Viessmann Vitotron 100 Quick guide

Installation and Service
Instructions
VITOTRON 100
5472 726 - 02 08/2022
For use by heating contractor
Please file in Service Binder
Read and save these instructions
for future reference.
Product may not be exactly as shown
IMPORTANT
Vitotron 100 VLN2
Models 04 to 14.4
Wall-mounted electric space heating hot water heater
Heating input: 13.6 to 49.1 MBH
4.0 to 14.4 kW

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Safety Instructions .....................................................3
Space Heating Hot Water Heater Ratings and
Specification.......................................................... 4
Space Heating Hot Water Heater Mounting Clearances....5
Piping Arrangement....................................................6
Sizing the Space Heating Hot Water Heater ...................7
Designed Temperature Differential ..............................7
Circulating Pump Information ......................................7
Plumbing Installation Guidelines ...................................8
Electrical Installation.................................................10
Control Panel ...........................................................12
Heating Mode / Initial Start-Up ...................................13
Winter Mode (Heating Mode) .......................................13
Summer Mode (Stand-by Mode)....................................16
Advanced Settings ...................................................17
Troubleshooting .......................................................18
Care and Maintenance ..............................................18
General Space Heating Hot Water Heater View ............19
Parts List.................................................................20
Space Heating Hot Water Heater Parts........................21
Instructions for the Installer
Instructions for the User
Page
Table of Contents
This appliance is not intended for use by persons
(including children) with reduced physical, sensory or
mental capabilities or lack of experience and knowledge,
unless they have been given supervision or instruction
concerning use of the appliance by a person responsible
for their safety. Children should be supervised to ensure
that they do not play with the space heating hot water
heater appliance.
Consider all piping and electrical connections before
selecting space heating hot water heater location.
Failure to follow the instructions in this manual could
result in severe personal injury, death or property damage.
IMPORTANT

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service Instructions for the Installer
Safety Instructions
8. This space heating hot water heater is equipped
with a 194°F manual reset safety high limit device.
The reset button is clearly located in the center of
this device.
9. This space heating hot water heater will not operate
below a 7 psi water pressure level.
10. This space heating hot water heater is equipped
with a Wilo circulator pump. After thermostat
temperature set point has been reached the pump
will continue to circulate water for 3 additional
minutes as part of a post purge sequence to push
heated water away from heat exchanger.
11. This space heating hot water heater is equipped
with a differential pressure relief bypass valve.
It allows the system to keep minimal flow of
heating water through the space heating hot water
heater and reduce noise in the installation when
equipped with thermostatic zone valves.
12. Do not drain the water from the space heating hot
water heater after the heating season.
13. In summer do not shut off the power supply (120VAC
and 240VAC) and leave the controller in stand-by
(summer mode) between the heating seasons.
The space heating hot water heater is equipped with
an exercise timer control feature that allows the
circulating pump to operate 15 minutes each day and
will ensure longer operation the circulating pump and
will help to eliminate the buildup of debris. (See
section “Summer mode (stand-by mode)”on page 11).
14. Space heating hot water heater is pre-set by the
manufacturer to work with hydronic radiant floor,
radiant ceiling, hot water baseboard and water to air
heat applications. Temperature adjustments can be
made on control panel to meet these applications
requiring desired water temperatures between 85° -
140°F.
1. Read and strictly follow the installation and operating
instructions to ensure a longevity and reliable space
heating hot water heater operation.
2. This manual provides general installation guidelines.
Your installation must comply with ALL applicable
local codes.
3. Always have a qualified electrician perform
electrical wiring. Manufacturer will not be held
responsible for faulty installations which are performed
by unqualified electricians. An efficient electrical
installation which has been completed in accordance
with the binding norms of electric installation.
Electric installation should be equipped with electric
circuit breakers and other solutions which will ensure
disconnecting the space heating hot water heater
from the source of power.
4. All installation work must be performed when the
power and water supply is disconnected from the
main electrical panel.
5. This space heating hot water heater must be installed
vertically and on an even wall surface with access to
plumbing connections on bottom.
6. Any associated components (i.e. space heating hot
water heater, water tubing, valves, manifolds etc...)
must be flushed before space heating hot water
heater installation.
7. This space heating hot water heater is equipped with
a safety relief valve. Do not install any barrier fitting
or valve on the outlet of the safety valve. Connect
and extend cin. copper piping from relief valve and
terminate at least 6 in. from the floor or floor drain.

