Viessmann EM-EA1 extension Guide rapide

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

5472 514 - 02

EM-EA1 Extension Installation / Service

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.

Safety, Installation and Warranty Requirements

5472 514 - 02

EM-EA1 Extension Installation / Service

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

5472 514 - 02

EM-EA1 Extension Installation / Service

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.

5472 514 - 02

EM-EA1 Extension Installation / Service

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.

5472 514 - 02

EM-EA1 Extension Installation / Service

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.

5472 514 - 02

EM-EA1 Extension Installation / Service

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

5472 514 - 02

EM-EA1 Extension Installation / Service

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

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)

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.

5472 514 - 02

EM-EA1 Extension Installation / Service Connections

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

5472 514 - 02

EM-EA1 Extension Installation / Service

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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