STIEBEL ELTRON DHC10-2 User Manual

OPERATION AND INSTALLATION UTILISATION ET INSTALLATION OPERACIÓN E INSTALACIÓN

TANKLESS ELECTRIC WATER HEATER | CHAUFFE-EAU ÉLECTRIQUE SANS ACCUMULATEUR | CALENTADOR DE AGUA INSTANTANEOS SIN TANQUE

» DHC 3-1 » DHC 3-2 » DHC 4-2 » DHC 4-3 » DHC 5-2 » DHC 6-2 » DHC 8-2 » DHC 9-3 » DHC 10-2

84335

The DHC series is tested and certiﬁed by WQA against NSF/ANSI 372 for lead free compliance.

CONTENTS | OPERATION

OPERATION

1. General information ��2

1.1 Safety information �� 2

1.2 Other symbols in this document �� 2

2. Safety �� 2

2.1 Intended use �� 3

2.2 General Information�� 3

2.3 Safety Precautions �� 3

2.4 Test symbols �� 3

3. General ��3

INSTALLATION

4. Mounting the unit ��4

5. Water connections ��4

6. Electrical connection ��5

7. Putting the water heater into operation �� 5

8. Normal maintenance �� 5

9. Technical Data ��6

9.1 Wiring diagram �� 6

9.2 Data table �� 7

10. Temperature increase above ambient water temperature ��8

11. Troubleshooting ��9

12. Spare parts �� 10

WARRANTY | ENVIRONMENT AND RECYCLING

1.1 Safety information

1.1.1 Structure of safety information

KEYWORD Type of risk Here, possible consequences are listed that may result from not observing the safety information.

 Steps to prevent the risk are listed.

1.1.2 Symbols. type of risk

Symbol Type of risk

Injury

!

1.1.3 Keywords

KEYWORD Description

DANGER If this information is not observed, it will result in serious

WARNING If this information is not observed, it can result in serious

CAUTION If this information is not observed, it can lead to medium

Electrocution

Burns or scalding

injury or death.

or minor injury.

OPERATION

1. General information

Note

Read these instructions carefully before using the appliance and familiarize yourself with its functions. Keep these instructions safe. Pass on the instructions to a new user if required.

1.2 Other symbols in this document

Note

Notes are bordered by horizontal lines above and below the text. General information is identiﬁed by the symbol shown on the left.

 Read these notes carefully.

Symbol

Damage to the appliance and environment

!

 This symbol indicates that you have to do something. The ac-

tion you need to take is described step by step.

Appliance disposal

2. Safety

Observe the following safety information and regulations. Operate the appliance only when fully installed and with all safety

equipment ﬁtted.

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OPERATION

GENERAL

2.1 Intended use

The appliance is intended for heating domestic hot water and can supply one draw-off point.

Any other use beyond that described shall be deemed inappropriate.

Observation of these instructions is also part of the correct use of this appliance.

2.2 General Information

This appliance is designed for domestic use. It can be used safely by untrained persons. The appliance can also be used in a nondomestic environment, e.g. in a small business, as long as it is used in the same way.

Read this entire manual. Failure to follow all the guides, instructions and rules could cause personal injury or property damage. Improper installation, adjustment, alteration, service and use of this appliance can result in serious injury.

This appliance must be installed by a licensed electrician and plumber. The installation must comply with all national, state and local plumbing and electric codes. Proper installation is the responsibility of the installer. Failure to comply with the installation and operating instructions or improper use voids the warranty.

Save these instructions for future reference. Installer should leave these instructions with the consumer.

If you have any questions regarding the installation, use or operation of this water heater, or if you need any additional installation manuals, please call our technical service line, see last side.

2.3 Safety Precautions

DANGER Injury

!

Please read and follow these instructions. Failure to follow these instructions could result in serioius personal injury or death.

Damage to the appliance and the environment

!

The appliance must be installed by a licensed electrician and plumber. The installation must comply with all national, state and local plumbing and electric codes. Service of the appliance must be performed by qualiﬁed service TECHNICIANS.

DANGER Electrocution Before proceeding with any installation, adjustment. alteration, or service of this appliance all circuit breakers and disconnect switches servicing the appliance must be turned off. Failure to do so could result in serious personal injury or death.

DANGER Electrocution Never remove the appliance‘s cover unless the electricity servicing the appliance is turned off. Failure to do so could result in personal injury or death.

DANGER Electrocution The appliance must be properly grounded. Failure to electrically ground the product could result in serious personal injury or death.

DANGER Burns Water temperatures over 125°F (52 °C)can cause severe burns instantly or death from scalding.

