STIEBEL ELTRON Accelera 300 Specification sheet

OPERATING AND INSTALLATION MANUAL

DHW HEAT PUMP WATER HEATER

» ACCELERA© 300

A 280011-35603-85xx

B 289230-35603-85xx

STIEBEL ELTRON Inc.

17 West Street | West Hatﬁeld MA 01088

Tel. 413-247-3380 | Fax 413-247-3369

Email info@stiebel-eltron-usa.com

www.stiebel-eltron-usa.com

2 | ACCELERA 300 WWW.STIEBEL-ELTRON-USA.COM

GENERAL INFORMATION

Please read

Read these instructions carefully and retain

them for future reference. If the water heater

is passed on to a third party please hand these

instructions to the new user.

This manual includes important information regarding

the safe and efﬁcient handling of the water heater.

The manual is part of the water heater and should be

retained in the immediate vicinity and should always

be accessible.

The steps described must only be carried out by a

licensed installer. The respective licensed installer must

read these instructions prior to commencing any work. It

is imperative for safe working that all safety instructions

and actions described are complied with. In addition,

all local and national accident prevention and general

safety instructions apply.

Should safety instructions be ignored, the water heater

may not operate correctly or material losses may occur.

Serious injury or death may result. Never remove the

water heater casing without ﬁrst isolating the water

heater from its 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 illustrations.

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 the water heater by unqualiﬁed

personnel

- Unauthorized modiﬁcations

- Technical modiﬁcations

- Use of unauthorized spare parts

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.

Contraventions 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. 413-247-3380 | Fax 413-247-3369

