Viessmann EA1 Quick guide

5443233 GB 3/2020 Dispose after installation.
Installation and service
instructions
for contractors
VIESMANN
EA1 extension
Function extension
Safety instructions
Please follow these safety instructions closely to prevent accidents
and material losses.
Safety instructions explained
Danger
This symbol warns against the
risk of injury.
!Please note
This symbol warns against the
risk of material losses and envi-
ronmental pollution.
Note
Details identified by the word "Note"
contain additional information.
Installation, commissioning, inspection,
maintenance and repairs must only be
carried out by an authorised, competent
person (heating engineer/installation
contractor).
Before working on the appliance/heat-
ing system, isolate it from the power
supply (e.g. by removing a separate
mains fuse or by means of a mains iso-
lator) and safeguard against unauthor-
ised reconnection.
When using gas as fuel, also close the
main gas shut-off valve and safeguard
against unintentional reopening.
Check for gas tightness after installa-
tion.
Wear suitable personal protective
equipment when carrying out any work.
Repairing components that fulfil a
safety function can compromise the
safe operation of the system.
For replacements, use only original
spare parts supplied or approved by
Viessmann.
Install the components with new gas-
kets.

2
Please dispose of packaging waste in
line with statutory regulations.
Disposal of packaging
5443233

3
Sym-
bol
Meaning
Reference to other document
containing further information
1.
Step in a diagram:
The numbers correspond to
the order in which the steps
are carried out.
Warning of material losses and
environmental pollution
Live electrical area
Pay particular attention.
■ Component must audibly
click into place.
or
■ Acoustic signal
■ Fit new component.
or
■ In conjunction with a tool:
Clean the surface.
Dispose of component correct-
ly.
Dispose of component at a
suitable collection point. Do
not dispose of component in
domestic waste.
Symbols
5443233

4
Spare parts lists
Information about spare parts can be
found at www.viessmann.com/etapp
or in the Viessmann spare part app.
Application
Note
In the following, the different Vitotronic
control units are designated as group
A, B or C.
To find out the control unit designation,
please refer to the type plate on the
control unit or heat generator.
Group A
■ Vitotronic 100, type HC1B
■ Vitotronic 100, type HC2B
■ Vitotronic 100, type KC2B
■ Vitotronic 100, type KC4B
■ Vitotronic 100, type GC7B
■ Vitotronic 200, type HO1B
■ Vitotronic 200, type HO1C
■ Vitotronic 200, type KO1B
■ Vitotronic 200, type KO2B
■ Vitotronic 200, type KW6B
■ Vitotronic 200, type HO1D
■ Vitotronic 200, type HO2B
■ Vitotronic 200, type GW7B
Group B
■ Vitotronic 100, type GC1B
■ Vitotronic 100, type GC4B
■ Vitotronic 200, type GW1B
■ Vitotronic 200-H, type HK1B
■ Vitotronic 200-H, type HK3B
■ Vitotronic 300, type GW2B
■ Vitotronic 300, type GW4B
■ Vitotronic 300-K, type MW1B
■ Vitotronic 300-K, type MW2B
Group C
■ Vitotronic 200, type WO1C
Group D
■ Vitotronic 100, type CC1E, CC1I
■ Vitotronic 200, type CO1E, CO1I
■ Vitotronic 300, type CM1E, CM1I
Symbols (cont.)
5443233

5
1.
2.
Overview of electrical connections
aVG
A
LNL
N
fÖ
SP
aBJ
Ö
[{S
DE [{{]
0-10V f-]
A
[{A
DE [{D DE
+ -5 61 2 1 2 3 4
AEA1 extension
DE1 Digital input 1
DE2 Digital input 2
DE3 Digital input 3
0 - 10 V 0 - 10 V input
fÖ Power supply
fÖ A Power supply for additional
accessories
aBJ Central fault message facility/
feed pump/DHW circulation
pump (floating switching con-
tact)
aVG KM-BUS to the control unit
Wall mounting
5443233

6
!Please note
Electronic assemblies can be
damaged by electrostatic loads.
Before beginning work, touch
earthed objects, such as heating
or water pipes, to discharge
static loads.
Note
Apply strain relief to on-site cables.
Seal any unnecessary apertures with
cable grommets (not cut open).
Connecting digital inputs (groups A and B)
The following functions can alterna-
tively be connected:
■ External operating program change-
over for each heating circuit
■ External blocking
■ External blocking with central fault
message input
■ External demand with set flow tem-
perature
■ Central fault message
■ Brief operation of the DHW circula-
tion pump
This function is enabled when the input
is closed.
External contacts must be potential-
free. When connecting external con-
tacts, observe the requirements of pro-
tection class II, i.e. 8.0 mm air and
creep path or 2.0 mm insulation thick-
ness to live parts.
Function assignment of inputs DE1 to DE3
Select the input functions by means of
the codes on the heat generator control
unit:
Digital input Control unit coding address
Group A Group B
DE1 3A 5d
DE2 3b 5E
DE3 3C 5F
Depending on the function and the digi-
tal input selected for it, set the following
codes at the Vitotronic control unit:
Overview of electrical connections (cont.)
5443233

