External Extensions (Accessories); Em-Ea1 Extension; Control Functions; Venting Program - Viessmann Vitovalor PT2 E11T Installation And Service Instructions Manual

External extensions (accessories)

EM-EA1 extension

Fig. 117
DI1 Digital input 1
DI2 Digital input 2
(no function)
DI3 Digital input 3 (no function)
0 - 10 V IN 0 - 10 V input (no function)
0 - 10 V OUT 0 - 10 V output (no function)
PWM1 Output, control voltage (no function)
Digital data input DI1
When the contact is closed, the gas condensing mod-
ule and fuel cell module are blocked. Fault message
output 66 is activated.
Function: External blocking with fault message
The external contact must be potential-free. When
connecting external contacts, observe the require-
ments of protection class II: 8.0 mm air and creep path
or 2.0 mm insulation thickness to live parts.
Output
hH
A fault message facility can be connected to output
Rated current max. 1 A~

Control functions

Venting program

During the venting program, the circulation pump will
be alternately switched on and off for 30 s over a
period of 20 min.
S1 Rotary switch for subscriber number
Z1 Relay output 230 V with input 230 V
Power supply
fÖ
A Power supply for additional accessories
fÖ
Connection for fault message signalling
hH
equipment (floating switching contact)
jF PlusBus
Relay output Z1
The following functions can be connected:
■ 230 V fault message input (to digital input 1-L on
connector Z1) and system block. When the contact is
closed, the gas condensing module and fuel cell
module are blocked. Fault message output 66 is acti-
vated.
Fault message output (to digital input 1-L on connec-
■
tor Z1). Output 66 is activated.
The functions can be set via the commissioning assis-
tant.
.
hH
The diverter valve alternates between heating and
DHW heating for a given time. The burner is switched
off during the venting program.
Function description
187