Viessmann EM-EA1 extension Quick guide

Please file in Service Binder
5472 514 - 02 03/2022
EM -EA1 Ex t e nsion
Installation and
Service Instructions
for use by heating contractor
EM-EA1 extension
DIO electronics module
Function extension
Product may not be exactly as shown
Read and save these instructions
for future reference.
IMPORTANT
Certified as a component
part for Viessmann boilers

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Safety, Installation and Warranty Requirements
Please ensure that these instructions are read and understood before commencing installation. Failure to comply with
the instructions listed below and details printed in this manual can cause product/property damage, severe personal
injury, and/or loss of life. Ensure all requirements below are understood and fulfilled (including detailed information
found in manual subsections).
Product documentation
Read all applicable documentation before commencing
installation. Store documentation near boiler in a
readily accessible location for reference in the future
by service personnel.
For a listing of applicable literature,
please see section entitled “Important
Regulatory and Safety Requirements”.
Licensed professional heating contractor
The installation, adjustment, service and maintenance
of this equipment must be performed by a licensed
professional heating contractor.
Please see section entitled Safety and
“Important Regulatory and Installation
Requirements”.
Advice to owner
Once the installation work is complete, the heating
contractor must familiarize the system operator/
ultimate owner with all equipment, as well as safety
precautions/requirements, shutdown procedure, and
the need for professional service annually before the
heating season begins.
Safety
Warranty
Information contained in this and
related product documentation must
be read and followed. Failure to do
so renders the warranty null and void.
2
Safety, Installation and Warranty Requirements

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EM-EA1 Extension Installation / Service
3
Safety
Important Precautions
General Information
Installation
Connections
Wiring/Specification
Page
Table of Contents
Page
Safety, Installation and Warranty Requirements..............2
Important Regulatory and Installation Requirements ........4
About these Installation Instructions .............................5
Intended Use .............................................................5
Product Information .................................................... 5
Mounting the Extension ..............................................6
Overview of Electrical Connections ............................ 7
Electrical Connections .............................................. 8
Connecting External Functions ....................................9
Connecting the Fault Message Input and
Fault Message Output ..............................................11
Connecting the External LPG Valve ...........................13
Connecting the External Extractor Interlock ................13
Connecting the PlusBus to the Boiler .........................13
Power Supply ..........................................................14
Rotary Switch S1 for Subscriber Number Addressing ....15
Configuring Functions ...............................................15
Wiring Diagram ........................................................16
Specifications ..........................................................16

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Important Precautions
Important Regulatory and Installation Requirements
Approvals
Viessmann boilers, burners and controls are approved for
sale in North America by CSA International.
Codes
The installation of this unit shall be in accordance with
local codes. In the absence of local codes, use:
- CSA C22.1 Part 1 and/or local codes in Canada
- National Electrical Code ANSI/NFPA 70 in the U.S.
Always use latest editions of codes.
The heating contractor must comply with the Standard
for Controls and Safety Devices for Automatically Fired
Boilers, ANSI/ASME CSD-1 where required by the
authority having jurisdiction.
Working on the equipment
The installation, adjustment, service, and maintenance
of this product must be done by a licensed professional
heating contractor who is qualified and experienced in the
installation, service, and maintenance of hot water boilers.
There are no user serviceable parts on the boiler, burner,
or control.
Power supply
Install power supply in accordance with the regulations
of the authorities having jurisdiction or, in absence of
such requirements, in accordance with National Codes.
Viessmann recommends the installation of a disconnect
switch to the 120V power supply outside of the boiler
room.
Ensure main power supply to equipment, the heating
system, and all external controls have been deactivated.
Close main oil or gas supply valve. Take precautions in
both instances to avoid accidental activation of power
during service work.
Please carefully read this manual prior to attempting
installation. Any warranty is null and void if these
instructions are not followed.
For information regarding other Viessmann System
Technology componentry, please reference
documentation of the respective product.
We offer frequent installation and service seminars
to familiarize our partners with our products. Please
inquire.
The completeness and functionality of field supplied
electrical controls and components must be verified
by the heating contractor. These include low water
cut-offs, flow switches (if used), staging controls,
pumps, motorized valves, air vents, thermostats, etc.
WARNING
Turn off electric power supply before
servicing. Contact with live electric
components can cause shock or loss
of life.

