Viessmann Vitotron 100 Series User manual

Vitotron 100
Type VMN3, VLN3
Electric instantaneous water boiler for central heating
6155049 GB 6/2020
Installation and
operating instructions
VITOTRON100

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6155049
Please follow these safety
instructions closely to prevent
hazards, injury and material losses.
Danger
This symbol warns against the risk
of injury.
These instructions are exclusively
intended for qualied contractors.
■National installation regulations
■Statutory regulations for the prevention
of accidents
■Statutory regulations for environmental
protection
■Work on electrical equipment must only
be carried out by a qualied electrician.
■The system must be commissioned by
the system installer or a qualied
person authorised by the installer.
Caution
This symbol warns against the risk
of material losses and environmental
pollution.
Note
Details identied by the word "Note"
contain additional information.
Safety instructions explained
Target group
Regulations to be observed
Safety instructions
Safety instructions
■Codes of practice of the relevant trade
associations
■Relevant safety regulations in each
country

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6155049
Safety instructions (cont.)
Safety instructions for working on the system
■Isolate the system from the power
supply, e.g. by removing the separate
fuse or by means of a mains isolator,
and check that it is no longer live.
Note
In addition to the control circuit, there
may be several power circuits.
Danger
Contact with live components can
result in severe injuries. Some
components on PCBs remain live
even after the power supply has
been switched off. Wait at least
4 minutes until the voltage has
completely dropped out before
removing the covers from the
appliances.
■
Safeguard the system against
reconnection.
■Wear suitable personal protective
equipment when working on the
system.
Working on the system
Safety instructions
Caution
Electronic assemblies can be
damaged by electrostatic discharge.
Prior to commencing any work,
touch earthed objects such as
heating or water pipes to discharge
static loads.
Danger
Hot surfaces and uids can cause
burns or scalding.
■Before maintenance and service
work, switch OFF the appliance
and let it cool down.
■Never touch hot surfaces on the
appliance, ttings or pipework.
Caution
Repairing components that full
a safety function can compromise
the safe operation of the system.
Replace faulty components only
with genuine Viessmann spare
parts.
Caution
Spare and wearing parts that have not
been tested together with the system
can compromise its function. Installing
non-authorised components and
making non-approved modications
or conversions can compromise
safety and may invalidate our
warranty. For replacements, use
only original spare parts supplied
or approved by Viessmann.
Maintenance
Auxiliary components, spare and
wearing parts
Danger
If water escapes from the appliance
there is a risk of electric shock. Switch
OFF the heating system at the external
isolator (e.g. fuse box, domestic
distribution board).
Danger
If water escapes from the appliance
there is a risk of scalding. Never
touch hot heating water.
Safety instructions for operating the system
What to do if water escapes from the
appliance

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6155049
Keyword index
Information
Preparing for installation
Installation sequence
Specication
Disposal of packaging ............................................................................. 5
Symbols ................................................................................................... 5
Intended use ............................................................................................ 5
Product information ................................................................................. 5
Product description .................................................................................. 6
Installation information ............................................................................. 6
Connecting the boiler to the central heating system ................................ 7
Assembly and installation ........................................................................ 8
Selecting the power supply type ............................................................ 12
Connecting external sensors and control devices ................................. 13
Extending the system with additional heating circuits ........................... 15
Description ............................................................................................. 16
Connection ............................................................................................ 17
Using the control panel .......................................................................... 18
Removing the side cover ....................................................................... 26
Internal view VMN3 ............................................................................... 27
Internal view VLN3 ................................................................................ 28
Structure of the boiler – water section ................................................... 29
Heater .................................................................................................... 30
Removing the heater ............................................................................. 31
Description of PCB MSK.80/04 VMN3 .................................................. 32
Description of PCB MSK.80/05 VLN3 ................................................... 33
Schematic diagram MSK.80/04 VMN3 .................................................. 34
Schematic diagram MSK.80/05 VLN3 ................................................... 35
Connecting optional appliances ............................................................. 36
Wiring diagram 4–8 kW ......................................................................... 37
Wiring diagram 12–24 kW ..................................................................... 38
Connecting the PCB 4–8 kW (VLN3, VMN3) ........................................ 39
Connecting the PCB 12–24 kW (VLN3, VMN3) .................................... 40
Fault messages ..................................................................................... 41
"Service" test mode ............................................................................... 42
Spare parts list ....................................................................................... 44
Specication .......................................................................................... 45
1.
2.
3.
4.
Keyword index

