STIEBEL ELTRON Accelera 220 E Quick start guide

OPERATION AND INSTALLATION
FUNCIONAMIENTO E INSTALACIÓN
MODE D’EMPLOI ET INSTALLATION
DHW heat pump water heater
Calentador de agua con bomba eléctrica de calor
Chauffe-eau à thermopompe
» Accelera 220 E
» Accelera 300 E
Conforms to ANSI/UL Std. 499, 1995, 94-5 VA, 174
Certified to CAN/CSA Std. C22.2 No. 110
Conforme a ANSI/UL Std. 499, 1995, 94-5 VA, 174
Certificación con CAN/CSA Std. C22.2 No. 110
Conforme à la norme ANSI/UL Std. 499, 1995, 94-5 VA, 174
Certifié à la norme CAN/CSA Std. C22.2 No. 110
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.

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CONTENTS
ACCELERA® 220/300 E QUICK START-UP GUIDE
OPERATION
1. General information _________________________________________7
2. Safety__________________________________________________________7
2.1 Intended use______________________________________________________ 7
2.2 Incorrect use______________________________________________________ 7
2.3 General safety instructions ____________________________________ 7
2.4 ETL designation __________________________________________________ 8
2.5 Appliance labels _________________________________________________ 8
3. Register your product _____________________________________ 10
4. Appliance description _____________________________________ 10
4.1 Heating the DHW tank _________________________________________11
4.2 Appliance operation outside the application limits______ 11
4.3 Freeze protection _______________________________________________ 12
5. Settings _____________________________________________________ 12
5.1 Display and controls____________________________________________ 12
5.2 Settings ___________________________________________________________ 12
5.3 Changing mode of operation _________________________________ 14
5.4 Calling up fault codes__________________________________________ 14
5.5 Rapid heating key ______________________________________________ 14
5.6 Emergency shutdown__________________________________________ 15
6. Maintenance and care _____________________________________ 15
7. Troubleshooting ____________________________________________ 16
7.1 Fault codes _______________________________________________________ 17
INSTALLATION
8. Safety________________________________________________________ 18
8.1 General safety instructions ___________________________________ 18
8.2 Instructions, standards and regulations ___________________18
8.3 Incorrect use_____________________________________________________ 18
8.4 Qualification _____________________________________________________ 18
9. Appliance description _____________________________________ 19
9.1 Standard delivery_______________________________________________ 19
9.2 Required accessories __________________________________________ 19
9.3 Further accessories_____________________________________________ 19
10. Preparations________________________________________________ 19
10.1 Transport _________________________________________________________ 19
10.2 Storage____________________________________________________________ 19
10.3 Installation site__________________________________________________ 19
10.4 Siting the appliance ____________________________________________ 20
10.5 Minimum clearances___________________________________________ 21
11. Installation__________________________________________________ 21
11.1 Water connection _______________________________________________ 21
11.2 Condensate drain _______________________________________________ 22
11.3 Choosing the operation mode________________________________ 22
11.4 Power supply ____________________________________________________ 23
11.5 Assembling the appliance ____________________________________ 25
12. Commissioning _____________________________________________ 26
12.1 Commissioning__________________________________________________ 26
12.2 Recommissioning_______________________________________________ 26
13. Shutting down______________________________________________ 26
14. Troubleshooting ____________________________________________ 26
14.1 Fault table________________________________________________________ 26
14.2 Resetting the safety pressure limiter _______________________ 27
14.3 Resetting the high limit safety cut-out _____________________ 27
14.4 Motor overload relay___________________________________________ 27
15. Maintenance and cleaning ________________________________ 27
15.1 Removing the appliance cover _______________________________ 27
15.2 Removing the casing ring_____________________________________ 28
15.3 Cleaning the evaporator_______________________________________ 28
15.4 Draining the tank _______________________________________________ 28
15.5 Descaling the electric booster element ____________________ 29
15.6 Protective anode ________________________________________________ 29
15.7 Valves _____________________________________________________________29
15.8 Replacing the power cable ___________________________________ 29
15.9 Fitting the casing ring _________________________________________ 29
15.10 Fitting the appliance cover ___________________________________ 29
16. Specification ________________________________________________ 30
16.1 Dimensions and connections_________________________________ 30
16.2 Wiring diagram _________________________________________________ 32
16.3 Data table ________________________________________________________ 33
17. Warranty ____________________________________________________ 35

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SPECIAL INFORMATION
This manual includes important information regarding the safe
and efficient handling of the water heater. Keep this manual with
the water heater at all times.
Work must only be carried out by a licensed installer who has read
and understands these instructions. All federal, state and local
codes must be followed. Failure to do so may result in equipment
failure, serious injury, or death.
While working on the water heater, disconnect the power supply.
Illustrations in these instructions are designed to aid a general
understanding and may deviate from the actual water heater ver-
sion. No claims can be derived from such installations.
Limited liability:
We have collated all details and information in this manual in due
consideration of applicable standards and regulations, the state of
the art and our long-term know-how and experience.
Losses due to the following are excluded from our liability:
- Non-observance of these instructions
-Incorrectuse
- Installation of water heater by unqualified personnel
- Unauthorized modifications
- Use of unauthorized spare parts
For more information on liability, see the warranty section at the
back of this manual.
Copyright:
These operating and installation instructions are subject to copy-
right.
Transferring these instructions to third parties, copying of any
kind, either in total or extracts therefrom, as well as their use
and/or conveying its contents are prohibited without our written
consent.
Violations are liable to claims for compensation. Further claims
are reserved.
We hold the copyright:
Stiebel Eltron, Inc.
17 West Street | West Hatfield, MA 01088
Tel. [phone] | Fax [phone]
Email [e-mail]
www.stiebel-eltron-usa.com
Should you have any questions regarding the installation or op-
eration of the water heater, please contact our customer service.
Tel. (USA) 800-582-8423 or 413-247-3380
Please record your serial number and information:
Serial No.:
Date of purchase:

