Viessmann EM-EA1 extension Operating instructions

5838029 GB 12/2018
Installation and service instructions
for contractors
VIESMANN
EM-EA1 extension
DIO electronics module
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 environmental pollution.
Note
Details identified by the word "Note" contain additional
information.
Installation, initial start-up, inspection, maintenance
and repairs must only be carried out by a competent
person (heating engineer/installation contractor).
Before working on the equipment/heating system, iso-
late the power supply (e.g. by removing a separate
mains fuse or by means of a mains isolator) and safe-
guard against unauthorised reconnection.
When using gas as fuel, also close the main gas shut-
off valve and safeguard against unauthorised reopen-
ing.
Repairing components which fulfil a safety function can
compromise the safe operation of your heating system.
For replacements, use only original spare parts sup-
plied or approved by Viessmann.
Application information
The functions that can be connected depend on the
settings made at the heat generator. See heat genera-
tor service instructions. Only one function can be con-
nected to each EM-EA1 extension (DIO electronics
module).
Up to max. 3 EM-EA1 extensions can be connected to
a heat generator.

2
1.
Fig. 1
Electrical connections
jF jF [{][{][{] hH [{] fÖ
1234123456121212?
1??
fD
K1
S1
Fig. 2
DI1 Digital input 1
DI2 Digital input 2
DI3 Digital input 3
0 - 10 V IN 0 - 10 V input
0 - 10 V OUT 0 - 10 V output
PWM1 Control voltage output
S1 Rotary switch for subscriber number
addressing
Z1 fD 230 V relay output, 230 V input
fÖ Power supply
fÖ A Power supply for additional accessories
hH Changeover contact (floating switching
contact) for connecting signalling equip-
ment for fault messages or an extractor
hood
jF PlusBus
Mounting on the wall
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Function Connections
DI1 DI2 DI3 PWM1 0 - 10 V
IN
0 - 10 V
OUT
66 Z1-1
IN
230 V
Z1-L
OUT
230 V
230 V fault message input and
fault message output (potential-
free) without system blocking
Fault message input: If 230 V volt-
age is present at digital input con-
tact Z1-1, fault message is active.
Fault message output 66 active.
X X
External LPG valve
Output Z1-L is active if the burner
control unit opens the external
LPG valve.
X
Extractor hood: External extrac-
tor interlock
An extractor can be switched off.
Output 66 switches from Ö to S
and thereby switches the extractor
hood off when the burner control
unit starts the burner.
X
Changing operating modes
Demand to all available heating
circuits simultaneously, as long as
contact remains closed. With the
relevant selected set room tem-
perature of the individual heating
circuit:
DI1 Reduced room temperature
DI2 Standard room temperature
DI3 Comfort room temperature
X X X
Fault message input 24 V and
system blocking, e.g. conden-
sate removal pump
If contact DI1 is closed, the heat
generator is blocked. Output 66 is
switched over. Fault message F.
104 appears. E.g. block burner, if
fault is present at condensate re-
moval pump.
Note
If only the fault message output is
to be used, e.g. setting the "fault
message input... and fault mes-
sage output" functions.
X X
Fault message input 230 V and
system blocking
If 230 V voltage is present at digi-
tal input contact Z1-1, the heat
generator is blocked. Output 66 is
switched over. Fault message F.
104 appears.
X X
Electrical connections (cont.)
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Function Connections
DI1 DI2 DI3 PWM1 0 - 10 V
IN
0 - 10 V
OUT
66 Z1-1
IN
230 V
Z1-L
OUT
230 V
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).
X
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.
X
!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.
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).
Connect fault message facility to output hH
? ?
fÖf-]
A
hH Z1
?
1
?
N
L
Fig. 3
Rated current max. 1 A~
Connecting the extractor hood/extractor to output hH
? ?
fÖf-]
A
hH Z1
?
1
?
N
L
1~
M
Fig. 4
Electrical connections (cont.)
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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.
jF jF [{][{][{]
DI1 DI2 DI3
1234123456
Fig. 5
Connecting the LPG valve to plug Z1
[{] fÖ
?
1??
fD
M
1~
Fig. 6
Connection of 230 V input to Z1-1
Fault message input and conductor L of the power
supply at plug fÖ must be identical.
? ?
fÖf-]
A
Z1
?
1
A B
Fig. 7
AFault message facility
BJunction box
Connecting the circulation pump to output hH
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Fig. 8
Set rotary switch S1 to a consecutive number as
shown in the example below:
■1st extension EM-EA1: Rotary switch to 1
■2nd extension EM-EA1: Rotary switch to 2
■3rd extension EM-EA1: Rotary switch to 3
Note
These settings are independent of the settings made
at other extensions, such as EM-MX (mixer). If an EM-
EA1 extension (DIO electronics module) is set to 1, an
EM-MX, EM-M1 or EM-P1 extension (ADIO electronics
module) can also be set to 1.
