STIEBEL ELTRON Accelera 300 E User Manual [en, es, fr]

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 499, UL 1995, UL 94-5 VA, UL 174
Certifi ed to CAN/CSA C22.2 No. 110

Conforme a ANSI/UL 499, UL 1995, UL 94-5 VA, UL 174
Certifi cación con CAN/CSA Std. C22.2 No. 110

Conforme à la norme ANSI/UL Std. 174
Certifi é à la norme CAN/CSA Std. C22.2 No. 110

Tested and certifi ed by WQA to NSF/ANSI372
for lead free compliance.

Probado y certifi cado por WQA NSF/ANSI 372 para
el cumplimiento de las regulaciones sin plomo.

Testé et certifi é par WQA à la NSF/ANSI 372 pour
une utilisation sans plomb.

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 _____________________________________________________ 11

4.1 Display and controls ____________________________________________11

4.2 Settings ___________________________________________________________ 11

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 ____________________________________________ 14

6.1 Fault codes _______________________________________________________ 15

INSTALLATION

7. Safety ________________________________________________________ 16

7.1 General safety instructions ___________________________________16

7.2 Instructions, standards and regulations ___________________ 16

7.3 Incorrect use _____________________________________________________ 16

7.4 Qualifi cation _____________________________________________________ 16

8. Appliance description _____________________________________ 16

8.1 Standard delivery _______________________________________________ 16

8.2 Required accessories __________________________________________ 16

8.3 Further accessories_____________________________________________16

9. Preparations ________________________________________________ 16

9.1 Transport _________________________________________________________ 16

9.2 Storage ____________________________________________________________ 17

9.3 Installation site __________________________________________________ 17

9.4 Siting the appliance ____________________________________________18

9.5 Minimum clearances ___________________________________________ 18

10. Installation __________________________________________________ 19

10.1 Water connection _______________________________________________ 19

10.2 Condensate drain _______________________________________________ 19

10.3 Power supply ____________________________________________________ 20

10.4 Assembling the appliance ____________________________________ 21

11. Commissioning _____________________________________________ 21

11.1 Commissioning __________________________________________________ 21

11.2 Recommissioning _______________________________________________ 21

12. Shutting down ______________________________________________ 22

13. Troubleshooting ____________________________________________ 22

13.1 Fault table ________________________________________________________ 22

13.2 Resetting the safety pressure limiter _______________________22

13.3 Resetting the high limit safety cut-out _____________________22

13.4 Motor overload relay ___________________________________________ 22

14. Maintenance and cleaning ________________________________ 23

14.1 Removing the appliance cover _______________________________23

14.2 Removing the casing ring _____________________________________ 23

14.3 Cleaning the evaporator _______________________________________ 24

14.4 Draining the tank _______________________________________________24

14.5 Descaling the electric booster element ____________________ 24

14.6 Protective anode ________________________________________________ 24

14.7 Valves _____________________________________________________________ 24

14.8 Replacing the power cable ___________________________________ 24

14.9 Fitting the casing ring _________________________________________ 24

14.10 Fitting the appliance cover ___________________________________ 25

15. Specifi cation ________________________________________________ 26

15.1 Dimensions and connections _________________________________26

15.2 Wiring diagram _________________________________________________ 28

15.3 Data table ________________________________________________________ 29

16. Limited Warranty___________________________________________ 30

2 | Accelera® 220-300 E www.stiebel-eltron-usa.com

SPECIAL INFORMATION

This manual includes important information regarding the safe
and effi cient 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 ver­sion. 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

-Incorrect use

- Installation of water heater by unqualifi ed personnel

- Unauthorized modifi cations

- 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 copy­right.

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.

Register your product

NOTE:

You must register this product within 90 days
of purchase on our web site in order to acti­vate any standard warranty or to be eligible for
the extended warranty. Go to our website at:
www.stiebel-eltron-usa.com and click on “Register Your
Product.”

Before beginning the registration process, we suggest that you
gather the necessary information as follows:

1

000000-0000-00000

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.

ENGLISH

D0000035352

We hold the copyright:

Stiebel Eltron, Inc.
17 West Street | West Hatfi eld, MA 01088
Tel. [phone] | Fax [phone]
Email [e-mail]
www.stiebel-eltron-usa.com

Should you have any questions regarding the installation or op­eration 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:

www.stiebel-eltron-usa.com Accelera® 220-300 E | 3

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 fi ts 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 rec­ommended, 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 ser­viceability. 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. Install a 70 psi pressure
reduction valve if the water pressure exceeds 70 psi (See 10.1, “Water connection”, pg. 19)

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, “Con­densate drain”, pg. 19).

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).

4 | Accelera® 220-300 E www.stiebel-eltron-usa.com

QUICK START-UP GUIDE

Required room dimensions and clearances

› 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 fl ow to and
from the unit.

Minimum room volume:

2

800 ft

(22.7 m2, 3 m x 3 m x 2.4 m)

, 10´ x 10´ x 8´

Air flow
exhaust

6´ (1.8 m)

An object
next to the
unit must

≤42˝

(1.1 m)

be less than
42˝ high

14˝

(0.4 m)

ENGLISH

Air flow

intake

2´ (0.6 m)

› Failure to follow

installation instructions
will void the factory
warranty.

