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.

2| Accelera® 220-300 E www.stiebel-eltron-usa.com
CONTENTS
ACCELERA®220 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. Appliance description _____________________________________ 10
3.1 Heating the DHW tank _________________________________________ 11
3.2 Appliance operation outside the application limits______ 11
3.3 Frost protection _________________________________________________ 11
4. Settings _____________________________________________________ 12
4.1 Display and controls____________________________________________ 12
4.2 Settings ___________________________________________________________ 12
4.3 Calling up fault codes__________________________________________13
4.4 Rapid heating key ______________________________________________ 13
4.5 Emergency shutdown__________________________________________ 14
5. Maintenance and care _____________________________________ 14
6. Troubleshooting ____________________________________________ 15
6.1 Fault codes _______________________________________________________ 16
INSTALLATION
7. Safety________________________________________________________ 17
7.1 General safety instructions ___________________________________ 17
7.2 Instructions, standards and regulations ___________________ 17
7.3 Incorrect use_____________________________________________________ 17
7.4 Qualification _____________________________________________________ 17
8. Appliance description _____________________________________ 17
8.1 Standard delivery_______________________________________________ 17
8.2 Required accessories __________________________________________ 17
8.3 Further accessories_____________________________________________ 17
9. Preparations________________________________________________ 17
9.1 Transport _________________________________________________________ 17
9.2 Storage____________________________________________________________ 18
9.3 Installation site__________________________________________________ 18
9.4 Siting the appliance ____________________________________________ 19
9.5 Minimum clearances___________________________________________ 19
10. Installation__________________________________________________ 20
10.1 Water connection _______________________________________________ 20
10.2 Condensate drain _______________________________________________ 20
10.3 Power supply ____________________________________________________ 20
10.4 Assembling the appliance ____________________________________ 22
11. Commissioning _____________________________________________ 22
11.1 Commissioning__________________________________________________ 22
11.2 Recommissioning_______________________________________________ 22
12. Shutting down______________________________________________ 22
13. Troubleshooting ____________________________________________ 22
13.1 Fault table ________________________________________________________ 23
13.2 Resetting the safety pressure limiter _______________________ 23
13.3 Resetting the high limit safety cut-out _____________________ 23
13.4 Motor overload relay___________________________________________ 23
14. Maintenance and cleaning ________________________________ 23
14.1 Removing the appliance cover _______________________________ 23
14.2 Removing the casing ring_____________________________________ 24
14.3 Cleaning the evaporator_______________________________________ 24
14.4 Draining the tank _______________________________________________ 24
14.5 Descaling the electric booster element ____________________ 25
14.6 Protective anode ________________________________________________ 25
14.7 Valves _____________________________________________________________ 25
14.8 Replacing the power cable ___________________________________ 25
14.9 Fitting the casing ring _________________________________________ 25
14.10 Fitting the appliance cover ___________________________________ 25
15. Specification ________________________________________________ 26
15.1 Dimensions and connections_________________________________ 26
15.2 Wiring diagram _________________________________________________ 28
15.3 Data table ________________________________________________________ 29
16. Limited Warranty___________________________________________ 30

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ENGLISH
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:
Register your product
NOTE:
You must register this product within 90 days
of purchase on our web site in order to acti-
vate 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:
000000-0000-00000
D0000035352
1
0
0
0
0
0
0
0
0
1 Serial number on the type plate
Type, Example: Accelera 220 E (the type plate can be found
on the appliance above the “DHW outlet” connection).
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.

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QUICK START-UP GUIDE
General information
ACCELERA® 220 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
10´. 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 rec-
ommended, 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.
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. 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 10.1, “Water connec-
tion”, pg. 20).
Condensate drain:
Run the condensate drain connection directly into a drain or use a condensate pump to drain into a suitable location (See 10.2, “Con-
densate drain”, pg. 20).
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 10.3, “Power supply”, pg. 20).

