17
When using a phase-phase power supply, use a tester to determine
which of the two wires has the greater potential compared to the
earth and connect it to the L terminal. Connect the remaining wire to
the N terminal.
For floating power supplies, that is, those that have no earth con-
nection, an insulation transformer must be used, with a secondary
unit connected to the earth.
The following are obligatory:
- A multi-pole trip-switch must be used to disconnect the line, that
conforms to the CEI-EN 60335-1 standards (contact opening at
least 3,5mm, category III).
- Use cables with a 1,5 mm
2
section and respect the L (Phase) –
N (Neutral) connection.
- The amperage on the switch must be adequate for the boiler’s
electrical power rating – see the technical data to check the elec-
trical power rating for the model installed.
- Connect the equipment to an efficient earthing system.
- The power socket must be inaccessible after installation.
The use of gas or water pipes to earth this equipment is forbidden.
The manufacturer does not accept any responsibility for any dam-
age caused due to the lack of a proper earth or failure to comply
with the wiring diagram.
CONNECTING THE SYSTEM CONTROL BOARD TO THE CON-
NECT AT/BT CONNECTION BOX TERMINAL BOARD
Use the cables provided in the kit, and follow the instructions below:
1. 5-pole low temperature control cable
2. High temperature control cable with prods.
3. Screened signal cable with 2-pole connector.
1.5-pole low temperature control cable
FIG. 14a-14b
1. 5-pole low temperature control cable
Connect the 5-pole connector to the electronic system control
board.
FIG. 15a-15b
2. High temperature pump control cable with prods.
Connect the two prods to the boiler’s terminal board
FIG. 16a-16b
3. Screened signal cable with 2-pole connector.
Connect the NTC sensor connector on the electronic system
control board end.
Connect the two prods for the low temperature limit thermostat
to the boiler’s terminal board
FIG. 17
Connect the shielded cable connector (on the Connect part) to
the NTC (3) probe and the other 2 terminal clips to the 2
thermostats, jumpering them with the jumper on the cable (fig.
18).
INSTRUCTION TO RESET THE MANUAL HIGH LIMIT
THERMOSTAT INTERVENTION
The permanent signal of 77 flashing alarm (refer to the boiler i
nstrucions) may be caused by the manual high limit thermostat
intervention.
T. intervention 63°C.
If the 77 alarm is permanent operate as follows:
FIG. 18
- open the front cover of the Connect
- push the red button on the thermostat positionned on the pipe
- verify tha the 77 signal desappears after a while
- close the front cover of the Connect
If signal 77 is still displaied wait to the cooling of the system before
a new attempt the unlock.
CONNECTING THE CONNECT AT/BT TO THE ELECTRICITY
MAINS
FIG. 19
Connect the Connect AT/BT unit to the electricity mains (phase /
neutral / earth) using the cable supplied.
Drawing the power supply for the Connect AT/BT from the
boiler is absolutely forbidden as the boiler’s fuse is not sized
to take the electrical loads associated with the Connect AT/BT.
CONNECTING THE AMBIENT THERMOSTAT (TA)
FIG. 12a-12b
Boilers from inside only: The TA of the low temperature system is
connected to terminal M2A
Boilers from outside only: The TA of the low temperature system
is connected to terminal C4P
The TA for the low temperature system must be connected to termi-
nal M2A.
CONNECTING THE EXTERNAL SENSOR
Connect the external sensor to the boiler as indicated in the in-
struction manual for the boiler.
FIRST STARTING UP
Before switching the Connect AT/BT on, check that the electrical
and plumbing connections have been formed correctly.
FIG. 17
During testing, the temperatures can be checked due to the two
thermometers.
CIRCULATION PUMPS
The Connect AT/BT is supplied with circulation units with a three-
speed control.
Choose the best speed to suit the specific characteristics of the
systems.
RELEASING THE PUMPS IF NECESSARY
If the unit has been inactive for a lengthy period of time and the
circulation units are stuck, unscrew the caps on the front and turn
the shaft for the circulation unit motor using a screwdriver.
Do this extremely carefully so as not to damage the components
themselves.
THREE-WAY MIXING VALVE
If the unit has been inactive for a lengthy period of time and the
MIXER VALVE
is stuck, activate the lever in the motor by hand, in
order to release the gate in the valve.
PROGRAMMING PARAMETERS
To set the parameters for working with the Connect AT/BT:
Access the boiler’s programmable parameters as indicated in the
“programming parameters” chapter of the boiler’s instruction
manual.
Heating mode
Select parameter 20 (heating mode), choose option 6 (Connect
AT/BT) and confirm it.
Responsiveness of the external sensor
Select parameter 65 (responsiveness of the external sensor) to suit
the needs and characteristics of the installation, as described in the
boiler manual.
