16
7.7 ELECTRICAL
CONNECTIONS
Electrical systems of thermal plants designed only for heating purposes
must comply with numerous legal
regulations which apply to in general as well as specifically to each application or fuel type.
7.8 OPTIONAL CONTROL PANEL
The control panel (optional) with the boilers is made of self-extinguishing plastic and houses the regulation
and safety instruments:
LEGEND
1 PANEL
LIVE
2 BURNER SWITCH N. 1
4 HEATING PUMP SWITCH
7 BOILER
THERMOMETER
8 BOILER LIMIT THERMOSTAT
9 SAFETY THERMOSTAT N° 1
11 2nd FLAME THERMOSTAT
The upper part of the control panel can be rotated to gain access to the terminal board and uncoil the ther-
mostat and thermometer capillaries. A copy of the wiring diagram is contained inside the control panel cover.
The
control thermostats (TR1-TR2)
have an operating range from 0° to 100° and can be set by the user by
means of the front dial.
Safety limit thermostats (TS)
has a fixed setting of 110°C and can be manually reset.
For correct installation, refer to the boiler casing assembly instructions.
WIRING DIAGRAM
Refer to the diagram supplied with the specific switchboard.
7.9 STARTING
Open the gas tap (check if there is any gas leakage).
Switch on the burner and heating pump on the control panel.
At this point if the water temperature inside the boiler is less that the value set up on the control thermostat
and the room thermostat/timer (if present) is closed, the burner and the pump will run.
WARNING
It is common to find air inside the gas pipe-work, especially during the initial start up or after a long period of
without use. So if the flame failure occurs, repeat the same operation as previously explained.
NOTE: control pumps are running.
CONNECTION LIVE/NEUTRAL
If the connections of the live and the neutral are not correct, the burner will stop at the end of the
safety time (even if the burner is running).