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QUICK START-UP GUIDE
General information
ACCELERA® 220/300 E QUICK START-UP
GUIDE
Overview:
Installation of this water heater is similar to standard electric water heaters, with a few minor exceptions. Be sure to follow all state
and local codes during installation. This Quick Start-up Guide is not intended to be a substitute for the complete installation manual.
Be sure to follow all safety precautions.
Unpacking:
DO NOT unpack the water heater until it is located at the point of installation. Follow all instructions in the manual and be sure to use
caution, as this unit is top heavy. After unpacking, DO NOT lay the unit down and DO NOT jar or tip the unit past 45 degrees on a hand
truck. If the appliance has not been completely vertical during transport or setup, it must rest in a vertical position for at least one hour
before commissioning.
Installation of water connections:
1. Find a suitable location that fits the room spacing guidelines on the next page. The minimum volume of the room is 10´ x 10´ x 8´.
Be sure vents are parallel to the wall with the fan facing the most open area along that wall. Please note: a drain pan is recom-
mended, and may be code in some areas.
2. The inlet & outlet plumbing connections on the unit are 1˝ male NPT. It is recommended to use union connections for easier ser-
viceability. Install a boiler drain at the cold water inlet for easier draining of the tank. Do not use hemp for sealing.
3. The temperature & pressure (T&P) safety valve port is ¾˝ female NPT. A T&P valve is supplied which is rated to release water at
100 psi and/or 210°F (99°C). Plumb this connection to a bucket or directly to a drain. If it is plumbed to a bucket, check it often for
any accumulated water.
For hook-up, follow all state and local codes for check valves, expansion tanks, shut off valves, gauges, etc.
Note
A 70 psi (4.8 bar) pressure reducing valve must be in-
stalled to ensure the pressure of the incoming water line
never exceeds 70 psi (4.8 bar). (See 11.1, “Water connec-
tion”, pg. 21).
Condensate drain:
Run the condensate drain connection directly into a drain or use a condensate pump to drain into a suitable location (See 11.2, “Con-
densate drain”, pg. 22).
Fill & flush tank:
Run water and be sure the tank is full prior to turning on the electricity.
Installation/electrical:
Use a 240 Volt / 15 Amp double pole breaker and connect to the water heater L1,L2 & ground (See 11.4, “Power supply”, pg. 23).
Recirculation loop:
Stiebel Eltron advises against the installation of this appliance in any recirculation loop. If a recirculation loop is required, see 11.1.6,
“Recirculation loop”, pg. 22 for recirculation installation requirements.

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ENGLISH
14˝
(0.4 m)
2´ (0.6 m)
8˝ (0.2 m)
6´ (1.8 m)
Air flow
intake
Air flow
intake
Air flow
exhaust
Air flow
exhaust
2´ (0.6 m)
Air flow
intake
Air flow
exhaust
6´ (1.8 m)
Minimum room volume:
800 ft2,10´ x 10´ x 8´
(22.7 m2, 3 m x 3 m x 2.4 m)
Acceptable positioning, vent parallel to a wall:
Acceptable positioning, vent parallel to a wall in a corner:
2´
(0.6 m)
2´
(0.6 m)
8˝ (0.2 m)
8˝
(0.2 m)
6´
(1.8 m)
42˝ (220 E)
60˝ (300 E)
› Do not install in a room
with less than 800 cubic
feet of total volume.
› Do not install with the air
exhaust pointing at a wall
or any surface closer than
6 feet away.
› Do not install with the air
intake pointing to a wall or
any surface closer than 2
feet away.
› If you are installing an
Accelera 220 E next to
another appliance, the
appliance cannot be
taller than 42. If you are
installing an Accelera 300
E, the appliance cannot
be taller than 60. This
restriction is to prevent an
appliance from obstructing
air flow to and from the
Accelera.
› Failure to follow
installation instructions
will void the factory
warranty.
QUICK START-UP GUIDE
Required room dimensions and clearances

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QUICK START-UP GUIDE
Plumbing connections
H
M
C
Cold water
Hot water
2
11 14
12
13
10
3
45
6
78
9
1
1 Vacuum breaker
2 Hot water connection (1˝ NPT)
3 Mixing valve (optional, supplied by installer)
4 Connection for T&P valve (¾˝ NPT)
5 T&P valve ¾˝ NPT, 100 psi @210°F (0.69 MPa @99 °C), supplied with unit
6 Expansion tank, min. recommended size*: 5 gal. (19 l), (required, supplied by
installer)
7 Straight-through shut-off valve (supplied by installer)
8 Check valve (required, supplied by installer)
9 0.48 MPa (70 psi) pressure reduction valve (required, supplied by installer)
10 Cold water connection (1˝ NPT)
11 Condensate drain (¾˝ R to ½˝ barbed elbow), supplied with unit
12 Drain valve (supplied by installer)
13 Drain pan (supplied by installer)
14 Condensate spillover
* Recommendation based on 70 psi inlet pressure, expansion tank precharged to 70 psi
(4.8 bar), 149 °F (65°C) max. tank temperature, entire contents of the tank are not
drained on each use, and fill temperature is 70°F (21.1°C).

OPERATION
General information
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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
This chapter provides an overview of all important actions re-
quired for a safe and trouble-free operation.
2.1 Intended use
The appliance is intended for DHW heating within the application
limits (See 16.3, “Data table”, pg. 33).
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
16.3, “Data table”, pg. 33)
- Interrupting the power supply, as without power supply the
appliance is not protected against corrosion
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 Injury
The appliance may be used by children aged 8 and up and
persons with reduced physical, sensory or mental capa-
bilities or a lack of experience and know-how, provided
that they are supervised or they have been instructed on
how to use the appliance safely and have understood
the resulting risks. Children must never play with the
appliance. Children must never clean the appliance or
perform user maintenance unless they are supervised.
WARNING Electrocution
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.
 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.
 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.
WARNING Scalding
The appliance is filled with refrigerant at the factory.
In case of leaking refrigerant, avoid coming into contact
with the refrigerant or inhaling the released vapors. Ven-
tilate the rooms affected.
!
CAUTION Injury
Never place any objects on top of the appliance. If objects
are left on the appliance, noise emissions may increase
due to resulting vibrations, and the objects could fall
and cause injury.
!
CAUTION
To reduce the risk of excessive pressures and tempera-
tures in this water heater, install temperature and pres-
sure protective equipment required by local codes and
no less than a combination temperature and pressure
relief valve certified by a nationally recognized testing
laboratory that maintains periodic inspection of produc-
tion of listed equipment or materials, as meeting the re-
quirements for Relief Valves and Automatic Gas Shutoff
Devices for Hot Water Supply Systems, ANSI Z21.22. This
valve must be marked with a maximum set pressure not
to exceed the marked maximum working pressure of the
water heater. Install the valve into an opening provided
and marked for this purpose 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. The discharge opening must not
be blocked or reduced in size under any circumstances.