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Instructions for the Installer
Space Heating Hot Water Heater Ratings and Specifications
Space Heating Hot Water
Heater Model
VLN2 04 VLN2 06 VLN2 08 VLN2 12 VLN2 14.4
Space Heating
Hot Water Heater
Rated Power
kW 4 6 8 12 14.4
Btu/h 13,652 20,478 27,304 40,956 49,147
Voltage V 240
Rated Current A 16.66 25.0 33.3 50.0 60.0
Breaker Quantity-
Amps
A1@
30 amp
1 @
40 amp
1 @
50 amp
1 @
60/70 amp
1 @
80 amp
Heating Elements Quantity 3
Element Resistance
/ each
Ω43.3 28.8 21.6 14.4 12.0
Circulating Pump - Wilo Star S 21 U 15. 3 speed
Circulating Pump
Voltage
V 120V, 60Hz
Circulating Pump
Amps
A .97
Speeds 3
Fuse Rating 2.0 amp
Operating
Temperature Range
°F 85° - 140°
Inlet / Outlet
Pipe Thread
G cin. (Internal Thread)
Expansion Vessel
(14 psi)
Gallon 1.6
Safety Relief Valve
Rating
psi 30
Maximum Pressure psi 30
Minimum Pressure psi 7
Weight Lbs. 68.5
Dimensions
L x W x D
Inches 28 x 17 x 97/8
Minimum Flow Rate gpm 1.1 1.32

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service Instructions for the Installer
Space Heating Hot Water Heater Mounting Clearances
After reading instructions, please keep this manual with
the space heating hot water heater for future reference.
Affix the plastic holder to the outside of the space heating
hot water heater and insert manual in this pocket.
IMPORTANT

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Piping Arrangement
Instructions for the Installer
Typical radiant floor heating application
1Space heating hot water heater
2Additional expansion tank - if needed
Space heating hot water heater piped in a primary/
secondary (P/S) configuration. Consider P/S when higher
flow rates are necessary and when the space heating hot
water heater meets the intended heatloss of the hydronic
system.
1Space heating hot water heater
2Additional expansion tank - if needed
3Low loss header

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Sizing of the Space Heating Hot Water Heater
Instructions for the Installer
It is very important to conduct a heatloss analysis of
the intended heated space. Select the space heating hot
water heater size in kW based on its Btu/hr. rating that
best meets the designed heatloss.
It is important not to overly exceed the kW sizing as
this will lead to unnecessary costs of space heating hot
water heater, wiring and materials. Consequentially it is
extremely imperative NOT to undersize the space heating
hot water heater.
How to choose the correct space heating hot water heater
size? Convert BTU to kW by dividing the BTU load by
3,413.
(Ex. 33,513 BTU / 3,413 = 9.81kW). Choose a space
heating hot water heater that slightly exceeds this kW
requirement by no more than 20%.
For larger BTU loads consider cascading the space
heating hot water heaters together and pipe the system
in a parallel configuration as described in the piping
arrangement section.
Note: that utilizing propylene glycol freeze protection will
reduce the heat transfer and cause the system to
be less efficient. Under no circumstance should
more than a 50/50 ratio of water to propylene
glycol be used. Consult with radiant system
designers for required freeze protection guidelines.
Designed Temperature Differential
Radiant floor heating systems are typically designed for a
10°- 20°F temperature differential determined by when
the heating fluid leaves the space heating hot water
heater and where it enters the radiant heat source. i.e.
radiant PEX/tubing.
Circulating Pump Information
This space heating hot water heater is equipped with
a Wilo Star S 21 U 15, 3 speed circulating pump. To
determine the speed or setting of the pump, confirm with
radiant design completed by others and or complete a
pressure-loss calculation.
Refer to calculations of loop lengths to determine proper
speed. The pump will automatically operate based on a
thermostat call for heat. After the thermostat temperature
set point has been reached, the pump will continue to
circulate water for 3 additional minutes as part of a post
purge operation to push heated water away from the heat
exchanger.
This space heating hot water heater is also equipped
with an additional pump relay. This will aid the installer if
there is any need to pipe the systems with a secondary
circulating pump to overcome pressure drop due to piping
or hydronic tubing design.
This is commonly referred to as primary/secondary
applications described in the piping arrangement section.

