Viessmann EM-EA1 Installation And Service Instructions For Contractors page 5

Connecting the circulation pump to output
Connect high efficiency pumps via a contactor, rather
than directly.
Connecting a floating switching contact to digital inputs DI1 to DI3
This function is enabled when the input is closed.
External contacts must be floating. When connecting
external contacts, observe the requirements of safety
category II, i.e. 5.0 mm air and creep path or 2.0 mm
insulation thickness to live parts.
Connecting the LPG valve to plug Z1
[{] fÖ
fD
1
?
? ?
M
1~
Fig. 6
Connection of 230 V input to Z1-1
Fault message input and conductor L of the power
supply at plug must be identical.
fÖ
hH
jF jF [{] DI1 DI2 DI3 [{] [{]
1 2 3 4 1 2 3 4 5 6
Fig. 5
Z1 f-] fÖ
A
1
? ?
A
Fig. 7
Fault message facility
A
Junction box
B
?
B
5