OPERATION
Safety
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!
CAUTION
Hydrogen gas is produced by this heater in a hot water
system that has not been used for a long period of time
(2 weeks or more). Hydrogen gas is extremely flamma-
ble. To reduce the risk of injury under these conditions,
it is recommended that the hot water faucet be opened
for several minutes at the kitchen sink before using any
electrical appliance connected to the hot water system.
When hydrogen is present, there will probably be an
unusual sound such as air escaping through the pipe as
the water begins to flow. There should be no smoking or
open flame near the faucet at the time it is open.
!
Material losses
If you disconnect the appliance from the power supply, it
is no longer protected against frost.
 Do not interrupt the power supply to the appliance.
!
Material losses
Never cover this appliance. Covering the air intake or air
discharge leads to a reduced air supply. If the air supply
is restricted, the operational reliability of the appliance
cannot be guaranteed.
!
Material losses
Only operate the appliance when the DHW tank has been
filled.
!
Material losses
Keep the appliance installation room free from air con-
taminated with oil or salt and corrosive or explosive sub-
stances.
2.4 ETL designation
The ETL designation shows that the appliance meets all essential
UL and CAN/CSA requirements. This appliance conforms to:
- UL Standard 1995
- UL Standard 174
- CAN/CSA Standard C22.2 No.236-05
- CAN/CSA Standard C22.2 No.110-94
2.5 Appliance labels
1. Type plate label for the Accelera 220 E
000000-0000-00000
D0000035352
2. Condensate drain information label
315683-38055
Condensate
Condenso
311801-38055
Condensat
3. Hot water outlet location label
Hot Water Outlet
311803-38055
Salida de agua caliente
Sortie eau chaude
4. Cold water outlet location label
Cold Water Inlet
311802-38055
Entrada para agua fría
Entrée eau froide
5. Power connection information label
Power supply
Disconect power supply
Before opening the cover
!Attention!
Must connect to
240 V, 15 A
Double-pole
Circuit breaker

OPERATION
Safety
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6. Scald risk information label
Une température de l'eau de plus de 52°C (125°F) peut
causer des brûlures graves ou la mort par ébouillantage
Les enfants, les personnes handicapées et les personnes
âgées courent le plus grand risque de brûlures.
Lire la notice d'emploi avant d'ajuster la température du
chauffe-eau.
Vérifier la température de l'eau avant
de prendre un bain ou une douche.
Des dispositifs de limitation de température sont
disponibles. Voir la notice d'emploi.
ATTENTION
L'eau chaude peut provoquer des brûlures de 3ème
degré:
En 6 secondes à 60°C (140°F).
En 30 secondes à 54°C (130°F).
Réglé à l'usine à 52°C (125°F).
Contacter le personnel de service après-vente qualifié
pour toute modification.
Agua con temperatura de más de 52 °C (125 °F) puede
al instante causar quemaduras graves o la muerte por
escaldadura.
Niños, personas con discapacidades o mayores se
encuentran en mayor peligro de escaldadura.
Mire las instrucciones de uso antes de ajustar la
temperatura en el calentador de agua.
Pruebe el agua antes de bañarse o de ducharse.
Están disponibles válvulas para regular la
temperatura. Mire las instrucciones de uso.
ADVERTENCIA
Agua muy caliente puede causar quemaduras
de 3 grado. En 6 segundos A 60 °C (140 °F).
En 30 segundos A 54 °C (130 °F).
La regulación fue ajustada en la producción
A 52 °C (125°F). Si necesita ajustar la regulación,
contácte al técnico de serviciocalificado.
er
AQUA CALIENTE
ABRASAR
52 125
7. Gasket connection information label
311804-38916
To protect against corrosion, use a flat
gasket ring or teflon tape and thread sealant.
Never use hemp cord on the threads.
Para proteger contra la corrosión, utilice
el anillo de goma plano o cinta teflon
y sellador de roscas. Nunca utilice
Pour protéger contre la corrosion, utiliser des
joints plats ou du ruban téflon et l´étanchement
des filets. Ne jamais utiliser la corde
de chanvre sur les filets.
la cuerda de cá ñ amo en las roscas.
8. Pressure & temperature relief valve information label
315321-38055
Relief valve
Plumber:
The relief valve installation m ust be fitted to this socket.
The pressure and temperature relief valve has to meet
local codes and comply with ANSI Z21.22.
Soupape de sûreté
Plombier:
L'installation de la soupape de sûreté doit être branchée sur cette prise.
La soupape de sûreté pour la pression et la température doit être conforme
à la réglementation locale et à ANSI Z21.22.
Válvula de seguridad
Plomero:
La válvula de seguridad debe instalarse en esta conexión.
Las válvulas limitadoras de presión y temperatura tienen que
ajustarse al código local y cumplir con la norma ANSI Z21.22.
9. Kyoto protocol information label
ES: Sistema herméticamente cerrado que contiene gases de efecto invernadero mencionados en el protocolo de Kioto.
BG: Съдържа посочените в Протокола от Киото флуорирани парникови газове - херметически затворена система.
299581-36960
10. Supplemental heat element information label
315322-38055
If the water heater is retrofitted with a supplemental heat element
make sure that both thermostat are adjusted on the same
water temperature set point.
Si le chauffe-eau est rénové avec un élément de chauffe supplémentaire,
assurez-vous que les deux thermostats soient ajustés
à la même température de réglage de l'eau.
Si el calentador de agua está adaptado a un elemento calentador
suplementario, asegúrese que ambos termostatos estén ajustados
a la misma temperatura de agua.