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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:
An object
next to the
unit must
be less than
42˝ high
2´
(0.6 m)
2´
(0.6 m)
8˝ (0.2 m)
8˝
(0.2 m)
6´
(1.8 m)
≤42˝
(1.1 m)
› 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 the
water heater next to
another appliance, it
cannot be taller than 42
inches. Otherwise, it will
obstruct air flow to and
from the unit.
› 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, 0.69 MPa @ 99°C (100 psi @ 210°F) (supplied with unit)
6 Expansion tank (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˝ NPT to ½˝ barbed elbow, supplied with unit)
12 Drain valve (supplied by installer)
13 Drain pan (supplied by installer)
14 Condensate spillover

OPERATION
General information
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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
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 15.3, “Data table”, pg. 29).
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. 29)
- 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 ap-
pliance 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
Accelera 220 E
Stiebel Eltron Inc.
17 West Street
West Hatfield, MA 01088, USA
800.582.8423
[email protected]
Conforms to UL STD. 1995
Conforms to UL STD. 174
Certified to CAN/CSA STD. C22.2 No.236-05
Certified to CAN/CSA STD. C22.2 No.110-94
Part number/code article: 233058
Electrical/électrique
Voltage/tension: Single phase 220-240 V
Frequency/fréquence: 50 / 60 Hz
Breaker/disjoncteur: 15 A
Pnmax (rated power input)/puissance nominale: 2200 W
Maximum allowable ratings/courant nominal: 2200 W, 9.17 A
Protection class/indicie de protection: IP 24
Heat pump/pompe à chaleur:
PN(Air 107.6°F / Water 149°F): 0.54 kW
Refrigerant/frigorigène: R-134a
Refrigerant charge/frigorigène poids de remplissage: 1.874 lb / 850g
Max. operating pressure/max. pression de service: 348.1 PSI / 2,400 kPa
Lock rotor current/puissance blockade: 15.3 A
MCA: 14 A
Rated compressor load/courant nominale du compresseur: 2.5 A
Motor fan/moteur de ventilateur: 24 W
DHW cylinder/DHW cylindre:
Backup heating element/chauffage d'appoint: 1690 W
Max. operating pressure/max. pression de service: 87 PSI / 600 kPa
Max. operating temperature/max. temperature de service: 168.8°F / 76°C
Tank material/matériau réservoir: Steel
Nominal capacity/capacité nominale: 58.12 gal / 220 l
Tank test pressure/contrôle de réservoir: 130.5 pSI / 900 kPa
No.:#### / ######
Made in EU/Fabriqué en UE
Read the instructions carefully.
Tested for leaks.
Lira attentivement la notice.
Étanchéité testé.
285872-34892
XXXXXX-XXXX-XXXXXX
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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ENGLISH
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 causarquemaduras
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 servicio calificado.
er
AQUA CALIENTE
ABRASAR
52 125
7. Gasket connection information label
311804-38055
For reason of corrosion protection use
flat gasket ring. Never seal threadshemp
(equipment Damage!).
Pour des raisons de protection contre la
corrosion, le raccordement est à réaliser
par joints plats. L'étanchéïfication au
chanvre n'est pas autorisée
(dommages au matériel!).
Para la protección contra la corrosión use
sellos planos de los tubos. Una unión
con cáñamo no está permitida
(riesgo de daño del equipo!).
8. Pressure & temperature relief valve information label
315321-38055
Relief valve
Plumber:
The relief valve installation must 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 waterheater is retrofitted with asupplemental heatelement
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
Appliance description
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. 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.
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
15.3, “Data table”, pg. 29). 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
condenser. The cooled refrigerant passes a filter dryer. There, the
refrigerant indirectly transfers heat to the DHW tank and the liquid
refrigerant is routed to a two-flood evaporator. An expansion valve
then reduces the still prevalent pressure 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 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.

OPERATION
Appliance description
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3.1 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 it has reached the set temperature. In this case the deviation
of the average tank temperature from the set value is greater than
the start hysteresis.
For information on the heat-up time, See 15.3, “Data table”, pg.
29. 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 15.3, “Data table”, pg. 29).
3.1.1 Electric booster element
Heat pump operation will be interrupted if the application limits
are exceeded in heat pump mode. The electric emergency/booster
heater takes over the DHW heating using the selected set tempera-
ture. Once the appliance is back within the application limits, the
electric emergency/booster heater switches off and DHW heating
continues with the heat pump.
In emergencies you can start the electric emergency/booster heat-
er should the appliance develop a fault and the fault code is higher
than 256. See 4.4.1, “Comfort heating”, pg. 13.
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 4.4.2, “Emergency back up
mode”, pg. 14.
3.2 Appliance operation outside the application
limits
3.2.1 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.
 To guarantee fault-free operation of the appliance, make sure
you operate the appliance within its application limits (See
15.3, “Data table”, pg. 29).
Note
Heat-up times are longer while the evaporator is defrost-
ing.
3.2.2 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
15.3, “Data table”, pg. 29).
3.3 Frost protection
The appliance activates a frost 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.

