ISU-689:2016/GB
9
3.9. Connection of additional devices
An improperly made electrical connection may
Cause injury or material losses.
Touching live connections may cause electric shock and
as a consequence, it may cause a serious injury.
Remember to disconnect the boiler electrical power
before starting work.
Electrical connections may only be carried out by an
appropriately qualified person.
The boiler is equipped with additional electrical terminals, which
allow for connection of external devices to the boiler:
•
Room regulator
•
Remote control
OpenTherm®
•
Outdoor temperature sensor
•
Three-way valve for connecting the domestic hot water
•
Temperature sensor in domestic hot water tank
•
Cascade sensor (temperature measurement on hydraulic coupling)
•
PWM signal cable for external pump
•
Power supply of the solar pump
•
Solar sensor (temperature measurement in solar collector)
•
Alarm (relay which close the contact in case of error)
To access the terminals (see Fig. 3.9.1):
- remove the front cover of the boiler see Fig. 6.1.1.1
- unscrew 2 screws (1)
- move the control panel (2)
- after unscrewing the screws (3) and removing the cover (4) we get
access to terminals.
During the connection, wires of the additional devices should be
passed through the appropriate holes in the controller bracket (6)
and the proper culvert (5), then screw the ends of the wires to the
correct terminals.
Fig. 3.9.1
–
Access to electrical terminals
3.9.1. Description of connection terminals
High-voltage terminals:
~230
–
power cord
ALARM
–
in case of an error the contact is closed
CH, DHW, COM
–
connection terminals of a three-way valve
SOLAR PUMP
–
solar pump
Low-voltage terminals:
RT
–
room temperature regulator
OT
–
remote control
OpenTherm®
EXTERNAL SENSOR
–
outdoor temperature sensor
TANK SENSOR
–
temperature sensor in tank
CASC. SENSOR
–
cascade sensor
CASC. PWM
–
PWM signal for external pump
SOLAR SENSOR
–
solar sensor
MASTER
–
master connector of series connection of boilers into
cascade
SLAVE
–
slave connector of series connection of boilers into cascade /
diagnostic connector of the boiler
–
connection with PC
MASTER and SLAVE communication connectors are not
located in the control console casing. Connectors
appropriately described are located in bulk inside the
boiler.
Fig. 3.9.1.1
–
Description of electrical terminals
3.9.2. Connection of a room temperature regulator
3.9.2.1. Room regulator with contact
The boiler has been designed to cooperate with a room temperature
regulator which has got its own supply source and control contact
free from potential. Connections must be made according to the
instructions of regulator manufacturer. In order to connect the
temperature thermostat to the boiler the appropriate length two-
core wire is needed. It needs to be connected to terminals 1 and 2
marked as
RT
- previously separating the electrical bridge.
3.9.2.2. OpenTherm
®
remote control by Honeywell
The boiler is also adapted to connect the OpenTherm
® remote
control by Honeywell. In order to connect the Open
Therm® to the
boiler the appropriate length two-core cable is needed. It needs to
be connected to terminals 3 and 4 marked as
OT
. For any technical
information about the remote control OpenTherm
®
- see the
instruction manual supplied by the manufacturer of remote control
devices.
Note: When using OpenTherm® remote control, the RT terminals
must be free of electrical bridge and left unconnected.
3.9.3. Connecting the outdoor temperature sensor
To connect the outdoor temperature sensor use the 2 wire cable
with 0,5mm
2
cross section and connect it to terminals 5 and 6
OUTDOOR SENSOR. Connection must be made in accordance with
the instructions provided by the sensor manufacturer. It is the best
to place the outside temperature sensor on the north wall of the
building and it should not be exposed to direct sunlight.
3.9.4. Connecting the hot water tank to the system boiler
Domestic hot water tank must be connected to the boiler in
accordance with the Fig.3.5.1.
Connect the temperature sensor to the terminals in the control panel
marked with TANK SENSOR (remove the resistor).
The other end of the cable together with the sensor should be placed
in the tank in the place of the domestic water temperature sensor.
The electrical connection of the three-way valve shall be made
according to Fig. 3.9.3.1.
