Stiebel Eltron 524201 Installation Manual
OPERATION AND INSTALLATION
UTILISATION ET INSTALLATION
TANKLESS ELECTRIC BOOSTER FOR TANK WATER HEATERS
AMPLIFICATEUR ÉLECTRIQUE SANS RÉSERVOIR POUR CHAUFFE-EAU À RÉSERVOIR
»MEGABOOST
Tankless electric booster
for tank water heaters
°
F
Max. power, below set temp.
Modulating power
Off
86°F - 105°F Hand Washing
105°F - 120°F Residential Use
120°F - 140°F Commercial Only
°
C
Conforms to ANSI/UL Std. 499
Certified to CAN/CSA Std. E335-1 & E335-2-35
Certifié à la norme ANSI/UL 499
Conforme à la norme CAN/CSA E335-1 & E335-2-35
Tested and certified by WQA to NSF/ANSI372
for lead free compliance.
Testé et certifié par WQA contre NSF/ANSI 372
pour une utilisation sans plomb.
CONTENTS | OPERATION
OPERATION
1. General information ___________________________________________ 2
1.1 Safety information __________________________________________________ 2
1.2 Other symbols in this document _________________________________ 2
2. Safety ____________________________________________________________ 3
2.1 Intended use _________________________________________________________ 3
2.2 General Information________________________________________________ 3
2.3 Safety Precautions __________________________________________________ 3
3. Register your product _________________________________________ 3
4. General __________________________________________________________ 4
5. Troubleshooting ________________________________________________ 4
INSTALLATION
6. Safety ____________________________________________________________ 5
6.1 General safety instructions _______________________________________ 5
7. Appliance description _________________________________________ 5
7.1 Standard delivery ___________________________________________________ 5
8. Mounting the appliance _______________________________________ 5
8.1 Application ___________________________________________________________ 5
8.2 Choosing installation configuration _____________________________ 5
8.3 Typical installation configurations ______________________________ 5
8.4 Mounting _____________________________________________________________ 6
9. Water connections _____________________________________________ 6
10. Electrical connection ___________________________________________ 6
10.1 Temperature setting/anti-scalding protection _______________ 7
10.2 Terminal block _______________________________________________________ 7
11. Commissioning _________________________________________________ 8
11.1 Appliance handover ________________________________________________ 8
12. Troubleshooting ________________________________________________ 8
12.1 Display options LED diagnostic „traffic lights“ ________________ 8
12.2 Fault table ____________________________________________________________ 8
12.3 Resetting the safety thermal cutout ____________________________ 8
13. Normal maintenance ___________________________________________ 9
14. Technical data __________________________________________________ 9
14.1 Dimensions ___________________________________________________________ 9
14.2 Wiring diagram ____________________________________________________10
14.3 Data table ___________________________________________________________10
14.4 Spare parts__________________________________________________________10
15. Limited warranty ______________________________________________11
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.
1.1 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.
f Steps to prevent the risk are listed.
1.1.2 Symbols. type of risk
Symbol Type of risk
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.
Electrocution
Burns or scalding
f Read these notes carefully.
Symbol
!
f This symbol indicates that you have to do something. The ac-
tion you need to take is described step by step.
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Damage to the appliance and environment
Appliance disposal
OPERATION
SAFETY
2. Safety
Observe the following safety information and regulations.
Operate the appliance only when fully installed and with all safety
equipment fitted.
2.1 Intended use
The appliance is intended to boost domestic hot water output of a
tank water heater.
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
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.
DANGER: Electrocution
Never remove the appliance 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. A hot water scalding potential exists if the thermostat on the appliance is
set too high. Households with small children, disabled or
elderly persons may require that the thermostat be set at
113°F (45°C) or lower to prevent possible injury from hot
water.
WARNING: Injury
!
Where children or persons with limited physical, sensory
or mental capabilities are to be allowed to control this
appliance, ensure that this will only happen under supervision or after appropriate instructions by a person responsible for their safety.
Children should be supervised to ensure that they never
play with the appliance.
ENGLISH
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 serious
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.
