Manual_S5_Airplus_2015_04_20
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©
Wodtke GmbH - Tübingen. All Rights and Changes Reserved.Printed 04/2015
Part No. 950 976
8.3.3
"RS 485" Input (external BUS com-
munication) - Display Indicator HE
RS 485 - BUS input for activation/deactivation and
for modulation of furnace output via an external
heating controller equipped with compatible bus
communication (accessory). The "Bus" input must
first be switched active for use.
Fig. 37: RS 485 input
Priorities:
I/O button has first priority, MIN/MAX (external),
ON/OFF (external), R.M (internal) have priority
over bus. If the bus input is switched active, the
furnace no longer responds to the modulation in-
terface (modulation is automatically deactivated
as soon as BUS is activated) or to modulation
mode/time switch mode via BB-S5 (TC1).
Notice:
a corresponding controller must be connected to
the "RS 485" input after activation, because other-
wise the furnace will go to "Bu ER1" and "HE OFF"
errors.
Activation of the RS 485 input: Only permitted for
specialist companies! Proceed as follows:
Press
button 1 x
change to menu level 1
Now hold
+
+
buttons simultane-
ously for at least 3 seconds until "S" appears in the
display
change to menu level 2
Now hold
or
buttons pressed until "Bu
OFF" indicator appears in the display.
Now press
+
buttons simultaneously un-
til "Bu ON" indicator appears in the display
the
"RS 485" input (bus communication) is now
switched active.
Press
button for at least 3 seconds
return
to operating level
Currently, only the Paradigma Systa-Comfort is
available as a compatible bus controller acces-
sory. Please contact your designated dealer for
further information and finally observe the instruc-
tions included with the Systa-Comfort controller. In
order to connect the Systa-Comfort, a so-called
gateway must be switched between the controller
and the furnace board. See image below for instal-
lation location on the furnace:
1. Gateway (installation location Tmax < 50 °C)
bottom, rear furnace wall
2. Cable for furnace control (PG cable gland)
3. From external controller
Fig. 38: gateway position
Behaviour in case of disrupted BUS communi-
cation (Bu Er1)
If there is no communication between the main
board and the external controller via the bus for a
certain period of time, "HE OFF / G OFF" (normal
shutdown/burnout 15 minutes) alternates blinking
with "BU Er1." The furnace shuts off because the
bus communication has been disrupted (classifi-
cation as error class 2).
The "BuEr1" error is archived in the error memory
of the furnace. An automatic reset + restart occurs
as soon as the BUS functions again (without ac-
tively required intervention by the user, error is ar-
chived in furnace memory, however). The furnace
can only be manually started when there is a com-
munication disruption of the BUS ("HE OFF" / "Bu
Er1" state) if the BUS is deactivated first (see
above).
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