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Plumbing Installation Guidelines
Instructions for the Installer
1. Remove outer screws at the bottom and at the top
of space heating hot water heater and carefully open
the front cover.
2. The space heating hot water heater is wall hung
and must be installed in a vertical position where
plumbing connections are located at the bottom.
Utilize key holes slots to hang the space heating hot
water heater. Refer to diagram on clearances (page 5).
3. The space heating hot water heater is provided with
a 3/8 in. air vent located on top of the heat
exchanger. It is designed to collect and remove air.
Ensure plastic drain tubing remains in place and exits
the space heating hot water heater in the lower right
corner.
4. The space heating hot water heater is equipped with
a pre-charged flat expansion tank located on the back
housing of the space heating hot water heater.
Expansion tank has a Shrader valve, which location
is shown on the figure. This figure presents the
bottom view of the space heating hot water heater.
Access to the valve is only from the bottom of the
space heating water heater. From there it can be
connected any pressure gauge to check the pressure
or pump to refill the air inside the tank.
5. The space heating hot water heater is equipped with
an ASME approved 30 psi automatic safety pressure
relief valve. Install the necessary length of cin.
copper piping from the relief valve to within 6 in. of
the floor to prevent personal injury or water damage
to surrounding area.
6. Observe inlet return piping (blue) and outlet supply
feed piping (red) connections. Install full way shut
off valves below inlet and outlet connections before
plumbing the space heating hot water heater to the
hydronic heating system.
DO NOT reverse these connections to the radiant
supply and return manifolds. Optional temperature
or pressure gauges can be installed below the space
heating hot water heater if desired.
7. Install a space heating hot water heater drain valve(s)
as necessary to aid in filling, purging and draining of
unit and the related system components.
8. Water supply feed or pressure reducing valve can
be installed to comply with local building codes.
Local codes may require a back flow preventer called
a check valve when installing a fixed domestic water
supply line to the space heating hot water heater.

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Plumbing Installation Guidelines (continued)
Instructions for the Installer
9. When possible, fill the space heating water heater
and hydronic system with treated water. (i.e. soft or
distilled water) This will substantially extend the life
of the heating elements and reduce sediment buildup.
10. Freeze protection additives can be added. Only use
propylene glycol type freeze protection products for
hydronic heating systems that are non-toxic and
corrosion resistant.
The propylene glycol mix shall not exceed 50%, by
volume.
Under no circumstance should methanol or
ethylene glycol (automobile antifreeze) be added
to the space heating water heater system as this may
damage internal components.
11. Insure purging of all air throughout space heating
water heater system and related components.
12. This space heating water heater requires a minimum
pressure of 7 psi in order to operate. Pressure levels
for hydronic systems typically are above the pre-
charged expansion tank pressure level (12 psi).
If additional pressure gauges are installed verify
reading as described on item 7.
13. The space heating water heater is equipped with a
pressure differential bypass valve. This allows the
minimum flow rate to pass through the space
heating water heater when all zone valves are closed.
The valve will also help reduce noise issues upon
closing of zone valves or actuators.
To adjust:
Turn differential bypass valve clockwise until it stops.
Turn on all heating zones and let them heat for a
couple of minutes.
Caution! piping can get hot quickly upon opening
the valve. Slowly open the bypass valve by turning
in a counter clock wise direction.
Stop turning once an increase in temperature is felt
on the outlet side of the valve. This is referred to the
tipping point. After reaching the tipping point continue
to turn the valve one complete turn. The valve is now
set to bypass excess flow as zone valves close.
Set the thermostats to normal set temperatures.
14. Proceed to the Electrical Installation.