7
Function Setting at relevant coding ad-
dress
No function 0
Operating program changeover 1
External demand with set flow temperature 2
External blocking 3
External blocking with fault message input 4
Fault message input 5
Brief operation, DHW circulation pump 6
Complete description of the coding
addresses:
Control unit or heat generator
installation and service instruc-
tions
Assigning the operating program
changeover function to the heating
circuits
Assign the operating program change-
over function for the relevant heating
circuit via coding address d8 at the con-
trol unit:
■ Changeover via input DE1:
Code d8:1
■ Changeover via input DE2:
Code d8:2
■ Changeover via input DE3:
Code d8:3
■ Select the effect of the operating pro-
gram changeover via coding
address d5.
■ Set the duration of the changeover
via coding address F2.
Effect of the "External blocking"
function on the pumps (group A)
■ Select the effect on the internal boiler
circulation pump (Vitotronic, type
HC1B, HC2B, HO1B and HO1C) in
coding address 3E.
■ Select the effect on the relevant heat-
ing circuit pump in coding
address d6.
■ Select the effect on the circulation
pump for cylinder heating (Vitotronic,
group A) in coding address 5E.
Effect of the "External demand"
function on the pumps (group A)
■ Select the effect on the internal boiler
circulation pump (Vitotronic, type
HC1B, HC2B, HO1B and HO1C) in
coding address 3F.
■ Select the effect on the relevant heat-
ing circuit pump in coding
address d7.
■ Select the effect on the circulation
pump for cylinder heating (Vitotronic,
group A) in coding address 5F.
Connecting digital inputs (groups A and B) (cont.)
5443233

8
Set flow temperature for external
demand
■ Select the set flow temperature in
coding address 9b.
Connecting digital inputs (group C)
Function assignment of inputs DE1 to DE3
Input functions are permanently
assigned for the Vitotronic 200, type
WO1C. See the following table:
Input Function
DE1 Swimming pool heating de-
mand
DE2 External blocking
DE3 External demand/external
changeover of operating
status
External contacts must be potential-
free. When connecting external con-
tacts, observe the requirements of pro-
tection class II, i.e. 8.0 mm air and
creep path or 2.0 mm insulation thick-
ness to live parts.
Further details:
Vitotronic 200, type WO1C serv-
ice instructions
Connecting digital inputs (group D)
The following functions can alterna-
tively be connected:
■ External operating program change-
over for each heating circuit
■ External blocking
■ External blocking with central fault
message input
■ External demand with set flow tem-
perature
■ Central fault message
■ Brief operation of the DHW circula-
tion pump
This function is enabled when the input
is closed.
External contacts must be potential-
free. When connecting external con-
tacts, observe the requirements of pro-
tection class II, i.e. 8.0 mm air and
creep path or 2.0 mm insulation thick-
ness to live parts.
Connecting digital inputs (groups A and B) (cont.)
5443233

9
Function assignment of inputs DE1 to DE3
Select the input functions by means of
the parameter settings on the heat gen-
erator control unit:
Digital input Control unit parameters (General
group)
DE1 42
DE2 43
DE3 44
Depending on the function and the digi-
tal input selected for it, set the following
parameters at the Vitotronic control
unit:
Function Settings at parameters 42, 43,
44 (General group)
No function 0
Operating program changeover 1
External demand with set flow temperature 2
External blocking 3
External blocking with fault message input 4
Fault message input 5
Brief operation, DHW circulation pump 6
Complete description of the parame-
ters:
Control unit or heat generator
installation and service instruc-
tions
Assigning the operating program
changeover function to the heating
circuits
Select assignment of the operating pro-
gram changeover function for the rele-
vant heating circuit via parameter 20
(Heating circuit group) at the control
unit:
■ Changeover via input DE1: Parame-
ter 20:1
■ Changeover via input DE2: Parame-
ter 20:2
■ Changeover via input DE3: Parame-
ter 20:3
Connecting digital inputs (group D) (cont.)
5443233

10
■ Select the effect of the operating pro-
gram changeover via parameter 1F
(Heating circuit group).
■ Set the duration of the changeover
via parameter 24 (Heating circuit
group).
Set flow temperature for external
demand
■ Select the set flow temperature in
parameter 0B (General group).
Connecting a circulation pump or a fault message facility
Connection aBJ is floating.
The following components can be con-
nected to plug aBJ:
Groups A, B and D:
■ Feed pump to substation
or
■ DHW circulation pump
or
■ Fault message facility
? ?
fÖaBJ
230 V~
f-]
A
M
1~
A
ACirculation pump or fault message
facility 230 V
Connecting digital inputs (group D) (cont.)
5443233

