Bosch TRONIC 3000 US3-2R Technisches Dokument

6 721 803 545 (2020/02) US

Installation Manual and Operating Instructions

Electric water heaters

TRONIC 3000

Models:US3-2R, US4-2R, US7-2R & US9-2R

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

For Service & Installation contact:

BOSCH Thermotechnology Corp.

65 Grove Street

Watertown, MA 02472

Phone 800-283-3787

Fax 603-965-7581

www.bosch-thermotechnology.us

Table of contents

Tronic 3000 – 6 721 803 545 (2020/02)

Table of contents

1 Explanation of Symbols and Important

Safety Instructions

1.1 Key to symbols

Warnings

In warnings, signal wordsat the beginning of a warning are used to

indicate the type and seriousness of the ensuing risk if measures

for minimising danger are not taken.

The following signal words are defined and can be used in this

document:

DANGER:

DANGER indicates a hazardous situation which, if not avoided,

will result in death or serious injury.

WARNING:

WARNING indicates a hazardous situation which, if not

avoided, could result in death or serious injury.

CAUTION:

CAUTIONindicatesahazardoussituationwhich,if notavoided,

could result in minor or moderate injury.

NOTICE:

NOTICE is used to address practices not related to personal

injury.

Important information

The info symbol indicates important information where there is

no risk to people or property.

Additional symbols

Table 1

1 Explanation of Symbols and Important Safety

Instructions. . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . .2

1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

1.2 IMPORTANT SAFETY INSTRUCTIONS. . . . . . . . . . . .3

1.3 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . .4

1.4 Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

2 Regulations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

3 Information about the product . . . . . . . . . . . . . . . . . . . .4

3.1 Package contents. . . . . . . . . . . . . . . . . . . . . . . . . . . .4

3.2 ProductDimensions andInteriorComponents. . . . .5

3.3 Technical Information . . . . . . . . . . . . .. . . . . . . . . . .7

4 Installation . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

4.1 Install Location. . . . . . . . . . . . . . . . . . .. . . . . . . . . . .7

4.2 Water connections. . . . . . . . . . . . . . . . . . . . . . . . . . .8

4.3 Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

4.4 Electrical connections . . . . . . . . . . . . .. . . . . . . . . . .9

4.5 Securing the unit to the wall . . . . . . . . . . . . . . . . . 10

5 Start up and operation . . . . . . . . . .. . . . . . . . . . . . . . . 11

5.1 Adjusting flow and regulating temperature . . . . . 11

5.2 Reset Thermal Cut-out. . . . . . . . . . . . . . . . . . . . . . 12

6 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6.1 Possible faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6.2 Electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . 14

7 Interior components and parts list . . . . . . . . . . . . . . . 15

Symbol Meaning

▶ a step in an action sequence

a reference to a related part in the document

•alistentry

–a list entry (second level)

Explanation of Symbols and Important Safety Instructions

Tronic 3000 – 6 721 803 545 (2020/02)

1.2 IMPORTANT SAFETY INSTRUCTIONS

HWhen using this electrical

equipment, basic safety

precautions should always be

followed, including the following:

▶READ AND FOLLOW ALL

INSTRUCTIONS.

▶ This appliance must be grounded.

▶ Disconnect this product from the

electrical supply before cleaning,

servicing or removing the cover.

▶ To reduce the risk of injury, close

supervision is necessary when the

product is used near children or

elderly persons.

▶ Do not install the heater in a location

where it may be subject to freezing.

▶ Do not install a check valve or any

other types of back flow preventer

within six feet of the cold water inlet.

▶ The electrical installation must

conform to current National Electrical

Codes.

▶ Do not switch the heater on if you

suspect that it may be frozen. Wait

until you are sure that it has

completely thawed out.

▶ This product shall be protected by a

Class A ground fault circuit

interrupter.

HInstallation and servicing.

▶ The installation and service of this

product must only be carried out by a

qualified person in accordance to

these instructions.

HAdditional Canadian Safety

Instructions

• A green terminal (or wire connector

marked "G", "GR", "GROUND", or

"GROUNDING")isprovidedwithinthe

control box. To reduce the risk of

shock connect a continuous copper

groundwirefromtheterminalblockto

the electric service panel in

accordance with the Canadian

Electrical Code Part 1.

HSAVE THESE INSTRUCTIONS

▶ Keep this guide in a safe place once

your Tronic 3000 unit has been

installed.

▶ You may need to refer to it for general

instructions or future maintenance.

Regulations

Tronic 3000 – 6 721 803 545 (2020/02)

1.3 Safety information

Fig. 1

The chart below shows the relationship between water

temperature and time until there is a risk of scalding. It can be

used as the basis for determining the safest water temperature

for your application.