3. Register your product
YOU MUST REGISTER THIS PRODUCT WITHIN 90 DAYS OF PURCHASE
ON OUR WEB SITE IN ORDER TO ACTIVATE THE STANDARD
WARRANTY OR TO BE ELIGIBLE FOR THE EXTENDED WARRANTY. GO TO OUR
WEB SITE AT WWW.STIEBEL-ELTRON-USA.COM AND CLICK ON REGISTER
YOUR PRODUCT.
Before beginning the registration process, we suggest that you
gather the necessary information which will be as follows:
Number listed after “Nr.”
Place of Purchase
Purchase Date
First & Last Name
Email address
Physical Address
Phone Number
Installation Date
IF YOU HAVE ANY QUESTIONS CONCERNING THE REGISTRATION
PROCESS OR WARRANTY OPTIONS, PLEASE CONTACT STIEBEL
ELTRON USA DIRECTLY AT (800)-582-8423.
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OPERATION
GENERAL
4. General
The 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 appliance.
Due to the absence of stand-by losses, the appliance offers greater
energy efficiency than storage type water heaters.
The MegaBoost should be installed in conjunction with a storage
tank water heater.
MegaBoost can be installed on the cold water inlet or on the hot
water outlet of the tank water heater. Installation at either location
will greatly increase the amount of hot water the tank is able to deliver (first hour rating). Either installation location will also shorten
the recovery time necessary for the tank to recharge, but this effect
is far greater with installation on the cold water inlet.
°
F
°
C
5. Troubleshooting
Symptom Possible Cause Solution
No hot water not enough flow rate
to activate appliance
Water not hot
enough
If you cannot remedy the fault, notify the contractor who installed
the appliance. To facilitate and speed up your enquiry, please provide the serial number from the type plate (000000-0000-000000).
water flow too high reduce water flow rate until light on
clean faucet aerator or shower head
front cover stops blinking
The input of heat into the water is electronically controlled. The
appliance will deliver any water temperature between 86°F (30°C)
and 140°F (60°C). Please set the desired temperature using the knob
on the front cover.
Note:
For reasons of appliance efficiency and durability (scaling),
the optimum temperature setting lies between 86°F (30°C)
and 120°F (50°C).
In case the “Power” light is flashing while the appliance operates,
the water flow rate exceeds the heating capacity of the appliance.
Reduce the hot water flow rate in order to let the appliance achieve
the set point temperature. The maximum temperature is electronically limited to 140°F (60°C). In case you have questions regarding
the way you plan to use the appliance, please call our technical
service line, see last side.
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INSTALLATION
SAFETY
INSTALLATION
6. Safety
Only a qualified contractor should carry out the installation, commissioning, maintenance and repair of the appliance.
6.1 General safety instructions
To ensure your warranty remains valid, use only original accessories
and spare parts. If you need spare parts, call 800-582-8423.
7. Appliance description
The heating element is located inside a copper canister in the plastic
housing. The incoming water enters the unit on the bottom right,
and exits at the bottom left. There is a temperature selection knob
on the front face of the unit.
7.1 Standard delivery
The following are delivered with the appliance:
- ½˝ to ¾˝ couplings
8. Mounting the appliance
MegaBoost
plus 30 Gal. Tank
on cold inlet
82 gal.
17.5 min.
Available Hot Water
More gallons is better
Recovery Time
Shorter time is better
30 Gal. Tank
alone
48 gal.
85 min.
MegaBoost
plus 30 Gal. Tank
on hot outlet
74 gal.
35.5 min.
8.3 Typical installation configurations
MegaBoost installation on cold water inlet of tank.
4
ENGLISH
8.1 Application
One appliance can be used for the following applications:
Pre-heating water entering a tank water heater
Heating water exiting a tank water heater
CAUTION: Electrocution
Unit must be installed in a vertical position with the water
fittings pointing downward. In this position the unit is
splash proof, so that no water can soak in.
8.2 Choosing installation configuration
The Megaboost can either pre-heat an electric tank water heater or
be pre-heated by one.
