Bosch AE12 User manual

Installation and Operating instructions

Electric water heaters

AE 12

en Installation Manual and Operating Instructions 2

es Instrucciones de instalación y funcionamiento 17

fr Instructions d'installation et d'utilisation 34

6 720 800 531 (2011/09) US

IMPORTANT: This booklet should be given to the customer after installation and demonstration.

For Service & Installation contact:

BOSCH Thermotechnology Corp.

50 Wentworth Avenue, Londonderry

NH 03053

Phone: 866-330-2729

www.bosch-climate.us

Table of contents

6 720 800 531 (2011/09)

Table of contents

1 Explanation of Symbols and Important Safety

Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Explanation of symbols . . . . . . . . . . . . . . . 3

1.2 Important Safety Instructions . . . . . . . . . . 3

2 Information about the heater . . . . . . . . . . . . . . . 4

2.1 Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1.1 Approval number . . . . . . . . . . . . . . . . . . . . 4

2.2 Technical identification code . . . . . . . . . . 4

2.3 Model name and number identification . . 4

2.4 Package contents . . . . . . . . . . . . . . . . . . . 4

2.5 General description . . . . . . . . . . . . . . . . . . 5

2.6 Function . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.1 Important information . . . . . . . . . . . . . . . . 8

4.1.1 Freeze prevention . . . . . . . . . . . . . . . . . . . 8

4.2 Installing the AE 12 . . . . . . . . . . . . . . . . . . 8

4.3 Water connections . . . . . . . . . . . . . . . . . . 9

4.3.1 Water quality . . . . . . . . . . . . . . . . . . . . . . . 9

4.4 Electrical connections . . . . . . . . . . . . . . . 10

4.5 Securing the unit to the wall . . . . . . . . . . 11

4.5.1 Deciding the position . . . . . . . . . . . . . . . 11

4.5.2 Deciding the wiring route . . . . . . . . . . . . 11

4.5.3 Mounting on the wall . . . . . . . . . . . . . . . 12

5 Starting up the AE 12 . . . . . . . . . . . . . . . . . . . . 13

5.1 Sink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2 Adjusting the flow . . . . . . . . . . . . . . . . . . 13

5.3 Appendix Flow vs. Temperature

Setting Guide . . . . . . . . . . . . . . . . . . . . . . 14

6 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 15

6.1 For the Installer . . . . . . . . . . . . . . . . . . . . 15

6.2 For the User . . . . . . . . . . . . . . . . . . . . . . 15

7 Interior components and parts list . . . . . . . . . 16

Explanation of Symbols and Important Safety Instructions

6 720 800 531 (2011/09)

1 Explanation of Symbols and Important Safety Instructions

1.1 Explanation of symbols

Warnings

Signal words at the beginning of a warning are used to

indicate the type and seriousness of the ensuing risk if

measures for minimizing damage are not taken.

•NOTE indicates that minor damage to property may

occur.

•CAUTION indicates possible minor to medium

personal injury.

•WARNING indicates possible severe personal injury.

•DANGER indicates that severe personal injury may

occur.

Important information

Additional symbols

1.2 Important Safety Instructions

When using this electrical equipment, basic safety

precautions should always be followed, including the

following:

BRead and follow all instructions.

BThis appliance must be grounded.

BDisconnect this product from the electrical supply

before cleaning, servicing or removing the cover.

BTo reduce the risk of injury, close supervision is

necessary when the product is used near children or

elderly persons.

BWarning: Indoor installation only, where it will NOT be

exposed to freezing.

BWarning: Do not install a check valve or any other

types of back flow preventer within six feet of the cold

water inlet.

BThe electrical installation must conform to current

National Electrical Codes.

BWarning: Do not switch the heater on if you suspect

that it may be frozen. Wait until you are sure that it

has completely thawed cut.

BThe AE 12 is designed to heat potable cold water for

domestic purposes. Contact Bosch

Thermotechnology before specifying or installing the

appliance in any other application.

Additional Canadian Safety Instructions

•A green terminal (or wire connector marked "G", "GR",

"GROUND", or "GROUNDING") is provided within the

control box. To reduce the risk of electric shock,

connect this terminal or connector to the grounding

terminal of the electric service of supply panel with a

continuous copper wire in accordance with the

Canadian Electrical Code, Part I.

•This product shall be protected by a Class A ground

fault circuit interrupter.

Safe these instructions

BKeep this guide in a safe place once your AE 12 unit

has been installed.

BYou may need to refer to it for general instructions or

future maintenance.

Warnings are indicated in the text by a

warning triangle and a gray background.

In case of danger due to electric shock, the

exclamation point on the warning triangle is

replaced with a lightning symbol.

Important information that presents no risk

to people or property is indicated with this

symbol. It is separated by horizontal lines

above and below the text.