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Electrical Installation
Instructions for the Installer
For supply connections, use 10 awg or larger wires
suitable for at least 167°F (75°C)
1. All electrical work should be completed in accordance
to local or state electrical and building codes.
2. This space heating water heater must be electrically
grounded in accordance with National Electrical Code
ASNI/NFPA70, or local codes.
3. This space heating water heater operates with
240VAC single phase electrical power source.
4. Connect the space heating water heater to the
electrical service using COPPER WIRE ONLY.
Tighten connections by using a 3/16 in. Hex key tool.
Conform to local electrical codes for correct sizing of
electrical breakers and size of electric conductor wires.
Refer to space heating water heater nameplate for
current and kW ratings. Local electric codes may
require an electrical disconnect.
Electrical Wiring Diagram

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Electrical Installation (continued)
Instructions for the Installer
5. The circulating pump requires a separate 120VAC,
15 amp electrical circuit. Utilize bin. electrical
knockout as marked on the left side of cabinet to
access circulating pump wiring connections inside
space heating water heater. Do not combine the high
voltage power for circulating pump with any
thermostat or off peak low voltage wires.
An optional secondary pump can be installed in the
system for hydronic applications plumbed with multiple
circulators and or primary/secondary applications.
Utilize the Pump 2 connections to operate the
secondary pump. The secondary pump will
automatically turn on upon closure of thermostat
connections on control panel. Spare fuses are taped
into the inside cover.
Fuses specified as:
Time-delay Glass Fuse 6.3 x 32 mm 2A.
6. Thermostat - This space heating water heater can
be signaled to turn on from a standard two wire
thermostat, end switches of an actuating valve or a
zone control panel. These connections should all be
voltage free (dry contact). Extend wires from
thermostat to TT connections on control panel using
2 x 18 gauge wires. Utilize b” electrical knockout
to left side of control panel to gain entrance to this
connection. Install thermostat in a location where it
will not be influenced by other heat sources.
7. Off peak control (optional) -This space heating water
heater is equipped with a connection (normally
closed) to receive a utility signal for off peak denoted
by OP on the control board. Ensure the
interconnection from utility radio receiver is voltage
free (dry contact). Consult with local utility on
questions with off-peak installations. Keep blue/white
jumper wire in place if not connected to a utility radio
receiver.
8. Outdoor compensation - The space heating water
heater can utilize an outdoor sensor for outdoor
compensation capability. Install the outdoor sensor
preferably on the north side of the building. Keep the
outdoor sensor away from any sources of heat.
Refer to Advanced Settings on page 14 to set proper
heat curve. If no outdoor sensor is wired to the Text
terminals on the control panel, the space heating
water heater will work in normal operation
9. Final check. Verify all electrical connections are tight.
Loose connections can cause premature failures of
electrical components. Once you have finished the
above procedures and before starting the space
heating water heater, understand the control buttons
and indicators on the control panel in the following
page.
10. Re-fasten the screws on bottom (2) and top (1) to
hold front door in place.

