STIEBEL ELTRON SB 300 E Instruction Manual

OPERATION AND INSTALLATION
FUNCIONAMIENTO E INSTALACIÓN
MODE D’EMPLOI ET INSTALLATION
.ĉ®êļ¼ŒùźÐļ¼®ŷ|Œ¼ļä¼|Œ¼ļŷêŒä¼ù¼Œļê|÷şĤä¼|ŒêĉÖ¼ù¼ă¼ĉŒ
|ù¼ĉŒ|®Ēļ®¼|Öş||Ïş¼ÖĒêĉ®êļ¼ŒĒĒĉ|ù¼ĉŒ|®Ēļ¼ù½ŒļêĒ®¼ļ¼Ïş¼ļſĒ
ä|şÏϼé¼|şä|şÏÏ|Ö¼êĉ®êļ¼Œ|Ŷ¼½ù½ă¼ĉŒ®¼ä|şÏÏ|Ö¼½ù¼Œļêış¼|şŹêùê|êļ¼
» SB 300 E
» SB 400 E
Conforms to ANSI/UL Std. 174
Certified to CAN/CSA Std. C22.2 No. 110-94
Conforme a ANSI/UL Std. 174
Certificación con CAN/CSA Std. C22.2 No. 110-94
Conforme à la norme ANSI/UL Std. 174
Certifié à la norme CAN/CSA Std. C22.2 No. 110-94
Tested and certified by WQA to NSF/ANSI372
for lead free compliance.
Probado y certificado por WQA NSF/ANSI 372 para
el cumplimiento de las regulaciones sin plomo.
Testé et certifié par WQA à la NSF/ANSI 372 pour
une utilisation sans plomb.

2|SB 300-400 E www.stiebel-eltron-usa.com
CONTENTS
SPECIAL INFORMATION
OPERATION
1. General information ____________________________________3
2. Safety_____________________________________________________3
2.1 Intended use_________________________________________________3
2.2 Incorrect use_________________________________________________3
2.3 General safety instructions _______________________________3
2.4 Heat exchanger loop _______________________________________3
2.5 Test symbols _________________________________________________3
3. Register your product __________________________________4
4. Appliance description __________________________________4
4.1 Heating the DHW tank _____________________________________ 4
5. Using the electric heating element____________________4
6. Maintenance and care __________________________________4
6.1 Temperature / pressure relief valve_____________________5
6.2 Decalcification_______________________________________________5
6.3 Replacement of the sacrificial anode ___________________5
7. Plumbing troubleshooting _____________________________5
7.1 Notifying a qualified contractor _________________________5
7.2 Safety label __________________________________________________ 6
8. Safety_____________________________________________________6
8.1 General safety instructions _______________________________6
8.2 Instructions, standards and regulations _______________ 6
9. Preparations _____________________________________________6
9.1 Transport _____________________________________________________6
9.2 Storage________________________________________________________7
9.3 Delivery configuration _____________________________________7
9.4 Installation site______________________________________________7
9.5 Siting the appliance ________________________________________ 7
10. Installation_______________________________________________8
10.1 Water connection ___________________________________________8
10.2 Heating connection_________________________________________ 9
10.3 Power supply ________________________________________________9
11. Commissioning ________________________________________ 10
11.1 Commissioning____________________________________________ 10
11.2 Recommissioning_________________________________________ 10
12. Shutting down_________________________________________ 10
13. Electrical Troubleshooting ___________________________ 10
13.1 Resetting the high limit safety cut-out _______________ 11
14. Maintenance and cleaning ___________________________ 11
14.1 Removing the heating element cover_________________ 11
14.2 Draining the tank _________________________________________ 11
14.3 Descaling the electric element_________________________ 11
14.4 Valves _______________________________________________________ 11
14.5 Replacing the electric element cover _________________ 11
15. Specifications__________________________________________ 12
15.1 Dimensions_________________________________________________ 12
15.2 Features ____________________________________________________ 13
15.3 Data table ___________________________________________________14
15.4 Spare parts_________________________________________________ 15
15.5 Spare parts list ____________________________________________ 15
SPECIAL INFORMATION
- Observe all applicable national and regional reg-
ulations and instructions during installation.