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6155049
Disposal of packaging
Symbols
Please dispose of packaging waste in line with
statutory regulations.
Information
Symbol Meaning
See other documents for more
information
Warning of material losses and
environmental pollution
Intended use
Product information
The appliance is intended solely for installation and
operation in sealed unvented heating systems that
comply with EN 12828, with due attention paid to the
associated installation, service and operating
instructions.
Depending on the version, the appliance can only be
used for the following purposes:
■
Central heating
■
DHW heating
The range of functions can be extended with additional
components and accessories.
Intended use presupposes that a xed installation in
conjunction with permissible, system-specic
components has been carried out.
Vitotron 100, type VLN3, VMN3
The Vitotron 100 may only be delivered to the
countries specied on the type plate. For deliveries
to other countries, approved contractors must arrange
individual approval on their own initiative and in
accordance with the law of the country in question.
The type plate is located at the top of the boiler.
Commercial or industrial usage for a purpose other
than central heating or DHW heating shall be deemed
inappropriate.
Incorrect usage or operation of the appliance
(e.g. the appliance being opened by the system user)
is prohibited and will result in an exclusion of liability.
Incorrect usage also occurs if the components in the
heating system are modied from their intended
function.
Note
The appliance is intended exclusively for domestic or
semi-domestic use, i.e. even users who have not had
any instruction are able to operate the appliance
safely.

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6155049
Product description
The Vitotron 100 is a system boiler with an optional
connection to a DHW cylinder.
In the delivered condition, the Vitotron type VLN3 is
set up for operation with a constant boiler water
temperature.
In the delivered condition, the Vitotron 100 type VMN3
is set up for weather-compensated operation. An
outside temperature sensor and a room temperature
sensor are included in the standard delivery.
The appliance is equipped with a sealed unvented
hydraulic system with 2 connections for the heating
ow and return.
These boilers are only intended for installation in
sealed unvented heating systems. Boilers for open
vented heating systems are also available.
The following components are integrated into the
hydraulic system:
■
Circulation pump
■
Safety valve
■
Diaphragm expansion vessel (5 litres)
Information
Installation information
The VMN3 boiler is equipped with an expansion vessel
(content: 5 l, pressure: 1.5 bar). The expansion vessel
is sufcient for the following heating system capacities
at the specied heating medium temperatures and the
specied central heating system pressure.
If a higher capacity is required for the moist central
heating system, an additional expansion vessel must
be installed.
Heating medium
temperature
(ow and return)
Capacity of
central heating
system
Pressure in
central heating
system
[°C] [l] [bar]
85/70 56
1.5
70/55 80
55/45 127
50/40 153
45/35 188
■
A moist central heating system must be ushed
before the boiler is installed.
■ Do not install any shut-off ttings (e.g. valves) at the
safety valve diffuser.
■ The boiler must be installed on a at wall surface.
■The boiler must not be installed in a humid
environment, in a place where there is a risk
of explosion, or in a place where the ambient
temperature may fall below 0 °C.
■All installation work must be carried out with the
power and water supply switched off.
■The boiler is set at the factory for use with a central
heating system. To operate the boiler in conjunction
with a DHW cylinder, the standard setting must be
changed in the extended settings.
■The electrical installation must include surge
protection to protect the sensitive, electronically
controlled heating system from voltage peaks.
■Do not drain the water from the central heating
system after the heating period.
■Leave the controller in standby mode between
heating periods and do not interrupt the power
supply.
DHW heating with a DHW cylinder
A 3-way valve is available for connecting the DHW
cylinder, which must be installed on the outside of the
boiler. The cylinder temperature sensor (accessories)
can be connected to the boiler control unit and
demands heating energy.

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6155049
Connecting the boiler to the central heating system
Preparing for installation
1
Tr
Tos PI – Pressure gauge
ZK – Shut-off valve
RW – Expansion line
NW – Integral expansion vessel
NW1 – Expansion vessel
ZT – Thermostatic valve
ZP – Instantaneous water heater valve
F – Filter
G – Radiator
ZS – Drain valve
TWV – Three-way valve
ZAS – DHW cylinder
Tr – Room temperature sensor
Tcyl – Temperature sensor for DHW cylinder
(WE-019/01)
Tos – Outside temperature sensor (WE-027)
1
Tr
Tcyl
Tos
TWV
The lter must be installed so that the ow direction of the
heating medium matches the arrow on the casing and
the cover is on the bottom of the lter. Filters can be
installed on horizontal and vertical lines. We recommend
installing shut-off valves immediately before and after the
lter to facilitate cleaning or replacement of the lter
element.