Symbol Meaning

BSequence of steps

→

Cross-reference to other points in this

document or to other documents

•Listing/list entry

–Listing/list entry (2nd level)

Table 1

Information about the heater

6 720 800 531 (2011/09)

2 Information about the heater

2.1 Disclaimer

2.1.1

Approval number

Commonwealth of Massachusetts

As a condition of installing this product in the

Commonwealth of Massachusetts a pressure relief valve

shall be installed on the cold water side, by a licensed

plumber MGL 142 Section 19.

(Approval number: P1-09-25).

2.2 Technical identification code

US Electronic Instantaneous

12 Maximum output (kW)

MMechanical temperature control

WWall hung

IIndoor

HHorizontal installation

BWater connections

2.3 Model name and number

identification

2.4 Package contents

•Electric water heater

•4 No. 8 wood screws

US 12 M W I H B

Table 2

Model Name Model Number

AE 12 US 12 M W I H B

Table 3

Information about the heater

6 720 800 531 (2011/09)

2.5 General description

Fig. 1

1Mouting hole

2Heat exchanger tube

3Control P.C.B

4Heating elements

5Terminal block

6Cable rear entry

7Ground stud

8Cable clamp

9Cable side entry

10 Neon light

11 Hi temp thermal cut-out (manual re-set)

12 Cover fixing screw

13 Flow switch

6720646914-01.1V

1 2 3

Outlet Inlet

Information about the heater

6 720 800 531 (2011/09)

2.6 Function

•Water comes in through the cold water inlet.

•The flow switch senses water is passing through the

unit. If it detects more than the pre-set level, the

unit’s heating the elements switch on. This is shown

by the neon light glowing.

•The water is heated instantly as it pas ses through the

copper heat exchanger tube.

•The unit is Thermostatic i.e. it will switch the

elements on and off in order to maintain a constant

outlet temperature.

The temperature of the water coming out of the unit

depends on:

•The voltage of the electrical supply,

•The temperature of the incoming water.

•The setting of the temperature dial.

A high flow rate can also negatively effect the hot water

temperature.

Depending on the region of the country, the temperature

of the water supply can vary from 40°F in winter to about

70°F in the summer, with an average of about 50°F.

Extreme weather conditions can cause the inlet

temperature to go outside these boundaries, making it

necessary to adjust the Temperature Adjustment

Spindle and/or the inlet water flow

Manual reset thermal cut-out

•The unit has one double pole thermal cut out which is

mounted on the heat exchanger tube.

•When tripped the cut out needs to be reset manually

inside the unit.

•The cut-out will trip only in exceptional circumstances

(Fig. 2). Call your service person or Bosch

Thermotechnology Corp. if this happens frequently.

Fig. 2

AThermal cut out

The heater is designed for cold water supply

only. Do not supply with pre-heated water.

WARNING:

BAlways switch off the electrical supply to

the unit before you remove the cover.

Regulations

6 720 800 531 (2011/09)

3 Regulations

Any local by-laws and regulations pertaining to

installation and use of electric water heater appliances

must be observed. Please refer to the laws that should

be attended in your country.

•The electrical installation must conform to current

National Electrical Codes.

•To reduce the risk of electrical shock, connect this

terminal or connector to the grounding terminal of the

electrical service of supply panel with a continuous

copper wire in accordance with the Canadian

Electrical Code, Part I.

•This product shall be protected by a Class A ground

fault circuit interrupter.

•In the Commonwealth of Massachusetts a licensed

plumber or electrician must perform the installation.

(Approval number: P1-09-25).

•In the Commonwealth of Massachusetts a pressure

relief valve shall be installed on the cold water side by

a licensed plumber. (MGL 142 Section 19, Approval

number P1-09-25).

•The unit must be wired by a qualified electrician, in

accordance with the current version of the National

Electrical Code US) or Canadian Electric Code

(Canada).

•When the heater is not within sight of the electrical

circuit breakers, a circuit breaker lockout or

additional local means of disconnection for all non-

grounded conductors must be provided that is within

sight of the appliance. (Ref NEC 422.31.).

•The power cable size and the installation must be in

accordance with the Canadian Electrical Code, C22.1-

02.

WARNING:

California Proposition 65 lists chemical

substances known to the state to cause

cancer, birth defects, death, serious illness

or other reproductive harm. This product

may contain such substances, be their

origin from fuel combustion (gas, oil) or

components of the product itself.

Installation

6 720 800 531 (2011/09)

4 Installation

4.1 Important information

Please follow these instructions. Failure to follow

instructions may result in:

•Damage or injury.

•Improper installation/operation.

•Loss of warranty.

4.1.1 Freeze prevention

Introduction

Please note that the installation manual states that the

water heater must not be installed in a location where it

may be exposed to freezing temperatures. If the heater

must be left in a space that is likely to experience

freezing temperatures, all water must be drained from

the heater.

Freeze damage is not covered under the warranty.

Draining the heater

Due to the shape of the heat exchangers and connecting

pipe, it is extremely difficult to get all of the water out of

the heater. Follow the procedure below to best minimize

the chance of freezing:

BDisconnect electric supply.

BDisconnect cold and hot water pipes from fittings on

bottom of heater. Allow water to drain out (have a

catch basin ready).