Email info@stiebel-eltron-usa.com

www.stiebel-eltron-usa.com

Should you have any question regarding the installation

or operation of the water heater, please contact our

customer service. Tel. (USA) 800-582-8423 or 413-247-

3380

ENGLISH

WWW.STIEBEL-ELTRON-USA.COM ACCELERA 300 | 3

CONTENTS | OPERATION

GENERAL INFORMATION _______________________________ 2

OPERATION _____________________________________________ 4

1. Overview_________________________________________ 4

2. General information _____________________________ 4

2.1. Key to symbols___________________________________ 4

3. Safety_____________________________________________ 8

3.1. General safety instructions ____________________ 8

3.2. Intended use _____________________________________ 8

3.3. Incorrect use _____________________________________ 8

3.4. Personnel qualiﬁcation_________________________ 8

3.5. Safety equipment _______________________________ 8

3.6. Particular risks___________________________________ 9

4. Water heater description _______________________ 9

4.1. Function description____________________________ 9

5. Operation for installers and homeowners____ 10

5.1. Start-up by a licensed installer ______________ 10

5.2. Starting and stopping _________________________ 10

5.3. Emergency stop ________________________________ 10

6. Maintenance and care__________________________ 10

6.1. Descaling ________________________________________ 11

7. What to do if ... _________________________________ 11

7.1. ... the water heater does not deliver hot

water _____________________________________________ 11

7.2. ... the safety valve of the cold water supply

line is dripping__________________________________ 11

7.3. ... the condensate drain drips________________ 11

7.4. ... the power consumption is too high _____ 11

7.5. ... the room temperature drops excessively

____________________________________________________ 11

7.6. ... other faults occur ___________________________ 11

8. Safety____________________________________________ 12

8.1. General safety instructions ___________________ 12

8.2. Incorrect use ____________________________________ 12

8.3. Qualiﬁcation_____________________________________ 13

8.4. Instructions, standards and regulations ___ 13

8.5. Water installation ______________________________ 13

8.6. Electrical installation __________________________ 13

9. Water heater description ______________________ 14

9.1. Standard delivery ______________________________ 14

9.2. Special accessories_____________________________ 14

10. Installation ______________________________________ 15

10.1. Installation location____________________________ 15

10.2. Shipping inspection____________________________ 15

10.3. Handling _________________________________________ 16

10.4. Storage ___________________________________________ 16

10.5. Positioning the water heater _________________ 16

10.6. Unpacking the water heater__________________ 17

10.7. Water connection_______________________________ 19

10.8. Power supply ___________________________________ 20

11. Start-up _________________________________________ 22

11.1. Start-up __________________________________________ 22

11.2. Shutting down __________________________________ 22

11.3. Start-up after shut down _____________________ 22

12. Settings _________________________________________ 23

12.1. Adjusting the water temperature ___________ 23

13. Before the licensed installer leaves___________ 23

14. Troubleshooting ________________________________ 23

14.1. Safety equipment of the water heater______ 23

14.2. Troubleshooting ________________________________ 24

15. Maintenance and cleaning _____________________ 24

15.1. Cleaning the evaporator ______________________ 24

15.2. Draining the tank_______________________________ 24

15.3. Sacriﬁcial anode________________________________ 25

15.4. Descaling ________________________________________ 25

15.5. Checking valves_________________________________ 25

16. Speciﬁcation ____________________________________ 26

16.1. Connection and other dimensions __________ 26

16.2. Wiring diagram_________________________________ 27

16.3. Refrigerant diagram ___________________________ 28

16.4. Data table________________________________________ 29

WARRANTY ____________________________________________ 31

ENVIRONMENT AND RECYCLING______________________ 31

OPERATION

OVERVIEW

4 | ACCELERA 300 WWW.STIEBEL-ELTRON-USA.COM

1. Overview

Front of the water heater

26_03_01_0880

1 Water heater cover

2 Opening for PT valve

3 Condensate drain

4 Leveling feet

5 Cold water inlet

6 Hot water outlet

7 Air entry

The water heater extracts heat from the ambient air and

utilizes this energy to heat hot water.

An 80 gallon water tank is part of the water heater. Foam

insulation is applied to the outside of the water tank to

prevent heat losses. The water heater casing is made

from powder-coated sheet steel.

The internally enameled water tank is supported by

three height-adjustable anti-vibration leveling feet.

OPERATION

Back of the water heater

26_03_01_0880

8 Air discharge

9 Cable entry for the power cable

2. General information

The chapter Operation is intended for users and licensed

installers.

The chapter Installation is intended for licensed

installers only.

2.1 Key to symbols

2.1.1 Layout of safety information

DANGER Electric shock

Before any work on the water

heater, disconnect all poles from

the power supply.

1 Symbol (see chapter "Symbols")

2 Keyword (see chapter "Keywords")

3 Designations (see chapter "Symbols")

4 Information text

OPERATION

GENERAL INFORMATION

ENGLISH

WWW.STIEBEL-ELTRON-USA.COM ACCELERA 300 | 5

2.1.2 Symbols

Symbol Description

Injury

Electrocution

Burns or scalding

!Other situations

Fire

Explosion

Water heater disposal

2.1.3 Keywords

KEYWORD

DANGER

The keyword DANGER indicates

information that must be observed,

otherwise serious injury or death

will result.

WARNING

The keyword WARNING indicates

information that must be observed,

otherwise serious injury or death

may result.

CAUTION

The keyword CAUTION indicates

information that must be observed,

otherwise relatively serious or light

injuries may result.

2.1.4 Symbols in this documentation

Read the text next to this symbol carefully.

»Passages with the symbol "»" indicate that you have

to do something. The action you need to take is

described step by step.

- Passages with this symbol "–" indicate lists.

2.1.5 Units of measure in this documentation

The dimensions in this document are given in

inch (millimeters).

2.1.6 Information on the packaging

Information label "Top heavy"

AO 085 / Created with Adobe Illustrator CS

Benennung:

Description:

Mat.Nr.:

Ident.No.:

Bearb.:

Editor:

Gepr.:

Checked:

Datum:

Date:

Änd.-Index:

Mod.-index:

Datum:

Date:

Datum:

Date:

Ersatz für:

Substitute:

V / ZV:

Manifold.:

Format:

Size:

Maßstab

Measuring rod:

Blatt:

Page:

Herausgabe Index:

Actual Index:

Materialart:

Type of material:

Klassifizierung:

Classification:

Für diese Zeichnung behalten wir uns alle Rechte vor. Schutzvermerk nach

DIN ISO 16016 beachten. Änderungen von Seiten des Lieferanten bedürfen

der vorherigen Genehmigung durch STIEBEL ELTRON

For this drawing we reserve ourselves all rights to protection note

DIN ISO 16016 pay attention. Change from the supplier need the previous

approval by STIEBEL ELTRON.