- The appliance is not approved for outdoor
installation.
- If the appliance is permanently connected to the
power supply, ensure that the appliance can be
separated from the power supply by an isolator
that disconnects all poles with at least 1/8˝/4 mm
contact gap. Contactors, disconnect switches or
circuit breakers can be used for this.
- Observe the safety regulation to prevent contact
with dangerous ‘live’ currents.
- The appliance is pressurized. During the heat-up
process, expansion water will drip from the safety
valve.
- Regularly activate the safety valve to prevent
it from becoming blocked, e.g. by limescale
deposits.
- Install a type-tested safety valve in the cold water
supply line.
- The maximum pressure in the cold water supply
line must be at least 20% below the response
pressure the safety valve. If the maximum pres-
sure in the cold water supply line is higher, install
a pressure reducing valve.
- Size the drain so that water can drain off unim-
peded when the safety valve is fully opened.
- Fit the discharge pipe of the safety valve with a
constant downward slope and in a room without
risk of frost.
- The safety valve discharge aperture must remain
open to atmosphere.
- Never set the heat exchanger loop pressure
greater than the potable (domestic) water supply
pressure. If potable water pressure is too low, a
booster pump may be needed to assure that it ex-
ceeds the required heat exchanger loop pressure.
15.6 Wiring diagram _________________________________________________ 16
16. Environment and Recycling _______________________________ 16
17. Warranty ____________________________________________________ 17

OPERATION
General information
www.stiebel-eltron-usa.com SB 300-400 E | 3
ENGLISH
OPERATION
1. General information
The chapters “Special information” and "Operation" are intended
for appliance users and qualified contractors.
The chapter "Installation" is intended for qualified contractors.
Note
Read these instructions carefully before using the appli-
ance and retain them for future reference.
Pass on the instructions to a new user if required.
2. Safety
2.1 Intended use
The appliance is intended for DHW heating within the application
limits. See 15.3, “Data table”, pg. 14.
The appliance is intended for domestic use, i.e. it can be used
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 other use beyond that described shall be deemed inappropri-
ate. Observation of these instructions and of instructions for any
accessories used is also part of the correct use of this appliance.
2.2 Incorrect use
The following are not permitted:
- Heating liquids other than potable water
- Operating the appliance with an empty DHW tank
- Operating the appliance outside the application limits (See
15.3, “Data table”, pg. 14)
- Interrupting the power supply
2.3 General safety instructions
Only qualified contractors should carry out the electrical work and
installation of this appliance. Qualified contractors are responsible
for adherence to all applicable regulations.
Operate the appliance only when fully installed and with all safety
equipment fitted.
WARNING
Contact with live components presents a threat to life.
Damage to the electric insulation or to individual com-
ponents may result in a threat to life.
f If there is damage to the insulation, disconnect the
power supply and arrange a repair.
All work on the electrical installation must be carried
out by a qualified contractor.
WARNING Scalding
The water in the DHW tank can be heated to tempera-
tures in excess of 149 °F (65 °C). There is a risk of scalding
at outlet temperatures in excess of 110°F (43 °C).
f Ensure you do not come into contact with the water
when discharged.
WARNING Burns
Touching hot components can lead to burns.
When working on hot components, always wear protec-
tive working clothing and safety gloves.
The pipework connected to the DHW outlet of the appli-
ance can reach temperatures in excess of 149°F (65 °C).
!