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Control Panel
Instructions for the User
The control panel allows the user to identify flow rate
(GPM),the inlet and outlet operating temperatures and
the Btu/h of the space heating water heater at any given
time. It will also aid in identifying any faults, which may
occur, by displaying the fault codes.
Indicators
X 100 Btu/h = British thermal units per hour
psi = Pounds/Square Inch, pressure level
gpm= Gallons/minute or Flow rate
F° = Temperature (Fahrenheit)
Buttons
= Space heating water heater power
= Up and down selection
= Scroll option
Failures indication
Indicator Status Details
EEE Message on electronic display Data record error
Parameter out of range or a failed temperature sensor
The control panel consists of two working areas: the
signaling area and control buttons. The user can select
the following working modes: winter mode (heating mode)
or summer mode (stand-by mode). Utilize the push button
arrows to scroll through the different working parameters
of the space heating water heater. The control panel
will automatically switch to main view if no buttons are
pressed within 1 minute. After learning the indicators
proceed to initial startup section.

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Winter Mode (Heating Mode)
Instructions for the User
Heating Mode / Initial Start-Up
3. If 120VAC power is connected to the circulating
pump, turn control panel on and utilize push
buttons to scroll to psi indicator. Disconnect
thermostat wiring connection below control panel.
This will insure space heating water heater will not
operate. If pressure is below the 7 psi level the
circulating pump indicator will blink. Verify pressure
(psi) reading on control panel to achieve desired
pressure levels. Typical pressure readings should be
slightly above the 12 psi expansion tank reading or
higher depending on application (15-20 psi
recommended).
4. For testing, turn the thermostat above the room
temperature reading. This will turn the space heating
water heater on. After testing return the thermostat
to a comfort setting.
5. To automatically return to main viewing mode
momentarily press the power button. The
controller will switch over to the main view if you
don’t push any of the buttons for 1 minute.
1. To set in the heating mode press the power button.
The indicators will show the current working mode
of the space heating water heater.
2. Set the supply water temperature (SWT) set point.
Utilize the right arrow push button to scroll
through working parameters of the space heating
water heater. Highlight the SWT symbol and
utilize the up and down arrows to select the
temperature that meets hydronic radiant heating
application. The supply water temperature can be set
between 85° - 140°F. Notice the °F symbol will
light up at the same time when changing temperature.
To set in the heating mode press the power button. The indicators will show the current parameters of the space
heating water heater (see control panel).
MAIN VIEW
INDICATOR STATUS DETAILS
Heating Status
on Thermostat is calling for heat
off Room set temperature has been reached/ no call for heating
blinks Off Peak load control or master appliance mode.
Outdoor temperature reached a thermal cut - off valve (see parameter 5 in advanced settings).
Circulating Pump Indicator
on Pump is active, proper flow rate of water has been reached
blinks Lack of water flow or insufficient flow of water heating elements off
Supply Water Temperature
red light Space heating water heater is in heating mode
green light Supply water temperature has been reached in the space heating water heater
off Heating is off
Outlet Temperature
°F
Temperature on the outlet of the space heating water heater

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Winter Mode (Heating Mode) (continued)
Instructions for the User
SUPPLY WATER TEMPERATURE VIEW
INDICATOR DETAILS
°F
The LED in the first location on the display indicates automatic setting, according to the
heating curve and offset (see parameters 4 and 5 in advanced settings). This is active
only when the outdoor sensor is wired to Text terminals on control panel.
Manual setting (see parameter 4 in advanced settings), outlet temperature can be set
manually in range 85 - 140°F.
Use buttons and to change the parameter.
INLET TEMPERATURE VIEW
°F
Inlet temperature
OUTLET TEMPERATURE VIEW
°F
Outlet temperature
FLOW VIEW
gpm
Flow rate [gallons/min.]
PRESSURE VIEW
psi
Pressure level [pounds/square inch]
ENERGY CONSUMPTION VIEW
X100
BTU/h
Current energy consumption [BTU/h]
OUTDOOR TEMPERATURE VIEW
°F Outdoor temperature. In case of lack of outdoor temperature sensor, preview is not available