OPERATION
Settings
12 | Accelera® 220-300 E www.stiebel-eltron-usa.com
4. Settings
4.1 Display and controls
Note
The back-light of the display will illuminate for 15 seconds
after pressing any button.
elctronic comfort
1
3
5
12
10
8
26_03_13_0006_
comfor
t
om
f
or
t
4
2
7
6
11
e
lctron
2
2
1
9
1 Set temperature symbol
2 Amount of 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
3 Plus key
4 Minus key
5 Service/error symbol
6 Electric booster element symbol
7 Heat pump symbol
8 Rapid heating key
9 Set temperature2 symbol
10 Menu key
11 Amount of mixed water symbol
12 Actual temperature symbol
The "electric booster element" and "heat pump" symbols are dis-
played when these appliance components are active. The display
of these symbols does not necessarily mean that the electric boost-
er element and the heat pump are running.
Service/fault symbol
Note
Notify your contractor if the service/fault symbol ap-
pears on the display. Continuous illumination of the
symbol indicates that the fault is not preventing appli-
ance operation.
A flashing service/fault symbol indicates that the water
is not being heated and that it is essential you notify
your contractor.
4.2 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.
4.2.1 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 < 10 l.
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.
4.2.2 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.
4.2.3 Set temperature1
Note
For reasons of legionella prevention, never set the DHW
temperature lower than 124°F/50°C).
The set temperature1 is the DHW temperature to which the ap-
pliance regulates if no external signal transmitter is connected
and active. Set temperature1 is set to 131°F/55°C at the factory.
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.

OPERATION
Settings
www.stiebel-eltron-usa.com Accelera® 220-300 E | 13
ENGLISH
Adjust set temperature1 from 69 to
149°F / 20.5 to 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).
Frost protection
If the set temperature is set to less than
69°F/20.5°C, only frost protection re-
mains active. The water heater will not
run.
4.2.4 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
regulates 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.
The display of set temperature2 is de-
noted with an "N".
Adjust set temperature2 from 69 to
149°F / 20.5 to 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 low tariff
transmission of a utility.
This set temperature2 is activated when a phase (LF signal) is
present at terminal X0/LF (See 10.3.1, “Connection with external
signal transmitter”, pg. 21). While activated, set temperature2
replaces the standard set DHW temperature ("set temperature1").
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 LF signal ends. 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)
A1
00 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 t [min]
B11
0 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
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 condition.
4.3 Calling up fault codes
Based on the set temperature2 menu,
press the menu key once to get to the
fault code menu. A fault code will appear
if a fault has occurred. If no error has
occurred, this menu is not available.
See 6.1, “Fault codes”, pg. 16.
4.4 Rapid heating key
Press the rapid heating key.
The heat pump and electric booster ele-
ment symbols appear.
4.4.1 Comfort heating
Normally, the rapid heating key is used to activate the comfort
heating function, which enables the water heater to satisfy an
unexpectedly high DHW demand without changing any of the ap-
pliance's standard settings.
When comfort heating is activated by pressing the rapid heating
key, the heat pump and the electric booster element will start
in parallel, irrespective of the selected set temperature. To save
energy, the electric booster element switches off as soon as a
temperature of 149°F/65°C has been achieved in the upper tank
section (rapid heating).