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 provided that they are supervised or they have been instructed on how to use the appliance safely and have understood the resulting risks. Children must never play with the appliance. Children must never clean the appliance or perform user maintenance unless they are supervised.

2.4 Test symbols

See type plate on the appliance.

3. General

The DHC tankless water heater differs from conventional storage type water heaters in several ways. It does not store hot water. Instead, water is heated instantaneously as it ﬂows through the unit. The powerful heating elements are activated by a ﬂow switch as water is drawn from a hot water faucet connected to the DHC. Due to the absence of stand-by losses, the DHC has greater energy efﬁciency than storage type water heaters.

The temperature of the hot water delivered by the DHC depends on the wattage of the heating element, the temperature of the incoming cold water, and the water ﬂow rate through the unit. In order for the DHC to operate properly, it must be carefully matched to the application.

In case you have questions regarding the way you plan to use the DHC, please call our technical service line at 800-582-8423 (USA and Canada). For service outside the U.S. and Canada, please call us at USA 413-247-3380. You can also e-mail us at info@stiebel-eltronusa.com or fax us at 413-247-3369.

The DHC can be used for hand washing type applications in the U.S. and Canada:

- Restroom sinks in commercial/industrial facilities and homes

- Kitchen areas in commercial /industrial facilities and homes

- Cabins

- Special uses in photo developing shops, laboratories etc.

The DHC can also be used for whole apartments and homes in warm climate zones such as the Caribbean region, Central America and Mexico due to the higher ambient water temperatures.

ENGLISH

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INSTALLATION

MOUNTING THE UNIT

INSTALLATION

4. Mounting the unit

5. Mount unit securely to wall by putting two screws through mounting holes. Screws and plastic wall anchors for mounting on masonry or wood are provided.

8

1

1 Electrical junction box 2 Water supply line for faucet installation 3 3/8“ compression-T 4 Shut-off valve 5 1/2“ main pipe 6 Sink 7 Cold valve (right) 8 Hot valve (left)

7

6

5 4

3 2

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26�02�02�033126�02�02�1355

DANGER Electrocution UNIT MUST BE INSTALLED IN A VERTICAL POSITION WITH THE WATER FITTINGS POINTING DOWNWARD. DO NOT INSTALL UNIT WHERE IT WOULD ROUTINELY BE SPLASHED WITH WATER. ELECTRIC SHOCK MAY RESULT.

1. Install DHC as close as possible to the hot water draw-off point, for example, directly underneath the sink or next to the shower stall.

2. Install DHC in a frost free area. If frost may occur, remove unit before freezing temperatures set in.

3. Leave a minimum of 5“ of clearance on all sides for servicing.

4. Remove plastic cover.

5. Water connections

1. All plumbing work must comply with national and applicable state and local plumbing codes.

2. A pressure reducing valve must be installed if the cold water supply pressure exceeds 150 PSI (10 bar).

3. Make certain that the cold water supply line has been ﬂushed to remove any scale and dirt.

4. Install isolating valve in cold water line as shown in illustration. This allows the unit to be isolated for maintenance purposes.

5. Cold water connection (inlet) is on the right side of the unit, hot water connection (outlet) is on the left side of unit.

Note

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EXCESSIVE HEAT FROM SOLDERING ON COPPER PIPES NEAR THE DHC MAY CAUSE DAMAGE.

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INSTALLATION

ELECTRICAL CONNECTION

6. Tankless water heaters such as the DHC are not required to be equipped with a Pressure and Temperature Relief Valve (PTRV). If the local inspector will not pass the installation without a PTRV, it should be installed on the hot water outlet side of unit.

7. In case you are connecting to 1/2“ water pipe, solder 1/2“ NPT tapered female adapter by copper on ends of cold and hot water lines. In case you are connecting to 3/8“ water pipe, use a 1/2“ female pipe thread by 3/8“ compression adapter. Braided ﬂexible connectors will work as well. Connect cold and hot water lines to the unit.

8. When all plumbing work is completed, check for leaks and take corrective action before proceeding.

6. Electrical connection

DANGER Electrocution BEFORE BEGINNING ANY WORK ON THE ELECTRIC INSTALLATION, BE SURE THAT MAIN BREAKER PANEL SWITCH IS „OFF“ TO AVOID ANY DANGER OF ELECTRIC SHOCK. ALL MOUNTING AND PLUMBING MUST BE COMPLETED BEFORE PROCEEDING WITH ELECTRICAL HOOK-UP. WHERE REQUIRED BY LOCAL, STATE OR NATIONAL ELECTRICAL CODES THE CIRCUIT SHOULD BE EQUIPPED WITH A „GROUND FAULT INTERRUPTER“.

