46
Disconnect the appliance from the electrical power supply via the external disconnec-
ting switch only after having performed the shutdown cycle (via the DDC or consent
switch) and having waited for it to terminate (approximately 3 minutes).
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.
5�2
ELECTRICAL CONNECTIONS FOR THE SYSTEM CIRCULATOR
The primary plant water circulator can be controlled directly by the appliance's on-
board electronics.
CONNECTION FOR CONTROLLING INDEPENDENT CIRCULATORS
This connection applies to hydraulic circuits which have a primary circuit circulator
for each appliance (independent circulators) installed on the plant. For example: 1
circulator/1 appliance; 5 circulators/5 appliances.
In such cases, for each appliance it may be sufficient to install a single-phase water
circulator (230 V AC), with power absorption less than 700 W.
To make the circulator-appliance connections, proceed as follows (references to Figure
5.5 Direct control of independent circulator
→
47):
You will need: the appliance connected hydraulically; single-phase water circu-
lator (230 V AC), with power absorption less than 700 W. Necessary equipment and
materials.
In this case, the circulator’s 230 V AC power can be taken directly off the appliance’s
internal terminal block (on the electrical panel).
Remove the appliance's front panel and open the electrical panel by removing
1.
the bolts securing it.
Prepare a suitable cable for the connection.
2.
Locate terminal block MC and the "NO Contact" terminals on controller S70
3.
(SCH) inside the electrical panel, and hook up as shown in the example.
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:
