48
CONNECTIONS FOR CONTROLLING A SHARED CIRCULATOR
This connection applies to hydraulic circuits which have a single primary circuit circu-
lator for multiple appliance (shared circulator) installed on the plant. For example: 1
circulator/3 appliances.
In such cases, a three-phase water circulator (400 V AC) may be required.
The choice of water circulator depends on the number of appliances being served
as the specifications of the system (water flow rate, head, etc.) which are determi-
ned during the design process. Always follow the specifications of the system design
documentation.
The following procedure refers to Figure 5.6 Direct control of shared circulator
→
49,
which gives an example of a three-phase circulator (400 V AC) connection.
To make the circulator-appliance connection, proceed as follows (references to Figure
5.6 Direct control of shared circulator
→
49):
You will need: the appliances hydraulically connected; water circulator in line with the
system specifications (e.g.: three-phase/400 V AC); external electrical panel configured
by the installation technician. Necessary equipment and materials.
Make sure that the external electrical panel is equipped with a power switch (4-pole)
with suitable motor thermal switch, a secondary SELV safety transformer and control
relay.
On each appliance, remove the front panel and open the electrical panel by re-
1.
moving the bolts securing it.
Prepare a suitable cable for the connection.
2.
Locate the "NO Contact" terminals on the S70 controller of each appliance and
3.
hook up as shown in the Figure.
Make sure the ground cable is longer than the live cables. 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 ground connection. Do not use gas pipes to ground electrical
appliances.
A wiring error, as well as impeding the correct operation of the appliance, could also
damage the electrical apparatus that it contains.
The "NO Contact" terminals are no voltage contacts with maximum power capacity of
700 W. These contacts control the circulator shutdown delay (2 minutes after applian-
ce shutdown). Check the position of jumper "J2", as follows:
Locate, on each appliance's controller (SCH), jumper "J2" on the S70 (bottom
1.
right, below the "NO Contact" contacts) and make sure that it is set as shown in
detail "A" (jumper open) of the figure.
On completion, restore the appliances to their fully assembled condition.
2.
The insertion of relays or other electrical components inside the General Electrical Pa-
nel of the appliance is not permitted. Do not activate the appliance if the hydraulic
plant has not been filled.
