Installation, user and maintenance manual
– GAHP-A
41
5.2
HOW TO CONNECT THE APPLIANCE ELECTRICALLY
Before making the electrical connections, make sure that work is not carried out on live
elements.
You will need:
the appliance in its permanent location.
1. Prepare a cable of the FG7(O)R 3Gx1.5 type for the power supply to the appliance.
2. Connect the appliance to the mains, fi tting in proximity to the mains a general
external bipolar circuit breaker (see detail «GS» in Figure 5.5 Electrical wiring
diagram on page 41) with 2 type T 5A fuses or a 10 A circuit breaker.
3. Make the electrical connection in such a way that the ground wire is longer than
the live wires. In this way it will be the last wire to be pulled away if the mains cable
should accidentally be pulled, and will thus guarantee the earth connection.
The electrical safety of the appliance is guaranteed only when it is correctly connected
to an effi
cient earthing system, executed in accordance with current safety regulations.
(BS7671 17th edition). Do not use gas pipes to ground electrical appliances.
Figure 5.5
– Electrical wiring diagram
Example of connection of appliance to 230 V 1 N - 50 Hz electricity supply
LEGEND
TER
terminal
board
L
phase
N
neutral
Components NOT SUPPLIED
GS
general
switch
5.3
CASCADE CONTROL
This paragraph illustrates the operations to be performed when one or more appliances
are connected to a Direct Digital Controller (DDC). In particular:
1. What is the CAN bus cable.
2. How to connect the CAN BUS cable to the appliance's controller
3. How to connect the CAN BUS cable to the DDC.
4. How to connect the DDC.
5. How to connect the plant water circulation pump.
For specifi c information regarding the DDC, refer to the specifi c manuals supplied with
it.
The appliance and the DDC communicate with each other via a CAN bus network.
The CAN bus network is characterized by a series of elements (appliances or DDCs)
called nodes, connected to each other by a three-wire cable. The nodes are of two types:
terminal nodes and intermediate nodes.
