Viessmann VITOTHERM EI5 Series Quick guide

Vitotherm EI5
Version EI5.A3 K
Version EI5.A5 K
Electric instantaneous water heaters
Please retain for future use
Installation and service
instructions
for contractors
VITOTHERM EI5
6167196 GB 11/2020

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Danger
This symbol warns against the
risk of injury.
These instructions are exclusively
intended for qualified contractors.
Caution
This symbol warns against the
risk of material losses and
environmental pollution.
Note
Details identified by the word "Note"
contain additional information.
Safety instructions explained
Target group
For your safety
Safety instructions
■National installation regulations
■Statutory regulations for the
prevention of accidents
■Statutory regulations for
environmental protection
■Codes of practice of the relevant trade
associations
Regulations to be observed
■Work on electrical equipment must
only be carried out by a qualified
electrician.
■The system must be commissioned
by the system installer or a qualified
person authorised by the installer.
■Relevant safety regulations
■Requirements stipulated by the local
power supply utility
■Requirements stipulated by the local
water company
Before installing, commissioning and operating the appliance, please read the
documents enclosed with the appliance.
Follow the safety instructions closely to prevent hazards, injury and material
losses.
Store the supplied documents in a safe place.

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For your safety (cont.)
Installation work
Safety instructions
Danger
Contact with live components can
result in severe injuries. Some
components remain live even after
the power supply has been
switched off. Wait at least 4 minutes
for the voltage to discharge before
removing the appliance covers.
Safety instructions for working on the appliance
Danger
Hot surfaces and fluids can cause
burns.
■Switch off the appliance and
allow it to cool down before
carrying out any maintenance
work.
■Do not touch hot surfaces on the
appliance, fittings or pipes.
■Switch off the power supply, e.g. at
the separate fuse or a mains isolator.
■Safeguard the power supply against
reconnection.
■ Check that it is no longer live.
■Do not make any modifications to the
water or electrical installations.
■Do not make any structural
modifications to the appliance.
Maintenance work
■
Only install the appliance on a suitably
stable wall with the fixing materials
provided.
■Do not make any structural
modifications to the appliance.
■Install an isolator in the power cable
to provide omnipolar separation from
the mains for all active conductors,
corresponding to overvoltage
category III (3 mm) for full isolation.
The isolator must be fitted in the
permanent electrical installation, in
line with installation requirements.
We also recommend installing an
RCD (Class A) for pulsating DC (fault)
currents.
■Connect the power cable to the
electricity supply using a fixed
connection.
Select a cable cross-section and fuse
appropriate to the output of the
appliance.
■An appliance of protection class I
must be permanently connected to an
earth conductor.
■Provide protection against contact
with live parts. Install covers.

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Caution
Repairing components that fulfil a
safety function can compromise the
safe operation of the appliance.
Replace faulty components only
with genuine Viessmann spare
parts.
Repair work Auxiliary components, spare parts
and wearing parts
Caution
Spare parts and wearing parts that
have not been tested together with
the appliance can compromise its
function.
Installing non-authorised
components and making
non-approved modifications or
conversions can compromise safety
and may invalidate our warranty.
■For replacements, only use
original Viessmann parts or spare
parts approved by Viessmann.
■For appliances with a power
cable, use only original
Viessmann spare parts.
For your safety (cont.)
Safety instructions
Danger
If there are leaks in the appliance,
there is a risk of electric shock.
■Isolate the appliance from the
power supply e.g. At the
separate fuse or by means
of a mains isolator.
■Close the cold water supply
shut-off valve.
Safety instructions for operating the device
If water escapes from theappliance
Danger
If water escapes from the
appliance, there is a risk of
scalding.
Never touch hot water.
■Only operate the appliance after it has
been properly installed on the wall.
■ For showers, the DHW temp. must
not exceed 55 °C (EN 60335-2-35).
If necessary, install safety equipment
to prevent scalding.
■ Comply with the permissible operating
data, as specified on the type plate.
Operation of the appliance

