The RCMU is an encapsulated microprocessor-based, intelligent, self-monitoring control unit split into four groups, A to D, for connecting up to 2 dampers and 2 detectors in each group.
The RCMU8 can either act as an independent control unit and perform automatic function tests every 48 hours after power up/resetting or it can be connected in a network to a minimaster RCMM for centralised registration, control and monitoring. RCMU8-MOD is used to connect to Modbus. Function tests can also be initiated by an external switch. During the test, damper groups A+B are tested first then C+D. The RCMU has electronic circuits that automatically connect outputs with connected damper actuators.
By setting a microswitch, a so-called DIP switch, you can determine the effect of the smoke detectors as follows:
- The four detector groups A-D only affect their corresponding damper group.
- Groups A and B work together as a single group and close the corresponding damper groups, regardless of which detector in groups A and B was triggered, while the detectors in group C and group D only affect their corresponding damper group respectively.
- Groups C and D work together as a single group and close the corresponding damper groups, regardless of which detector in groups C and D was triggered, while the detectors in group A and group B only affect their corresponding damper group respectively.
- All groups work together and all dampers close, regardless of the triggered detector.
The detector outputs feature an electronic short circuit fuse. All connected dampers enter the alarm position in the event of a short circuit or a break in one of the detector loops. The RCMU can even be made to enter alarm operation mode for the A+B group and the C+D group via an external incoming alarm.