OPERATION
Register your product
10 | Accelera® 220-300 E www.stiebel-eltron-usa.com
11. Booster heater element information label
CAUTION
for use only in water
ATTENTION
ATENCIÓN
315683-38055
pour l'utilisation dans l'eau
se usa sólo para en agua
12. Appliance must be vertical for at least one hour before com-
missioning information label
WARNING / WARNUNG
The unit must remain in vertical position for at least
one hour before putting unit into operation.
Die Anlage muss min. 1 Stunde lang vor deren
Inbetriebnahme in senkrechter Position bleiben.
L’appareil doit être placé en position verticale
au moins une heure avant sa mise en route.
La unidad tiene que quedar en la posición vertical
al menos durante una hora antes de poner la unidad
en funcionamiento.
315125-38055
3. Register your product
You must register this product within 90 days of pur-
chase on our web site in order to activate the standard
warranty or to be eligible for the extended warranty.
Go to our web site 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 which will be as
follows:
000000-0000-00000
1 Serial number on the type plate
Type, Example: Accelera 220 E (from the label that is on the
unit)
Number listed after “Nr.”
Place of Purchase
Purchase Date
First & Last Name
Email address
Physical Address
Phone Number
Installation Date
If you have any questions concerning the registration process
or warranty options, please contact Stiebel Eltron USA direct-
ly at 800-582-8423.
4. Appliance description
The appliance is designed for indoor installation. The appliance
recirculates ambient air and does not require outdoor air. The
appliance extracts heat from the ambient air. This heat is utilized
to heat the water in the DHW tank with added electric power. The
amount of electric energy and time required to heat-up the DHW
depends on the temperature and humidity of the ambient air.
This heat extraction results in a drop in the ambient temperature
inside the installation room by between 2°F (1°C)and 5.5°F (3°C).
The appliance also extracts moisture from the air, which turns into
condensate. The condensate is drained from the appliance via the
condensate drain.
When a hot water draw-off point is opened, the hot DHW is pushed
out of the appliance by the in-flow of cold DHW.
To protect against corrosion, the inside of the DHW tank is coated
with special enamel and is additionally equipped with an im-
pressed current anode.

OPERATION
Appliance description
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The electronic control unit makes energy saving adjustments eas-
ier. Subject to the power supply and usage pattern, the water is
heated up automatically to the set temperature.
Heat pump operating principle
A hermetic circuit within the appliance contains refrigerant (See
16.3, “Data table”, pg. 33). This refrigerant evaporates at low
temperatures and collects heat from the ambient air.
In the evaporator, the refrigerant changes from its liquid into its
gaseous state. A compressor draws in the gaseous refrigerant
and compresses it. This increase in pressure raises the refrigerant
temperature.
The compression process requires electrical energy. The energy
(motor heat) is not lost, but is discharged to the downstream con-
denser. There, the refrigerant indirectly transfers heat to the DHW
tank and the liquid refrigerant is routed to a a filter dryer. An ex-
pansion valve reduces the still prevalent pressure. The refrigerant
is routed to the two-flood evaporator and the cycle starts again.
Note
In the event of an interruption of the power supply, the
compressor is blocked from operating for at least one
minute. The electronic control board (ECB) delays elec-
tronic starting for one minute while the appliance goes
through its initializing process.
If the compressor subsequently fails to start, it may be
blocked by additional safety devices (Klixon and/or high
pressure switch). If the compressor is switched off due
to the Klixon, the pressure difference between the high
and low pressure sides of the refrigerant circuit may be
the cause. When the pressure difference is equalized
(approximately 5 minutes), the compressor turns on. If a
tripped high pressure switch caused the blocking of the
compressor, this may be due to a failed thermostat or
high ambient air temperature. After the power supply has
been re-established, the appliance continues to operate
with the parameters that were selected before the power
supply was interrupted.
4.1 Heating the DHW tank
2
1
1 Dome sensor
2 Integral sensor
The appliance is equipped with two temperature sensors.
- The dome sensor captures the water temperature in the
upper section of the tank.
- The integral sensor is a temperature sensor affixed over the
entire tank height. The integral sensor determines the aver-
age tank temperature.
The appliance display indicates the temperature in the upper sec-
tion of the tank. The appliance control unit operates using the
average tank temperature.
The appliance may start to heat even though the display indicates
that the thermostat is fulfilled. In this case the deviation of the
average tank temperature from the set value is greater than the
hysteresis of the integral sensor thermostat.
At ambient air temperatures lower than 46 °F (7.8 °C), the unit will
automatically enter defrost mode from time to time to remove ice
buildup on the evaporator.
For information on the heat-up time, See 16.3, “Data table”, pg.
33. The calculation of the available amount of mixed water is
based on the average cylinder temperature. The amount of mixed
water is only calculated if the water temperature in the upper
section of the cylinder is higher than 104°F (40 °C).
DHW is normally heated by the heat pump of the appliance within
the application limits (See 16.3, “Data table”, pg. 33).
4.1.1 Electric booster element
The electric booster element is used for times of unexpectedly
high hot water demand. The element is activated manually via
the red dot push button located on the front display panel (See
5.1, “Display and controls”, pg. 12, item no. 8, “Rapid heating
key”). It is also activated automatically when the appliance is in
Automatic Mode (See 5.3.1, “Automatic Mode”, pg. 14).
In case of a heat pump failure you can start the electric emer-
gency/booster heater should the appliance develop a fault and
the fault code is higher than 256 )See 5.5.2, “Emergency back up
mode”, pg. 15).
In the event of an unexpectedly high hot water demand, the emer-
gency/booster heater can be activated with the rapid heating key
in addition to the heat pump. See 5.5.1, “Comfort heating”, pg.
14.
4.2 Appliance operation outside the application
limits
4.2.1 Ambient temperatures below the application limit
If hoar frost is growing on the evaporator fins, the hoar frost
temperature monitor switches the heat pump compressor off.
The compressor switches on automatically once the evaporator
defrosts. Defrost only works if the ambient air temperature is
more than 38°F (3.3 °C)
 To guarantee fault-free operation of the appliance, make sure
you operate the appliance within its application limits (See
16.3, “Data table”, pg. 33).
Note
Heat-up times are longer while the evaporator is defrost-
ing.

