Electrical installer
Installation, use and maintenance manual – AY
29
4
Figure 4.8
Connection of the CAN bus cable to the control panel
DDC Direct Digital Controller
GND Common data
L
Data signal LOW
H Data signal HIGH
J21 CAN bus jumper on DDC board
A Detail of "terminal node" case (3 wires; J21 = jumper "closed")
B
Detail of "intermediate node" case (6 wires; J21 = jumper "open")
P8 CAN port/connector
DDC
GND
H L
JUMPER J21
P8
B
A
DDC
GND
H L
JUMPER J21
P8
4.4.5
External request
System (2), see also Paragraph 1.5.3
The following Table 4.2
p. 29 summarizes the features
associated with the different control devices.
Table 4.2
Available features depending on controls
Control devices
Description
External request
Heating at fixed temperature, based on the parameters set on the control panel onboard the boiler.
Activation/deactivation based on an external request, connected to the Ta-Ta terminals.
Room thermostat
Heating at fixed temperature, based on the parameters set on the control panel onboard the boiler.
Activation/deactivation based on the temperature detected by the room thermostat and its settings.
It is required to arrange:
▶
Enable device (e.g. thermostat, timer, switch, ...) fitted
with a voltage-free NO contact.
How to connect the external request
The connection of the external request is made on
the terminal block located in the electrical panel
inside the appliance (Figure 4.9
1. Access the electrical board of the appliance ac-
cording to the Procedure 4.2
2. Connect the two non-polarised conductors to the
Ta-Ta contacts.
Use a cable with a cross-section between 0,5 and
1,5 mm², with a maximum length of 50 metres.
For the AY 100 appliance, two separate requests
must be provided, one for each of the Ta1-Ta2 con-
tacts in the electrical panel, which correspond to
the two separate thermal modules of the appli-
ance.
Figure 4.9
External request connection
CR
External request/room thermostat
L
N
10
0
Ta
Ta
CR
4.4.5.1
Thermostat/chronothermostat location
Install the thermostat/chronothermostat according to the
following guidelines:
▶
Place it inside the heated room, in an area that is rep-
resentative of the room temperature, at about 1,5 m
from the floor, protected from draughts, direct expo-
sure to sunlight, influence by direct heating sources
(lamps, hot air flows, etc.).
▶
Avoid installation on walls bordering the outside, to
avoid distortion on the detected temperature and
therefore affect system operation. Otherwise, shield
the control system by placing a sheet of insulating ma-
terial (cork, polystyrene or other) between it and the