Bedienungsanleitung Wodtke Family.nrg (Seite 23 von 68) (Englisch)

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Manual_S5_Airplus_2015_04_20 Page 23 / 68

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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