Herstellnummer:

Date of manufacturing:

Lfd. Nummerierung / Start:

Upcounting number / Start:

Material:

Norm gepr.:

Norm check:

Roh

1 / 1

1 : 1

EWN 801

000001

165123

264623

Afkl Hinw Transport

Haibach

Hoersting

28.06.04

K_______.__.__

20 / 15

K33631

23700000

Transportation Information Sticker

! !

Hoher Schwerpunkt

High balance point

Hoog zwaartepunt

Centre de gravité en partie haute

Hög tyngdpunkt

Alto centro di graviá

Alto centro de gravedad

Achtung - Attention - Attentie - Attention

Uppmärksamhet - Oppmerksomhet

Attenzione - Atención

264623/K33631

264623-33631

Information label "Vertical transport"

! Achtung - Attention !

Transport und Aufstellung

Damit das Gerät vor Beschädigungen geschützt ist, sollte es bis an den Montageort in der Verpackung transportiert werden. Gerät senkrecht transportieren! Bei

beengten Transportbedingungen kann das Gerät auch kurzzeitig geneigt werden. Beachten Sie die weiteren Hinweise zum Aufstellen und Ausrichten des Gerä-

tes in der beiliegenden Gebrauchs- und Montageanweisung um Schäden am Gerät zu vermeiden.

Transport and installation

To protect the equipment against damage, it must be transported inside its dedicated packaging until the installation facility is arrived. Transport the equipment

upright. Where space is restricted, you may also move briefly the equipment tipped backwards at an angle.. Observe the notes on installation and fitting of the

equipment, which can be found in the enclosed installation and operating instructions, to avoid possible damage to the equipment.

280306-34594

Gerät nur senkrecht oder ggf. geneigt transportieren.

Move this machine only in a vertical position or, if required, slightly inclined with the control facia point up.

280306-34594

OPERATION

GENERAL INFORMATION

6 | ACCELERA 300 WWW.STIEBEL-ELTRON-USA.COM

1 Information label "Condensate drain"

This label shows you the position where the water

heater drain is located.

Drain

280302-3481284594

280302-34812.

2 Information label "Risk of scalding"

BURN

HOT

CAUTION

DANGER

284760-34684

284760-34684.

3 Information label "Connection"

For reason

corrosion

protection

use flat

gasket ring

280305-34625

2.1.7 Information on the water heater

BURN

HOT

CAUTION

DANGER

284760-34684

Forreason

corrosion

protection

useflat

gasketring

280305-34625

WW Austritt

DHW outlet

280304-34

6845

Warning

Atemperature and pressure relief valve

mustbe fitted to the clearly marked

socket.The valve drain outlet pipe

mustnot be sealed or blocked, and the

valveeasy gear is to be operated

atleast once every six month.

280558-34684

Relief valve

Plumber:

Therelief valve supplied in the

cartonmust be fitted to this

socket.

280557-34684

Forreason

corrosion

protection

use flat

gasketring

280305-34625

Drain

28030

2-3481284594

KW Eintritt

CW Inlet

280303-346845

26_03_01_1355

1 Information label "Condensate drain"

2 Information label "Risk of scalding"

3 Information label "Connection"

4 Information label "Hot water outlet"

5 Information label "Relief valve"

6 Information label "Relief valve installation location"

7 Information label "Cold water inlet"

Power supply

Disconnectpower supply

beforeopening the cover.

280556-3468425

Type:Accelera300/WHP300

Heatpump:

PN(Air42°/Water 60°):

IN(Air42°/Water 60°):

TypeofRefrigerant:

Refrigerantcharge:

Max.operatingpressure:

Lockrotorcurrent:

MCA:

Ratedloadcompressor:

Motorfan:

Order-No.:222423

DHW-cylinder:

Additionalheatingelement:

Max.operatingpressure:

Max.operatingtemperature:

Typeofcylindermaterial:

Cylindercapacity:

Testpressurestoragetank:

Observetheinstallationmanual! Tested for leaks!