Acceptable positioning, vent parallel to a wall:

8˝ (0.2 m)

6´ (1.8 m)

Air flow
exhaust

2´ (0.6 m)

Air flow

intake

Acceptable positioning, vent parallel to a wall in a corner:

8˝ (0.2 m)

Air flow

intake

8˝

(0.2 m)

2´

(0.6 m)

2´

(0.6 m)

6´

Air flow

(1.8 m)

www.stiebel-eltron-usa.com Accelera 220-300 E | 5

exhaust

QUICK START-UP GUIDE

Plumbing connections

3

HMC

Hot water

1

8

7

9

11

14

4

5

Cold water

6

2

10

12

13

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 (optional, supplied by installer)
10 Cold water connection (1˝ NPT)
11 Condensate drain (elbow supplied with unit)
12 Drain valve (supplied by installer)
13 Drain pan (supplied by installer)
14 Condensate spillover

6 | Accelera 220-300 E www.stiebel-eltron-usa.com

OPERATION

General information

OPERATION

1. General information

The chapters “Special information” and “Operation” are intended
for appliance users and qualifi ed contractors.

The chapter “Installation” is intended for qualifi ed contractors.

Note

Read these instructions carefully before using the appli­ance 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 re­quired 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 inappropri­ate. 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 qualifi ed contractors should carry out the electrical work and
installation of this appliance. Qualifi ed contractors are responsible
for adherence to all applicable regulations.

Operate the appliance only when fully installed and with all safety
equipment fi tted.

WARNING Injury

!

The appliance may be used by children aged 8 and up and
persons with reduced physical, sensory or mental capa­bilities or a lack of experience and know-how, provided
that t hey are supervised or they have b een instruc ted 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 com­ponents 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 qualifi ed contractor.

WARNING Scalding
The water in the DHW tank can be heated to tempera­tures 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 protec­tive working clothing and safety gloves.
The pipework connected to the DHW outlet of the ap­pliance can reach temperatures in excess of 149°F/65°C.

WARNING Scalding
The appliance is fi lled with refrigerant at the factory.
In case of leaking refrigerant, avoid coming into contact
with the refrigerant or inhaling the released vapors. Ven­tilate 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 tempera­tures in this water heater, install temperature and pres­sure protective equipment required by local codes and
no less than a combination temperature and pressure
relief valve certifi ed by a nationally recognized testing
laboratory that maintains periodic inspection of produc­tion of listed equipment or materials, as meeting the re­quirements for Relief Valves and Automatic Gas Shutoff
Devices for Hot Water Supply Systems, ANSI Z21.22. This
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 fl oor, and does not contact
any live electrical part. The discharge opening must not
be blocked or reduced in size under any circumstances.

ENGLISH

www.stiebel-eltron-usa.com Accelera® 220-300 E | 7

OPERATION

Safety

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 fl amma­ble. 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 fl ow. There should be no smoking or
open fl ame 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
fi lled.

2.5 Appliance labels

1. Type plate label for the Accelera 220 E

No.:#### / ######

Accelera 220 E

Part number/code article: 233058
Electrical/électriqu e

Voltage/tension: Single phase 220-240 V
Frequency/fréquence: 50 / 60 Hz
Breaker/disjoncteur: 15 A
P

(rated power input)/puissance nominale: 2200 W

nmax

Maximum allowable ratings/courant nominal: 2200 W, 9.17 A
Protection class/i ndicie de protec tion: IP 24

Heat pump/pompe à chaleur:

(Air 107.6°F / Water 149°F): 0.54 kW

P

N

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 curre nt/puissance blockade : 15.3 A
MCA: 14 A
Rated compressor load/courant nominale du compresseur: 2.5 A
Motor fan/moteur d e ventilateu r: 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 materi al/matériau réservoir: Steel
Nominal capacity/capacité nominale: 58.12 gal / 220 l
Tank test pressure/contrôle de réservoir: 130.5 pSI / 900 kPa

2. Condensate drain information label

Condensate

Condenso

Condensat

285872-34892

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

Stiebel Eltron Inc.
17 West Street
West Hatfield, MA 01088, USA

800.582.8423
[e-mail]

Read the instructions carefully.
Tested for leaks.

Lira attentivement la notice.
Étanchéité testé.

Made in EU/Fabriqué en UE

315683-38055

311801-38055

XXXXXX-XXXX-XXXXXX

Material losses

!

Keep the appliance installation room free from air con­taminated with oil or salt and corrosive or explosive sub­stances.

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

3. Hot water outlet location label

Hot Water Outlet

Salida de agua caliente

Sortie eau chaude

4. Cold water outlet location label

Cold Water Inlet

Entrada para agua fría

Entrée eau froide

5. Power connection information label

!Attention!

Must connect to

Power supply

Disconect power supply

Before opening the cover

240 V, 15 A

Double-pole

Circuit breaker

311803-38055

311802-38055

8 | Accelera® 220-300 E www.stiebel-eltron-usa.com

OPERATION

Safety

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 ébo u i llantage

Les enfants, les personnes handicapées e t 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 do uche .

Des dispositifs de limi ta ti on de te mpé r a t ur e s on t
disponibles. Voir la notice d'emploi.

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 e scaldadura.

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.

Agua muy ca lien te p uede ca us ar quem a d ur a s
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 necesit a a justar la regulació n,
contácte al técnico de servicio calificado.