CAUTION
Install temperature and pressure protective equipment
required by local codes and no less than a combina-
tion temperature and pressure relief valve certified by a
nationally recognized testing laboratory that maintains
periodic inspection of production of listed equipment or
materials, as meeting the requirements for Relief Valves
and Automatic Gas Shutoff Devices for Hot Water Supply
Systems, ANSI Z21.22. This value must be marked with a
maximum set pressure not to exceed the marked max-
imum working pressure of the water heater. Install the
valve into an opening provided and marked for this pur-
pose in the water heater, and orient it or provide tubing
so that any discharge from the valve exits only within 6
inches above, or at any distance below, the structural
floor, and does not contact any live electrical part.
!
Caution
Only operate the appliance when the DHW tank has been
filled.
!
Caution
Keep the appliance installation room free from air con-
taminated with oil or salt and corrosive or explosive sub-
stances.
2.4 Heat exchanger loop
The SB E tanks have an indirectly fired heat exchanger loop. This
may be used in a variety of scenarios which include boiler loops,
geothermal systems, radiant floor loops, etc. Since the interior
of the heat exchanger is uncoated carbon steel, they must be
configured in a closed loop.
Use only a mixture of inhibited propylene glycol and de-ionized
water. The percentage of the glycol in the mixture depends upon
the climate. Some areas require that the propylene glycol be
GRAS, which is a food grade liquid (Heat exchanger type SW,
AWWA Fluid Class II - see MSDS for handling instructions).
2.5 Test symbols
See 7.1.1, “Sample type plate”, pg. 5.

OPERATION
Register your product
4|SB 300-400 E www.stiebel-eltron-usa.com
3. Register your product
NOTE:
You must register this product within 90 days of pur-
chase on our web site in order to activate any standard
warranty or to be eligible for the extended warranty.
Go to our website at: www.stiebel-eltron-usa.com and
click on “Register Your Product.”
Before beginning the registration process, we suggest that you
gather the necessary information as follows:
Model, Example: SB 300 E (from the label that is on the side of
the unit)
Number listed after “Nr.”
Place of Purchase
Purchase Date
First & Last Name
Email address
Physical Address
Phone Number
If you have any questions concerning the registration process or
warranty options, please contact Stiebel Eltron USA directly at
800.582.8423.
4. Appliance description
The appliance is designed for indoor installation. The appliance
is equipped to heat water through a number of different heating
methods.
There are three ways that this unit can heat water:
- 3 kW electric resistance heating element
- Indirect heat via internal coil heat exchanger
- Indirect heat via auxiliary inlet/outlet ports
The entire heater and hot water system must be filled with water
and have adequate air ventilation. If used, please refer to the solar
collectors and the boilers installation instructions.
4.1 Heating the DHW tank
The first method of heating is by the 3 kW electric resistance heat-
ing element. This is the appliances most basic mode of operation.
An integral temperature sensor detects the thermal energy content
of the amount of heat in the DHW tank. The water in the DHW
tank is heated if the amount of heat is lower than that required to
achieve the set temperature.
The second method of heating is by the internal coil heat ex-
changer. This heat exchanger is designed to have a heat transfer
fluid circulate through it from an indirect heater. This indirect
heater can be a closed loop solar thermal system, boiler or other
traditional appliance that generates heat and transfers it through
a corrosion inhibited heat transfer fluid.
The third method of heating is by auxiliary ports located on the
side of the unit. These auxiliary ports offer direct access to the
domestic water in the tank. A flat plate heat exchanger should be
used to exchange heat between an indirect heater and the water
in the tank.
If either of the last two heating methods require a temperature
sensor, 2 ports are provided on the opposite side of the tank from
the auxiliary and heat exchanger connections.
5. Using the electric heating element
A 3 kW electric heating element comes standard with this product.
The element has a built-in temperature probe that detects the tank
water temperature.
The appliance’s 3 kW electric resistance heating element is factory
preset at 125°F (52°C). The setpoint of the heating element can
be changed easily. A knob is located under the heating element
and can change the level of comfort to meet the needs of the user.
The heating element can be either unplugged during a period of
disuse or removed entirely.
For convenience, the heating element can be removed from the
tank without draining it.
