Viessmann EM-EA1 Installation And Service Instructions For Contractors page 4

Electrical connections
Function
External demand (digital)
If contact Z1-1 Z1-L is closed, a
–
demand is sent to the heat gener-
ator according to an adjustable set
flow temperature (parameter
528.0).
External blocking
If contact Z1-1 Z1-L is closed,
–
the heat generator is blocked.
!
Please note
Electronic assemblies can be damaged by static
loads.
Before beginning work, touch an earthed object
such as heating or water pipes to discharge any
static.
Connect fault message facility to output
hH Z1
1
?
L
?
N
Fig. 3
Connecting a floating switching contact to digital inputs DI1 to DI3
jF jF [{] DI1 DI2 DI3 [{] [{]
1 2 3 4 1 2 3 4 5 6
Fig. 4
4
(cont.)
Connections
DI1 DI2
f-] fÖ
A
? ?
DI3 PWM1 0 - 10 V
IN
Note
Apply strain relief to on-site cables.
Secure individual wires directly to each plug using
cable ties.
Blank off unnecessary knockouts with cable grommets
(not cut out).
hH
Rated current max. 1 A~
0 - 10 V 66 Z1-1
OUT IN
230 V
X
X
Z1-L
OUT
230 V
X
X