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6155049
Assembly and installation
Installation sequence
1. Secure the boiler vertically with xings and ow
and return lines pointing downwards. Maintain
clearances to the wall and ceiling.
2. Connect the boiler to the central heating system
with shut-off valves.
3. Fill the central heating system with treated water
or frost-proof uid.
4. Vent the central heating system.
5. Connect the boiler to the electrical connection.
6. Install and connect the Tr and Tos sensors and
other appliances to the connection points for
external sensors and appliances.
7. After completing the above steps, start the boiler,
select the language on the boiler, run the boiler at
maximum output for 60 minutes, then vent the pump
[Conguration > Pump > Vent].
8. Set the maximum temperature factor in the
installation [Conguration > Central heating circuit >
MAX. power supply temp.].
A Heating return (to boiler) G ¾"
B Heating ow G ¾"
235
A B
min. 150
22
50
716
12
min. 150 min. 60
93
159
64
316
215
50
126
117
Caution
An incorrect electrical connection will result in
damage.
Do not connect the FN, MA, RT, Tcyl, Tos, Tr
inputs when they are supplied with power!
VxN3
400 V
VxN3
230 V

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6155049
Note
A room temperature sensor and an outside
temperature sensor are included in the standard
delivery of model VMN3.
Assembly and installation (cont.)
Installation sequence
Room temperature sensor
Outside temperature sensor

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6155049
Assembly and installation (cont.)
Installation sequence
Removing the side cover
PZ2




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6155049
Assembly and installation (cont.)
Installation sequence
Connection to a single-phase power system
(for 4 kW, 6 kW and 8 kW boilers)
Connection to the three-phase power system
PNL – Terminals for neutral, earth and phase
conductors
1– Temperature limiter
2– Additional conductors
(only for single-phase system) Input Output
PNL – Terminals for neutral and earth conductors
PF – Terminals for phase conductors
1– Temperature limiter
A Main power supply
B Control inputs/outputs and sensors
1
NL
PNL
2
1
NL
PNL
Internal view

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6155049
Selecting the power supply type
Installation sequence
Rated output
12, 16, 20, 24 kW
4, 6, 8 kW
Connection type to
electric system
4, 6, 8 kW Three-phase
Single-phase
If the electrical connection type is congured incorrectly,
e.g. using a single-phase installation at 12, 16, 20 and
24 kW, the conguration fault message "Conguration
fault" appears after commissioning the boiler.
Caution
Do not adjust switches 1 or 2! – Keep factory
settings. Adjust switch 3 according to the power
supply type (1 or 3-phase).
Type VMN3
Type VLN3
MA RT Tcyl
A B
FN MA RT Tcyl Tos Tr
A B

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6155049
Installation sequence
Connecting external sensors and control devices
AProgrammable function input
BMaster appliance
CAlternative room temperature
controller
DTemperature sensor for
DHW cylinder
EOutside temperature sensor
FRoom temperature sensor
GCommunication range
AMaster appliance
BAlternative room temperature
controller
CTemperature sensor for
DHW cylinder
DCommunication range
Type VMN3
Type VLN3
MA RT Tcyl
Tcyl
MA
RT
A B RS 485
A B C
D
FN MA RT Tcyl Tos Tr
Tr
Tos
FN
Tcyl
MA
RT
A B RS 485
A B C D E F
G