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About these Installation Instructions
General Information
Take note of all symbols and notations intended to draw attention to potential hazards or important
product information.
CAUTION
Cautions draw your attention to the presence of potential
hazards or important product information.
WARNING
Warnings draw your attention to the presence of potential
hazards or important product information.

IMPORTANT
Indicates an imminently hazardous situation which,
if not avoided, could result in death, serious injury or
substantial product/property damage.
Indicates an imminently hazardous situation which,
if not avoided, may result in minor injury or product /
property damage.
Helpful hints for installation, operation or maintenance
which pertain to the product.
This symbol indicates to note additional information
This symbol indicates that other instructions must be
referenced.
Intended Use
Intended use presupposes that a fixed installation in
conjunction with permissible components designed for
this purpose has been carried out.
Every other use will be deemed to be inappropriate.
Any resulting losses are excluded from the manufacturer’s
liability.
Any usage beyond this must be approved by the
manufacturer for the individual case.
Intended use also includes the adherence to maintenance
and inspection intervals.
Product Information
Maximum 3 EM-EA1 function extensions can be
connected to one boiler.
Only one function can be connected to each EM-EA1
function extension (DIO electronics module).
The functions that can be connected depend on the
settings made at the boiler.
Boiler installation and service instructions
Spare parts lists
Information about spare parts can be found on the
Viessmann spare parts app.
The appliance is only intended to be installed and
operated in sealed unvented heating systems, with due
attention paid to the associated installation, service and
operating instructions.
It is only designed for the heating up of heating water.
Commercial or industrial usage for a purpose other than
the heating up of heating water shall be deemed
inappropriate.

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Installation/ Connections
Mounting the Extension
1. Loosen the retaining screws from the extension kit
enclosure (do not remove).
2. Remove cover and set aside.
3. Mount the extension module enclosure to the wall
using the supplied hardware.
4. Install the cover.

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Overview of Electrical Connections
Legend
DI1 Digital input 1
DI2 Digital input 2
DI3 Digital input 3
0 - 10V IN 0 - 10V input
0 - 10V OUT 0 - 10V output
F4 Fuse 2 A (slow)
PWM1 Control voltage output
S1 Rotary switch for subscriber number
addressing
Z1 fD 120V relay output, 120V input
fÖ Power supply
fÖ A Power supply for additional accessories
hH Changeover contact (floating switching
contact) for connecting signalling
equipment for fault messages or an
extractor hood
jF PlusBus
Connections

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Connections
Overview of Electrical Connections (continued)
CAUTION
The electronic modules are static
sensitive. To avoid damage caused by
static discharge, follow Electro-Static
Discharge safety procedures.
Electrical Connections
Apply strain relief to on-site cables.
Seal any unnecessary apertures with cable grommets
(not cut open).
Function Page Connections:
DI1 DI2 DI3 PWM1 0-10V hH fD
IN OUT 43-1 43-L
External functions
External default set supply temperature
External default output
Operating mode changeover
External demand
External blocking
8
9
10
10
11
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Fault message input and fault message output
Connection without system blocking
Connection with system blocking, 120V
Connection with system blocking, 24V
Connecting only message facility (e.g. buzzer)
11
12
13
13
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External LPG valve 13 -- -- -- -- -- -- -- -- X
External extractor interlock 13 -- -- -- -- -- -- X -- --
WARNING
Incorrect wiring can lead to serious injury from
electrical current and result in appliance damage.
Take the following measures to prevent wires drifting
into the adjacent voltage area:
Route low voltage leads away from 120V or other high
voltage cables.
Secure with cable ties.
Strip as little of the insulation as possible, directly
before the terminals. Bundle the cables close to the
corresponding terminals.
If 2 components are connected to the same terminal,
press both wires together in a single wire ferrule.