Thermostat knob
Setpoint notch
6. Maintenance and care
Routine care and maintenance extends the life expectancy and
operating safety of the hot water storage unit. The outer casing
should be cleaned with a slightly damp cloth and commercially
available neutral cleaning agent. This should be done on a regular
basis.
WARNING
Never spray the appliance with water.
Never spray water into the appliance.
!
WARNING Injury
Maintenance work, such as checking the electrical safe-
ty, must only be carried out by a qualified contractor.

OPERATION
Plumbing troubleshooting
www.stiebel-eltron-usa.com SB 300-400 E | 5
ENGLISH
Appliance compo-
nents
Care and maintenance tips
Casing Use a damp cloth to clean the casing sections. Never
use abrasive or corrosive cleaning agents.
DHW tank The DHW tank is equipped with a sacrificial anode
and wear indicator to safeguard it against corrosion.
The wear indicator should be checked regularly. Oth-
erwise there is a risk of corrosion.
Electric resistance
heater
Check the condition of the electric resistance heater.
This will extend the expected life of the element.
6.1 Temperature / pressure relief valve
!
WARNING: The T&P relief valve is designed to relieve
built up pressure in the water heater. Fluid may be
discharged at high temperature and/or pressure. Scalding hot
water injuries can occur.
The proper function of the Temperature / Pressure (T&P) relief
valve is required to prevent damage to the hot water storage unit.
The T&P valve needs to be open during cold-water filling of the
unit. When water flows from the relief line at full stream, the tank
is filled, and the T&P valve can be returned to its normal position.
6.2 Decalcification
With hard tap water, a deposit of scale will form on the inside of
the storage unit. Based on professional experience, it is necessary
to decalcify with commercially available solvents at timely inter-
vals. Follow the manufacturers instructions for solvent use. The
hot water storage unit needs to be emptied to do this process. The
clean-out port cover must be removed and sediments on the tank
bottom must be flushed.
6.3 Replacement of the sacrificial anode
Depending on the composition of the tap water, an inspection of
the sacrificial anode at timely intervals is recommended. With
heavy wear, an original equipment replacement anode must be
installed to protect the inner container from corrosion. An inspec-
tion should be performed at least once per year.
7. Plumbing troubleshooting
7.1
Problem Cause Remedy
Inadequate
water pressure
Shut-off valve is not com-
pletely open.
OR
Cold or hot water line is ob-
structed.
Open shut-off valve. Clean or
replace pipes.
Hot water flow
inadequate
Indirect boiler setpoint tem-
perature is too low.
Recommended 176–185°F
(80–85°C).
OR
Heat exchanger is calcified.
Set boiler to recommended
temperature
OR
Clean heat exchanger.
Hot water
storage tank not
being heated
Program selection at the
heater control is not properly
selected.
Select and set program per
instructions.
Faucet flow rate
inadequate
Aerator at the extraction
point is blocked.
Unscrew aerator and clean.
Hot water sup-
ply exhausted
too quickly
Flow rate is too high. Rec-
ommended 2.6–3.9 gpm
(9.8–14.7 l/min).
Restrict spigot valve rate.
Notifying a qualified contractor
If you cannot remedy a failure, notify your qualified contractor. To
facilitate and speed up your request, provide the serial number
from the type plate (000000-0000-00000). The type plate can be
found on the left, above the "DHW outlet" connection.