OPERATION
Settings
12 | Accelera® 220-300 E www.stiebel-eltron-usa.com
4.2.2 Ambient temperatures above the application limit
The safety equipment switches the appliance off if the upper ap-
plication limit is exceeded.
Following a cooling time of several minutes, the appliance is
switched back on automatically. The appliance is switched off
again if the ambient temperature rises above the permissible tem-
perature value again.
 To guarantee fault-free operation of the appliance, make sure
you operate the appliance within its application limits (See
16.3, “Data table”, pg. 33).
4.3 Freeze protection
The appliance activates a freeze protection function if the integral
sensor in the DHW tank detects a temperature below 50 °F (10°C).
The appliance then heats the water in parallel mode by using both
the heat pump and the electric booster element. The heat pump
and electric booster element switch off once the temperature de-
tected by the integral sensor is more than 65°F (18°C).
5. Settings
5.1 Display and controls
electronic comfort
1
3
6
7
4
13
8
11
26_03_13_0006_
c
comfor
t
4
om
for
t
4
4
5
2
10
9
14
12
1 Actual temperature
2 Set temperature 1
3 Set temperature 2 active
4 Plus key
5 Minus key
6 Service/error symbol
7 Defrost mode
8 Heat pump
9 Electric booster element
10 Freeze protection
11 Rapid heating key
12 Amount of mixed water display (l @40 °C /gal @ 104 °F)
Actual temperature display, upper tank section/
Set temperature1display
Set temperature2display
Fault code display
13 Menu key
14 Amount of mixed water
The "electric booster element" and “heat pump” symbols are dis-
played when these appliance components are running.
Note
The back-light of the display will illuminate for 15 seconds
after pressing any button.
Service/fault symbol
Note
Notify your installer if the service/fault symbol appears
on the display. Continuous illumination of the symbol
indicates that the fault is not preventing appliance op-
eration.
A flashing service/fault symbol indicates that the water
is not being heated and that it is essential you notify
your contractor.
5.2 Settings
In standard display mode, the display shows the current amount
of mixed water.
Note
15seconds after every adjustment, the appliance auto-
matically switches back to the standard display and saves
the set value.
With the menu key, all information and
setting options are called up in sequence.
The relevant symbol appears with each
setting.
5.2.1 Amount of mixed water display (standard display)
The currently available amount of mixed
water at 104°F (40 °C) when mixed with
59°F (15°C) cold water is shown.
If there is no usable hot water in the tank,
the display shows “--”.
DHW demand for Amount of mixed water at (104°F/40°C)
Bath 32-40 gal (120-150 l)
Shower 9-13 gal (30-50 l)
Hand washing ½-1½ gal (2-5 l)
The amount of mixed water that can be achieved depends on the
set point temperature.

OPERATION
Settings
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ENGLISH
5.2.2 Actual temperature display
In the mixed water menu, press the
menu key once to get to the actual tem-
perature menu.
The current actual temperature in
the upper section of the DHW tank is
shown. This largely corresponds to the
outlet temperature.
5.2.3 Set temperature1
Note
For reasons of legionella prevention, never set the DHW
temperature lower than 124°F (50 °C).
Set temperature 1 is the default DHW temperature the appliance
heats to. Set temperature 1 is set to 131°F (55°C) at the factory.
Set temperature 1 is active if no external signal transmitter is
connected and active (See 5.2.5, “Set temperature2”, pg. 13)
In the actual temperature menu, press
the menu key once to get to the menu
for set temperature1.
The set temperature1 symbol appears.
Adjust set temperature1 from 69–149°F
(20.5–65°C) using the plus and minus
keys.
Note
Another way to adjust set temperature1 is to press the
plus or minus key when in standard display (amount of
mixed water).
5.2.4 Freeze protection
If the water temperature in the tank is below 59°F, the heat pump
and the electric element activate as a freeze protection measure.
This mode deactivates once the water temperature reaches 65°F.
If the set temperature is set to less than
69 °F (20.5 °C), only freeze protection re-
mains active. The water heater will not
run.
5.2.5 Set temperature2
Note
For reasons of legionella prevention, never set the DHW
temperature lower than 124°F (50 °C).
Set temperature2 is the DHW temperature to which the appliance
heats if an external signal transmitter is connected and active.
In the set temperature1 menu, press
the menu key once to get to the menu
for set temperature2.
The set temperature2 symbol appears.
Adjust set temperature2, from 69–
149°F (20.5–65°C) using the plus and
minus keys.
Operation with external signal transmitter (240 V input)
The connection of the heat pump to an external signal offers the
possibility of heating water to a raised temperature set point
during periods when electric rates are favorable, for example
during times when PV power is available or low tariff utility rates
are in effect.
The external signal may be offered by a PV system or off-peak
electricity rates of a utility.
If an external signal is received, set temperature 2 becomes active,
overriding set temperature 1, the standard set DHW temperature.
If set temperature 2 has been activated by the external signal
transmitter, this set temperature will then be active for at least
20 minutes. If the signal remains active after those 20 minutes
passed, the compressor will run until the external signal. If not,
the selected set temperature 1 is activated again.
If the relevant set DHW temperature is accomplished, the com-
pressor switches off and remains off for a minimum idle time of
20minutes.
The following diagram illustrates the connections by means of a
sample signal sequence of an external signal transmitter.
Example:
- DHW temperature = 131°F (55°C)
- Set temperature 1 = 124 °F (50°C)
- Set temperature 2 = 149°F (65°C)
A
240 V
0 V 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 t [min]
B
On 1
Off 2
0 5 1015202530354045505560657075t[min]
D0000034613
A LF signal
B Compressor
1 20 min. minimum runtime, set temperature 2
2 20 min. minimum compressor idle time