ATTENTION

ADVERTENCIA

er

AQUA CALIENTE

ABRASAR

52

125

7. Gasket connection information label

For reason of corrosion protection use
flat gasket ring. Never seal threadshemp
(equipment Damage!).

Para la protección contra la corrosión use
sellos planos de los tubos. Una unión
con cáñamo no está permitida
(riesgo de daño del equipo!).

311804-38055

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!).

8. Pressure & temperature relief valve information label

Relief valve

Plumber:
The re lief valve i nsta llati on m ust b e fitted to this s oc ke t.
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

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.

ENGLISH

315321-38055

315322-38055

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OPERATION

Appliance description

11. Booster heater element information label

:

CAUTION

for use only in water

ATTENTION

pour l'utilisation dans l'eau

ATENCIÓN

se usa sólo para en agua

:

:

315683-38055

12. Appliance must be vertical for at least one hour before com­missioning 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-fl ow of cold DHW.

To protect against corrosion, the inside of the DHW tank is coated
with special enamel and is additionally equipped with an im­pressed current anode.

The electronic control unit makes energy saving adjustments eas­ier. 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 fi lter dryer. There, the
refrigerant indirectly transfers heat to the DHW tank and the liquid
refri gerant is route d to a t wo- fl ood 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 elec­tronic 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.

10 | Accelera® 220-300 E www.stiebel-eltron-usa.com

OPERATION

comfor

omf

or

t

e

ron

Settings

3.1 Heating the DHW tank

The water is heated by the heat pump through the condenser
wrapped around the tank. This is the appliance’s standard mode
of operation.

An integral sensor in the tank is connec ted to an electronic device
to measure the thermal energy content of the water in the DHW
tank. The water in the DHW tank is heated if its temperature is
lower than the set temperature.

For information on the heat-up time of the water in the DHW tank,
See 15.3, “Data table”, pg. 29.

3.1.1 Electric booster element

The electric booster element is automatically activated in case
of a damaged heat pump or to provide more hot water than the
current tank supply.

In the event of an unexpectedly high hot water demand, the boost­er heater can be manually activated. Se e 4.4.1, “Comfo rt heating”,
pg. 13.

In the event of an appliance fault, a backup mode can be set to
activate the electric booster element. See 4.4.2, “Emergency back
up mode”, pg. 13.

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 fi ns, 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 defrost­ing.

3.2.2 Ambient temperatures above the application limit

The safety equipment switches the appliance off if the upper ap­plication 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 tem­perature 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 de­tected by the integral sensor is more than 65°F/18°C.

4. Settings

4.1 Display and controls

Note

The back-light of the display will illuminate for 15 seconds
after pressing any button.

12

elctronic comfort

11

10

9

8

7
6

1 Set temperature symbol
2 Amount of amount of mixed water display (l

1

04°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 dis­played when these appliance components are active. The display
of these symbols does not necessarily mean that the electric boost­er element and the heat pump are running.

Service/fault symbol

Note

Notify your contractor if the service/fault symbol ap­pears on the display. Continuous illumination of the
symbol indicates that the fault is not preventing appli­ance operation.
A fl ashing service/fault symbol indicates that the water
is not being heated and that it is essential you notify
your contractor.

lct

@

40°C /gal

4.2 Settings

In standard display mode, the display shows the current amount
of mixed water.

1

2

3

4

5

@

ENGLISH

26_03_13_0006_

www.stiebel-eltron-usa.com Accelera® 220-300 E | 11

OPERATION

Settings

Note

15seconds after every adjustment, the appliance auto­matically 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 tem­perature 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 ap­pliance 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.

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 re­mains 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 de­noted 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. 20). 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.

12 | Accelera® 220-300 E www.stiebel-eltron-usa.com

OPERATION

Settings

If the relevant set DHW temperature is accomplished, the com­pressor 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

1

0

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 t [min]

B

1

0 2

0 5 1015202530354045505560657075t [min]

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.

1

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. 15 .

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 ap­pliance'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).

The heat pump remains on and the comfort heating function re­mains active until a temperature of 149°F/65°C) has been achieved
in the entire DHW tank (comfort heating). The appliance then au­tomatically switches back to the previously set parameters.

Note

The electric booster element and heat pump symbols are
displayed until the comfort heating function has termi­nated.
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,
e ven though t he 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

D0000034613

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 fl ash.
The fault key fl ashes 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 to­gether (See 6.1, “Fault codes”, pg. 15). The fault key continues
to fl ash. 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 fi xed 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 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 fl ashing service key occurs again and
the back up function may be activated.

ENGLISH

www.stiebel-eltron-usa.com Accelera® 220-300 E | 13

OPERATION

Maintenance and care

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 qualifi ed 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 safe­ty, must only be carried out by a qualifi ed contractor.

Appliance
components

Casing Use a damp cloth to clean the casing sections. Never

Air intake grille / air
discharge grille

DHW tank The DHW tank is equipped with a maintenance-free

Electric booster ele­ment

Appliance Have the safety assembly and the evaporator checked

Condensate drain Undo the condensate drain. Check that the condensate

Care and maintenance t ips

use abrasive or corrosive cleaning agents.
Clean the air intake grille and air discharge grille

every six months. Cobwebs or other kinds of contami­nation can restrict the air supply to the appliance.

impressed current anode to safeguard against cor­rosion. The power supply must not be interrupted
while the appliance is filled with water to enable the
impressed current anode to provide protection. Oth­erwise there is a risk of corrosion.