11
Operating the heating circuit pump at low speed (night contact)
LNL
N
fÖ
SP
aBJ
Ö
f-]
A
LN
N PE
L
D
C
A
B
ACirculation pump
BNight contact input
CContactor
DSeparate power supply
In reduced mode, the connected heat-
ing circuit pump is operated at low
speed. The circulation pump must have
a switching input.
Select the function:
■ Group B: Coding address 5C:3/4/5
■ Group D: Parameter 41:3/4/5 (Gen-
eral group)
Connecting a circulation pump or a fault… (cont.)
5443233

12
Group C:
■ Circulation pump for swimming pool
heating
L1N
M
1~
CD
A
B
LNL
N
fÖ
SP
aBJ
Ö
f-]
A
ACirculation pump for swimming
pool heating (accessories)
B3-way diverter valve "swimming
pool" (zero volt: Charging the heat-
ing water buffer cylinder)
CJunction box (on site)
DFuse and contactor for circulation
pump for swimming pool heating
(accessories)
Rated voltage: 230 V~
Rated current (max): 2 (1) A~
Recommended connecting cable: H05VV-F3G 0.75 mm2
or
H05RN-F3G 0.75 mm2
Function assignment
Select the function of output aBJ:
■ Group A: Coding address 36
■ Group B: Coding address 5C
■ Group C: Parameter 7010
■ Group D: Parameter 41 (General
group)
Feed pump
Demand from a heating circuit control
unit connected via LON starts the feed
pump.
Connecting a circulation pump or a fault… (cont.)
5443233

13
If EA1 extension is connected to the
heating circuit control unit, the feed
pump is started directly.
DHW circulation pump
Brief operation: The DHW circulation
pump starts when there is a demand
from the digital input D1 to D3 selected
for this function.
Set the runtime:
■ Group A: Coding address 3d
■ Group B: Coding address 12
■ Group D: Parameter 47 (General
group)
Operation according to time program:
The DHW circulation pump starts at the
selected switching times.
Information on DHW circulation
pumps
Connect DHW circulation pumps with
standalone functions directly to the
230 V ∼ supply.
Fault message facility
If a digital input is used as fault mes-
sage input, the connected fault mes-
sage facility is switched on when a fault
occurs.
Installation and service instruc-
tions
If the relay of output aBJ is switched,
contact P-Ö is opened.
Contact P-Ö closes if a fault occurs at
EA1 extension or the communication is
interrupted.
Note
If a fault message facility is connected,
this will be activated briefly when the
system starts.
Connecting a circulation pump or a fault… (cont.)
5443233

14
U
+
LNL
N
fÖ
SP
aBJ
Ö
[{{]
0-10V f-]
A
+ -
Ensure correct polarity of the DC con-
trol voltage 0 - 10 V.
Note
Ensure galvanic separation between
the earth conductor and the negative
pole of the on-site power source.
Groups A and B
Cannot be used with Vitotronic 200-H,
type HK1B, HK3B
The 0 - 10 V hook-up provides an addi-
tional set value:
0 - 1 V is seen as "no specification for
set value".
1 V ≙ set value 10 ºC
10 V ≙ set value 100 ºC
On the Vitotronic, type G ... and type
K ... the range of the set value specifi-
cation can be changed in coding
address 1E:
1 V ≙ set value 30 ºC
10 V ≙ set value 120 ºC
Further details:
Installation and service instruc-
tions
Group D
The following functions can be
assigned to the 0 to 10 V input via
parameter "45" in the "General" group:
■ Temperature demand
■ Output demand
Temperature demand
The 0 to 10 V hook-up provides an
additional set boiler water temperature.
Connecting the analogue input 0 - 10 V
5443233

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This function is activated via parameter
"45:00".
0 – 1 V "No specification for set boiler
water temperature"
■ Single boiler system: The
boiler runs in control mode.
■ Multi boiler system: The
boiler cools down.
1 V ≙ Set value 10 °C
10 V ≙ Set value 100 °C
Ensure galvanic separation between
the earth conductor and the negative
pole of the on-site power source.
Output demand
The 0 to 10 V hook-up provides a
specified boiler output:
■Function activated via parameter
"45:01":
If the boiler receives a higher set out-
put value through other requirements,
it is operated at this output.
■Function activated via parameter
"45:02":
The boiler is operated at the specified
output. Only the boiler protection
function (Therm-Control) is taken into
account universally.
0 – 1 V "No specification for boiler out-
put"
■ Single boiler system: The
boiler runs in control mode.
■ Multi boiler system: The
boiler cools down.
1 V ≙ set value 10 %
10 V ≙ set value 100 %
Connecting the KM-BUS to the heat generator control unit
Note
The KM-BUS can be connected to the
control unit in the following ways.
If the connection takes the form of
screw terminals, remove plug aVG from
the cable supplied. The cores are
interchangeable.
Installation and service instruc-
tions
Connecting the analogue input 0 - 10 V (cont.)
5443233