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Winter Mode (Heating Mode) (continued)
Instructions for the User
To use the outdoor compensation option refer to outdoor
compensation graphs on page 14. The outlet temperature
is adjusted depending on the outdoor temperature.
For example, if it’s cold, the outlet temperature should
increase, but if outdoor temperature is warmer, the
outlet temperature should be adjusted lower. Outdoor
compensation option is based on heating curves (see
“Advanced Settings”).
User can choose from one of the 9 curves available,
declaring the desired thermal efficiency of the space
heating water heater.
One method of selecting the correct curve is as follows.
The first step is to determine the temperature on the
horizontal axis (outside temperature from 0°F to 70°F),
which at the present time most frequently occurs, for
example 30°F.
Then run in a straight line up to the height on the value
of the temperature on the vertical axis which we want to
obtain in the hydronic system. In our example, at 30°F
outside the building we want to have 115°F for the
heating (see the diagram on page 14), so we get exactly
the heating curve defined as 4. If the intersection point of
selected temperatures is not placed on the curve, we
choose the closest. For example, 30°F outdoor
temperature, and the desired 110°F for hydronic system
can lead to a selection of curve 3 or 4. It should be
checked periodically, whether the choice was correct,
if not - another curve should be used.
The heating curve offset
If in wide range of outdoor temperatures the space
heating water heater is not able to maintain the desired
indoor temperature (it’s too cold or too warm), the heating
curve chosen before should be shifted (offset in range
-9°F to +9°F available in options on control panel). If the
indoor temperature is too warm - the heating curve should
be shifted down and vice versa (refer to the diagram on
page 14).
Special start-up procedure (when the system is filled with
an antifreeze solution)
A flow rate reading error may occur if you start-up the
unit at low ambient temperature. This error may occur
because the physical properties of antifreeze solution.
If the indicator flickers and the cut-off valves are
opened you have to close OP and TT contacts which will
automatically start the special start-up procedure.
As a result, the medium will be warmed up to temperature
that enable you to read the flow rate correctly.
The duration of procedure depends on both the installation
capacity and the temperature inside the installation.
When a control panel display shows selected parameters
alternately and marks („-”, „--”, „---”) it means that
the procedure is started. The procedure will close
automatically and the unit will start normal operation once
the minimal flow rate is reached.

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Summer Mode (Stand-by Mode)
Instructions for the User
Do not shut off the power supply between heating
seasons. To set the space heating water heater to
summer or stand-by mode press and hold power
button for 3 seconds.
When the control panel is switched to summer mode the
control panel is off and the stand-by mode indicator
remains blinking. In this mode the space heating water
heater is off but the pump is activated every day for 15
minutes.
This summer mode protects the space heating water
heater and the hydronic heating installation from being
blocked and silted up. The pump will run every day at
the same time when the space heating water heater is
switched to summer mode. For example, if you turn the
space heating water heater to “stand-by” mode at 6 p.m.
the timer will activate the pump every day for 15 minutes
starting at 6 p.m.
To set the space heating water heater back to winter
heating mode press and hold power button for 3
seconds.
Note: In summer mode, based on U.S. national electric
rates of $.10/kWh the cost of operating the
circulating pump for 15 minutes/day will equate to
approximate usage of $.08 / month on the highest
speed.
MODE VIEW
INDICATOR DETAILS
The control panel is off and the stand-by mode indicator (dot) blinks only.
PRESSURE VIEW
psi
Pressure level [pounds/square inch].
To check out the installation pressure press or
STATUS PUMP VIEW
Circulation pump is active. In summer mode (heating elements turned off).
The circulating pump will operate for 15 minutes, once every 24 hours each day.
IMPORTANT

