Cnt 6 Wire Adaptor; Fitting The Cnt Connector; Remote Indication Relays - Mitsubishi Heavy Industries SRK-ZSP-S Service Support Handbook

For remotely starting, stopping and monitoring the unit state.
6 Wire Adapter Kit for MHI Indoor Units.
Installation Guide.
This kit provides the wiring connection to the indoor unit printed circuit board (PCB) or an SC-BIKN-E interface to allow remote
start/stop control and basic status monitoring.

Fitting the CnT connector.

Isolate power supply to the indoor unit.
Remove indoor unit electrical panel cover (FD models) or SC-BIKN-E interface cover (SR models).
Locate the blue socket marked CnT on the exposed P.C.B.
Plug the 635566 wiring harness into the CnT socket.
Run the cables so that the terminal block is located in a convenient position outside the control panel.
Connecting Remote Start/Stop, Shown as XR5 on the Diagram
The unit can be controlled by a volt free switch or relay contact (default). If the unit is left in its factory set condition the unit
will operate as follows :-
When the volt free contact closes between terminal 1 (Red) & 6 (Orange) the unit will start, regardless of whether it was
running or not, (if the unit was already running, it will continue to run).
When the contact opens the unit will stop, regardless of whether it was running or not prior to the switch opening.

Remote Indication Relays.

The relays must have 12Volt D.C. coils. The contacts must be rated for the application for which they are being used. For
typical low current switching the following relay may be suitable:-
Supplier:
Relay Part. No.: 121-8074
The unit will provide the following outputs:-
Indoor unit operating / Heating mode (not on cooling only units) / Compressor on / Common alarm.
One relay is required for each output.
Determine the number of relays that are required and mount them in a suitable location, as close to the unit as is practical
(max. 1.5m).
Link all the positive terminals (A1) of the relay/s together and connect to terminal 1 (Red) on the CnT connection.
Connect the negative terminals (A2) of the relays to the terminal you require.
The terminal functions are as follows:
Indoor unit operating:
Heating mode:
Compressor run:
Common Alarm:

CNT 6 Wire Adaptor

RS Components.
Connect to the wire no. 2 (Black)
Connect to the wire no. 3 (Yellow)
Connect to the wire no. 4 (Blue)
Connect to the wire no. 5 (Brown)
Shown as XR1 on the Diagram.
Shown as XR2 on the Diagram.
Shown as XR3 on the Diagram.
Shown as XR4 on the Diagram.