BAfter allowing all water to drain out, the heater should

be blown out with low pressure compressed air to

remove as much water as possible from water heater

modules. Bursts of air work better than continuous

flow.

Remember, these suggestions are only made to help

minimize the potential for freeze damage and are not to

be construed as the guaranteed method for dealing with

freeze possibilities.

4.2 Installing the AE 12

To operate correctly the unit needs the following

running pressures:

Sink

•Min: 10 psi (0,7 bar)

•Max: 150 psi (10,3 bar)

DANGER: Risk of electric shock!

BFor safety reasons, disconnect the power

supply to the heater before any service or

testing is performed.

WARNING:

BThis heater must be electrically grounded

in accordance with the most recent

edition of the National Electrical Code.

NFPA 70. In Canada, all electrical wiring

to the heater must be in accordance with

local codes and the Canadian Electrical

Code, CSA C22.1 Part 1.

DANGER:

BThe installation must only be performed

by a qualified person in accordance with

these instructions.

BBosch Thermotechnology Corp. is not

responsible for improperly installed

appliances.

WARNING:

BThe heater must only be mounted in a

vertical position with the water fittings

located at the bottom of the heater.

Under no circumstances should the

heater be mounted differently.

WARNING:

BELECTRICITY IS EXTREMELY

DANGEROUS. TAKE EXTRA

PRECAUTIONS AND ENSURE ALL

CIRCUIT BREAKERS ARE OFF BEFORE

PERFORMING ANY WORK TO THE

HEATER.

Use of agents like anti-freeze are not

allowed as they may cause damage to the

water heater’s internal components.

WARNING:

BDo not install the AE 12 in a room where

there is a chance of freezing.

NOTE:

BRead entire instructions.

BCheck the pressure of the main water

supply.

Installation

6 720 800 531 (2011/09)

4.3 Water connections

BThe unit should be connected directly to the main

cold water supply and not to pre- heated water. The

unit should be installed with service valves on both

the inlet and outlet. These valves can be used to turn

off the water supply to the unit if it needs servicing, or

to reduce the water flow if it is too high.

BWe recommend that you use ½" copper or high

pressure flex connections.

BUse Teflon tape for sealing pipe threads. Do NOT use

pipe dope.

BRemember to keep the hot water pipe runs as short

as possible. In some cases it may be worth fitting a

second unit to serve an additional fixture.

BThe inlet and outlet are clearly marked on the unit.

They each have a ½" NPT connector.

BIf the unit is to supply more than one sink, a similarly

flow restricted aerator should be used at each tap. If

not, the highest flowing outlet will take all the water

under dual usage.

BIf the unit is to supply a sink, we recommend that you

use aerators, which you can get from your local

distributor/dealer.

BAfter the unit has been plumbed in, and before you

wire it, flush it with water to remove any debris or

loose particles. Failure to do so may make the unit

inoperable.

4.3.1 Water quality

Water quality can have an impact on appliance longevity

and may not be covered under the manufacturer's

warranty.

BFor water analysis data call your local water

department, or if on a well, have well water analyzed

periodically.

If water quality exceeds one or more of the values

specified below, Bosch recommends consulting a

local water treatment professional for water

softening/conditioning options.

As a condition of installing this product in

the Commonwealth of Massachusetts a

pressure relief valve must be installed on

the cold water side by a licensed plumber.

MGL 42 Section 19.

WARNING:

BThe unit must be installed by a qualified

electrician.

BThe unit must be grounded.

BConnect the unit to power.

Description Max. Levels

pH pH 6.5 - 8.5

TDS (total Dissolved mg/l or ppm 500

Total hardness mg/l or ppm 100

Aluminum mg/l or ppm 2.0

Chlorides mg/l or ppm 250

Copper mg/l or ppm 1.0

Iron mg/l or ppm 0.3

Manganese mg/l or ppm 0.05

Zinc mg/l or ppm 5.0

Table 4

Installation

6 720 800 531 (2011/09)

4.4 Electrical connections

BStrip back the insulation on the power wires about 3/

8". Any insulation on the ground should be stripped

back about 3/4".

BFeed the cable through the cover bottom or backplate

entry grommets, as appropriate.

BConnect the cables to the terminal block and ground

stud (Fig. 3):

Fig. 3 Cable termination

BMake sure that all the terminal block screws are

tightened securely. Loose connections can cause

wires to neat up.

BMake sure that the ground wire is wrapped around its

terminal stud and into the saddle washer. The nut

should be tightened securely.

BAttach the front cover and tighten the retaining

screws.

Model

Rated

Voltage

(V)

Rated

Current

(A)

Recommend

Wire Size

(AWG)

US12 240 50 6

Table 5

NOTE:

When the AE 12 is not within sight of the

electrical circuit breakers, a circuit breaker

lockout or additional local means of

disconnection for all non grounded

conductors must be provided that is within

sight of the appliance. (REF NEC 422.31)

Rubber

Sleeve

Ground

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