Connecting A Third Party Control Unit - DeDietrich MCA Pro 45 Installation And Service Manual

4. Installation

4.9.5. Connecting a third party control unit

Connecting modulating controller
OT OpenTherm regulator
The boiler is fitted with a OpenTherm connection as
standard.
As a result, modulating OpenTherm controllers can
be connected without further modifications (Room,
weather-dependent and cascade controllers).
• In the case of a room thermostat: Install the room
thermostat in the reference room (generally the
living room).
• Connect the two-wire cable to terminals
ON/OFF-OT of the connector.
i
If the DHW temperature can be set on the
OpenTherm controller, then the boiler supplies
this temperature, with the set value on the
boiler as the maximum.
Connect ON/OFF thermostat
Tk ON/OFF room thermostat
The boiler is suitable for connection to a 2 wire ON/OFF
room thermostat.
• Install the room thermostat in the reference room
(generally the living room).
• Connect the 2 wire 24V room thermostat to the
ON/OFF-OT terminals of the connector.
i
If a room thermostat with an anticipation
element is used, this must be converted using
parameter p5.
Note: This boiler is not suitable for a Nest type
thermostat without an external AC power supply.
- Standard boiler configuration : DC 24v - 7mA
- Optional boiler configuation
MCA-Pro ISM Rv.4.1 2/2017
: DC 24v - 120mA
MCA Pro 45/65/90/115
On/off
OT BL RL Tout Tdhw
On/off
OT BL RL Tout Tdhw
OT
Tk
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