MadeinGermany

No.: 8443 / 005204

Voltage/Frequency:

Breaker:

P (ratedpowerinput):

Maximumallowableratings

Protectionclass:

Nmax

Singlephase220-240V, 50/60 Hz

15amp.

2200W,9.17A

IP24

*222423844300520415*

1690W

87psi/600kPa

168.8°F/76°C

Glasslinedsteel

80.044Gal/303l

130.5psi/900 kPa

0.5kW

2.17A

R134A

1.9842Lb./900g

348.1psi/2.4MPa

13.4A

10.4A

2.3A

38W

STIEBELELTRONINC

17WestStreet

WestHatfield,MA01088

USA

282209-35237

DE:EnthältvomKyoto - Protokoll erfasste fluorierte Treibhausgase - hermetisch geschlossenes System .

GB:Containsfluorinatedgreenhouse gases covered by the Kyoto Protocol - her meticallysealed.

FR:Comprendlesgaz à effet de serrefluorés enregistrés par le proto cole de Kyoto - systèmes hermétiquement scellés.

NL:Bevatgefluoreerdebroeikasgassen die onder het Kyoto-protocol vallen - herme tischgeslotensysteem.

SE:InnehålleravKyoto - protokollet registrerade flourerande växthusgaser i hermetiskt förslutna sys tem.

PL:Zawierafluorowanegazy cieplarniane ujęte w Protokole z Kioto - hermetycznie zamkni ęty układ.

CZ:Obsahujefluorizovanéskleníkové plyny, obsažené v Kjótském protokolu - herm etickyuzavřenýsystém.

ES:Sistemaherméticamentecerrado que contiene gases de efecto invernader o mencionados en el protocolo de Kioto.

DK:IndeholderfraKyoto-protokollenregistrerede, fluorerede drivhusgasser – hermetisk lukket system .

NO:Inneholderfluorertedrivhusgassersom omfattes av Kyotopro tokollen-hermetisklukket system.

FI:SisältääKiotonsopimuksen alaisia fluorattuja kasvihuonekaasuja - ilmatiiviisti suljettu järjestelmä. 284436-34741

BG:СъдържапосоченитевПротоколаот Киото флуорирани парникови газове - херметически затворена система.

HU:AKiotóiJegyzıkönyv szerinti fluortartalmú üvegházhatású gázokat tartalmaz - hermetikusan zárt rendszer.

IT:Contienegasfluorurati ad effetto serra disciplinati dal protocollo di Kyoto- Impianto ermeticamente chius.

RO:Conțineunsistem închis ermetic contra emisiei de gaze fluorine monitorizat de protocolul Kyoto.

26_03_01_1356

8 Information label "Power connection"

9 Type plate

10 Information label "Fluorated gases"

11 Information label "Energy efﬁciency"

OPERATION

GENERAL INFORMATION

ENGLISH

WWW.STIEBEL-ELTRON-USA.COM ACCELERA 300 | 7

4 Information label "Hot water outlet"

WW Austritt

DHW outlet

280304-34

6845

280304-34684

5 Information label "Relief valve"

Warning

A temperature and pressure relief valve

must be fitted to the clearly marked

socket. The valve drain outlet pipe

must not be sealed or blocked, and the

valve easy gear is to be operated

at least once every six month.

280558-34684

Information label "Relief valve installation location"

Relief valve

Plumber:

The relief valve supplied in the

carton must be fitted to this

socket.

280557-34684

7 Information label "Cold water inlet"

KW Eintritt

CW Inlet

280303-34

6845

280303-34684

8 Information label "Power connection"

Power supply

Disconnect power supply

before opening the cover.