OPERATION
Settings
14 | Accelera® 220-300 E www.stiebel-eltron-usa.com
Note
An LF signal must be active for at least 60seconds before
the control unit responds to it. This prevents cycling of the
compressor due to fast changing sun radiation conditions.
5.2.6 Changing units
This appliance is capable of displaying temperature and volume
in either US units or SI units. A selection of 0 at this screen will
show units in Fahrenheit and gallons. A selection of 1 screen will
show units in Celsius and liters.
Press the menu key until the screen dis-
plays “SI” and either 0 or 1.
Adjust the display units from US to SI (0
to 1) using the plus and minus keys.
5.3 Changing mode of operation
This appliance has two operating modes which determine the
relative use of the heat pump to the backup electric element:
Automatic Mode & Heat Pump Only Mode.
5.3.1 Automatic Mode
The appliance ships factory set to Automatic Mode. In Automatic
Mode, water is heated primarily with the heat pump to satisfy Set
temperature 1 (See 5.2.3, “Set temperature1”, pg. 13), or Set
temperature 2 (See 5.2.5, “Set temperature2”, pg. 13) If the hot
water consumption is more than the heat pump can keep up by
itself, Automatic Mode automatically activates the backup element
to provide additional heating and faster hot water recovery.
Automatic Mode balances energy savings with user comfort by
relying primarily on the heat pump and automatically activating
the backup electric element during times of high hot water de-
mand. Automatic Mode is the recommended operation mode for
most installations.
5.3.2 Heat Pump Only Mode
During installation the appliance can be manually set to Heat
Pump Only Mode by a technician. In this mode, the backup ele-
ment is not activated during normal operation, and the heat pump
is the source of heating. If the tank contents become exhausted,
the user must either wait for the heat pump to reheat the tank or
press the rapid heating key for backup comfort heating (See 5.5.1,
“Comfort heating”, pg. 14).
Heat Pump Only Mode prioritizes energy savings over the hot
water recovery rate. Heat Pump Only Mode is recommended for
installations where curtailing energy usage is of the highest con-
cern, such as an installation where power is off-grid. Note that
even when Heat Pump Only Mode is selected that freeze protection
is still active (See 5.2.4, “Freeze protection”, pg. 13).
5.4 Calling up fault codes
While on the “changing units” menu,
press the menu key to get to the fault
code menu. A fault code will appear if
a fault has occurred. If no error has oc-
curred, this menu is not available.
See 7.1, “Fault codes”, pg. 17.
5.5 Rapid heating key
Press the rapid heating key.
The electric booster element symbol ap-
pears. The heat pump symbol may ap-
pear depending on the tank temperature
when the button is pressed.
5.5.1 Comfort heating
The rapid heating key activates the comfort heating function,
which enables the water heater to satisfy a high DHW demand
without changing any of the appliance’s standard settings.
When comfort heating is activated by pressing the rapid heating
key, the heat pump and the booster element will start in parallel,
irrespective of the current tank temperature. The heat pump and
booster will remain active until the tank temperature reaches the
set temperature.
In addition, the booster element will work in parallel with the heat
pump during normal operation for 48 hours. After 48 hours, the
appliance switches back to previously set parameters.
Note
The electric booster element and heat pump symbols are
displayed until the comfort heating function has ended.
During comfort heating, the electric element switches
off once the upper section of the tank is heated to the set
temperature. The heat pump switches off when the entire
tank is heated to the set temperature.

OPERATION
Maintenance and care
www.stiebel-eltron-usa.com Accelera® 220-300 E | 15
ENGLISH
5.5.2 Emergency back up mode
If the heat pump is out of order, it is possible to use the electric
booster element in backup mode to ensure hot water production.
The compressor is disabled automatically if the thermostat mea-
sures a temperature increase less than 0.5°F (0.25°C) in a time
frame of 13 hours despite there being a demand. This action is
taken to recognize a fault in the heat pump circuit and alert the
user of the fault as soon as possible. In this case the fault code “8”
is activated and will flash. The fault key flashes on the display and
a fault code indicates that the appliance is not heating the water.
To activate the backup mode, press the rapid heating key. After
the rapid heating key has been pressed, the indicated fault code
increases by a value of 256, as the fault codes are summed to-
gether (See 7.1, “Fault codes”, pg. 17). The fault key continues
to flash. The electric booster element is activated.
The current set temperature (set temperature 1 or set temperature
2) is ignored. In emergency mode, the appliance operates with a
fixed set temperature of 104°F (40°C). After a one-off activation
of the function via the rapid heating key, this function remains
active for 7 days.
Following 7 days of backup operation, the electric booster ele-
ment is deactivated. The fault code shown on the display again
flashes “8”.
If the rapid heating key is pressed again within the 7 days of
backup operation, the 7-day run time for emergency mode will
start fresh from that point.
Pressing the rapid heating key only activates backup mode if a
fault with fault code 8 occurred previously. In standard mode
pressing the rapid heating key triggers the 48 hour heating mode
(See 5.5, “Rapid heating key”, pg. 14).
An interruption of the power supply will disable the backup mode
immediately. The heat pump will try to heat again after power is
restored. If the heat pump is still out of order the emergency back
up mode can be reactivated after 13 hours.
5.6 Emergency shutdown
In the event of an emergency, carry out the following steps:
 Interrupt the power supply by unplugging the appliance or by
shutting off the circuit breaker.
 Shut off the cold water supply.
 Immediately notify a qualified contractor, as the appliance
is not protected against corrosion while the power supply is
interrupted.
 Drain the water out of the tank if there is a power outage
longer than 2 days.
6. Maintenance and care
WARNING Electrocution
Do not insert objects through the grille into the interior
of the appliance.
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.
Appliance
components
Care and maintenance tips
Casing Use a damp cloth to clean the casing sections. Never
use abrasive or corrosive cleaning agents.
Air intake grille / air
discharge grille
Clean the air intake grille and air discharge grille
every six months. Cobwebs or other kinds of contami-
nation can restrict the air supply to the appliance.
DHW tank The DHW tank is equipped with a maintenance-free
impressed current anode to safeguard against cor-
rosion. The power supply must not be interrupted
while the appliance is filled with water to enable the
impressed current anode to provide protection. Oth-
erwise there is a risk of corrosion.
Electric booster ele-
ment
Have the electric booster element descaled from time
to time. This will extend the expected life of the elec-
tric booster element.
Appliance Have the safety assembly and the evaporator checked
regularly by a qualified contractor.
Condensate drain Undo the condensate drain. Check that the condensate
drain is clear and remove any dirt from the conden-
sate drain connection of the appliance.

