Viessmann Vitotherm ES4 Quick guide

Please retain for future use
Installation and service
instructions
for contractors
6167217 GB 11/2020
Vitotherm ES4
Version ES4.A5 K
Version ES4.A5 OK
Version ES4.A5 OTK
Electric water heater
VITOTHERM ES4

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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.
■The appliance must be connected to
the power supply via a dedicated fixed
socket. The power cable and fuse
must be sized appropriate to the
output of the appliance.
■This appliance of protection class I
must be permanently connected to
the 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 the appliance
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.
■ 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
■
Connection to the water system ..................................................... 7
■
Installation with safety valve for pressure-tested installation ....... 8
Wiring diagram ................................................................................9
Electrical installation......................................................................10
3. Maintenance Operation....................................................................................... 11
■Switching on............................................................................... 11
■Temperature control ................................................................... 11
■Venting .......................................................................................12
■Faults..........................................................................................12
Removing the cover.......................................................................13
List of spare parts..........................................................................14
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
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.
Electric water heater for pressurised or
non-pressurised installation.
Max. water pressure in system: 0.6 MPa
■Corrosion-resistant stainless steel
cylinder
Anode does not need to be replaced on a
regular basis.
■Efficient heating module
Output: 2000 W
DHW heating from 10 to 40 °C in 5.5 min
for 5 l
■ Energy efficiency class A
Very low energy loss.
■ Functional temperature control
Water temperature can be variably
adjusted between 23 and 70 °C
Types of installation
Types ES4.A5 OK and ES4.A5 OTK:
Appliances for installation above a washbasin
with water connections pointing vertically
downwards.
Type ES4.A5 K:
Appliances for installation below a washbasin
with water connections pointing vertically
upwards.
Note:
In a pressurised installation, water may
occasionally escape from the safety valve.
In a non-pressurised installation, water may
occasionally escape from the hot water
draw-off point.
This is not a malfunction.
Any water that occasionally escapes must be
able to drain away freely at all times.

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Installation
Installation sequence
Connection to the water system
Shutting off the cold water supply will cause
the appliance to malfunction.
Non-pressurised installation:
• Fit the hot water tap over a basin with
a drain.
• Do not install any devices between the
hot water outlet of the appliance and the
water outlet of the fitting which could
inhibit the flow. A free outflow of water
must be guaranteed at all times.
Pressurised installation:
• For system water pressures above
0.6 MPa, a pressure reducing valve must
be installed upstream of the safety valve
on the cold water supply.
• Connect the safety valve to a drain line.
• The safety valve and the outlet line must
not be installed in rooms where
temperatures below 0 °C occur.
• Do not install a shut-off valve between the
safety valve and the electric water heater.
Type ES4.A5 OTK:
■
Install only with water connections
pointing vertically downwards.
■
Only connect the fitting that has been
supplied with this appliance.
■
A pressure reducer and safety valve are
not required as the appliance is only
operated as a non-pressurised system.
Fastening with rawl plugs:
1. Insert two 8 mm diameter rawl plugs into
the wall 140 mm apart
.
2. Screw in the fixing screws until the
clearance between the screw head and
the wall is no more than 4 mm.
3. Hang the electric water heater on the
screws.
Fastening with wall mounting bracket:
1. Fit the wall mounting bracket.
2. Hang the electric water heater on the wall
mounting bracket and secure it in place
with the fixing screws.
For type ES4.A5 OTK, a clearance must
be maintained between the fixing screws
and the fitting.
Fit the appliance to a stable wall in a vertical
position. Connections are at the top or bottom,
depending on the type.

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Installation sequence
1. Prepare the cold water supply according
to local regulations and connect to the
appliance:
Types ES4.A5 OK and ES4.A5 K:
Connect the cold water pipe to the inlet
connector and the DHW outlet to the
outlet connector: See adjacent diagrams.
It is essential that a safety valve [6] with
a nominal pressure of 0.6 MPa is installed
in the cold water supply.
Type ES4.A5 OTK:
Insert gaskets into the nuts and connect
the fitting to the appliance using metal
pipes or flexible hoses. Recommended
distance between metal pipes and wall:
~34 mm.
2. Route the drain line for the safety valve
downwards, ensuring it is located in a
frost-free environment.
3. Open the hot water tap (red) and fill the
integral cylinder completely with water
(water must run out of the hot water tap
free of bubbles).
4. Check connections for tightness.
Installation with safety valve for pressure-tested installation
Type ES4.A5 OK must be installed with
connections pointing vertically downwards.
Type ES4.A5 K must be installed with
connections pointing vertically upwards.
3 Inlet connector (cold water)
4 Outlet connector (DHW)
5 DHW outlet
6 Safety valve
7 Pressure reducing valve (for system
water pressures above 0.6 MPa)
8 Shut-off valve
9 Cold water supply