Table 2 Approximate time-temperature relationship until

there is a risk of scalding

WARNING:

Thisproduct canexpose youto chemicalsincluding lead, which

is known to the State of California to cause cancer and birth

defects or other reproductive harm. For more information go to

www.P65Warnings.ca.gov.

1.4 Disclaimer

Commonwealth of Massachusetts

As a condition of installing this product in the Commonwealth

ofMassachusetts apressurereliefvalve shall beinstalled onthe

cold water side, by a licensed plumber MGL 142 Section 19.

2Regulations

Any federal, state, and local laws and regulations pertaining to

installation and use of electric water heater appliances must be

observed.

• The electrical installation must conform to current National

Electrical Codes.

• To reduce the risk of electrical shock, connect the GR

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

• This product shall be protected by a Class A ground fault

circuit interrupter.

• 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 circuitbreakerlockoutoradditional localmeans

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.

3 Information about the product

3.1 Package contents

• Electric water heater

• 4 No. 8 wood screws and anchors

• Documentation

Temperature Time to severe scalding1)

1) Source: Moritz, A.R. and Henriques, F.C., Jr. (1947).

Studies of thermal injury. II. The relative importance of

time and surface temperature in the causation of

cutaneous burns, Am J of Pathol, 23, 695-720.

120 °F (49 °C) longer than 5 minutes

125 °F (51 °C) 1.5 to 2 minutes

130°F(54°C) approx.30seconds

135 °F (57 °C) approx. 10 seconds

140 °F (60 °C) less than 5 seconds

145 °F (62 °C) less than 3 seconds

150 °F (65 °C) approx. 1.5 seconds

155 °F (68 °C) approx. 1 second

Information about the product

Tronic 3000 – 6 721 803 545 (2020/02)

3.2 Product Dimensions and Interior Components

Fig. 2 Product dimensions (mm)

Information about the product

Tronic 3000 – 6 721 803 545 (2020/02)

Fig. 3 Interior Components

[1] Mounting hole (backplate)

[2] Upper trim

[3] Thermal cut-out (manual re-set)

[4] Neon light

[5] Heating elements

[6] Terminal block

[7] Cable grommet

[8] Cable clamp

[9] Cable entry

[10] Serial and model sticker

[11] Cold water inlet

[12] Hot water Outlet

[13] Flow switch

1345

6721803545-01.1V

Installation

Tronic 3000 – 6 721 803 545 (2020/02)

3.3 Technical Information

Table 3 Technical data and temperature rise information

The temperature rises are based on the higher voltage values

(i.e. 240 and 120):lower voltages will cause a lower

temperature rise.

To operate correctly the unit needs the following running water

pressures:

Table 4 Water pressure requirements

4 Installation

DANGER:

Risk of electric shock!

▶ For safety reasons, disconnect the power supply to the

heater before any service or testing is performed.

WARNING:

▶ This heater must be electrically grounded in accordance

withthemost recentedition oftheNational ElectricalCode.

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.

4.1 Install Location

NOTICE:

Appliance damage!

▶ The water heater must be mounted on a vertical wall or

surface and positioned with water and power connections

shown in Fig. 13.

Protection areas 1 and 2

▶ Do not install the heater in protection areas 1 and 2

(Fig. 4).

Model Volts Amps

1) Current draw for maximum voltage

Element

Resistance

Loading (watts) Temperature Rise (deg F) at Flow rate (GPM)

For high Rated Power

Low High 0.3

GPM

0.4

GPM

0.5

GPM

0.75

GPM

1.0

GPM

1.5

GPM

2.0

GPM

2.5

GPM

US3-2R 110-120 15 1x8 1513 - 1800 41 31 24 16 12 865

US3-2R 110-120 30 2x8 3025 - 3600 82 61 49 33 24 16 12 10

US4-2R 208-240 91x25 1891 - 2250 2)

2) Value is below the activation flow.

38 31 20 15 10 8 6

US4-2R 208-240 19 2x25 3781 - 4500 2) 76 61 41 31 20 15 12

US7-2R 208-240 15 1x16 3025 - 3600 2) 2) 2) 33 24 16 12 10

US7-2R 208-240 30 2x16 6050 - 7200 2) 2) 2) 65 49 33 24 20

US9-2R 208-240 20 1x12 3576 - 4760 2) 2) 2) 43 32 22 16 13

US9-2R 208-240 40 2x12 7151 - 9521 2) 2) 2) 86 65 43 32 26

Model Running pressures

US 3 Minimum: 25 psi (1,7 bar)

US 4/7/9 Minimum: 10 psi (0,7 bar)

All models Maximum: 150 psi (10,3 bar)

Installation

Tronic 3000 – 6 721 803 545 (2020/02)

▶ Install the heater outside the protection areas and keep a

minimum distance of 24" (60cm) from the bathtub.