OPERATION
Troubleshooting
16 | Accelera® 220-300 E www.stiebel-eltron-usa.com
7. Troubleshooting
Problem Cause Remedy
No hot water is
available.
No 220-240 V power to
the appliance.
Check that the appliance is
connected to the 220-240 V
power supply.
The circuit breaker in the
electric panel has tripped.
Check whether the circuit
breaker in the electrical panel
has tripped. If required, dis-
connect the appliance from
the power supply and replace
the circuit breaker. Contact
your contractor if the circuit
breaker blows again after the
appliance is connected to the
power supply.
The air intake or air dis-
charge of the appliance is
blocked.
Check the air intake grille
and air discharge grille for
contamination. Remove
any contamination (See 15,
“Maintenance and cleaning”,
pg. 27). Check thermostat
setting.
The ambient temperature
exceeds the upper ap-
plication limit (See 16.3,
“Data table”, pg. 33).
The appliance safety
equipment has responded
and the appliance has
switched off automati-
cally.
Wait for the appliance to cool
down. Call a qualified con-
tractor if the appliance does
not switch back on automat-
ically.
The ambient temperature
falls below the lower ap-
plication limit (See 16.3,
“Data table”, pg. 33).
The evaporator is current-
ly being defrosted.
Wait until the appliance
switches back on automati-
cally.
The appliance is
not heating the
DHW tank although
the heat pump
symbol is illumi-
nated.
The blocking time for
compressor has not
yet elapsed. Once the
compressor has been
switched off, it will only
be switched back on
again after the 20minute
compressor blocking time
has elapsed.
No action required.
The safety valve
of the cold water
supply line is drip-
ping.
These units are under
water mains pressure.
During the heat-up pro-
cess, expansion water will
drip from the safety valve.
Ensure that adequate
expansion volume was in-
stalled in the DHW loop.
Notify a qualified contractor if
water continues to drip when
heating is completed. Check
the sealing of the P&T valve if
a sand filter is used. If expan-
sion volume is too small, in-
stall a larger expansion tank.
The condensate
drain drips.
The surface temperature
of the evaporator is lower
than the dew point tem-
perature of the ambient
air. Condensate forms.
The amount of condensate
depends on the air humidity
level.
The room tem-
perature drops too
low.
Due to the heat pump
process the room tem-
perature drops.
The temperature drop de-
pends on the hot water
demand and the size of the
installation room. If the
temperature drop of the in-
stallation room is more than
7°F (4 °C) check the size of the
installation room.
Problem Cause Remedy
Service symbol
is continuously
illuminated.
See 7.1, “Fault codes”,
pg. 17
Notify a qualified contractor.
Service symbol
flashes and the
water does not
heat up.
See 7.1, “Fault codes”,
pg. 17
It is imperative that you notify
a qualified contractor.
The heat pump
symbol is
illuminated but the
compressor is not
running. The fan is
running.
The appliance is in defrost
mode.
No action required.
The “heat pump”
symbol is flashing.
There is a demand for
heat, but the compressor
is blocked from starting.
No action required. The
compressor is blocked for 20
minutes from starting again
after it has been switched off
in normal operation. The com-
pressor switches itself on au-
tomatically after the 20 minute
blocking time has elapsed.
The symbol stops flashing au-
tomatically.
The “electric
emergency/
booster heater”
symbol is flashing.
A temperature control-
ler has switched off the
“electric emergency/
booster heater” during
rapid heat-up.
No action required. The ap-
pliance continues the rapid
heat-up process using the
heat pump. The symbol stops
flashing when the controller
releases the “electric emer-
gency/booster heater”. The
symbol goes out when the
temperature throughout the
DHW cylinder reaches the set
temperature of 149 °F (65 °C).

www.stiebel-eltron-usa.com Accelera® 220-300 E | 17
ENGLISH
INSTALLATION
Troubleshooting
7.1 Fault codes
If the service/fault symbol is flashing or continuously illuminated
on the display, you can call up a fault code.
Repeatedly press the menu key until the
fault code is shown following the “chang-
ing units” menu.
Fault code appears
7.1.1 Fault code menu 1
Fault
code
Service
symbol
Fault description Remedy
0 No fault
2contin-
uously
illumi-
nated
The dome sensor has failed.
The temperature displayed
is measured by the integral
sensor. The appliance will
continue to work properly but
the amount of mixed water will
read as less than 2 gallons.
Call Stiebel Eltron for
more information if this
error occurs.
4contin-
uously
illumi-
nated
The integral sensor has failed.
The mixed water display will
not show the correct amount
but the appliance will continue
to work properly.
Call Stiebel Eltron for
more information if this
error occurs.
6flashing Dome sensor and integral sen-
sor failed. The appliance stops
heat delivery.
Contact a qualified con-
tractor.
8flashing The appliance has recognized
that the DHW tank is not heated
for 13 hours, despite there
being a demand.
You can continue to use
the appliance by activat-
ing backup mode. See
5.5.2, “Emergency back
up mode”, pg. 15. Call
Stiebel Eltron for more
information if this error
occurs.
16 contin-
uously
illumi-
nated
Short circuit impressed current
anode / protective anode failed
Immediately inform a
qualified contractor, as
the appliance is not pro-
tected against corrosion
if the impressed current
anode is faulty.
32 flashing The appliance is operating with
an empty tank or the appliance
is not delivering heat.
Fill the appliance with
water. The fault code dis-
appears and the appliance
starts.
The anode current is inter-
rupted. The appliance does not
heat up.
The contractor needs to
check the connection of
the impressed current
anode and the internal
wiring.
128 contin-
uously
illumi-
nated
No communication between
controller and display. The
most recently selected set val-
ues are active.
Check the connection be-
tween the display and the
control board.
256 flashing Manually activated Emergency
backup mode (only electric
booster element active).
See 5.5.2, “Emergency
back up mode”, pg. 15.
7.1.2 Fault code menu 2
Fault
code
Service
symbol
Fault description Remedy
E2 flashing Defrost sensor has failed. Call Stiebel Eltron for
more information if this
error occurs.
E64 flashing Temperature of the evaporator
is less than -4°F. May be due to
low air flow or a fan issue.
Call Stiebel Eltron for
more information if this
error occurs.
If more than a single fault occurs, the fault code gets summed.
Example: If both the dome sensor and integral sensor failed, the
display shows fault code6(=2+4).