Configuring functions
Configure the settings of the connected function during
commissioning using the heat generator's commission-
ing assistant.
Heat generator installation and service instruc-
tions
Connecting the PlusBus to the heat generator
B
74
1 2
A
jF jF
1234
Fig. 9
AExtension (electronics module)
BPlusBus to heat generator
Note
If making the connection to the heat generator with an
external plug for the bus connection, disconnect plug
jF and connect the wires directly.
Heat generator installation and service instruc-
tions
Rotary switch S1 for subscriber number addressing
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Power supply at heat generator
L?NL
?
N
156
LN
A
Fig. 10
AExtension (electronics module)
fÖ Power supply
fÖAPower supply for further accessories
aBH Plug for heat generator accessories power supply
Create the power supply connection.
Route the power cable to the heat generator and con-
nect to plug aBH. Observe MCB/fuse protection, out-
put, plug aBH of the heat generator.
If power is supplied to a further accessory, use
plug fÖA provided
Heat generator installation and service instruc-
tions
Danger
Incorrect core assignment can result in serious
injury and damage to the appliance.
Never interchange cores "L" and "N".
Separate power supply
If the power supply for the extension is not made at
the heat generator.
Danger
Incorrect electrical installations can lead to seri-
ous injury from electrical current and result in
appliance damage.
Connect the power supply and implement all
safety measures (e.g. RCD circuit) in accord-
ance with the following regulations:
■IEC 60364-4-41
■VDE regulations
■TAR medium voltage VDE-AR-N-4110
Danger
The absence of system component earthing can
lead to serious injury from electric current if an
electrical fault occurs.
The appliance and pipework must be connected
to the equipotential 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 con-
ductors must be isolated from the power supply by
the upstream circuit breaker with a minimum contact
separation of 3 mm.
Power supply
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L1
B
FE
D
D
N
C
A
40
Fig. 11
APower supply, extension (electronics module)
BPower supply, heat generator
CPower supply 1/N/PE, 230 V/50 Hz
DFuse (max. 16 A)
EMains isolator, 2-pole, on site
FJunction box (on site)
Connect the power supply in accordance with the dia-
gram.
If the power supply to the appliance is connected with
a flexible cable, ensure that the live conductors are
pulled taut before the earth conductor in the event of
strain relief failure. The length of the earth conductor
wire will depend on the design.
Danger
Incorrect core assignment can result in serious
injury and damage 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 heat generator
power supply.
Colour coding to IEC 60757
BN Brown
BU Blue
GNYE Green/yellow
Power supply (cont.)
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Power supply and PlusBus connection
Power supply to all accessories via heat generator control unit
74 74 40A 40 74 74 40A 40
B C
74 40 96/156
A
74 74 40A 40
D
E
Fig. 12
Some accessories with direct power supply
74 74 40A 40 74 74 40A 40
B C
74 40 96/156
A
74 74 40A 40
D
E
Fig. 13
AHeat generator control unit
BMixer extension kit for heating circuit with
mixer M2 (ADIO electronics module)
CMixer extension kit for heating circuit with
mixer M3 (ADIO electronics module)
DFurther accessories
EON/OFF switch
fÖ (A) Power supply
jF PlusBus
lH/aBH Accessories power supply in the control unit of
the heat generator
■In the following circumstances, use the output for the
accessories only to switch an on-site relay:
An actuator (e.g. circulation pump) with a higher
power demand than the fuse rating required for the
accessories is connected at the accessories output.
■In the following circumstances, connect one or more
accessories directly to the mains supply via an
ON/OFF switch:
The max. permissible total current of the control unit
for the heat generator is exceeded.
Note
In this event, the accessories concerned cannot be
isolated with the ON/OFF switch on the control unit.
Connecting several accessories
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Fig. 14
DI1 Digital input 1
DI2 Digital input 2
DI3 Digital input 3
0 - 10 V IN 0 - 10 V input
0 - 10 V OUT 0 - 10 V output
PWM1 Control voltage output
S1 Rotary switch
Z1 230 V relay output, 230 V input
fÖ Power supply
fÖ A Power supply for additional accessories
hH Changeover contact (floating switching
contact) for connecting signalling equip-
ment for fault messages or an extractor
hood
jF PlusBus
Parts list
The following details are required when ordering parts:
■Serial no. (see type plate)
■Position number of the part
Connection and wiring diagram
5838029