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Connecting External Functions
Connecting external default set supply temperature:
0 - 10V IN
Analog input for connecting the external default set
supply temperature or the external default output
Connecting an external default output: 0 - 10V IN
Analog input for connecting the external default set
supply temperature or the external default output
When making the connection, ensure correct polarity
of the DC control voltage 0 - 10V.
Note: No galvanic separation is required between the
earth conductor and the negative pole of the on-site
power source.
The 0 to 10V hook-up generates the following default
output for the boiler:
< 1V 0%
1V 10% or lower modulation limit
10V 100%
If 120V voltage is present at digital input 43-1,
the external default output is enabled.
Legend
AEnable signal
BJunction box
When making the connection, ensure correct polarity
of the DC control voltage 0 - 10V.
Note: No galvanic separation is required between the
earth conductor and the negative pole of the on-site
power source.
The 0 to 10V hook-up generates the following set supply
temperatures:
<1V No default set supply temperature
1V 10°C
10V 100°C or max. set supply temperature in
accordance with factory-set limit for boiler
If 120V voltage is present at digital input 43-1,
the external default set supply temperature is enabled.
Legend
AEnable signal
BJunction box

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Connections
Connecting External Functions (continued)
Connecting external demand: fD
The demand is active if 120V voltage is present at digital
input 43-1. A demand is issued to the boiler.
The set values for the supply temperature and the speed
of the primary pump are specified with parameters
528.0 and 1100.2.
Connecting the operating mode changeover: DI1 to DI3
Continuous operation or room temperature dependent
operation
As soon as the contact closes, the following demands
become active:
Set supply temperature demand for the system
Demand for all installed heating circuits simultaneously,
at the respective programmed temperature level of the
individual heating circuit:
DI1 Reduced supply temperature
DI2 Standard supply temperature
DI3 Comfort supply temperature
(Only with continuous operation)
External contacts at DI1, DI2 and DI3 must be
potential-free.
Weather-compensated operation
As soon as the contact closes, the following demand
becomes active:
Demand for all installed heating circuits simultaneously,
with the respective programmed set room temperature
of the individual heating circuit:
DI1 Reduced room temperature
DI2 Standard room temperature
DI3 Comfort temperature
Connecting external blocking: fD
If 120V voltage is present at digital input 43-1, the
boiler is blocked. The message I.57 is shown.
Legend
A Signal for external demand or external blocking
B Junction box

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Legend
A Signal for external demand or external blocking
B Junction box
Connecting the fault message input and fault message
output
Connection without system blocking via 120V fault
message input: fD
Fault message input 43-1 and conductor L of the
power supply at plug fÖ must be connected in phase.
Rated current at floating fault message output hH:
Max. 1A ~.
The fault message is active if 120V voltage is present
at digital input 43-1. Floating fault message output hH
is switched over from “Ö” to “S”.
Connecting the Fault Message Input and Fault Message Output
Connections

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Connections
Connecting the Fault Message Input and Fault Message Output (continued)
Connecting the fault message input and fault message
output (continued)
Connection without system blocking via 120V fault
message input: fD
Fault message input 43-1 and conductor L of the
power supply at plug fÖ must be connected in phase.
Rated current at floating fault message output hH:
Max. 1A ~.
The fault message is active if 120V voltage is present
at digital input 43-1. Floating fault message output hH
is switched over from “Ö” to “S”.
Legend
A Fault message facility
B Junction box
Connecting only message facility: hH
Example: Buzzer with illuminated signal switched in
parallel
Note:
External contacts at DI1 must be potential-free.
Rated current at fault message output hH:
Max. 1 A ~.
The fault messaging is active if the digital fault
message input DI1 is closed. The boiler is blocked.
Floating fault message output hH is switched over
from “Ö” to “S”. Fault message F.104 is shown.
Connection with system blocking via 24V fault message
input: DI1
Example: Connecting a condensate removal pump