Have the electric booster element descaled from time
to time. This will extend the expected life of the elec­tric booster element.

regularly by a qualified contractor.

drain is clear and remove any dirt from the conden­sate drain connection of the appliance.

Problem Cause Remedy

No hot water is
available.

The appliance is
not heating the
DHW tank although
the heat pump
symbol is illumi­nated.

The safety valve
of the cold water
supply line is drip­ping.

The condensate
drain drips.

The room tem­perature drops too
low.

Service symbol
is continuously
illuminated.

The air intake or air dis­charge of the appliance is
blocked.

The ambient temperature
exceeds the upper ap­plication limit (See 15.3,
“Data table”, pg. 29).
The appliance safety
equipment has responded
and the appliance has
switched off automati­cally.

The ambient temperature
falls below the lower ap­plication limit (See 15.3,
“Data table”, pg. 29).
The evaporator is current­ly being defrosted.

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.

These units are under
water mains pressure.
During the heat-up pro­cess, expansion water will
drip from the safety valve.

The surface temperature
of the evaporator is lower
than the dew point tem­perature of the ambient
air. Condensate forms.

See 6.1, “Fault codes”,
pg. 15

Check the air intake grille
and air discharge grille for
contamination. Remove any
contamination (See 14, “Main­tenance and cleaning”, pg.

23).
Wait for the appliance to cool

down. Call a qualified con­tractor if the appliance does
not switch back on automat­ically.

Wait until the appliance
switches back on automati­cally.

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 amount of condensate
depends on the air humidity
level.

Due to the heat pump pro­cess 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 in­stallation room is more than
7°F (4 °C) check the size of the
installation room.

Notify a qualified contractor.

6. Troubleshooting

Problem Cause Remedy

No hot water is
available.

14 | Accelera® 220-300 E www.stiebel-eltron-usa.com

No power to the appli­ance.

The circuit breaker in the
electric panel has tripped.

Check that the appliance
is connected to the power
supply.

Check whether the circuit
breaker in the electrical panel
has tripped. If required, dis­connect 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.

Service symbol
flashes and the
water does not
heat up.

See 6.1, “Fault codes”,
pg. 15

It is imperative that you notify
a qualified contractor.

OPERATION

Troubleshoot ing

6.1 Fault codes

If the service/fault symbol is fl ashing 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 tem­perature2.

Fault code appears

Fault

Service

code

symbol

0 No fault
2 continu-

ously illu­minated

4 continu-

ously illu­minated

6 flashing Dome sensor and integral sen-

8 flashing The appliance has recognized

continu-

16

ously illu­minated

32 flashing

The anode current is inter-

128 continu-

ously illu­minated

256 flashing Manually activated Emergency

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).

Fault description Remedy

The dome sensor has failed.
The temperature displayed is
measured by the integral sen­sor. The appliance will continue
to work properly.

The integral sensor has failed.
The mixed water display will
not show the correct amount
but the appliance will continue
to work properly.

sor failed. The appliance stops
heat delivery.

that the DHW tank is not heated
for 13 hours, despite there
being a demand.

Short circuit impressed current
anode / protective anode failed

The appliance is operating with
an empty tank or the appliance
is not delivering heat.

rupted. The appliance does not
heat up.

No communication between
controller and display. The
most recently selected set val­ues are active.

backup mode (only electric
booster element active).

Call Stiebel Eltron for
more information if
this error occurs.

Call Stiebel Eltron for
more information if
this error occurs.

Contact a qualified
contractor.

You can continue to use
the appliance by acti­vating backup mode.
See 4.4.2, “Emergency
back up mode”, pg.
13

Immediately inform a
qualified contractor,
as the appliance is not
protected against cor­rosion if the impressed
current anode is faulty.

Fill the appliance with
water. The fault code
disappears and the
appliance starts.

The contractor needs to
check the connection of
the impressed current
anode and the internal
wiring.

See 4.4.2, “Emergency
back up mode”, pg.

13.

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 displ ayed Indiv idual 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 displ ayed in
emergency backup mode

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

Indiv idual fault code(s)

Notifying a qualifi ed contractor

If you cannot remedy the fault, notify your qualifi ed 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

1

000000-0000-00000

1 Serial number on the type plate

ENGLISH

D0000035352

www.stiebel-eltron-usa.com Accelera® 220-300 E | 15

INSTALLATION

Safety

INSTALLATION

7. Safety

Only a qualifi ed contractor should carry out the installation, com­missioning, 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 "Specifi cation".

7.3 Incorrect use

The following are not permitted:

- Do not install the water heater on non-load bearing fl oors

- 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 fi ll with any other Freon, use only R134a

7.4 Qualifi cation

In this manual, qualifi ed individuals will be described as the “li­censed 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 fi eld. Licensed
installers work on systems on the basis of their training, knowl­edge 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 require­ments with regard to electrical-related installations.

7.4.3 Plumber (licensed)

A plumber is a licensed installer who meets the above require­ments with regard to water-related installations.

