STIEBEL ELTRON DHC 3-1, DHC 3-2, DHC 4-2, DHC 4-3, DHC 5-2 Operation And Installation

...
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.
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CONTENTS | OPERATION
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.
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
Electrocution
Burns or scalding
1.1.3 Keywords
KEYWORD Description
DANGER If this information is not observed, it will result in serious
injury or death.
WARNING If this information is not observed, it can result in serious
injury or death.
CAUTION If this information is not observed, it can lead to medium
or minor injury.
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
Appliance disposal
This symbol indicates that you have to do something. The ac-
tion you need to take is described step by step.
2. Safety
Observe the following safety information and regulations. Operate the appliance only when fully installed and with all safety
equipment fitted.
OPERATION
GENERAL
ENGLISH
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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.
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INSTALLATION
MOUNTING THE UNIT
INSTALLATION
4. Mounting the unit
26�02�02�0330
7
6
1
4
3 2
8
5
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)
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.
26�02�02�1360
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.
26�02�02�033126�02�02�1355
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
EXCESSIVE HEAT FROM SOLDERING ON COPPER PIPES NEAR THE DHC MAY CAUSE DAMAGE.
ENGLISH
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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.
26�02�02�0469
DANGER Electrocution AS WITH ANY ELECTRIC APPLIANCE, FAILURE TO ELEC­TRICALLY GROUND UNIT MAY RESULT IN SERIOUS INJURY OR DEATH.
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.
Note
OTHER THAN THE FILTER SCREEN, THE DHC DOES NOT CONTAIN ANY PARTS SERVICEABLE BY THE LAY PERSON. IN CASE OF MALFUNCTION PLEASE CONTACT A LICENSED PLUMBER OR ELECTRICIAN.
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INSTALLATION
TECHNICAL DATA
9. Technical Data
b01
c06 c01
c01
c06
38 (1.5")
360 (14.17")
200 (7.88")
100 (3.94")
110 (4.33")
273 (10.75")75 (2.953")
8 (0.315")
D0000021558
b01 electrical supply cable c01 cold water connection " NPT 1/2 c06 hot water connection " NPT 1/2
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
LL
V
85�02�02�0008
DHC 6-2, DHC 8-2, DHC 10-2
A
2/GRD ~ 208 / 240 V
DHC 9 -3
A
2/GRD ~ 277 V
DHC 3-1
B
1/N/GRD ~ 120 V
V
LL
NL
85�02�02�0009
A
B
ENGLISH
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INSTALLATION
TECHNICAL DATA
9.2 Data table
DHC 3-1 DHC 3-2 DHC 4-2 DH C 4-3 DHC 5-2 DHC 6-2 DHC 8-2 DHC 9-3 DHC 10-2
074050
234452
074052 074053 074051 074054 074424
234453
074055 234454
232204 074056
234455 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
10 12 12 12 10 10 8 8 8
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
hardness)
2 (average
hardness)
2 (average
hardness)
2 (average
hardness)
2 (average
hardness)
2 (average
hardness)
2 (average
hardness)
2 (average
hardness)
2 (average
hardness) 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
°C 30 30 30 30 30 30 30 30 30
Max. permissible inlet tem­perature
°F 86 86 86 86 86 86 86 86 86
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
heater
Tubular
heater
Tubular
heater
Tubular
heater
Tubular
heater
Tubular
heater
Tubular
heater
Tubular
heater
Tubular
heater 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 7.88 7.88 7.88 7.88 7.88 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
- 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
2.5 54 40 35 34 25 23 21 17 11 9
3.3 71 53 47 45 33 30 28 22 15 11 DHC 4-2
2.9 – 47 41 40 29 26 25 20 13 10
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
3.6 – 58 51 49 36 33 31 25 16 12
4.8 – 77 68 65 48 44 41 33 22 16 DHC 6-2
4.5 – 64 61 45 41 39 31 20 15
6.0 – 85 82 60 55 52 41 27 20 DHC 8-2
5.4 – 54 49 46 37 25 18
7.2 71 65 62 49 33 25 DHC 9-3 9.0 - - - - - - 77 58 41 31 DHC 10-2
7.2 - 62 49 33 25
9.6 – - 82 65 44 33
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
3.0 36 27 24 22 17 14 11 9 6
DHC 3-2
2.5 30 22 20 18 14 12 9 7 5
3.3 39 30 26 24 18 16 12 9 6 DHC 4-2
2.9 26 23 21 16 14 10 8 6
3.8 34 30 27 21 18 14 11 7 DHC 4-3
4.5 40 36 32 25 22 16 13 9
DHC 5-2
3.6 32 29 26 20 17 13 10 7
4.8 43 38 34 26 23 17 14 9 DHC 6-2
4.5 36 32 25 22 16 13 9
6.0 48 43 33 29 22 17 11 DHC 8-2
5.4 30 26 19 15 10
7. 2 40 34 26 21 14 DHC 9-3 9.0 - - - - - 43 32 26 17 DHC 10-2
7.2 34 26 21 14
9.6 46 34 28 18
Min. water flow to activate unit
ENGLISH
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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
circuit breaker off circuit breaker 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
water flow too low to activate flow switch clean faucet aerator.
open shut-off valve completely. open flow adjustment screw.
clean filter screen at DHC unit (see figure “Spare
parts”).
Water not warm enough
water flow too high reduce wter flow, close flow agjusment screw.
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
26�02�02�1358
Reset button from safety thermal cut out
26�02�02�1357
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INSTALLATION
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
D0000043978
4
7
1
3
2
10
5
6
13
9
12
8
11
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