280556-34

68425

280556-34684

9 Type plate

Type: Accelera 300/WHP 300

Heat pump:

PN (Air 42°/ Water 60°):

IN (Air 42°/ Water 60°):

Type of Refrigerant:

Refrigerant charge:

Max. operating pressure:

Lock rotor current:

MCA:

Rated load compressor:

Motor fan:

Order-No.: 222423

DHW-cylinder:

Additional heating element:

Max. operating pressure:

Max. operating temperature:

Type of cylinder material:

Cylinder capacity:

Test pressure storage tank:

Observe the installation manual! Tested for leaks!

Made in Germany

No.: xxxx / xxxxxx

Voltage / Frequency:

Breaker:

P(rated power input):

Maximum allowable ratings

Protection class:

Nmax

Single phase 220-240 V, 50/60 Hz

15 amp.

2200 W, 9.17 A

IP 24

*222423xxxxxxxxxxxx*

1690 W

87 psi /600kPa

168.8 °F / 76 °C

Glass lined steel

80.044 Gal /303l

130.5 psi / 900 kPa

0.5 kW

2.17 A

R134A

1.9842 Lb. /900g

348.1 psi /2.4 MPa

13.4 A

10.4 A

2.3 A

38 W

STIEBEL ELTRON INC

17 West Street

West Hatfield, MA 01088

USA

282209-35237

26_03_01_1357

10 Information label "Fluorated gases"

DE: Enthält vom Kyoto - Protokoll erfasste fluorierte Treibhausgase - hermetisch geschlossenes System.

GB: Contains fluorinated greenhouse gases covered by the Kyoto Protocol - hermetically sealed.

FR: Comprend les gaz à effet de serrefluorés enregistrés par le protocole de Kyoto - systèmes hermétiquement scellés.

NL: Bevat gefluoreerde broeikasgassen die onder het Kyoto-protocol vallen - hermetisch gesloten systeem.

SE: Innehåller av Kyoto - protokollet registrerade flourerande växthusgaser i hermetiskt förslutna system.

PL: Zawiera fluorowane gazy cieplarniane ujęte w Protokole z Kioto - hermetycznie zamknięty układ.

CZ: Obsahuje fluorizované skleníkové plyny, obsažené v Kjótském protokolu - hermeticky uzavřený systém.

ES: Sistema herméticamente cerrado que contiene gases de efecto invernadero mencionados en el protocolo de Kioto.

DK: Indeholderfra Kyoto-protokollen registrerede, fluorerede drivhusgasser – hermetisk lukket system.

NO: Inneholderfluorerte drivhusgasser som omfattes av Kyotoprotokollen - hermetisk lukket system.

FI: Sisältää Kioton sopimuksen alaisia fluorattuja kasvihuonekaasuja - ilmatiiviisti suljettu järjestelmä. 284436-34741

BG: Съдържа посочените вПротокола от Киото флуорирани парникови газове - херметически затворена система.

HU: A Kiotói Jegyzıkönyv szerinti fluortartalmú üvegházhatású gázokat tartalmaz - hermetikusan zárt rendszer.

IT: Contiene gas fluorurati ad effetto serra disciplinati dal protocollo di Kyoto - Impianto ermeticamente chius.

RO: Conține un sistem închis ermetic contra emisiei de gaze fluorine monitorizat de protocolul Kyoto.

26_03_01_1386

11 Information label "Energy efﬁciency"

282980-34625

Maintain the legibility of all information labels.

Illegible safety information and symbols can

result in dangerous situations.

OPERATION

SAFETY

8 | ACCELERA 300 WWW.STIEBEL-ELTRON-USA.COM

3. Safety

This chapter provides an overview of all important

actions required for a safe and trouble-free operation.

3.1 General safety instructions

Operate the water heater only when fully installed and

with all safety equipment ﬁtted.

Unsuitable tools or incorrect handling of the water

heater can result in damage to the water heater and

to water or refrigerant leaking from the water heater.

DANGER Scalding

The water is heated inside the water tank to

140 °F(60 °C). There is a risk of scalding at

outlet temperatures above 109 °F (43 °C).

»Ensure that outﬂowing water does not

directly contact your body.

CAUTION Injury

Where children or persons with limited

physical, sensory or mental capabilities are

allowed to control this water heater, ensure

that this will only happen under supervision

or after appropriate instruction by a person

responsible for their safety.