7.1.1 Sample type plate
Technical data
Datos técnicos
Données techniques
Made in EU
Hecho en EU
Fabriqué en EU
Volume:
Volumen:
Volume:
293 l / 77.4 gal
1 MPa / 145 PSI
Max. pressure:
Presión máxima:
Pression max:
Heat exchanger
Intercambiador de calor
Échangeur de chaleur
Max. pressure:
Presión máxima:
Pression max.:
Heating surface:
Superficie de calefacción:
Surface de chauffe:
1.5 m2/ 16.1 ft2
9.5 l / 2.37 gal
SB 300 E
M-NO.: 234110
S-NO.:
315277-38053
Supply:
Alimentación:
Alimentation:
220-240 V AC, 60 Hz
SINGLE PHASE L-L ONLY
3 kW / 10,239 BTU/h
Power:
Potencia:
Puissance:
2.8 kWh/24h
Standby loss:
Pérdida de calor:
Pertes en mode de veille:
1 MPa / 145 PSI
Volume:
Volumen:
Volume:
Max. temp.:
Temperatura máxima:
Temp. max.:
1.5 MPa / 217 PSI
Testing pressure:
Presión de prueba:
Pression d'essai:
95 °C / 203 °F
Conforms to UL STD. 174
Certified to CAN/CSA STD. C22.2 No.110-94
4010487

6|SB 300-400 E www.stiebel-eltron-usa.com
INSTALLATION
Safety
Technical data
Datos técnicos
Données techniques
Made in EU
Hecho en EU
Fabriqué en EU
Volume:
Volumen:
Volume:
413 l / 109.1 gal
1 MPa / 145 PSI
Max. pressure:
Presión máxima:
Pression max:
Heat exchanger
Intercambiador de calor
Échangeur de chaleur
Max. pressure:
Presión máxima:
Pression max.:
Heating surface:
Superficie de calefacción:
Surface de chauffe:
1.92 m2/ 20.6 ft2
11.1 l / 2.9 gal
SB 400 E
M-NO.: 234111
S-NO.:
315298-38054
Supply:
Alimentación:
Alimentation:
220-240 V AC, 60 Hz
SINGLE PHASE L-L ONLY
3 kW / 10,239 BTU/h
Power:
Potencia:
Puissance:
95 °C / 203 °F
Max. temp.:
Temperatura máxima:
Temp. max.:
3.0 kWh/24h
Standby loss:
Pérdida de calor:
Pertes en mode de veille:
1 MPa / 145 PSI
Volume:
Volumen:
Volume:
1.5 MPa / 217 PSI
Testing pressure:
Presión de prueba:
Pression d'essai:
Conforms to UL STD. 174
Certified to CAN/CSA STD. C22.2 No.110-94
4010487
7.2 Safety label
CAUTION
To reduce the risk of electric shock or fire use only on a utility supply
having a maximum 250 volt, three wire system.
CAUTION
Risk of Electric Shock. Connect branch circuit equipment grounding
means to water heater. For detailed information, refer to instructions.
CAUTION
Risk of Electric Shock and Fire Hazard. Do not connect to supply
by extension cord.
FOR INSTALLED RATING SEE ELEMENT MARKING
Install temperature and pressure protective equipment required by
local codes, but not less than a combination temperature and
pressure relief valve certified as meeting the requirements for Relief
Valves and Automatic Gas Shutoff Devices for Hot Water Supply
Systems, ANSI Z21.22, by a nationally recognized testing laboratory
that maintains periodic inspection of production of listed equipment
or materials. The valve must be oriented, provided with tubing, or
otherwise installed so that discharge can exit only within 6 inches
(15 cm) above, or at any distance below, the structural floor, and
cannot contact any live electrical part.
CAUTION
If the water heater is retrofitted with supplemental heating
equipment, you must adjust both the thermostat controlling the
supplemental heat source (located in the water piping) and the
thermostat on the water heater (behind the access panel) to the
same temperature. Failure to adjust both thermostats to the same
temperature can cause loss of proper temperature control.
When a supplemental heat source is connected to the
appliance, a provision must be made to limit the heat
source temperature not to exceed that of the water heater
thermostat setting.
Safety label on the appliance
INSTALLATION
8. Safety
Only a qualified contractor should carry out the installation, com-
missioning, maintenance and repair of the appliance.
8.1 General safety instructions
To prevent the necessity of a warranty claim, use only origi-
nal accessories and spare parts. If you need spare parts, call
800.582.8423.
8.2 Instructions, standards and regulations
Note
Observe all applicable national and regional regulations
and instructions.