7.4.4 Customer service

For customer service inquiries, please contact Stiebel Eltron di­rectly 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 safe­ty assemblies protect the appliance against unacceptable excess
pressure.

- Pressure reducing valve (70 psi) if the water mains pressure
exceeds this

-Expansion tank

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 trans­porting. This enables horizontal transport and protects the appli­ance during transport.

Remove the packaging shortly before the installation and do not
unpack the appliance until it has arrived in the fi nal installation
room.

16 | Accelera® 220-300 E www.stiebel-eltron-usa.com

INSTALLATION

Preparations

Vehicular transport

Material losses

!

Storing and transporting the appliance vertically is rec­ommended.

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.

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.

- 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 fl oor of the installation room must be level and have suf­fi cient load bearing capacity. Take note of the weight of the
appliance with a full DHW tank (See 15.3, “Data table”, pg.

29). A fl oor with insuffi cient foundation pressure capacity
is in danger of collapse. If the appliance is not evenly bal­anced, 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 clear­ances”, pg. 18 and See 15.3, “Data table”, pg. 29).

- Observe the safety clearances and protection zones.

- Always leave suffi cient distance to provide access for instal­lation, maintenance and cleaning. Observe the required min­imum clearances (See 9.4, “Siting the appliance”, pg. 18).

- Ensure that the operation of other equipment in the installa­tion 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)

D0000034797

- 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 effi ciency of the appliance decreases.

ENGLISH

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 fl ammable, highly
combustible gases and substances, as well as high levels of
dust.

www.stiebel-eltron-usa.com Accelera® 220-300 E | 17

Note

It is possible to improve the effi ciency of the appliance by
utilizing the waste heat and humidity from other appli­ances 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".

INSTALLATION

Preparations

9.4 Siting the appliance

 Carefully undo the cardboard packaging at the clips.

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 fl oor plate of the appliance.

9.5 Minimum clearances

Minimum room volume:

2

800 ft

, 10´ x 10´ x 8´

(22.7 m2, 3 m x 3 m x 2.4 m)

Air flow
exhaust

6´ (1.8 m)

An object
next to the
unit must

≤42˝

D0000034797

(1.1 m)

Acceptable positioning, vent parallel to a wall:

be less than
42˝ high

6´ (1.8 m)

Air flow
exhaust

14˝

(0.4 m)

Air flow

intake

2´ (0.6 m)

8˝ (0.2 m)

2´ (0.6 m)

Air flow

intake

1

1.

1 Metal bracket fi xing bolt

 Remove the fi xing 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 fi nal location.

2.

Acceptable positioning, vent parallel to a wall in a corner:

8˝ (0.2 m)

Air flow

intake

8˝

(0.2 m)

6´

D0000034798

(1.8 m)

 Maintain the minimum clearances.

!

Air flow

exhaust

Material losses

The top of the appliance should be made horizontal.

 Level the appliance horizontally using the height-ad-

justable feet.

(0.6 m)

2´

(0.6 m)

2´

18 | Accelera® 220-300 E www.stiebel-eltron-usa.com

D0000034806

INSTALLATION

Installation

10. Installation

WARNING Injury

!

Incorrect installation can lead to serious personal injury
or material losses.
Before any work, ensure suffi cient 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 fl ush 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.

maximum pressure in the cold water supply line is higher, install
a pressure reducing valve.

Check valve

Install a check valve in the cold water line (after the pressure re­ducing valve if installed). This check valve is necessary to prevent
water from fl owing backwards into the cold water piping.

Drain valve

 Install a suitable drain valve at the lowest point in the cold

water inlet line.

DHW circulation

The heat losses incurred in a DHW circulation line and the elec­trical power consumption of the circulation pump reduce the effi ­ciency of the system. The cooled water in a circulation line mixes
with the tank content. Where possible, avoid installing a DHW
circulation line. Where that is not possible, the DHW circulation
pump must be controlled thermally or by time switch.

Thermal insulation

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.

ENGLISH

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 ex­cess 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.

Pressure reducing valve

The maximum pressure in the cold water supply line must be at
least 20% below the response pressure the safety valve. If the

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 insuffi cient base

slope. Observe the building characteristics.

www.stiebel-eltron-usa.com Accelera® 220-300 E | 19

INSTALLATION

Installation

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
termi nal with at least
disconnect switches or circuit breakers can be used for
this.

WARNING Electrocution

 Observe the safety regulations to prevent contact

with dangerous 'live' parts.

WARNING Electrocution
Coming into contact with 'live' components presents a
threat to life. Disconnect the appliance from the power
supply before carrying out work on the control panel.
Prevent the power supply from being switched on while
you are working on the system.

WARNING Electrocution
Insuffi cient grounding can lead to electrocution. Ensure
the appliance is grounded according to locally applicable
requirements.

WARNING Electrocution
The power cable must only be replaced (for example if
damaged) with an o riginal spare par t by a qualifi ed con­tractor authorized by the manufacturer. For an original
spare part contact Stiebel Eltron 800-582-8423 for part
number 315650.

Material losses

!

The voltage to the appliance must match the voltage spec­ifi ed on the type plate .

Material losses

!

Never connect the appliance to the power supply before
the DHW tank is fi lled.

Standard connection without external signal transmitter

˝

1

/4 mm contact gap. Contactors,

/8

10.3.1 Connection with external signal transmitter

An external potential free signal transmitter for controlling DHW
temperature (set temperature2) can be connected to terminal
X0/LF.