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Connecting the External LPG Valve: fD
Output 43-L is active as soon as the burner control unit
starts the burner. The external LPG valve opens.
Connecting the External Extractor Interlock: hH
Example: Extractor hood
The floating contact switches from “Ö” to “S” as soon
as the burner control unit starts the burner. The extractor
is switched off.
Connecting the PlusBus to the Boiler
Legend
AExtension (electronics module)
BPlusBus to boiler
Note: If making the connection to the boiler with an
external plug for the bus connection, disconnect
plug jF and connect the wires directly.
Boiler installation and service instructions
Connections

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Power Supply
WARNING
The absence of component grounding in the system can
lead to serious injury from electrical current if an electrical
fault occurs. Connect the appliance and pipework to the
equipotential bonding of the building in question.
WARNING
Incorrect core allocation can result in serious injury and
damage to the appliance.
Never interchange cores “L” and “N”.
WARNING
Incorrectly executed electrical installations can result in
injuries from electrical current and in equipment damage.
Direct power supply
CAUTION
An incorrect phase sequence can cause damage
to the appliance. Check for phase equality with
the power supply connection of the control unit.
Legend
A Extension EA1
Connect the power supply (see page 4) and implement
all grounding measures (e.g. RCD circuit) in accordance
with the following regulations:
HIn Canada all electrical wiring is to be done in
accordance with the latest edition of CSA C22.1 Part 1
and/or local codes. In the U.S. use the National
Electrical Code ANSI/NFPA 70. The heating contractor
must also comply with both the Standard for Controls
and Safety Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1, and the Installation Code for
Hydronic Heating Systems, CSA B214-01, where
required by the authority having jurisdiction.
HConnection requirements specified by your local power
supply utility
HProtect the power cable with max. 15A
Connections

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Rotary Switch S1 for Subscriber Number Addressing
Set rotary switch S1 to a consecutive numbers as
shown in the example below:
1st EM-EA1 extension: Rotary switch to 1
2nd EM-EA1 extension: Rotary switch to 2
3rd EM-EA1 extension: Rotary switch to 3
Note: These settings are independent of the settings
made at other extensions, such as EM-M1 (mixeing
module). If an EM-EA1 extension (DIO electronics
module) has the setting 1, an EM-M1 or EM-P1
extension (ADIO electronics module) can also have
the setting 1.
Configuring Functions
Set the connected function during commissioning of
the boiler.
Commissioning assistant boiler installation
and service instructions
Setting for the connected function in the commissioning assistant:
Function Setting
External functions
External default set supply temperature
External default output
Operating mode changeover
External demand
External blocking
“External set supply temperature 0 to 10V”
“External default output 0 to10V”
“Operating mode changeover”
“External demand”
“External blocking”
Fault message input and fault message output
Connection without system blocking
Connection with system blocking, 120V
Connection with system blocking, 24V
Connecting only message facility (e.g. buzzer)
“Fault message input 120V and fault message output”
“Fault message input 120V and block system”
“Fault message input 24V and block system”
“Fault message output 120V”
External LPG valve “LPG valve”
External extractor interlock “Cooker hood”
Connections

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Legend
DI1 Digital input 1
DI2 Digital input 2
DI3 Digital input 3
0 - 10V IN 0 - 10V input
0 - 10V OUT 0 - 10V output
F4 Fuse 2 A (slow)
PWM1 Control voltage output
S1 Rotary switch for subscriber number
addressing
Z1 fD 120V relay output, 120V input
fÖ Power supply
fÖ A Power supply for additional accessories
hH Changeover contact (floating switching
contact) for connecting signalling
equipment for fault messages or an
extractor hood
jF PlusBus
Specifications
Rated voltage 120V ~
Rated frequency 60 Hz
Rated current 2A
Power consumption – electronics 2.8 W
Permissible ambient temperature
Operation
Storage and transport 32 to 104°F (0 to +40°C) -4 to +140°F (–20 to +60°C)
Output for rated breaking capacity hH (floating) 1A, 120V~
Rated breaking capacity of output Z1 fD 1A, 120V~
Technical information subject to change without notice. Printed on environmentally friendly
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Wiring /Specification
Wiring Diagram