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Advanced Settings
Instructions for the User
For advanced settings switch the control panel to stand-by
mode. First press and hold power button for 3 seconds
and release. Then press and hold the button, and
immediately press the power button .
To select parameter press: , , or buttons to
enable you to change the values.
Press and hold the power button to exit and save the
settings.
Parameters Indicator/display Status/value Details
1
4-14
Space heating water heater power - enter the power amount (kW)
as indicated on identification label.
This value is factory preset.
2
A/n Working mode of pump – PA = (automatic), Pn (manual –
continuous duty of pump).
3
1, 2, 3 Maximum quantity of active heating elements.
4psi off/on Installation pressure control
5
°F 30-70 Outside temperature above which space heating water heater will
not heat, in case of space heating water heater’s failure or lack of
outside temperature sensor, function is not active
off Function not active
61-9 Selection of heating curves (see diagram “Outdoor compensation”)
0Manual setting of outlet temperature
7
-9 +9 Offset of heating curve characteristic [°F]
(see diagram “Offset for outdoor compensation”)
8Space heating water heater working time counter in hours
Offset for outdoor compensation
Outdoor compensation

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Troubleshooting
Instructions for the User
Failure to service properly may lead to further damage to
components.
Symptom Reason Action
All indicators on control
panel are OFF
No power to space heating water
heater
Check for 240 VAC on space heating water heater
main connection terminals
Reset manual safety high limit
Contact authorized service person
“PSI” indicator blinks Insufficient pressure below 7 psi Switch the controller to pressure view and increase
system pressure above the minimum required 7 psi level.
Pressure sensor failure Switch the controller to pressure view, if display
shows - - Contact authorized service person
“GPM” indicator blinks Pump is blocked Unblock the pump-unscrew the screw on pump
housing and move the pump rotor manually
Heat does not circulate through
the space heating water heater
– space heating water heater is
blocked
Air bubble is caught in system, purge the installation,
pump and space heating water heater
Check 1 amp fuse on control panel
Failure of pump or flow sensor Check power supply for circulating pump
a failure of pump or flow sensor Contact an authorized service or the seller
Circulator indicator blinks
Lack of water flow - 2.1 GPM min Adjust flow characteristics as needed
“Heating status” is off
No thermostat connection Insure thermostat is calling for heat and is above
ambient temperature set point
Verify connections on thermostat
Failure of control board Check fuse on control panel glass fuse 6.3 x 32 mm 2A
“Heating status” blinks
Off Peak signal = no heat Electric utility off peak control
and “Inlet temp.” blinks
A failure of inlet temperature
sensor, space heating water
heater in failure condition
Check connection or replace thermistor sensor
and “Outlet temp.” blinks
A failure of outlet temperature
sensor or loose connection
Check connections
Replace HC-DN 15 sensor
Space heating water
heater does not heat
Failure of cylinder temperature
sensor
Contact authorized service person for replacement of
cylinder temperature sensor or thermostat
A failure of control panel Contact authorized service person
EEE message on display Data record error Contact authorized service person
Insufficient heat output Heating elements Check for resistance on elements
Control panel set up failure Insure control panel is set up for correct kW and
number of heating elements through advanced settings
Care and Maintenance
1. In order to protect flow sensor located within the
space heating water heater, it is imperative that the
pre-installed magnetic filter is removed and cleaned
at least annually. Failure to clean out this filter could
increase contamination of the space heating water
heater by system residue.
Do not attempt to service this space heating water heater
unless you have been trained in all aspects of its functionality
and methods to repair.
2. Periodically check system pressure.
Contact authorized service person to make
adjustments only.

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
General Space Heating Water Heater View
Instructions for the User

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Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Part List
Instructions for the User
Legend
1 Wiring Entrance
2 Control Panel
3 Pump
4Pressure Relief Valve
5 Pressure Sensor
6 Magnetic Filter
7 Manual Reset High Limit Device
8 Heating Element
9 Flow and Outlet Temperature Sensor
qP By-Pass Valve
qQ Water Inlet
qW Water Outlet