In the delivered status, terminal X0/LF is not assigned. If this
terminal is connected to 240V AC, the appliance activates set
temperature2.

Following a one-off activation (the external signal is present for at
least one minute), set temperature2 applies for at least 20min­utes.

Material losses

!

If the 240V AC signal of an external signal transmitter
is to be connected to terminal X0/LF, do not interchange
phase and neutral.

Note

 Never wire up terminal X0/FB.

Example 1: Power-OFF signal with own 240V AC phase

X0

PE

N

L1

L1, L2 oder L3

EVU:

Example 2: Photo-voltaic signal via on-site relay and phase
routed outside the appliance

PE

N

L1

PE
PE
N
N
L1
L1
LF
FB

X0

PE
PE
N
N
L1
L1
LF
FB

D0000034589

X0

PE
PE
N
N
L1
L1
LF

FB

20 | Accelera® 220-300 E www.stiebel-eltron-usa.com

1 Inverter (fl oating contact)
The inverter power feed is located at a central distribution point

(e.g. in the main fuse box).

D0000034487

1

D0000034590

INSTALLATION

Commissioning

Connection to terminal block X0

 Remove the appliance cover (See 14.1, “Removing the appli-

ance cover”, pg. 23).

1

1 Terminal X0

 Prepare the leads for connection to X0 in such a manner that

each lead terminating at X0 has a wire ferrule.

 Route leads through the strain relief.
 Connect the leads to X0 (see chapter "See 10.3.1, “Connection

with external signal transmitter”, pg. 20).

10.4 Assembling the appliance

Note

Refi t the appliance cover after completing your work.
See chapter "See 14.10, “Fitting the appliance cover”,
pg. 25).

11. Commissioning

11.1 Commissioning

Material losses

!

Never connect the appliance to the power supply before
the DHW tank is fi lled.

Note

At temperatures below 5°F/-15°C, the high limit safety
cut-out may respond. The appliance may be subjected to
these temperatures during storage or transport.

 If required, press the high limit safety cut-out reset

button. See 13.3, “Resetting the high limit safety
cut-out”, pg. 22

Note

After an interruption of the power supply, compressor op­eration remains blocked for at least one minute to allow
the electronic main board to initialize.
If the compressor subsequently fails to start, it may be
disrupted by additional safety devices (Klixon and high
pressure switch). This interruption due to the compressor
motor klixon is terminated automatically.
If the high pressure switch responds, it can be manually
reset after the pressure is less than 246 PSI. This normally
occurs 5 minutes after responding.

11.1.1 Filling the DHW tank

Fill the DHW tank and vent the pipework by following the proce­dure below:

 Close the drain valve.
 Open all DHW tap points and the shut-off valve in the cold

D0000034803

water supply.

 Close the DHW tap points as soon as water starts to emerge

from them.

11.1.2 Settings / function check

 To check the function, select the maximum set temperature.

A higher set temperature allows for more mixed water but lower
effi ciency. A lower set temperature is more effi cient but less
mixed water is available. Never reduce the set temperature below
1 22°F/50°C to reduce problems with legionella.

11.1.3 Appliance handover

 Explain the appliance function to users and familiarize them

with its operation.

 Make users aware of potential dangers, especially the risk of

scalding.

 Make users aware of critical environmental factors and re-

quirements concerning the installation location.

 Inform users that water may drip from the safety valve

during the heating operation.

 Hand over these operating and installation instructions to

users for safe-keeping.

11.2 Recommissioning

If the appliance is switched off due to an interruption to the power
supply, no specifi c measures for restarting are required once the
power supply has been restored. The appliance has saved the
parameters most recently set and continues operating with these.

If the comfort heating function was active before interruption of
the power supply, this is reactivated with a set temperature of
149°F/65°C once the power supply has been established again.

Remote function is not reactivated after an interruption of the
power supply.

ENGLISH

www.stiebel-eltron-usa.com Accelera® 220-300 E | 21

INSTALLATION

Shutting down

12. Shutting down

Material losses

!

If the appliance is disconnected from the power supply,
it is no longer protected against frost.

 Only disconnect the appliance from the power sup-

ply for longer periods if you are also draining the
DHW tank.

If there is no usage of hot water for a long period of time, always
drain the DHW tank. See chapter "See 14.4, “Draining the tank”,
pg. 24".

The appliance can only be switched off by interrupting the power
supply.

 Pull the plug from the socket or disconnect the circuit breaker

to the appliance.

13. Troubleshooting

WARNING Risk of electrocution
Prior to all work on the appliance, turn off all power to it.

 For work inside the appliance, remove the appliance cover

(See 14.1, “Removing the appliance cover”, pg. 23).

 If necessary, remove the upper section of the casing jacket

(See 14.2, “Removing the casing ring”, pg. 23).

Note

Refi t the casing ring after completing the work. See 14.9,
“Fitting the casing ring”, pg. 24.

Note

Refi t the appliance cover after completing your work. See

14.10, “Fitting the appliance cover”, pg. 25.

13.1 Fault table

Fault Cause Remedy

The appliance
switches off
unexpectedly
and does not
switch on
again.

The compres­sor switches off
unexpectedly.