1. All electrical work must comply with national and applicable state and local electrical codes.

2. The DHC should be connected to a properly grounded dedicated branch circuit of proper voltage rating. In installa tions with several DHC units, each unit requires an independent circuit. Please refer to the technical data table for the correct wire and circuit breaker size.

3. The wire must be fed through the rubber seal located between the hot and cold water connections. Then feed wires through strain relief clamp and tighten clamp down on wire. The „live“ wires must be connected to the slots on the terminal block marked N and L (DHC 3-1 only) or L and L (all other versions). The ground wire must be connected to slot marked with the ground symbol.

4. Reinstall plastic cover.

7. Putting the water heater into operation

WARNING

!

OPEN HOT WATER FAUCET FOR A FEW MINUTES UNTIL WATER FLOW IS CONTINUOUS AND ALL AIR IS PURGED FROM WATER PIPES. THE UNIT’S PLASTIC COVER MUST BE INSTALLED BEFORE THE CIRCUIT BREAKER IS TURNED ON.

1. Turn on circuit breaker to bring electrical power to the unit.

2. Open hot water faucet to a degree so that water ﬂow is „typi-

cal“ i.e. until the water ﬂow is the same as that encountered during normal use.

3. Wait twenty seconds until temperature has stabilized. Then

check water temperature. If temperature is too low, the water ﬂow rate needs to be reduced. In order to do this, turn off the unit’s circuit breaker, remove the cover and turn the ﬂow adjustment screw shown in illustration clockwise 1/2 turn (180 degrees). Then reinstall plastic cover, turn on circuit breaker and check water temperature. This procedure should be repeated until the desired temperature is achieved. In case the water temperature is too high, turn the ﬂow adjustment screw counter clockwise in the same manner until the desired temperature is achieved. The arrows in illustration refer to the water temperature.

4. In order to obtain temperature control at a single spout mix-

er-type faucet, restrict cold water ﬂow to faucet by partially closing the cold water shut-off valve under the sink until cold water and hot water ﬂow rates are approximately the same.

8. Normal maintenance

STIEBEL ELTRON DHC tankless heaters are designed for a very long service life. Actual life expectancy will vary with water quality and use. The unit itself does not require any regular maintenance. However, to ensure consistent water ﬂow, it is recommended to periodically remove scale and dirt that may build up at the aerator of the faucet or in the shower head. Also, the DHC has a built in ﬁlter screen that should be cleaned from time to time. In order to do this, turn off the cold water supply at the isolating valve and remove the ground wire. Twist cold water supply tube counterclock wise by 90° and pull towards bottom of unit. Clean screen and put the screen, the cold water supply tube and the ground wire back into their original position. Please be sure that the ground wire is reinstalled and that ground screw is securely tightened after this procedure.

ENGLISH

Note

OTHER THAN THE FILTER SCREEN, THE DHC DOES NOT CONTAIN ANY PARTS SERVICEABLE BY THE LAY PERSON.

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DANGER Electrocution AS WITH ANY ELECTRIC APPLIANCE, FAILURE TO ELECTRICALLY GROUND UNIT MAY RESULT IN SERIOUS INJURY OR DEATH.

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IN CASE OF MALFUNCTION PLEASE CONTACT A LICENSED PLUMBER OR ELECTRICIAN.

INSTALLATION

TECHNICAL DATA

9. Technical Data

b01

360 (14.17")

9.1 Wiring diagram

DHC 3-2, DHC 4-2, DHC 5-2

2/GRD ~ 208 / 240 V

DHC 4 -3

2/GRD ~ 277 V

273 (10.75")75 (2.953")

V

c06

c06 c01

8 (0.315")

b01 electrical supply cable c01 cold water connection " NPT 1/2 c06 hot water connection " NPT 1/2

100 (3.94")

200 (7.88")

c01

38 (1.5")

110 (4.33")

D0000021558

DHC 6-2, DHC 8-2, DHC 10-2

A

DHC 9 -3

A

DHC 3-1

B

2/GRD ~ 208 / 240 V

2/GRD ~ 277 V

1/N/GRD ~ 120 V

V

LL

85�02�02�0008

A

B

LL

NL

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85�02�02�0009

INSTALLATION

TECHNICAL DATA

9.2 Data table

DHC 3-1 DHC 3-2 DHC 4-2 DHC 4-3 DHC 5-2 DHC 6-2 DHC 8-2 DHC 9-3 DHC 10-2

074050

Electrical details Voltage V 120 208 240 208 240 277 208 240 208 240 208 240 277 208 240 Wattage kW 3.0 2.5 3.5 2.9 3.8 4.5 3.6 4.8 4.5 6.0 5.4 7.2 9 7. 2 9.6 Ampere A 25 12 14 14 16 17 18 20 22 25 26 30 32.5 35 40 Min. required circuit breker size A 30 15 20 20 20 20 30 30 30 30 30 40 40 50 50 Required wire size AWG