Take note of the appliance type plate and See 15, “Specifications”,
pg. 12.
9. Preparations
9.1 Transport
!
CAUTION Injury
f Take note of the weight of the appliance.
f Use suitable transport aids (e.g. a hand truck) and
enough personnel for transportation.
!
Caution
The appliance is top heavy.
f Make sure the unit is not tilted.
f Only set the appliance down on an even base.
Do not unpack the appliance until it has arrived in the final in-
stallation room.
Leave the appliance in its packaging and on the pallet. This enables
horizontal transport and provides places to rest during transport.
Vehicular transport
!
Caution
The appliance must generally be stored and transported
vertically.
f Observe the information on the packaging.

www.stiebel-eltron-usa.com SB 300-400 E | 7
ENGLISH
INSTALLATION
Preparations
D0000034797
1
1 Recessed grips
Transport from vehicle to installation room
The cardboard box has reinforced recessed grips along the top of
the appliance. You can use these recessed grips, as well as the
pallet at the lower end, to carry the appliance into the installation
room. Take note of the weight of the appliance and ensure a suffi-
cient number of personnel is available for handling the appliance.
9.2 Storage
If it is necessary to store the appliance for a prolonged period
before installation, observe the following information:
- Only store the appliance in a vertical position. Never store
the appliance horizontally.
- Store the appliance in a location that is dry and largely
dust-free.
- Protect the appliance from coming into contact with corrosive
substances.
9.3 Delivery configuration
The hot water storage tank arrives with the following equipment:
-Storageunit
- Welded steel plain-ended pipe heat exchanger
- Hot water corrosion protection with special enamel coating
- Three immersion sleeves for housing of temperature probes
- Magnesium sacrificial anode
-Circulationport
- Two auxiliary heating ports
- Attached flange inspection cover
- PU foam insulation 2 in. thick
- Steel outer cover
9.4 Installation site
The appliance is not approved for outdoor installation except for
garages.
Further requirements regarding the installation room and appli-
ance positioning, to prevent appliance damage:
- The installation location must be free from flammable, highly
combustible gases and substances, as well as high levels of
dust.
- The installation room must be free from the risk of frost.
- The floor of the installation room must be level and have suf-
ficient load bearing capacity. Take note of the weight of the
appliance with a full DHW tank (See 15.3, “Data table”, pg.
14). A floor with insufficient weight capacity is in danger of
collapse. If the appliance is not evenly balanced, there may
be a risk of appliance damage.
- Always leave sufficient distance to provide access for instal-
lation, maintenance and cleaning. Observe the required min-
imum clearances (See 9.5, “Siting the appliance”, pg. 7).
- Ensure that the operation of other equipment in the installa-
tion room is not impaired.
- To reduce the required plumbed tube length, install the unit
very close to the point.
The following installation locations are not permissible, due to
risk of appliance damage:
- Locations where the air is contaminated with oil or salt
- Saline environments
- Areas in proximity to high frequency machines
- Places where the air contains ammonia (e.g.sewage works)
- Places where the air contains chlorine (e.g.swimming pools)
- Generally places where the air is strongly contaminated, e.g.
due to dust, or contains aggressive substances
9.5 Siting the appliance
f Carefully undo the cardboard packaging at the clips.
D0000034797
1
1 Cardboard packaging clips
The appliance is secured to the pallet with metal brackets and
screws. The metal brackets are hooked on to the feet underneath
the floor plate of the appliance.

8|SB 300-400 E www.stiebel-eltron-usa.com
INSTALLATION
Installation
1 Metal bracket fixing screw
f Remove the fixing screw of the metal bracket from the pallet.
f Tilt the appliance to the side for each foot. Screw out the
adjustable tank foot, remove the brackets, and screw in the
adjustable tank foot.
!
Caution
Take note of the appliance's weight and top-heaviness.
f Slightly tip the appliance and carefully roll the appliance off
the pallet.
f Bring the appliance in its final location.
