm status preventing the incorrect compressor rotation.
Note:
After connections have been completed, replace electric box
cover.
Electrical connections
Connections and water circuits
Correction factors for ethylene glycol
Ethylene glycol
10%
20%
30%
40%
Freezing
temperature
–4
°
C
–9
°
C
–15
°
C
–23
°
C
Capacity
0.996
0.991
0.983
0.974
Power input
0.990
0.978
0.964
1.008
Water flow rate
1.000
0.979
0.979
1.025
Pressure drop
1.003
1.010
1.020
1.033
Connections and water circuits
• The hydraulic circuit must be designed to ensure a steady water
flow through the evaporator at any time.
• The water pipes in the circuit must be well supported and firmly
fastened to ensure that they do not put a strain on the
connections to the unit.
• Water inlet and outlet are identified by a tag.
• Air purge and water drain are located at the inlet and outlet
connections and are closed by appropriate plugs.
• Pipes must have shut-off valves to permit emptying of the heat
exchanger without draining the whole system, as suggested in
the diagram.
To reduce to minimum system pressure drop it is necessary:
- to reduce number of bends;
- to avoid elbow bends;
- to reduce the system extension to a minimum;
- to use pipes of the correct diameter.
To avoid possible damage due to water freezing, it is
recommended to install the water refill system inside the building.
It is recommend:
- to fit a replaceable filter of at least 10 mesh/cm
2
in the water
inlet, especially with welded joint iron pipes.
Water changes or additions should be reduced, if possible, as
they contribute to oxidation and to calcium deposit formation.
The control can pilot an external pump with a current input of up to
8 Ampere.
Flow switch
The flow switch in the outlet line to the pump stops the
compressor operation in case of:
• pump failure;
• water circulation cut-off;
• presence of air un the system.
