2 System installation
• Bus cable: 8-pole shielded, CAT 5e LF-2YACVY 4 × 2 × 0.52 – 100GR, max. length 850 m
• Laid out in a separate conduit (not together with 230 / 400 VAC)
• Network stations in one line (no branches, no ring!)
• When using the BCU in the room you must install the supplied empty wall socket.
• A maximum of 2 digital room control units (DRCU) can be jointly supplied with power (24 VDC) from one HCM
or the boiler I/O module. The supply should not be further terminated.
However the bus cable must be consistently looped through.
• The network can be extended with a boiler I/O module (2 heating circuits) with up to 16 heating circuit expansion
modules (two heating circuits each), and 34 digital room control units.
• For each heating circuit, an analogue room control unit (ARCU), can be used independent of the bus stations.
The cabling is executed as is usual for analogue room sensors, i.e. it is routed directly to the boiler I/O module
or to the HCM (because there are no bus stations!).
The total length of the bus lines should not exceed 850 m and must always be wired
in series (in a row). The relative position of the houses can be freely selected.
(Fig. 2 Cabling, network)
Execution example with one terminal point:
Type CAT 5e LF-2YACVY
4 × 2 × 0.52 – 100GR
1. – Insulate the wires (with shrink hose) 4. – Connect the wires (through twisting)
2. – Strain relief (with a cable tie) 5. – Terminate the shielding (with cable clamp)
3. – Mark the cables coming / going
(e.g. with arrows)
Terminals of the bus cable
Bus cable: 8 pole, shielded, CAT 5e LF-2YACVY 4 × 2 × 0.52-100GR, max. length 850 m
Laid out in a separate conduit (not together with 230 / 400 VAC).
Network stations in one line (no branches, no ring!)
When using the BCU in the room you must install the supplied empty wall socket.
MA-Easyfire 10.2008_EN.indd 34MA-Easyfire 10.2008_EN.indd 34 30.03.2009 13:30:02 Uhr30.03.2009 13:30:02 Uhr
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