Connecting The Plusbus To The Heat Generator; Power Supply; Power Supply At Heat Generator; Separate Power Supply - Viessmann EM-EA1 extension Installation And Service Instructions Manual

Installation sequence
Connecting the external extractor interlock:
The floating contact switches from "Ö" to "S" as soon
as the burner control unit starts the burner. The extrac-
tor is switched off.

Connecting the PlusBus to the heat generator

A
jF jF
1 2 3 4
Fig. 14
Extension (electronics module)
A
PlusBus to heat generator
B

Power supply

Power supply at heat generator

A
L L
N N
? ?
N L
156
Fig. 15
Extension (electronics module)
A
Power supply
fÖ
A Power supply for further accessories
fÖ
Plug for heat generator accessories power supply
aBH

Separate power supply

If the power supply for the extension is not made at
the heat generator.
14
B
hH
(cont.)
Note
If making the connection to the heat generator with an
external plug for the bus connection, disconnect plug
jF and connect the wires directly.
Heat generator installation and service instruc-
tions
Create the power supply connection.
Route the power cable to the heat generator. Connect
to plug . Observe fuse protection at output, plug
aBH
aBH of the heat generator.
If the power supply connection is made to another
accessory, use plug A provided.
fÖ
Heat generator installation and service instruc-
tions
Danger
Incorrect core assignment can result in serious
injury and damage to the appliance.
Never interchange cores "L" and "N".
Power supply for several accessories
Several EM-EA1 function extensions (DIO electronics
module) or other accessories can be connected to the
heat generator.
Heat generator installation and service instruc-
tions