Excessive pressure in
the refrigerant circuit.
The safety pressure lim­iter has responded. The
compressor has been
switched off.

The appliance is operated
outside the operation
limit. The ambient tem­perature is higher than
the permissible value.
The safety pressure limit­er has responded.

The thermal load of the
compressor has been ex­ceeded. The motor over­load relay has responded.

Eliminate the cause of the in­crease in pressure in the refriger­ant circuit.
Wait approx.5 to 15minutes for
the appliance to equalize the
pressure. Reset the safety pres­sure limiter (See 13.2, “Resetting
the safety pressure limiter”, pg.

22).
Ensure that the operation limit is

observed.
Wait approx.5 to 15minutes for
the appliance to equalize the
pressure. Reset the safety pres­sure limiter (See 13.2, “Resetting
the safety pressure limiter”, pg.

22).
Remedy the cause of the high

thermal load. Wait until the appli­ance restarts.

Fault Cause Remedy

The appliance
generates less
heat.

An inadequate air flow
across the evaporator
may be a possible cause.

Check whether the fan is contam­inated. Check whether the evapo­rator is contaminated. Ensure that
supply and extract air flow are
unimpeded.

For explanations of the fault codes, See 6.1, “Fault codes”, pg.

15.

13.2 Resetting the safety pressure limiter

The safety pressure limiter shuts down the compressor if the
pressure inside the refrigerant circuit exceeds the permissible
maximum value. The safety pressure limiter may also respond if
the appliance is operated above its permissible application limit
or the temperature controller of the heat pump fails to respond.

1

2

1 Reset button for safety pressure limiter
2 Reset button for high limit safety cut-out

 After removing the cause of the fault, reset the safety pres-

sure limiter by pressing the reset button.

13.3 Resetting the high limit safety cut-out

The high limit safety cut-out protects the appliance from over­heating. The electric booster element switches off when the tank
water temperature exceeds 188±10 °F / 87±5 °C.

Once the cause of the fault has been removed, press the reset
button of the high limit safety cut-out on the rod thermostat. To
do so, remove the appliance cover.

13.4 Motor overload relay

In the event of excessive thermal load of the compressor, the motor

overload relay switches the compressor off.

 Remove the cause.

After a short cooling period, the motor overload relay will restart
the compressor automatically.

D0000034801

22 | Accelera® 220-300 E www.stiebel-eltron-usa.com

INSTALLATION

Maintenance and cleaning

14. Maintenance and cleaning

WARNING Electrocution
Prior to all work on the appliance, turn off all power to it.

14.1 Removing the appliance cover

ENGLISH

 Undo the screw (Torx) that fastens the control panel and the

appliance cover to the appliance.

 Push the control panel upwards.

 Remove the control panel.
 A lead connects the operating controls to the appliance ECB.

If necessary, pull the plug from the back of the control panel
to fully remove the control panel.

 Carefully lift away the appliance lid and undo the ground

wire that runs from the appliance control panel to the cover.

Note

Refi t the appliance cover after completing your work. See

14.10, “Fitting the appliance cover”, pg. 25.

1

1 Fixing screws on casing ring
The casing ring is fastened with screws.

 Undo the fi xing screws on the casing.
 Remove the condensate drain bend and pipe collar of the

D0000035322

drain. Turn anti-clockwise to undo.

Material losses

!

A ground wire is connected to the inside of the casing
ring. The casing can only be removed after the ground
wire has been detached.

D0000034802

The casing ring overlaps along the joint. A tab on one end clips
into the recess on the other end of the casing ring.

 Ease the casing ring apart, until it can be removed or slid

downwards.

Note

Refi t the casing ring after completing the work. See 14.9,
“Fitting the casing ring”, pg. 24

D0000034803

D0000034814

14.2 Removing the casing ring

Note

If you require more space to work inside the appliance,
you can remove the casing on the upper section of the
appliance.

www.stiebel-eltron-usa.com Accelera® 220-300 E | 23

INSTALLATION

Maintenance and cleaning

14.3 Cleaning the evaporator

WARNING Injury

!

The evaporator consists of numerous sharp-edged fi ns.
Be careful during cleaning the evaporator and wear pro­tective clothing, especially safety gloves.

The evaporator fi ns are coated with a hydrophilic coating to reduce
corrosion and to eliminate surface tension on condensed water
droplets. This creates a self-cleaning action so minimal cleaning
is necessary. Nevertheless, the evaporator should still be checked
for contamination and corrosion and cleaned as necessary.

Undo the screw that secures the appliance cover at the upper side
of the control panel.

 Remove the control panel and the appliance cover.
 Carefully clean the evaporator fi ns. Use water and a soft

brush for this. Never use acidic or alkaline cleaning agents.

14.4 Draining the tank

1

D0000034799

1 Electric booster element with protective anode

WARNING Burns
Hot water may escape when draining the DHW tank.

To drain the DHW tank, e.g. when shutting the appliance down,
proceed as follows:

 Unplug the appliance from the power supply.
 Close the shut-off valve in the cold water supply line.

The DHW tank is drained via the cold water supply line.

 Open the drain valve installed in the cold water supply line

(See 10.1, “Water connection”, pg. 19). If no drain valve
has been installed, undo the cold water supply line at the
“cold water inlet” connection.

 Open one tap in one sink.

Some residual water will remain in the lower section of the DHW
tank.