»Children should be supervised to ensure

that they never play with the water heater.

Never place any objects on top of the water

heater.

Objects placed on top of the water heater

can increase the noise level developed by the

water heater through vibrations.

Never cover the water heater.

The water heater draws in air. Covering the

inlet slots reduces the air intake. This reduces

the efﬁciency of the water heater and can even

lead to one of the safety facilities interrupting

the water heater operation.

3.2 Intended use

This water heater produces hot water automatically.

The water heater can be installed and operated in the

open as well as in enclosed spaces. The temperature of

the air that is drawn in during operation must not fall

below 43 °F(6 °C).

Any other use beyond that described shall be deemed

inappropriate. Observation of these instructions is also

part of the correct use of this water heater.

Any changes or modiﬁcations to this water heater void

all warranty rights.

3.3 Incorrect use

The following are not permitted:

- Do not use heating media other than potable water

- Do not use uqualiﬁed (unlicesensed) personnel for

installation

- Do not use in an environment with greasy extract

air

This water heater must not be operated at

ambient temperatures in excess of 107 °F

(42°C) or below 43°F (6 °C).

If outside air is directly drawn in ensure, that

the water heater is isolated from its power

supply when the air temperature falls below

43 °F(6 °C).

3.4 Personnel qualiﬁcation

DANGER Injury

Incorrect handling can result in severe injuries

and material losses. Inadequately qualiﬁed

personnel cannot assess the impending

danger.

Have the installation, commissioning,

maintenance and repair steps carried out only

by the qualiﬁed individuals speciﬁed in the

respective chapters.

In the remainder of this manual, such qualified

individuals will be described as the "licensed installer."

3.5 Safety equipment

Wear safety shoes/boots during the transportation and

positioning of the water heater. Dry, this water heater

weighs 290 lb (130 kg.) Safety shoes/boots reduce the

risk of contusions.

OPERATION

WATER HEATER DESCRIPTION

ENGLISH

WWW.STIEBEL-ELTRON-USA.COM ACCELERA 300 | 9

3.6 Particular risks

3.6.1 Electric current

WARNING Electric shock

Contacting parts that carry live power is

associated with a direct risk to life. Damaging

the insulation or individual components can

result in a risk to life.

»If you detect damaged insulation,

immediately switch off the power supply

and arrange for the necessary repair.

»Have all electrical work carried out by a

qualiﬁed electrician.

3.6.2 Hot surfaces

CAUTION Burning

Contact with hot components can result in

burning.

»When working near hot components, wear

protective clothing and gloves.

»The pipework connected to the hot water

outlet of the water heater can reach

temperatures in excess of 140 °F (60°C).

3.6.3 Refrigerant

The water heater is ﬁlled with refrigerant at the factory.

WARNING Freezer burn

Should the water heater leak refrigerant,

avoid contact with the refrigerant or

breathing in any released vapors. Vent the

room concerned.

In normal water heater operation, the refrigerant is

contained in a sealed circuit, hence no risk arises from

the refrigerant.

4. Water heater description

This water heater is an automatic hot water generator

with approx. 80 gallon capacity. The hot water

temperature is factory set to 140 °F (60 °C).

After opening a hot water faucet, the hot water is pushed

out of the water heater by the incoming cold water.

The water heater operates with recirculating air and

consequently requires no outside air supply. The water

heater extracts heat from the ambient air. This heat

is used to heat the water contained inside the tank;

simultaneously electrical energy is used. The demand

for electrical energy and the heat-up time depend on

the temperature of the air drawn in.

When installing the water heater inside, the room where

it is installed will be cooled down during the operation

by 2 to 6 °F (1 to 3 °C).

The water heater also extracts moisture from the air

that creates condensate, which must be drained off. For

this purpose, a condensate drain with strainer plug is

integrated in the bottom of the water heater. This is

where you can connect a hose.

To protect the steel tank against corrosion, the interior

is coated with a special enamel and is furthermore

equipped with a sacriﬁcial anode.

