Electrical Connections - Viessmann EM-EA1 Installation And Service Instructions Manual

Installation sequence
Overview of electrical connections
Function
External functions
External set flow temperature
■
0 to 10 V
External set value for heat generator
■
modulation 0 to 10 V
Operating mode changeover
■
External heating circuit hook-up
■
External demand
■
External blocking
■
Fault message input and fault mes-
sage output
Fault message input 230 V (without
■
system blocking)
Fault message input 230 V and sys-
■
tem blocking
Fault message input 24 V and system
■
blocking
Connecting only message facility (e.g.
■
buzzer)
LPG valve (external)
Extractor hood (external extractor in-
terlock)

Electrical connections

!
Please note
Electronic assemblies can be damaged by elec-
trostatic discharge.
Prior to commencing any work, touch earthed
objects such as heating or water pipes to dis-
charge static loads.
■ Apply strain relief to on-site cables.
■ Seal any unnecessary apertures with cable grom-
mets (not cut open).
10
(cont.)
Page Connections:
DI1 DI2 DI3
11
11
12 X X X
12 X X X
13
13
14
14
15 X
15
16
16
Danger
Incorrect wiring can lead to serious injury from
electrical current and result in appliance dam-
age.
Take the following measures to prevent wires
drifting into the adjacent voltage area:
■ Route extra low voltage (ELV) leads < 42 V
separately from cables
Secure with cable ties.
Strip as little of the insulation as possible,
■
directly before the terminals. Bundle the
cables close to the corresponding terminals.
■ If 2 components are connected to the same
terminal, press both cores together in a single
wire ferrule.
■ When connecting external switching contacts
and on-site components, observe the insula-
tion requirements of IEC/EN 60335-1.
PWM1 0 - 10 V
hH
IN OUT
X
X
X
X
X
X
X
42 V/230 V~/400 V~.
>
fD
43-1 43-L
X
X
X
X
X
X
X