OPERATION
Maintenance and care
14 | Accelera® 220-300 E www.stiebel-eltron-usa.com
The heat pump remains on and the comfort heating function re-
mains active until a temperature of 149°F/65°C) has been achieved
in the entire DHW tank (comfort heating). The appliance then au-
tomatically switches back to the previously set parameters.
Note
The electric booster element and heat pump symbols are
displayed until the comfort heating function has termi-
nated.
During comfort heating, the electric booster element
symbol is displayed until the heat pump has heated the
entire tank to 149°F/65°C and the function is terminated,
even though the electric booster element switches off
when the 149°F/65°C) has been achieved in the upper
tank section.
Note
If comfort heating has been activated, it can be canceled
by reducing the set temperature.
 Hold down the minus key, until you hear a clicking
noise caused by the heat pump and booster heater
switching off. The set temperature will jump back to
the value that was selected before comfort heating
was activated.
4.4.2 Emergency back up mode
If the heat pump is out of order, it is possible to use the electric
booster element in back up mode to ensure hot water production.
The electric supply to the compressor shuts down if the water
temperature increase is less than 0.5°F/0.25°C) in a time frame
of 13 hours. In this case the fault code 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 6.1, “Fault codes”, pg. 16). The fault key continues
to flash. The electric booster element is activated.
The current set temperature (set temperature1 or set tempera-
ture2) is ignored. In emergency mode, the appliance operates
with a fixed set temperature of 104°F/40°C). After a one-off ac-
tivation of the function via the rapid heating key, this function
remains active for 7days.
Following 7days of backup operation, the electric booster element
is deactivated. The fault code shown on the display decreases by
256.
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 afresh 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 only triggers a one-off heating of
the DHW tank for a single instance.
An interruption of the power supply will disable the back up mode
immediately. The heat pump will try to heat again for a duration of
13 hours after the power outage. After 13 hours without a water
temperature increase, the flashing service key occurs again and
the back up function may be activated.
4.5 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.
5. 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
www.stiebel-eltron-usa.com Accelera® 220-300 E | 15
ENGLISH
6. Troubleshooting
Problem Cause Remedy
No hot water is
available.
No power to the appli-
ance.
Check that the appliance
is connected to the 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.
No hot water is
available.
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 14, “Main-
tenance and cleaning”, pg.
23).
The ambient temperature
exceeds the upper ap-
plication limit (See 15.3,
“Data table”, pg. 29).
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 15.3,
“Data table”, pg. 29).
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.
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.
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.
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 pro-
cess the room temperature
drops. The temperature drop
depends 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.
Service symbol
is continuously
illuminated.
See 6.1, “Fault codes”,
pg. 16
Notify a qualified contractor.
Problem Cause Remedy
Service symbol
flashes and the
water does not
heat up.
See 6.1, “Fault codes”,
pg. 16
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).

OPERATION
Troubleshooting
16 | Accelera® 220-300 E www.stiebel-eltron-usa.com
6.1 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 set tem-
perature2.
Fault code appears
Fault
code
Service
symbol
Fault description Remedy
0 No fault
2continu-
ously illu-
minated
The dome sensor has failed.
The temperature displayed is
measured by the integral sen-
sor. The appliance will continue
to work properly.
Call Stiebel Eltron for
more information if
this error occurs.
4continu-
ously illu-
minated
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
contractor.
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 acti-
vating backup mode.
See 4.4.2, “Emergency
back up mode”, pg.
14
16 continu-
ously illu-
minated
Short circuit impressed current
anode / protective anode failed
Immediately inform a
qualified contractor,
as the appliance is not
protected against cor-
rosion 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
disappears 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 continu-
ously illu-
minated
No communication between
controller and display. The
most recently selected set val-
ues are active.
256 flashing Manually activated Emergency
backup mode (only electric
booster element active).
See 4.4.2, “Emergency
back up mode”, pg.
14.
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).
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
0
0
1 Serial number on the type plate

www.stiebel-eltron-usa.com Accelera® 220-300 E | 17
ENGLISH
INSTALLATION
Safety
INSTALLATION
7. Safety
Only a qualified contractor should carry out the installation, com-
missioning, maintenance and repair of the appliance.
7.1 General safety instructions
To prevent your warranty claim, use only original accessories and
spare parts. If you need spare parts, call 800.582.8423.
7.2 Instructions, standards and regulations
Note
Observe all applicable national and regional regulations
and instructions.
Take note of the appliance type plate and chapter "Specification".
7.3 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 Freon, use only R134a
7.4 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.
7.4.1 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.
7.4.2 Electrician (licensed)
An electrician is a licensed installer who meets the above require-
ments with regard to electrical-related installations.
7.4.3 Plumber (licensed)
A plumber is a licensed installer who meets the above require-
ments with regard to water-related installations.
7.4.4 Customer service
For customer service inquiries, please contact Stiebel Eltron di-
rectly at 1-800-582-8423
8. 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.
8.1 Standard delivery
The following are delivered with the appliance:
- Condensate drain
- T&P valve, 100 psi at 210°F/99°C
8.2 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.
- Pressure reducing valve (70 psi) if the water mains pressure
exceeds this
-Expansiontank
8.3 Further accessories
– Condensate pump (if there is a minor base slope for draining
the condensate, use a condensate pump)
9. Preparations
9.1 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.

