© KWB – Kraft und Wärme aus Biomasse GmbH
IM Easyfire 10/2008
Page
35
2 System installation
2 System installation
A maximum of 2 dig. 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 nodes. The
cabling is executed as is usual for analogue room sensors, i.e. directly to the boiler I/O module or to the HCM
(because there are no bus stations!).
2.1.11.5 Control units & heating circuit expansion modules (HCM)
All control units and heating circuit modules (HCM) are manufactured in a 2-shell enclosure design made of plastic.
A screw-less locking mechanism for the enclosure parts enables easy and fast unlocking. The undershell serves
as a wall or install base, and is fitted with one or two RIA block terminals where the cabling must be connected as
specified in the connection diagram (section 17). The upper shell bears the control elements in the front and bears
the electronics in the rear with pin connectors. When the two shells are joined together the electrical connection
to the block terminals is established.
To prevent damage to the enclosure or to the pin connectors, the instructions in this
manual must be strictly followed! Room control units with room sensor influence should
be not mounted, installed, or integrated in-wall. Only install room control units with
room sensor influence free on-wall.
2.1.11.5.1 Boiler control unit / digital room control unit (OPTION)
With the digital room control unit, operating and monitoring functions of the heat distribution and dissipation system
(with the boiler control unit, operating and monitoring functions of the boiler as well) can be located in the living
room. The mounting location, if room sensor influence is used, should be in the main room on an inside wall, but
not in the vicinity of heating elements or other heating devices, and not on doors or windows. For installation or
connection of the dig. room control unit or of the boiler control unit (only when used as dig. room control unit), the
plastic enclosure must be opened as described below.
• Carefully guide a flat-head screwdriver (width = 4 mm) into the slot
provided for this purpose on the upper long side of the enclosure
division.
• Carefully press the screwdriver in the direction shown.
• Go to the other long side and repeat the previously described process
in the same manner.
Open the control unit 1
Pull the upper half of the enclosure out of the undershell. In this process
ensure that the parts do not tilt.
Open the control unit 2
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30.03.2009 13:30:03 Uhr