Fig. 4 Protection areas for bathtub or shower stall

DANGER:

Risk of electric shock!

▶ Ensure that the appliance is disconnected from power and

all circuits breakers are off before performing any work.

4.1.1 Freeze prevention

If the heater must be left in a space that is subject to freezing

temperatures, all water must be drained from the heater.

Freezing damage is not covered under the warranty.

NOTICE:

Appliance damage!

▶ Use of agents like anti-freeze are not allowed as they may

cause damage to the water heater’s internal components.

Draining the heater

Follow the procedure below to best minimize the chance of

freeze damage:

▶ Disconnect electric supply.

▶ Disconnect cold and hot water pipes from fittings on

bottom of heater. Allow water to drain out.

▶ After allowing all water to drain out, the heater should be

blown out with low pressure compressed air to remove as

much water as possible.

4.2 Water connections

▶ The 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.

▶ We recommend that you use ½" copper or high pressure

flex connections rated to a minimum of 150 psi.

▶ Use Teflon tape for sealing pipe threads. Do NOT use pipe

dope.

▶ The inlet and outlet are clearly marked on the unit. They

each is a male ½" NPT fitting.

▶ If the unit is to supply a sink, we recommend that you use

aerators.

▶ If the unit is to supply more than one sink, the aerator

should be the same at each tap if they are to be used at the

same time.

▶ Before the unit is connected to the water supply flush the

pipes to remove, flush the incoming pipework with water to

remove any debris or loose particles. Failure to do so may

make the unit inoperable.

4.3 Water quality

Water quality will have an impact on appliance longevity.

If water quality exceeds one or more of the values specified on

table 5, water softening/conditioning is required.

Table 5 Maximum acceptable water quality parameters

24 in

(60 cm)

(225 )cm

6721803545-23.1V

(60 cm)

24 in

89 in

Description Max. Levels

pH pH 6.5 - 8.5

TDS (Total Dissolved

Solids) mg/l or ppm 500

Total hardness mg/l or ppm 100

(6 grains)

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

Installation

Tronic 3000 – 6 721 803 545 (2020/02)

4.4 Electrical connections

Table 6 Electrical requirements

Connecting the unit to power

▶ Strip back the outer insulation on the power wires about

1 3/8" (35mm) and the conductor 3/8" (9.5mm)

(Fig. 5).

Fig. 5

▶ Undotheretainingscrewson thecover(x4)and removethe

cover of the unit.

Fig. 6

▶ Remove lower trim held by a single screw (Fig. 7).

Fig. 7

▶ Break off relevant plastic piece of lower trim to allow cable

to enter the product (Fig. 8 and fig. 9). For acceptable

installation positions and cable entry points fig. 13.

Fig. 8

Fig. 9

▶ Feed the cable through the cable grommet.

Model Rated

Voltage

(V)

Rated

Current

(A)

Minimum

requiredwire

Size (AWG)

Fuse

Protection

(A)

US3-2R 120 30 10 30

US4-2R 240 20 10 30

US7-2R 240 30 10 30

US9-2R 240 40 850

x 1

6721803545-06.1V

Installation

Tronic 3000 – 6 721 803 545 (2020/02)

▶ Connect the cables to the terminal block (Fig. 10):

insulation needs to be through the end of the grommet to

provide a good seal.

Fig. 10

▶ Ensure that all the terminal block screws are tightened

securely.

▶ Set the Power Selector Screw to the desired setting. If it is

set to LO (Fig. 12), only one heating element will

operate and the output will be half power. See the Table 3

for temperature rise at various flow rates. If the element is

set on HI (Fig. 11), both heating elements will operate

and the output will be full power (default setting). When

setting the Power Selector Screw, ensure that the screw is

adjusted all the way to the end of the slot and that it is well

tightened.

Fig. 11 Full power (HI)

Fig. 12 Half power (LO)

4.5 Securing the unit to the wall

4.5.1 Deciding the position

▶ If being used in a public place, position theunit out of reach

to discourage vandalism.

▶ Mount the unit onto a flat section of wall away from any

potential splashes of water or spray.

Keep the lengths of hot water pipe to a minimum in order to

reduce thermal loss.

▶ If the unit is to supply a sink, install it either above or below

the sink.

6721803545-18.1V

6721803545-21.1V

6721803545-22.1V

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