18 | Accelera® 220-300 E www.stiebel-eltron-usa.com
INSTALLATION
Preparations
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, leave it to
rest in a vertical position 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.
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 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.
- 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 15.3, “Data table”, pg.
29).
- 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.
29). 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
application limits of the appliance (See 9.5, “Minimum clear-
ances”, pg. 19 and See 15.3, “Data table”, pg. 29).
- Observe the safety clearances and protection zones.
- Always leave sufficient distance to provide access for instal-
lation, maintenance and cleaning. Observe the required min-
imum clearances (See 9.5, “Minimum clearances”, pg. 19).
- 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 15.3,
“Data table”, pg. 29".

www.stiebel-eltron-usa.com Accelera® 220-300 E | 19
ENGLISH
INSTALLATION
Preparations
9.4 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.
9.5 Minimum clearances
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:
An object
next to the
unit must
be less than
42˝ high
2´
(0.6 m)
2´
(0.6 m)
8˝ (0.2 m)
8˝
(0.2 m)
6´
(1.8 m)
≤42˝
(1.1 m)
 Maintain the minimum clearances.
!
Material losses
The top of the appliance should be made horizontal.
 Level the appliance horizontally using the height-ad-
justable feet.
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20 | Accelera® 220-300 E www.stiebel-eltron-usa.com
INSTALLATION
Installation
10. Installation
!
WARNING Injury
Incorrect installation can lead to serious personal injury
or material losses.
Before any work, ensure sufficient clearances for the
installation.
Handle sharp-edged components carefully.
10.1 Water connection
!
Material losses
Carry out all water connection and installation work in
accordance with local plumbing regulations.
The following material combinations are approved for pipework
installations:
Cold water inlet DHW outlet
Copper pipe Copper pipe
Steel pipe Steel pipe or copper pipe
PEX tubing PEX tubing
 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.
!
Material losses
To protect the connection nipples against corrosion the
water tube connection must be made with plumber’s
thread seal tape (PTFE). The use of hemp on nipple
threads is not permissible.
10.1.1 Safety valve
The appliance is a sealed unvented DHW tank. The appliance is
supplied with a temperature and pressure relief valve that has
been factory installed and leak-tested.
 Install a type-tested safety valve in the cold water supply
line. 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.
 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.
 Size the drain in a way that water can drain off unimpeded
when the safety valve is fully opened.
 Ensure that the discharge pipe of the safety valve is open to
atmosphere.
 Fit the discharge pipe of the safety valve with a constant
downward slope and in a room free from the risk of frost.
10.1.2 Pressure reducing valve
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).
10.1.3 Check valve
Install a check valve in the cold water line (after the pressure re-
ducing valve if installed). This check valve is necessary to prevent
water from flowing backwards into the cold water piping.
10.1.4 Drain valve
 Install a suitable drain valve at the lowest point in the cold
water inlet line.
10.1.5 Thermal insulation
 Insulate the DHW line against heat loss in accordance with
locally applicable regulations.
10.2 Condensate drain
Install a condensate drain hose to remove the condensate which
forms.
 Connect the condensate drain included in the standard deliv-
ery to the “condensate drain” connection.
 Connect a condensate drain hose to the condensate drain
bend.
!
Material losses
Ensure condensate drain cannot retain water.
 Use a condensate drain hose with a diameter great-
er than the diameter of the condensate drain bend.
 Ensure the condensate drain hose is not bent.
 Route the condensate drain hose with a continuous
base slope.
The condensate drain must be open to the atmosphere.
 Use a suitable condensate pump if there is insufficient base
slope. Observe the building characteristics.
10.3 Power supply
WARNING Electrocution
Carry out all electrical connection and installation work
in accordance with national and regional regulations.
WARNING Electrocution
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 double
terminal with at least 1/8˝/4 mm contact gap. Contactors,
disconnect switches or circuit breakers can be used for
this.
WARNING Electrocution
 Observe the safety regulations to prevent contact
with dangerous 'live' parts.