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6155049
Connecting external sensors and control devices (cont.)
Installation sequence
FN – Programmable function input
(only type VMN3)
A short-circuited FN contact caused by an external
appliance will lead to specic boiler behaviour,
depending on the input conguration [Conguration >
FN input]:
■ Maintain the frost protection temperature
regardless of the set room temperature
■ Maintain a comfortable temperature regardless
of the set room temperature
■ Charge the buffer cylinder with limited user
intervention outside the schedule (integration
of boiler and PV installation).
MA – Master appliance
To limit power consumption, boiler operation can be
made dependent on other collectors, such as the
DHW cylinder. To do this, it must be connected to the
MA N/C contact to activate the main current receiver
and open the contact. This blocks the boiler's heating
operation and stops the DHW circulation pump.
RT – (alternative room temperature controller,
type VMN3)
Optional control of boiler operation depending on
current room temperature. The RT input must be
activated [Conguration > Room temperature > RT],
which causes the oating RT contact switches of the
central heating to short circuit. If the RT input is
activated, the room temperature controller integrated
in the boiler is switched off. We recommend using the
temperature sensor set at the factory in conjunction
with the integrated room temperature controller for
the boiler.
RT – (alternative room temperature controller,
type VLN3)
Control of boiler operation depending on room
temperature. An RT short circuit leads to central heating.
The room temperature controller (RT) must be installed
in a room typical of the building and as far away as
possible from radiators, windows, doors and
passageways. If the contact is not live, the controller
opens when the required room temperature is reached.
Tcyl – Temperature sensor for DHW cylinder
The water temperature sensor in the DHW cylinder
must be positioned in the cylinder connector.
Tos – Outside temperature sensor (only type VMN3)
The sensor must be installed in a dark location on the
north or north-west façade of the building and away
from windows and fans. The temperature sensor cable
must be as short as possible and must not be routed
in the immediate vicinity of power cables.
Tr – Room temperature sensor (only type VMN3)
The room temperature sensor must be installed in a
room typical of the building and away from radiators,
windows, doors and hallways.
RS485 – Communication range
Terminals for additional heating circuit controllers.
PUMP.C – DHW circulation pump
Controls the DHW circulation pump in the daily/weekly
schedule. The function must be activated
[Conguration > Circulation > YES].
TWV – three-way valve control
(central heating/DHW)
Changes boiler operation over to central heating or
DHW heating in the heating coil of the DHW cylinder
by means of a three-way isolating valve with
servomotor. Depending on the model used
(SPST or SPDT control), the appliance must
be connected as shown in the illustrations.
SPST control
SPDT control
M.SUPPLY TWV
L N PE LB LA N
Control
N
Note
To activate the DHW function as described in
Service/Conguration – Cylinder.
Caution
An incorrect electrical connection will result in
damage.
Do not connect the FN, MA, RT, Tcyl, Tos, Tr
inputs when they are supplied with power!
TWV
LB LA N
LA
LB
N
AMains supply to main PCB
BDHW circulation pump
CThree-way valve control
(central heating/DHW)
DInternal pump
EPWM signal for internal pump
M.SUPPLY PUMP.C TWV PUMP
L N PE L N PE LB LA N L N PE
PUMP
O G I
L N PE
A B C D E

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6155049
Installation sequence
Extending the system with additional heating circuits (only for type VMN3)
If the system needs to be extended with additional
heating circuits, the VMG3 heating circuit modules
must be used. Depending on the conguration of the
heating system, the boiler will operate in the following
modes [Conguration > Operating mode]:
■
Basic – in the case of boiler heating, the VCMG3
heating module(s) receive(s) the command to control
the temperature in the circuit. A heating installation is
shown below for illustration purposes.
The circuit controlled by the heating module operates
according to the boiler control schedule, but with its
own heating curve or manual settings.
■
Heat source – schedules are set individually in
each module. For VCMG3 heating modules, the
heating source (boiler) must be switched on.
Thanks to the above function, it is possible to install
a heating system consisting of several independent
work processes (each with its own schedule and
temperature settings). An example installation
scheme is shown below.
■
Buffer cylinder – the buffer cylinder is lled by the
boiler according to its own schedule, while the
heating modules drain the buffer according to their
own schedule.
VCMG3
VMN3
Tos
Tr
VCMG3
VCMG3
VMN3
Tos
Tr
VCMG3
VCMG3
VMN3
Tos
Tr
1
1– Buffer cylinder

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6155049
Installation sequence
The heating circuit module (control) is a temperature
controller for the heating medium in the system. It is
equipped with a mixing valve with a servomotor. By
mixing the heating medium in the installation inlet
with the medium from the second heating source, it
is possible to reach the required temperature at the
valve outlet (circuit inlet).
The process is controlled by gradually opening and
closing the valves at specied time intervals. The valve
is controlled by applying the voltage to terminal Lo(open)
or Lc(close).
Caution
If the temperature of the heating medium is too
high, it will damage the system. The installation
of safety valves prevents excessive heating of
the heating medium.
The drawings in these instructions are for illustration
purposes only and are simplied – they do not contain
any hydraulic ttings.
This appliance can be used by children aged 8 years or
older and by persons with restricted physical, sensory
or mental capacities or without sufcient experience
and knowledge of the appliance's operation, provided
that they are supervised or instructed in the safe use of
the appliance and are fully informed about the potential
hazards arising from its use. Never permit children to
play with the appliance. Children must not carry out
cleaning and maintenance work if unattended.
Description(only for type VMN3)
AFeed ~230 V
BRS485
ZM Mixing valve with servomotor
To Temperature sensor, heating circuit
PO DHW circulation pump
M
To POZM
VCMG3
A
B