Minimum clearances
f Maintain the minimum clearances.
!
Caution
The appliance must be straightened vertically to avoid
appliance damage.
The feet under the floor plate of the appliance are
height-adjustable.
f Level the appliance horizontally using the height-ad-
justable feet.
10. Installation
!
WARNING Injury
Incorrect installation can lead to serious personal injury.
Before any work, ensure sufficient clearances for the
installation.
Handle sharp-edged components carefully.
10.1 Water connection
!
Caution
Carry out all water connection and installation work in
accordance with local plumbing regulations.
The following material combinations are approved for metal pipe-
work installations:
Cold water inlet DHW outlet
Copper pipe Copper pipe
Steel pipe Steel pipe or copper pipe
f Thoroughly flush the pipework before connecting the ap-
pliance. Foreign bodies, such as welding pearls, rust, sand
or sealant can impair the operational reliability of the
appliance.
!
Caution
To protect the stubs against corrosion the water tube con-
nection must be made with flat gaskets. The use of hemp
on stub threads is not permissible.
Safety valve
The appliance is a sealed unvented DHW tank. Provide the
appliance with a pressure relief valve.
f Install a type-tested safety valve in the T&P port on the side
of the unit. The response pressure of the safety valve must be
below or equal to the permissible operating pressure of the
DHW tank.
The safety valve protects the appliance against unacceptable ex-
cess pressure.
f Ensure that the expansion water escaping from the safety
valve can drip into a drain, e.g. a tank or sink.
Ensure the drain cannot be shut off.
f Size the drain in a way that water can drain off unimpeded
when the safety valve is fully opened.
f Ensure that the discharge pipe of the safety valve is open to
atmosphere.
f Fit the discharge pipe of the safety valve with a constant
downward slope and in a room free from the risk of frost.
Pressure reducing valve
The maximum pressure in the cold water supply line must be at
least 20% below the response pressure the safety valve. If the
maximum pressure in the cold water supply line is higher, install
a pressure reducing valve.
Drain valve
f Install a suitable drain valve at the lowest point in the cold
water inlet line.

www.stiebel-eltron-usa.com SB 300-400 E | 9
ENGLISH
INSTALLATION
Installation
DHW circulation
The heat losses incurred in the DHW circulation line and the elec-
trical power consumption of the circulation pump reduce the effi-
ciency of the system. The cooled water in the circulation line mixes
with the tank content. Where possible, avoid installing a DHW
circulation line. Where that is not possible, the DHW circulation
pump must be controlled thermally or by time switch.
Thermal insulation
f Insulate the DHW line against heat loss in accordance with
locally applicable regulations.
10.2 Heating connection
The heating system can be configured in a variety of ways. The
methods described here are for the most common installation
method. For more questions on installation and configuration of
the heating system, contact Stiebel Eltron.
10.2.1 Connecting to the internal coil heat exchanger
The internal coil heat exchanger connections are 1˝ NPT female.
A common use of this coil is for closed-loop solar thermal appli-
cations, like in the below image.
V
T
VT
Ball valve Check valve T&P valve Expansion tank
Temp. gauge Pres. gauge Flow meter Circulation pump
To solar
From solar
Air separator
A few necessary features of this system include:
- Corrosion inhibiting propylene glycol
- Air separator/eliminator
- Circulation pump
10.2.2 Connecting to the auxiliary ports
The auxiliary ports can be used to add another heating source,
or to supply heat stored in the tank to another location. If the
auxiliary ports are unused for heating, they can be used for a
DHW recirculation loop.
From aux.
heat source
To aux.
heat source
Check valve
Circulation pump
Air/dirt separator
Flat-plate HX
It is necessary for both sides of the heat exchanger to have circu-
lation pumps and air/dirt separators. A check valve is also recom-
mended to prevent thermosiphoning.
Consult your local plumbing code for requirements regarding heat
exchanger properties (double wall, brazed, stainless steel, etc.)
