Addressable unit MHY 419 is an element in Fire Detection and Fire Alarm System Lites, that allows connection of conventional (non-addressable) smoke detectors to an addressable system Lites with C.I.E. MHU 109, MHU 110/111, MHU 115 and MHU 116/117.
Addressable unit connects to a detection line. Address can be set by addressing preparation MHY 535. One or more conventional smoke detectors can be connected to the addressable unit
and they reports to the C.I.E. under the address of the element. During operation the unit is not operated. Normal state is not signalled. Built-in red LED blinks during the alarm state. If the
connected detectors are in explosive area, they have to be connected through separating unit MHY 945.
Note: Since 2/2006 The MHY 945 is being sold only as a spare part.
| Technical parameters | |
| Power supply | (18 to 21) Vimp |
| Rated voltage | 20 Vimp |
| Optical signalling | red LED |
| Connectable parallel signalling | MHS 409, MHS 408, MHS 407 |
| Number of connectable conventional detectors | max. 10 |
| Total standby consumption of connected detectors | max. 1 mA |
| Number of repeated restarts | 0 ÷ 3 |
| Fully loaded line resistance | |
| C.I.E.–addressable unit | max. 50 Ω |
| Loop with conventional detectors | max. 50 Ω |
| Address range | 1 – 128 |
| Parallel signalling line resistance | max. 100 Ω |
| Protection according to ČSN EN 60529 | IP 40 |
| Radio screening degree according to ČSN EN 55022 | B-class equipment |
| Cross-section of connectable wires | (0,2 až 1,5) mm² |
| Dimensions (w × h × d) | (81 × 81 × 24) mm |
| Weight | cca 85 g |
Product is intended for operation with safe equipment in sense of ČSN EN 60950.
| Working conditions | |
| Application of the addressable unit is in areas protected against weather conditions with classification according to ČSN EN 60721-3-3. | |
| K: climatic conditions for environment | 3K5 |
| working temperature range | (-25 to +70) °C |
| max. relative humidity | max. 95 % at +40 °C |
| without condensation and ice accretion | (86 až 106) kPa |
| Z: special conditions | 3Z1 heat radiation negligible |
| B: biological conditions | 3B1 without presence of flora and fauna |
| C: chemical active substances | 3C2 |
| S: mechanical active substances | 3S1 |
| Duration of significant temperature (45°C ÷ 70°C) | 2 months/year |
| Duration of significant humidity (85 % ÷ 95 % / ≤ 40°C) | 100 hours/year |