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Installation sequence
Wiring diagram
E1 – Heating module
F1 – Thermal circuit breaker
K1 – Thermostat
X1 – Terminal strip
XP – Power cable
H1 – Heating display

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Installation sequence
Electrical installation

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Maintenance
Operation
Switching on
Caution
The appliance may be damaged if it is
switched on before it is completely filled.
Do not switch on the appliance until the
integral cylinder is completely filled with
water.
Draining
Caution
The appliance may be damaged if the
safety valve is not functioning correctly.
■ Open the safety valve regularly and
remove any deposits.
■ Check the safety valve regularly for
blockages and correct operation:
Turn the lever of the safety valve so
that water flows out of the outlet
pipe. If no water comes out of the
outlet pipe, the valve is faulty and the
appliance must not be operated in
pressurised water systems.
Caution
The appliance may be damaged if
operated in areas at risk from frost.
If there is a risk of frost, drain the
appliance completely:
■ Appliances installed above
washbasins (types ES4.A5 OK and
ES4.A5 OTK):
Undo the connection pipe from the
inlet connector (cold water). Open
the hot water tap.
■ Appliances installed under the
washbasin (type ES4.A5 K):
Undo flexible hoses from inlet and
outlet connectors (hot and cold
water). Unhook the appliance at the
wall and turn it 180° to drain it.
Temperature control
A rotary switch for adjusting the temperature
is located on the front of the appliance.
■ Switching on:
Turn the temperature switch clockwise.
The water temperature can be variably
adjusted between " " (~7 °C) and "○○○"
(~70 °C). In heating mode, the LED
illuminates and the water is heated.
■ Switching off:
Turn the temperature switch anticlockwise.
Position when appliance is switched off:
See adjacent diagram.

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Operation (cont.)
Faults
Maintenance
Venting
Caution
Air in the water installation may damage
the appliance.
Vent the system after working on the
appliance or the water installation.
1. Switch off the power supply, e.g. at the
separate fuse or a mains isolator.
2. Open and close the hot water tap several
times to vent the water installation until a
constant, even flow of water is achieved.
3. Turn the rotary switch to the required
temperature.
4. Switch on the power supply.
No. Fault Background Remedy
1.
The appliance is not
heating the water
and the LED is not
illuminated.
Power supply fault. Check the fuses.
Fault with the rotary
temperature switch.
Replace the rotary
temperature switch.
(Heating contractor)
2.
The appliance is not
heating the water and
the LED is illuminated.
Fault with the heating
module.
Replace the appliance.
(Heating contractor)
Fault with the temperature
limiter.
Switch on the temperature
limiter or replace it.
(Heating contractor)
3.
The appliance is heating
the water and the LED is
not illuminated.
Fault with the LED. Replace the LED.
(Heating contractor)

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Maintenance
Removing the cover

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Maintenance
List of spare parts
Position Spare part Description
Quantity
(number)
1 7857667 Front casing ES4.A5 OK OTK 1
2 7857674 Back panel ES4.A5 OK OTK 1
3 7857679 Rotary selector ES.A5 1
4 7857673 Front casing ES4.A5 K 1
5 7857674 Back panel ES4.A5 K 1
6 7857668
Cylinder, complete ES4.A5 OK OTK 1/2" 1
7 7857669
Cylinder, complete ES4.A5 K 1/2" 1
8 7857670 Illuminated ring ES4 1
9 7857675 Thermo
st at ES4.A5 1
10 7857694 Fitting ES4.A5 A10 OTK 1
12 7857671 Pipe set for tting
ES4 OTK 1/2" 1
13 7877982 Power cable ES4.A5 GB 1
14 7857677 Safety valve ES4 1
15 7857676 Safety switch ES4 1
16 7857666 Thermal insulation ES4.A5 1

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Specification
Appendix
VITOTHERM DHW cylinder ES4.A5 K ES4.A.5 OK ES4.A.5 OTK
Contents l 5
Voltage 220 - 240 V~
Rated output W 2000
Rated current A 8.3 - 9.1
Temperature range °C 23 - 70
Pressure stage MPa 0.6
Dimensions (height x width x depth) mm 427 x 285 x 163
Weight
(dry) kg 4.4
IP rating IP 24
Water connection (male thread) G 1/2"
Water connection (mixer tap) - - G 1/2"

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Viessmann Werke GmbH & Co. KG
D-35107 Allendorf
Phone: [phone]
Fax: [phone]
www.viessmann.com
The appliance must not be disposed of with domestic waste.
The appliance must be taken to a collection point for electrical
and electronic waste for recycling.
Correct disposal of the product prevents potentially harmful
e󰀨ects on the environment, which can occur due to the
improper handling of waste. For more information on recycling
this product, please contact your local government, a
waste disposal service, or the store where this product was
purchased.
Copyright: Viessmann Poland. The reproduction, copying or use of this document
or parts thereof without the consent of the author is not permitted. 10/2020
Subject to technical modications.