Copper Power connection 1/N/GRD 2/GRD 2/GRD 2/GRD 2/GRD 2/GRD 2/GRD 2/GRD 2/GRD Connections Water connection 1/2“ NPT 1/2“ NPT 1/2“ NPT 1/2“ NPT 1/2“ NPT 1/2“ NPT 1/2“ NPT 1/2“ NPT 1/2“ NPT Total alkaline earths mol/m³ 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 Total hardness (H2O) Degree d 14 14 14 14 14 14 14 14 14 Hardness range 2 (average

Hydraulic data Rated capacity l 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Rated capacity gal 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 Values Max. permissible inlet tem-

perature Max. permissible inlet tem-

perature ON l/min 1.2 1.2 1.6 1.6 1.6 1.8 2.6 3.0 3.0 ON GPM 0.32 0.32 0.43 0.43 0.43 0.48 0.69 0.8 0.8 Pressure drop at flow rate MPa 0.023 0.023 0.023 0.023 0.023 0.023 0.025 0.03 0.03 Pressure drop at flow rate PSI 2.88 2.88 2.88 2.88 2.88 2.88 3.13 3.75 3.75 Flow rate for pressure drop l/min 1.2 1.2 1.6 1.6 1.6 1.8 2.6 3.0 3.0 Flow rate for pressure drop GPM 0.32 0.32 0.43 0.43 0.43 0.48 0.69 0.8 0.8 DHW delivery l/min 1.2 1.2 1.6 1.6 1.6 1.8 2.6 3.0 3.0 DHW delivery GPM 0.32 0.32 0.43 0.43 0.43 0.48 0.69 0.8 0.8 Δϑ if presented K 36 30 34 40 43 48 30 43 34 Application limits Max. permissible pressure MPa 1 1 1 1 1 1 1 1 1 Max. permissible pressure PSI 150 150 150 150 150 150 150 150 150 Test pressure MPa 2 2 2 2 2 2 2 2 2 Test pressure PSI 300 300 300 300 300 300 300 300 300 Versions IP-Rating IP25 IP25 IP25 IP25 IP25 IP25 IP25 IP25 IP25 Material of the pressure vessel Copper Copper Copper Copper Copper Copper Copper Copper Copper Heating system Tubular

Cap and back panel Plastic Plastic Plastic Plastic Plastic Plastic Plastic Plastic Plastic Colour white white white white white white white white white Colour white white white white white white white white white Dimensions Height mm 360 360 360 360 360 360 360 360 360 Height in 14.17 14.17 14.17 14.17 14.17 14.17 14.17 14.17 14.17 Width mm 200 200 200 200 200 200 200 200 200 Width in 7.88 7.88 7.88 7.8 8 7.88 7.88 7.88 7.8 8 7.88 Depth mm 100 100 100 100 100 100 100 100 100 Depth in 4.33 4.33 4.33 4.33 4.33 4.33 4.33 4.33 4.33 Weights Weight kg 2.1 2.1 2.1 2.1 2.1 2.4 2.4 2.4 2.4 Weight lb 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6

234452

10 12 12 12 10 10 8 8 8

hardness)

°C 30 30 30 30 30 30 30 30 30

°F 86 86 86 86 86 86 86 86 86

heater

074052 074053 074051 074054 074424

2 (average

hardness)

Tubular

heater

2 (average

hardness)

Tubular

heater

2 (average

hardness)

Tubular

heater

2 (average

hardness)

Tubular

heater

2 (average

hardness)

234453

Tubular

heater

074055 234454

2 (average

hardness)

Tubular

heater

232204 074056

2 (average

hardness)

Tubular

heater

2 (average

hardness)

234455

Tubular

heater

ENGLISH

- Suitable for supply with cold water

- Tankless water heaters are considered a non-continuous load

- Conductors should be sized to maintain a voltage drop of less than 3 % under load

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INSTALLATION

TEMPERATURE INCREASE ABOVE AMBIENT WATER TEMPERATURE

10. Temperature increase above ambient water temperature

[ °F ]

Typ kW GPM (gallon per minute)

