Viessmann EM-EA1 Installation And Service Instructions For Contractors page 3

Electrical connections
Function
230 V fault message input and
fault message output (potential-
free) without system blocking
Fault message input: If 230 V volt-
age is present at digital input con-
tact Z1-1, fault message is active.
Fault message output 66 active.
External LPG valve
Output Z1-L is active if the burner
control unit opens the external
LPG valve.
Extractor hood: External extrac-
tor interlock
An extractor can be switched off.
Output 66 switches from Ö to S
and thereby switches the extractor
hood off when the burner control
unit starts the burner.
Changing operating modes
Demand to all available heating
circuits simultaneously, as long as
contact remains closed. With the
relevant selected set room tem-
perature of the individual heating
circuit:
DI1 Reduced room temperature
DI2 Standard room temperature
DI3 Comfort room temperature
Fault message input 24 V and
system blocking, e.g. conden-
sate removal pump
If contact DI1 is closed, the heat
generator is blocked. Output 66 is
switched over. Fault message F.
104 appears. E.g. block burner, if
fault is present at condensate re-
moval pump.
Note
If only the fault message output is
to be used, e.g. setting the "fault
message input... and fault mes-
sage output" functions.
Fault message input 230 V and
system blocking
If 230 V voltage is present at digi-
tal input contact Z1-1, the heat
generator is blocked. Output 66 is
switched over. Fault message F.
104 appears.
(cont.)
Connections
DI1 DI2 DI3
X X X
X
PWM1 0 - 10 V 0 - 10 V
IN OUT
66 Z1-1 Z1-L
IN OUT
230 V 230 V
X X
X
X
X
X X
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