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Table of contents
1. Information Disposal of packaging .....................................................................6
Intended use....................................................................................6
Product information .........................................................................6
2. Installation
sequence
Installation .......................................................................................7
■Assembly with inlet and outlet pipes at the bottom of the appliance. 8
■Assembly with inlet and outlet pipes at the top of the appliance....... 8
Connection and wiring diagram.......................................................9
■Wiring diagram for type EI5.A3 K................................................9
■Connection diagram for type EI5.A3 K........................................ 9
■Wiring diagram for type EI5.A5 K..............................................10
■Connection diagram for type EI5.A5 K...................................... 10
3. Maintenance Operation....................................................................................... 11
■Venting ....................................................................................... 11
■Maintenance............................................................................... 11
Structure of the instantaneous water heater..................................12
Removing the complete heating module .......................................13
4. Appendix Specification ..................................................................................15
Table of contents

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Disposal of packaging
Information
Please dispose of packaging waste in line
with statutory regulations.
Intended use
Product information
Types of installation
■ The appliance can be installed above or
below a washbasin.
■ The appliance can be installed with water
connections at the top or at the bottom.
Fine-spray controller (included)
For water and energy savings of up to 50 %,
install the supplied fine-spray controller in the
water outlet of the fitting.
The appliance is used for the heating of
domestic hot water and can supply one or
more draw-off points as applicable.
The appliance is intended for domestic use. It
can be operated safely by untrained persons.
The appliance can also be used in a
non-domestic environment, e.g. in a small
business, as long as it is used in the same
way.
Any use that differs from or goes beyond this
is considered inappropriate.
Intended use also extends to compliance with
these instructions and with the instructions for
any accessories used.
The appliance is suitable for pressure-tested
and non-pressurised installation.
The appliance is equipped with a differential
pressure switch.
The differential pressure switch automatically
switches on the heating function when
sufficient water flows through the appliance.

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Installation
Installation sequence
supplied fine filter and flow limiter in the
cold water supply. Ensure that gaskets are
seated correctly.
4. Slowly open the shut-off valve in the cold
water supply pipe. Check the appliance
and the water connections for leaks.
5. Thoroughly vent the appliance and the
water pipes: See chapter "Venting".
6. Electrical connections:
Connect the power cable. Fit the strain
relief.
7. Fit cover.
8. Ensure that live parts cannot be touched
through the openings on the back of the
appliance.
9. Switch on the power supply. Check
that the appliance is working correctly.
Prepare the water pipes and the electric
cables according to local regulations and
connect to the appliance:
1. Remove the cover from the appliance:
Undo the screw. Remove the cover
starting on the side with the connections.
2. Secure the appliance to a stable wall in a
vertical position, with the inlet and outlet at
the top or bottom of the appliance: See
the following diagrams.
3. Connect the cold water and DHW pipes to
the appliance. When doing so install the

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Installation (cont.)
Installation sequence
Flow limiter
EI5.A3 K Black: 1.9 l/min
EI5.A5 K Violet: 3.4 l/min
Assembly with inlet and outlet pipes
at the bottom of the appliance.
Assembly with inlet and outlet pipes
at the top of the appliance.

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Connection and wiring diagram
Installation sequence
F1 – Safety pressure switch
BV – Differential pressure switch
Q1,Q2 Switching contacts of differential
pressure switch
E1 – Heating module
X1 – Power cable
Wiring diagram for instantaneous water heater EI5.A3 K
Connection diagram for instantaneous water heater EI5.A3 K
Outlet
connector
Inlet
connector

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Installation sequence
Connection and wiring diagram (cont.)
F1 – Safety pressure switch
BV – Differential pressure switch
Q1,Q2
Switching contacts of differential pressure switch
E1 – Heating module
XP – Power cable
Wiring diagram for instantaneous water heater EI5.A5 K
Connection diagram for instantaneous water heater EI5.A5 K
Outlet
connector
Inlet
connector