18 | Accelera® 220-300 E www.stiebel-eltron-usa.com
INSTALLATION
Safety
Application scenarios for emergency mode
If the appliance shows fault code8, you can manually activate
emergency mode. If a different fault occurred previously, but did
not cause the appliance to switch off, the display may show a fault
code that is the result of several faults added together.
Listed below are the fault codes which will allow you to activate
emergency mode.
Fault code displayed Individual fault code(s)
8 8
10 Fault code 8 + fault code 2
12 8+4
24 8+16
26 8+2+16
28 8+4+16
138 8+2+128
140 8+4+128
152 8+16+128
154 8+2+16+128
156 8+4+16+128
When the appliance is operating in emergency backup mode, the
fault code shown is increased by 256.
Fault code displayed in
emergency backup mode
Individual fault code(s)
264 8+256
266 8+2+256
268 8+4+256
280 8+16+256
282 8+2+16+256
284 8+4+16+256
394 8+2+128+256
396 8+4+128-256
408 8+16+128+256
410 8+2+16+128+256
412 8+4+16+128+256
Notifying a qualified contractor
If you cannot remedy the fault, 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 appliance above the "DHW outlet" connection.
Sample type plate
000000-0000-00000
D0000035352
1
0
0
0
0
0
0
0
1 Serial number on the type plate
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 your warranty claim, use only original 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 chapter "Specification".
8.3 Incorrect use
The following are not permitted:
- Do not install the water heater on non-load bearing floors
- Do not install the water heater where it is at risk from frost
- Do not install in rooms where the water heater is at risk from
explosions as a result of dust, gases or vapors
- Do not ignore safety clearances and safety zones
- Do not incorrectly install the power connection
- Do not operate the water heater with an open casing
- Do not heat anything other than potable water
- Do not fill with any other refrigerant type, use only R134a
8.4 Qualification
In this manual, qualified individuals will be described as the “li-
censed installer”.
Licensed installers are responsible for adherence to all currently
applicable regulations during installation and initial start-up.
8.4.1 Licensed installer
Licensed installers are specially trained in their field. Licensed
installers work on systems on the basis of their training, knowl-
edge and experience, as well as their knowledge of applicable
standards and regulations. They are able on their own to recognize
and prevent possible problems.
8.4.2 Electrician (licensed)
An electrician is a licensed installer who meets the above require-
ments with regard to electrical-related installations.
8.4.3 Plumber (licensed)
A plumber is a licensed installer who meets the above require-
ments with regard to water-related installations.

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ENGLISH
INSTALLATION
Appliance description
8.4.4 Customer service
For customer service inquiries, please contact Stiebel Eltron di-
rectly at 800-582-8423
9. Appliance description
The heat pump unit is located in the upper section of the appliance.
The DHW tank is located in the lower section of the appliance.
9.1 Standard delivery
The following are delivered with the appliance:
- Condensate drain
- T&P valve, 100 psi at 210 °F (99 °C), leak tested
9.2 Required accessories
Various safety assemblies are available that need to be selected
subject to the respective static pressure. These type-tested safe-
ty assemblies protect the appliance against unacceptable excess
pressure.
- A 70 psi / 4.8 bar pressure reducing valve must be installed
to ensure the pressure of the incoming water line never ex-
ceeds 70 psi / 4.8 bar.
- A 5 gallon (19 liter) potable water expansion tank with air
pre-charge set to 70 psi / 4.8 bar must be installed on the
incoming water line.
9.3 Further accessories
– Condensate pump (if there is a minor base slope for draining
the condensate, use a condensate pump)
10. Preparations
10.1 Transport
!
CAUTION Injury
 Take note of the weight of the appliance.
 Use suitable transport aids (e.g. a hand truck) and
enough personnel for transportation.
!
Material losses
The appliance is top heavy and can easily tip over.
 Make sure the unit is not tilted.
 Only set the appliance down on an even base.
!
Material losses
The appliance casing is not designed to withstand strong
forces. Incorrect handling can lead to considerable loss.
Observe the information on the packaging.
Leave the appliance in its packaging and on the pallet while trans-
porting. This enables horizontal transport and protects the appli-
ance during transport.
Remove the packaging shortly before the installation and do not
unpack the appliance until it has arrived in the final installation
room.
Vehicular transport
!
Material losses
Storing and transporting the appliance vertically is rec-
ommended.
The appliance may be transported horizontally on good roads.
Strong shocks to the appliance are not permissible.
!
Material losses
The duration in a horizontal position may not exceed
more than 24 hours.
If the appliance was transported horizontally, it must be
placed in a vertical position and allowed to remain that
way for at least one hour before commissioning.
 Observe the information on the packaging.
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.
10.2 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.
10.3 Installation site
The appliance is not approved for outdoor installation except for
garages.
To prevent appliance damage:
- The installation location must be free from flammable, highly
combustible gases and substances, as well as high levels of
dust.

20 | Accelera® 220-300 E www.stiebel-eltron-usa.com
INSTALLATION
Preparations
- The installation room must be free from the risk of frost.
- The intake temperature of the appliance must be within the
permissible application limits (See 16.3, “Data table”, pg.
33).
- 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 16.3, “Data table”, pg.
33). A floor with insufficient foundation pressure capacity
is in danger of collapse. If the appliance is not evenly bal-
anced, there may be a risk of appliance damage.
- The size of the installation room must correspond to the ap-
plication limits of the appliance (See 10.5, “Minimum clear-
ances”, pg. 21 and See 16.3, “Data table”, pg. 33).
- Observe the safety clearances and protection zones.
- Always leave sufficient distance to provide access for installa-
tion, maintenance and cleaning. Observe the required mini-
mum clearances (See 10.5, “Minimum clearances”, pg. 21).
- Ensure that the operation of other equipment in the installa-
tion room is not impaired.
- To reduce the pipe runs, install the unit close to the kitchen
or bathroom.
- To prevent disturbance from operating noise, never install
the appliance close to bedrooms.
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
Note
The performance data indicated for this appliance has
been determined in line with the relevant standard at an
air temperature of 59°F (15°C). Below this temperature,
the efficiency of the appliance decreases.
Note
It is possible to improve the efficiency of the appliance by
utilizing the waste heat and humidity from other appli-
ances to heat the DHW tank, e.g. boilers, tumble dryers
or freezers.
Sound emissions
The air intake and air discharge sides of the appliance emit more
noise than other sides of the housing.
 Never direct the air intake or air discharge towards
noise-sensitive rooms of the house, e.g. bedrooms.
Note
For details on noise emission, see chapter "See 16.3,
“Data table”, pg. 33".
10.4 Siting the appliance
 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.
1. 2.
D0000034798
1
1 Metal bracket fixing bolt
 Remove the fixing bolts of the metal brackets from the pallet.
 Push the metal brackets a little towards the tank center, to
unhook them from the appliance feet.
 Pull the metal brackets out from underneath the appliance.
!
Material losses
Take note of the appliance's weight and top-heaviness.
 Slightly tip the appliance and carefully roll the appliance off
the pallet.
 Bring the appliance in its final location.