Viessmann EM-EA1 Installation And Service Instructions For Contractors page 4
Dio electronics module function extension
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Electrical connections
Function
External demand (digital)
If 230 V voltage is present at digi-
tal input contact Z1-1, a demand is
sent to the heat generator with an
adjustable set flow temperature
(parameter 528.0) and a set
speed for the primary circuit pump
(parameter 1100.2).
External enable
If 230 V voltage is present at digi-
tal input contact Z1-1, the heat
generator will be blocked. Mes-
sage info I.57 is displayed.
!
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 the extractor hood/extractor to output
hH
Z1
1
?
L
?
M
N
1~
Fig. 4
4
(cont.)
Connections
DI1
DI2
f-]
fÖ
A
?
?
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~
hH
0 - 10 V
66
Z1-1
OUT
IN
230 V
X
X
Z1-L
OUT
230 V
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