14.5 Descaling the electric booster element

Only descale the fl ange of the electric booster element after re­moving it, and never treat the interior of the DHW tank and the im­pressed current anode with descaling agents. The electric booster
element is screwed into the appliance at a central point at the top.

14.6 Protective anode

The fl ange of the electric booster element is equipped with a
protective anode that protects the appliance from corrosion while
it is connected to the power supply. The protective anode is a
maintenance-free impressed current anode.

If a fault code in the display indicates that the protective anode is
faulty, proceed as follows:

 Remove the controller of the electric booster element.
 Check the protective anode connector and its wiring.
 Refi t the controller of the electric booster element.

14.7 Valves

Regularly check the system's valves (safety valve, pressure reduc­ing valve, drain valve, vacuum breaker, mixing valve), to ensure the
operational reliability of the appliance. The amount of lime-scale
deposits depends on local water quality.

 Check all valves in the system and remove lime-scale

deposits.

 Replace the valves if necessary.
 Check the function of the valves.

14.8 Replacing the power cable

WARNING Electrocution
If the power cable is faulty, replace it with a new one.
The power cable should only be replaced by a qualifi ed
contractor.

14.9 Fitting the casing ring

WARNING Electrocution

 Reconnect the ground wire to the casing ring.

24 | Accelera® 220-300 E www.stiebel-eltron-usa.com

INSTALLATION

Maintenance and cleaning

 Fit the upper casing ring. The casing ring overlaps along the

joint. A tab on one end clips into the recess on the other end
of the casing ring.

 Secure the casing ring with screws.
 Fit the pipe collar of the condensate drain and the conden-

sate drain bend.

14.10 Fitting the appliance cover

ENGLISH

D0000034814

WARNING Electrocution

 Reconnect the ground wire to the appliance cover.

 Place the lid back on the appliance top.
 Connect the ground cable to the signed ground terminal.
 Connect the cable linking the control with the appliance ECB

to the back of the panel.

 Insert the control panel.
 Secure the appliance cover and the control panel using the

screw at the top of the control panel.

www.stiebel-eltron-usa.com Accelera® 220-300 E | 25

INSTALLATION

Specifi cation

15. Specifi cation

15.1 Dimensions and connections

15.1.1 Accelera 220 E

1

˝

/

27

8

(690 mm)

F

E

D

3

˝

/

60

4

(1545 mm)

5

˝

/

45

8

(1160 mm)

(884 mm)

1

˝

/

– 1

2

(8–24 mm)

Accelera 220 electronic

A Entry electrical cables
B Cold water inlet Male thread 1˝ NPT
C DHW outlet Male thread 1˝ NPT
D Condensate drain Male thread ¾˝ NPT
E Air intake
F Air discharge

A

C

3

˝

/

34

4

B

1

˝

/

9

2

(241 mm)

26 | Accelera® 220-300 E www.stiebel-eltron-usa.com

INSTALLATION

Specifi cation

15.1.2 Accelera 300 E

1

/

27

8

(690 mm)

˝

ENGLISH

F

E

D

3

˝

/

75

8

(1913 mm)

1

˝

/

60

8

(1528 mm)

1

˝

/

– 1

2

(8–24 mm)

Accelera 300 electronic

A Entry electrical cables
B Cold water inlet Male thread 1˝ NPT
C DHW outlet Male thread 1˝ NPT
D Condensate drain Male thread ¾˝ NPT
E Air intake
F Air discharge

C

49

(1252 mm)

1

/

4

A

˝

(241 mm)

B

1

˝

/

9

2

www.stiebel-eltron-usa.com Accelera® 220-300 E | 27

INSTALLATION

Specifi cation

15.2 Wiring diagram

M2

E1

R1

1

2

N1

F1

AB

sw

sw

A1

X2

5

X2

X1

31

A2 B1 G1

X12

X10

X7

21

EZB

V1

sw

X4 X5

K2

M
1~

L

N

V2

rt

K3

X6

X9

M1

M
1~

C

R

S

3

F2

1

brswblbr bl

FB

L1

CB

L3
N
L2
LF

F3

p

N2

4

gnge

EVU

sw 1

sw 2

2

3

PE
N
L
L

LF

315674-38055

Z1

X1

5

4
3
2

1

Tank
Cap
Outer jacket

X0

N

L
LF
FB

A1 Electronic assembly (control unit)
A2 Electronic assembly (programming unit)
B1 Temperature sensor
E1 Heating element (1.5kW / 5120 BTU/h)
F1 High limit safety cut-out TSR (87°C ±5 / 189°F ±8)
F2 Motor protection switch M1
F3 High pressure switch (24 bar)
G1 Impressed current anode
L

LF

Optionally see Installation instructions
M1 Compressor
M2 Fan
N1 Thermostat TSR (65°C ±5 / 149°F ±8)
N2 Defrost controller
R1 Resistor (380 ohms)
X0 Mains terminal
X1 Terminals
Z1 Capacitor

Material losses

!

If X0/LF is connected, the power supply to the appliance
must be a permanent connection (See 10.3.1, “Connec­tion with external signal transmitter”, pg. 20). Never
interchange L1 and N.

Note

 Never wire up terminal X0/FB.

28 | Accelera® 220-300 E www.stiebel-eltron-usa.com