Safety Contact; Connection Of A Remote Alarm Transfer And Boiler Operation Indication System (Not Proposed) - DeDietrich MCR 24 Technical Instructions

6 Safety contact

: Existing bridge
: Safety contact

7 Connection of a remote alarm transfer and boiler operation indication system (Not proposed)

The boiler is equipped with a 3 pin connector without power on
terminal block X7. The terminal block can be used to connect to an
external gas valve, a remote alarm transfer and boiler operation
indication system.
- Connect the alarm transfer system to pins 1 and 2 of terminal block
X7. Contact is closed in the event of a shutdown.
To do so: Set parameter 24 to 1.
- Connect the boiler operation indication system to pins 1 and 3 of
terminal block X7. If heating is required, the boiler thermostat
closes the contact.
To do so: Set parameter 24 to 2.
- Connect an external gas valve to pins 1 and 3 of terminal block X7.
The contact is closed when the gas valve is activated.
To do so: Set parameter 24 to 3.
32
MCR boilers are equipped with a security switch. A voltage-free
switching device (e.g. an external gas pressure switch or a safety
thermostat for underfloor heating) can be connected to connectors 5
and 6 on terminal X9 after disconnecting all of the cables. When the
contact is open, the boiler turns off indicating code 9; it will start again
once the contact is closed.
: Common alarm (Contact closed)
: Boiler in use (Contact open)
MCR 24, 24/28 MI, 30/35 MI, 34/39 MI 08/06/06-300008460-001-B