0.32 0.42 0.48 0.5 0.69 0.75 0.79 1.0 1.5 2.0 DHC 3-1 3.0 65 49 43 41 30 27 26 20 14 10 DHC 3-2

3.3 71 53 47 45 33 30 28 22 15 11 DHC 4-2

3.8 – 61 54 52 38 35 33 26 17 13 DHC 4-3 4.5 – 73 64 61 45 41 39 31 20 15 DHC 5-2

4.8 – 77 68 65 48 44 41 33 22 16 DHC 6-2

6.0 – – 85 82 60 55 52 41 27 20 DHC 8-2

7.2 – – – – 71 65 62 49 33 25 DHC 9-3 9.0 - - - - - - 77 58 41 31 DHC 10-2

9.6 – – - – – – 82 65 44 33

2.5 54 40 35 34 25 23 21 17 11 9

2.9 – 47 41 40 29 26 25 20 13 10

3.6 – 58 51 49 36 33 31 25 16 12

4.5 – – 64 61 45 41 39 31 20 15

5.4 – – – – 54 49 46 37 25 18

7.2 – – - – – – 62 49 33 25

Min. water ﬂow to activate unit

[ °C ]

Typ / Type kW l/min

1.2 1.6 1.8 2.0 2.6 3.0 4.0 5.0 7.5 DHC 3-1 DHC 3-2

3.3 39 30 26 24 18 16 12 9 6 DHC 4-2

3.8 – 34 30 27 21 18 14 11 7 DHC 4-3 DHC 5-2

4.8 – 43 38 34 26 23 17 14 9 DHC 6-2

6.0 – – 48 43 33 29 22 17 11 DHC 8-2

7. 2 – – – – 40 34 26 21 14 DHC 9-3 9.0 - - - - - 43 32 26 17 DHC 10-2

9.6 – – – – – 46 34 28 18

3.0 36 27 24 22 17 14 11 9 6

2.5 30 22 20 18 14 12 9 7 5

2.9 – 26 23 21 16 14 10 8 6

4.5 – 40 36 32 25 22 16 13 9

3.6 – 32 29 26 20 17 13 10 7

4.5 – – 36 32 25 22 16 13 9

5.4 – – – – 30 26 19 15 10

7.2 – – – – – 34 26 21 14

Min. water ﬂow to activate unit

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INSTALLATION

TROUBLESHOOTING

11. Troubleshooting

Symptom Possible cause Solution

No hot water but audible click can be heard when water is turned on safety thermal cut-out tripped reset thermal cut-out. No hot water and no audible click can be heard when

water is turned on

clean filter screen at DHC unit (see figure “Spare

Water not warm enough voltage too low supply correct voltage to unit.

If you are not able to resolve a problem please contact us toll free at 800-582-8423 before removing the unit from the wall. STIEBEL ELTRON is happy to provide technical assistance. In most instances, we can resolve the problem over the phone.

Open ﬂow adjustment screw

circuit breaker off circuit breaker on.

water flow too low to activate flow switch clean faucet aerator.

open shut-off valve completely. open flow adjustment screw.

parts”).

water flow too high reduce wter flow, close flow agjusment screw.

ENGLISH

Reset button from safety thermal cut out

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INSTALLATION

4

7

1

3

9

12

8

SPARE PARTS

12. Spare parts

No. Spare part DHC 3-1 DHC 3-2 DHC 4-2 DHC 4 -3 DHC 5-2 DHC 6-2 DHC 8-2 DHC 9 -3 DHC 10-2

1 Heating system 165889 167769 167770 165890 167771 171117 167772 296874 167773 2 Flow switch 165273 165273 162162 162162 162162 171105 162164 162465 162165 3 Thermostat 162472 162472 162472 162472 162472 162472 162472 162472 162472 4 Switch 168026 168026 168026 168026 168026 168026 168026 168026 168026 5 Housing (back) 165891 165891 165891 165891 165891 165891 165891 165891 165891 6 Plumbing connection 165893 165893 165893 165893 165893 165893 165893 165893 165893 7 Housing (front) 165892 165892 165892 165892 165892 165892 165892 165892 165892 8 Safety thermal cut out 162474 162474 162474 162474 162474 162474 162474 162474 162474 9 Wiring block 026010 026010 026010 026010 026010 026010 026010 026010 026010 10 Copper tube 162314 162314 162314 162314 162314 162314 162314 162314 162314 11 Module chassis 162462 162462 162462 162462 162462 162462 162462 162462 162462 12 Wire strain relief clamp 055754 055754 055754 055754 055754 055754 055754 055754 055754 13 Filter screen 252430 252430 252430 252430 252430 252430 252430 252430 252430

11

2

10

5

6

13

D0000043978

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STIEBEL ELTRON DHC10-2 User Manual [en, es, fr]