16
B
3 2 17 6 5 4
X3X4 C
145
1 2
D
2 1 54321
X3X4 aVG
X14
aVG
A
[{S
DE [{{]
0-10V
[{A
DE [{D DE
+ -5 61 2 1 2 3 4
AEA1 extension
B■ Vitotronic control unit with
plug aVG
■ or
KM-BUS distributor
CVitotronic control unit with screw
terminals for KM-BUS connection
DWall mounted gas condensing boil-
ers and storage combi boilers with
plug aVG
Connecting the KM-BUS to the heat generator… (cont.)
5443233

17
Power supply to the heat generator control unit or additional
accessories
Possible designation of the power sup-
ply concerned:
■fÖ A
■lH
■aBH
Danger
Incorrect core assignment can
result in serious injury and dam-
age to the appliance.
Never interchange cores "L" and
"N".
Power supply (groups A, B and D)
B230 V~
N L1
PE
A
LNL
N
fÖ
SP
aBJ
Ö
f-]
A
AEA1 extension
BHeat generator control unit or other
accessory
Power supply
5443233

18
Power supply (group C)
L?NL
?
N
fÖ
SP
aBJ
Ö
f-]
A
A
B
X1X2.N X3.1/
X3.2/
X3.3
?
AEA1 extension BVitotronic 200, type WO1C
Power supply and KM BUS connection of accessories
Danger
Incorrectly executed electrical
installations can result in injuries
from electrical current and dam-
age to the appliance.
■ Route extra low voltage (ELV)
leads < 42 V and
> 42 V/230 V~ cables sepa-
rately.
■ Strip as little of the insulation
is possible, directly before the
terminals, and bundle tightly
to the corresponding termi-
nals.
■ Secure cables with cable ties.
Power supply (cont.)
5443233

19
Power supply to all accessories via heat source control unit
fÖ fÖ
B C
aVG fÖ lH
A D
E
aVG aVG f-]
A
aVG aVG f-]
A
fÖ aVG aVG f-]
A
Some accessories with direct power supply
B CA D
E
fÖ fÖ aVG fÖ lH aVG aVG f-]
A
aVG aVG f-]
A
fÖ aVG aVG f-]
A
AHeat source control unit
BExtension kit for heating circuit
with mixer M2
CExtension kit for heating circuit
with mixer M3
DAM1 extension, EA1 extension
and/or solar control module, type
SM1
EON/OFF switch
fÖ Mains input
fÖAPower outlet
lH Control unit power outlet
aVG KM BUS connection
If the current flowing to the connected
working parts (e.g. circulation pumps) is
higher than the fuse rating of the
respective accessory: Only use the out-
put concerned to control an on-site
relay.
Accessories Internal fuse
protection
Extension kit for
heating circuit with
mixer
2 A
AM1 extension 4 A
EA1 extension 2 A
Solar control module,
type SM1
2 A
Power supply (cont.)
5443233

20
Direct power supply
Danger
Incorrectly executed electrical
installations can result in injuries
from electrical current and dam-
age to the appliance.
Connect the power supply (see
page 5) and implement all earth-
ing measures (e.g. RCD circuit)
in accordance with the following
regulations:
■ IEC 60364-4-41
■ VDE regulations
■ Connection requirements
specified by your local power
supply utility
■ Protect the power cable on
site with a fuse/MCB of
up to 16 A.
Danger
The absence of system compo-
nent earthing can lead to seri-
ous injury from electric current if
an electrical fault occurs.
The appliance and pipework
must be connected to the equi-
potential bonding of the building.
Isolators for non-earthed conductors
■ The mains isolator (if installed) must
simultaneously isolate all non-
earthed conductors from the mains
with a minimum contact separation
of 3 mm.
■ If no mains isolator is installed, all
non-earthed conductors must be iso-
lated from the power supply by the
upstream circuit breaker with a mini-
mum contact separation of 3 mm.
Danger
Incorrect core assignment can
result in serious injury and dam-
age to the appliance.
Never interchange cores "L" and
"N".
!Please note
Incorrect phase sequence can
cause damage to the appliance.
Ensure phase equality with the
control unit mains connection.
? ?
fÖf-]
A
230V~
B
L1
N
aBJ
AEA1 extension
BMains isolator (if required)
Power supply (cont.)
5443233