10.3 Power supply
WARNING
Carry out all electrical connection and installation work
in accordance with national and regional regulations.
If the appliance is permanently connected to the power supply,
ensure that the appliance can be separated from the power sup-
ply by an isolator that disconnects double terminal with at least
3mm contact gap. Contactors, mains isolators or fuses can be
used for this.
Disconnect the appliance from the power supply before carrying
out work on the control panel. Prevent the power supply from
being switched on while you are working on the system.
Ensure the appliance is earthed according to locally applicable
requirements.

10 |SB 300-400 E www.stiebel-eltron-usa.com
INSTALLATION
Commissioning
10.3.1 Installing the power cable
!
Caution
Never connect the appliance to the power supply before
the DHW tank is filled.
The power to this appliance is delivered with a power cable with
a mains plug.
f Use minimum 14/2 (with ground) AWG copper wire for in-
stallation. For long wire lengths, you may need to increase
the gauge size. Always install in accordance with all national
and local electrical codes.
f Unit shall be connected to a 15 A dual pole breaker.
f Using the 14/2 wire (or larger if the code calls for it), connect
the 14/2 wire to the 3 wires in the junction box as shown.
f Use the proper strain relief grommet where the wire enters
the junction box.
See 15.6, “Wiring diagram”, pg. 16.
11. Commissioning
11.1 Commissioning
!
Caution
Never connect the appliance to the power supply before
the DHW tank is filled.
11.1.1 Filling the DHW tank
Fill the DHW tank and vent the pipework by following the proce-
dure below:
f Close the drain valve.
f Open all DHW tap points and the shut-off valve in the cold
water supply.
f Close the DHW tap points as soon as water starts to emerge
from them.
11.1.2 Appliance handover
f Explain the appliance function to users and familiarize them
with its operation.
f Make users aware of potential dangers, especially the risk of
scalding.
f Make users aware of critical environmental factors and re-
quirements concerning the installation location.
f Inform users that water may drip from the safety valve
during the heating operation.
f Hand over these operating and installation instructions to
users for safe-keeping.
11.2 Recommissioning
If the appliance is switched off due to an interruption to the power
supply, no specific measures for restarting are required once the
power supply has been restored.
12. Shutting down
!
Caution
If the appliance is disconnected from the power supply,
it is no longer protected against frost.
f Only disconnect the appliance from the power sup-
ply for longer periods if you are also draining the
DHW tank.
If there is no usage of hot water for a long period of time, always
drain the DHW tank. See 14.2, “Draining the tank”, pg. 11.
The appliance can only be switched off by interrupting the power
supply.
f Pull the mains plug from the socket or disconnect the appli-
ance from the mains in the fuse box.
13. Electrical Troubleshooting
WARNING Risk of Electric Shock
Prior to all work on the appliance, isolate it from the
power supply.
!
Caution
If you disconnect the appliance from the power supply, it
is no longer protected against frost.
f Only disconnect the appliance from the power sup-
ply for longer periods if you are also draining the
DHW tank.
f For work on the electric heating element, remove the heating
element cover (See 14.1, “Removing the heating element
cover”, pg. 11).
If the unit does not provide hot water, then the heating element
is likely not heating the water.
1 Check that the circuit breaker is in the on position. Reset if
necessary.
2 Inspect the connections inside the junction box. Repair if
necessary.
3 Check the voltage at the junction box connections. The volt-
age should be 240 VAC.
4 Check for proper resistance of the heating element.
f Turn off circuit breaker.
f Disconnect wire nuts on L1 and L2 and separate wires.
f Measure the resistance between the two black wires going
into the conduit of the tank. It should measure 17.6 Ω ±10%.
f If the measurement is off, there may be an internal wiring
problem or a faulty heating element. Call Stiebel Eltron for
technical support.
Note
Refit the heating element cover after completing your
work. See 14, “Maintenance and cleaning”, pg. 11).