Heat pump function:

A sealed circuit inside the water heater contains a CFC-

free refrigerant (see "Speciﬁcation/data table"); this does

not deplete ozone and is non-ﬂammable. It evaporates

at low temperatures.

In the evaporator, where heat is extracted from the

outside air, the refrigerant changes from its liquid into

its gaseous state. A compressor draws the process

medium in and compresses it. The increase in pressure

raises the refrigerant temperature.

This process requires electrical energy. The energy

(motor heat) is not lost, but reaches the condenser

downstream together with the compressed refrigerant.

Here, the process medium transfers heat to the water

tank. An expansion valve then reduces the still prevalent

pressure and the circular process starts again.

4.1 Function description

4.1.1 Heat pump operation

In heat pump mode, the heat pump unit located in

the upper section of the water heater extracts heating

energy from the ambient air.

This is the standard operating mode, which can be

used within the limits of scope of the water heater (see

chapter "Speciﬁcation/data table").

If the water heater was separated from

the power supply during operation, the

compressor will only restart if the pressure inside

the refrigerant circuit has been balanced. Pressure

balance can only be created after three minutes.

OPERATION

10 | ACCELERA 300 WWW.STIEBEL-ELTRON-USA.COM

4.1.2 Booster heater

Primarily, the water inside the tank is heated by the

heat pump.

When there is a higher hot water demand or when the

water heater was switched OFF for a longer period and

you require hot water quickly, you can accelerate the

heat-up process by means of the integral booster heater.

For energy saving reasons, the booster heater only heats

the top third of the tank (approx. 27 gallons).

A thermostat switches the booster heater on, if the water

temperature inside the tank falls below 112 °F (45 °C). A

thermostat switches the booster heater off, if the water

temperature inside the tank exceeds 140 °F (60 °C).

4.1.3 Defrosting

The lower limit of use of the water heater is permanently

set to 42 °F (6 °C). It is possible that at this limit, the

evaporator will be coated in frost. This is subject to the

air temperature and humidity level, particularly at low

hot water temperatures.

The compressor will be switched off as soon as the

evaporation temperature falls below 20 °F (-7 °C) for any

length of time. When the temperature at the evaporator

ﬁns rises above 38°F (3°C), the compressor starts again,

and the hot water heating continues. The fan continues

to run during defrosting.

5. Operation

You do not have to make any adjustments. The water

heater is therefore not equipped with any controls. The

hot water temperature is permanently set to 140 °F

(60 °C).

Should you wish to operate with different settings,

contact your local licensed installer.

WARNING Scalding

The water is heated inside the water tank to

140 °F (60 °C). There is a risk of scalding at

outlet temperatures in excess of 108 °F (42 °C).

Ensure that outﬂowing water does not directly

contact your body.

5.1 Start-up by a licensed installer

The water heater is initially started up after the

installation by a licensed installer has been completed.

5.2 Starting and stopping

The water heater is not equipped with any ON/OFF

switch. If a power plug was ﬁtted during installation, you

can disconnect the water heater from the power supply

by pulling that plug. Alternatively, you can terminate the

water heater operation by tripping the circuit breaker.

5.3 Emergency stop

In case of emergency, carry out the following steps:

»Isolate the power supply by tripping the circuit

breaker or by pulling the power plug that may have

been ﬁtted during installation.

»Close the cold water inlet.

6. Maintenance and care

A damp cloth is sufﬁcient for cleaning the water heater.

Never use abrasive or corrosive cleaning agents. Only

clean the water heater exterior. Never open the water

heater. Never spray the water heater with water.

»Monthly, check that the condensate drain in the

bottom of the water heater is not blocked by any

objects that may lie in front of the drain.

»Clean the strainer in the condensate drain at least

twice annually or subject to requirement. Sand and

dust can result in sludge building up inside the

strainer.

»Monthly, carry out a visual inspection of the

condensate pan drain (in the top of the water

heater; see the following diagram). For this, look

through the air intake grille at the front of the

water heater. If required, notify your local licensed

installer who will remove any contamination or

blockage.

26_03_01_1404

1 Condensate pan drain

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