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3.2.13. Room thermostat connection (optional)
The boiler can be connected to a room thermostat (not provided with the boiler).
Room thermostat contacts must be properly sized for 5 mA at 24 V D.C.
The room thermostat wiring must be connected to the M9 terminal shown in pic. 29, after removing the jumper supplied as a standard fitting.
The room thermostat wiring must NOT be grouped together with mains cables.
3.2.14.
Open Therm
remote control installation (optional)
The boiler can be connected to an
Open Therm
remote control device (optional).
Install as follows:
• Install the REMOTE INTERFACE printed circuit board included in the Remote Control Kit (required for connecting the remote control to the
boiler), following the instructions provided with the kit.
• Position the remote control on a wall inside the premises, far from sources of heat or draughts.
• Separate the rear part of the housing (grey) from the front part (white) using a screwdriver and secure the rear part to the wall via the ope-
nings A (pic. 26).
• Connect the remote control up to the boiler, connecting positions 1 and 2 of the remote control (pic. 26) to the terminal board OPENTH M6
of REMOTE INTERFACE printed circuit board. The BUS connection is protected against false polarity, which means the connections can be
switched;
• use a two-wire power cable for the connection, with the following characteristics:
• maximum length: 40 metres;
• maximum impedance: 2 x 4Ω/m;
• interlaced or sheathed wires can be installed to prevent disturbance;
• remote control wires must not be routed together with power supply cables.
The remote control must not be connected to a 230V power supply.
• If an external probe or phone operation device does not need to be installed, close the remote control housing, otherwise follow the in-
structions given in the following subsections.
Refer to the manual supplied with the
Open Therm
remote control kit for programming instructions.
3.2.15. External temperature probe installation (optional) and “sliding temperature” operation
The boiler can be connected to an external temperature probe (optional ), which adjusts CH flow temperature for sliding temperature opera-
tion.
The manufacturer supplies two models of probe:
• 0KSONEST00: external probe for connection to the remote control;
• 0SONDAES01: external probe for direct connection to the boiler.
When the
Open Therm
remote control is employed, it is advisable to install the external probe for connection to the remote control, code
0KSONEST00.
For trouble-free operation of the boiler, use only external probes supplied by the Manufacturer.
External temperature probe has to be connected by means of a double insulated wire, minimum cross-section 0.35 sq.mm.
External temperature probe code 0KSONEST00 must be connected to positions 5 and 6 on the remote control (pic. 26).
External temperature probe code 0SONDAES01 must be connected to position M8 on the boiler’s printed circuit board (pic. 29).
External temperature probe wiring must NOT be grouped together with power mains supply cables.
pic. 26 - Installation of the Open Therm remote control