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6155049
Installation sequence
The control unit exchanges information about
operating parameters with the master appliance
(boiler). Conguration parameters are set in the
conguration menu.
To connect the control unit to the master appliance,
a unique identication number must be assigned
(see section 4.2 in conguration mode).
If several control units are working directly with the
boiler, each must have its own unique identication
number.
A jumper must be installed at the MA input. Opening the
input blocks heating processes, the valve remains closed.
This input can be used to block heating processes via
other appliances. Note: The MA input is isolated from the
power supply and can only be closed and opened.
The outside and room temperature sensors must
be connected to enable correct operation of the
module.
Connection(only for type VMN3)
To connect an appliance to the bus (computer), a
"point to point" connection topology must be used
according to the diagram below.
Connection to other appliances must be made with the
cable (UPT-Cat. 5e 4 ×2 24 AWG). It is not permissible
to connect system elements in a star topology.
L N PE PE L N N LoLc
A
A
D
D
E F
B
C
B
ABus (computer)
BCircuit temperature sensor
CMaster appliance or terminal
DFeed ~230 V
EPump
FValve

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6155049
Installation sequence
Figure 5 shows an overview of the control panel
with signal elements (display, indicators) and
control elements (buttons).
The control unit operates in three operating modes:
■
"Operating" mode: Depending on the conguration,
settings and external parameters, the appliance
operates according to the control algorithm in the
opening phase of the mixing valve, so that a set
inlet temperature is reached in the circuit.
■"Standby" mode: Operating mode used outside the
heating period. The mixing valve is closed and the
pump is switched off. Once a day, according to the
periods set by the user (protection period for the
pump), the pump is switched on and the mixing
valve is opened and closed to prevent blockage
in the appliance during a long standby period.
■ "Conguration" mode: Operating mode for setting
the module's conguration parameters.
Operating modes are set via the master appliance
(boiler). Manual settings made from the control panel
are changed by the system to the currently required
settings after 30 seconds of keyboard inactivity. The
operating mode is selected using the buttons on the
control panel, as shown in Figure 6.
Using the control panel (only for type VMN3)
ADisplay
BCommunication display
CTemperature display
DHeating display ON
E Display for parameter settings or
manual settings
F, Gand HOperating buttons
AC
F
E
B
D
G
H

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6155049
Installation sequence
Using the control panel (cont.)
"Standby" mode
"Standby" mode: Operating mode used outside the
heating period. The mixing valve is closed and the pump
is switched off. Once a day, according to the periods set
by the user (protection period), the pump is switched on
and the mixing valve is opened and closed to prevent
blockage in the appliance during a long standby period.
"Standby" mode appears on the display (A) via a
regular notication .
You can switch from standby mode to "Conguration"
or "Operating" mode.
To call up "Conguration" mode, press both buttons
simultaneously until notication appears
on the display. Once the notication appears, the
appliance conguration can be changed. To switch
from standby mode to "Operating" mode, press button
and wait until notication appears on the
display. When button is released, the appliance is
in "Operating" mode.
Configuration mode
Stand-by mode
Operating mode
5 sec.
position
5 sec.

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6155049
Installation sequence
"Conguration" mode
To call up "Conguration" mode, press both buttons
simultaneously (for 5 seconds) in standby mode.
Once the notication appears on the display, the
appliance is in "Conguration" mode.
The parameter can be changed by pressing buttons
and the parameter value can be changed by
pressing button . A ashing display indicates
that the relevant parameter is being edited. Once
parameter has been edited, press button
to accept the parameter value.
Figure 7 shows the structure of the conguration
menu.
Using the control panel (cont.)
Reciever type
Circuit’s maximal supply temperature
Running time of the valve
Regulation time of the valve
Pump’s operating mode
Manual setting of circuit’s temperature
Device’s ID number
End
Stand-by mode
Stand-by mode