The VXT heat pumps are completely wired
in the factory and on installation only require
connection to the electric power supply
mains. Please verify that the characteristics
of your electrical mains are suitable for the
absorption values indicated in the table of
electrical data (CHAPTER 8).
UNIT LINES AND DATA
NOTE
The cable sections shown in the Chapter 12
are recommended for a standard length;
For longer lengths, the PLANT ENGINEER is
responsible for the power supply line sizing
and the earth connection, according to:
- the length
- the type of cable
- the absorption of the unit, the physical
location and the environmental
temperature
The following electrical connections must
be made on the heat pump:
CONNECTION TO THE ELECTRIC
24.1.
POWER SUPPLY MAINS TABXX
Make sure that the electric line is not
−
live
To access the electric box:
−
Open the front panel by turning the
1.
screw ¼ of a turn
Open the panel by positioning the door-
2.
lock isolating switch at OFF (fig.6)
Pass the cables through the holes
−
prepared in the left side upper panel
Protect the cables using cable-glands
of suitable size.
Connection of the power line on the
−
terminal board of the L/N/PE versions
single-phase control board or by using
clamps L1/L2/L3/N/PE for the
three-phase versions.
Before electrically powering the
−
unit, make sure that all guards that
were previously removed have been
restored.
REMOTE CONTROL
24.2.
CONNECTION
PGD0 totally repeats the on-board
−
panel functions.
Place the cable away from the
−
power cables and any source of
interference
Do not lay the cable
in the vicinity of equipment that can
create electromagnetic interference.
The shielding must be connected to an
−
earth without interference.
Check that the continuity of the shielding
−
is effective for the entire length of the
cable.
For further information refer to the
accessory instructions, where envi-
sioned.
NOTE:
Check the tightness of all power wire clamps
on commissioning and after 30 days from
start-up. Then check the tightness of all
power clamps every 6 months. Loose
terminals can lead to overheating of cables
and components.
EXTERNAL AIR TEMPERATURE
24.3.
PROBE CONNECTION FOR
COMPENSATION SEE TAB. 9
Connect clamps 9 and 10 of the external
air probe kit with the respective clamps
9 -10 positioned inside the electric
control board of the VXT unit.
Use a cable with minimum section
of 0.5 mm and up to 50 m. for the
connection. Then pass to a section of
1 mm up to 100 m.
CONNECTION OF AN
24.4.
ADDITIONAL MODULE FOR
TEMPERATURE AND HUMIDITY
CONTROL (ACCESSORY KTU)
SEE TAB.11
CONNECTION OF SOLAR
24.5.
HEATING KIT (ACCESSORY KST)
SEE TAB.12
ELECTRIC CONNECTIONS
24.
All the electrical
operations must be
carried out by STAFF
IN POSSESSION OF
THE NECESSARY
QUALIFICATIONS BY
LAW suitably trained
and informed regarding
the risks related to
these operations
The features of the
electrical lines and of the
related components must
be determined by STAFF
QUALIFIED TO DESIGN
ELECTRIC SYSTEMS,
in compliance with the
international and national
regulations of the place
of installation of the unit
and in compliance with the
regulations in force at the
moment of installation
For the installation
requirements refer
only to the wiring
diagram supplied with
the appliance. The
wiring diagram along
with the manuals
must be kept in good
condition and ALWAYS
AVAILABLE FOR ANY
FUTURE SERVICING IN
THE UNIT.
It is mandatory to verify
that the machine’s
watertight integrity
before making the
electrical connections,
and it must only be
powered after the
hydraulic and electrical
works have been
completed.
I
ON
I O
N
O OFF
OFF
Fig.8.
35