The chart shows the effect of installation on the tank cold water inlet
versus on the tank hot water outlet. These results are a guideline
only as results will vary with installation of different size tanks, with
different hot water tank settings, and in locations with different cold
water inlet temperatures.
2
MegaBoost installation on hot water outlet of tank.
1
4
1 MegaBoost
2 Electric water heater
3 Cold water inlet
4 Hot water outlet
1
3
3
2
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INSTALLATION
WATER CONNECTIONS
8.4 Mounting
f Securely install the appliance in a location affording easy pip-
ing to the hot water tank.
f Install appliance in a frost free area. If frost may occur, remove
appliance before freezing temperatures set in.
f Leave a minimum of 5” of clearance on all sides for servicing.
f Remove plastic cover.
f Screw the screws into the wall and hang the appliance. Screws
and plastic wall anchors for mounting on masonry or wood are
provided.
f Secure the screws.
9. Water connections
Damage to the appliance and the environment:
!
Excessive heat from soldering on copper pipes near the
MegaBoost may cause damage.
f All plumbing work must comply with national and applicable
state and local plumbing codes.
f A pressure reducing valve must be installed if the cold water
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supply pressure exceeds 150 PSI (10 bar).
f Make certain that the cold water supply line has been flushed
to remove any scale and dirt.
f Install isolating valve in cold water line as shown in 8.3, “Typi-
cal installation configurations”, pg. 5. This allows the appliance to be isolated for maintenance purposes. The tank water
heater should have its own isolation valve in addition to the
valve for the MegaBoost.
f Cold water connection (inlet) is on the right side of the ap-
pliance, hot water connection (outlet) is on the left side of
appliance.
f Tankless water heaters such as the MegaBoost are not required
to be equipped with a Pressure and Temperature Relief Valve
(P&T). If the local inspector will not pass the installation without a P&T, it should be installed on the hot water outlet side of
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appliance.
f The appliance is designed for connection to copper tubing, PEX
tubing or a braided stainless steel hose with a ½“ NPT female
tapered thread. If soldering near the appliance is necessary,
please direct the flame away from the plastic housing of the
appliance in order to avoid damage. Two couplings that adapts
½˝ to ¾˝ NPT are included with the MegaBoost.
f When all plumbing work is completed, check for leaks and take
corrective action before proceeding.
10. Electrical connection
DANGER: Electrocution
Carry out all electrical connection and installation work in
accordance with relevant regulations.
DANGER: Electrocution
Only use a permanent connection to the power supply. The
appliance must be able to be separated from the power
supply by an isolator that disconnects all poles with at least
3mm contact separation.
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INSTALLATION
ELECTRICAL CONNECTION
Damage to the appliance and the environment:
!
Observe the type plate. The specified voltage must match
the mains voltage.
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“.
DANGER: Electrocution
As with any electric appliance. failure to electrically ground
appliance may result in serious injury or death.
f The appliance should be connected to a properly grounded
dedicated branch circuit of proper voltage rating. In installations with several appliances, each appliance requires an independent circuit. Please refer to the technical data table for the
correct wire and circuit breaker size.
10.1 Temperature setting/anti-scalding protection
ENGLISH
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f Connect the lead of the electronic temperature control to posi-
tion „A1“ in order to get the maximum outlet temperature of
140°F (60°C).
The maximum temperature can be limited to 109°F (43°C):
f Connect the lead of the electronic temperature control to posi-
tion “A2”.
f Reinstall the plastic cover.
10.2 Terminal block
Consult the chart below for the recommended torque amounts on
the terminal block screws.
4˝ (100 mm)
f The wire must be fed through the rubber seal located be-
tween 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 L and L. The ground wire must be connected to
slot marked with the ground symbol. Strain relief clamp with
screws and rubber seal are provided.
Screw Size (mm) Min. Torque (N•cm) Min. Torque (lbf•in)
M6 200-250 17.7-22.1
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Using the proper torque specifications to secure wire to the wiring
block helps to avoid personal loss or property damage.
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INSTALLATION
COMMISSIONING
11. Commissioning
DANGER: Electrocution
Commissioning must only be carried out by an authorised
contractor in accordance with safety regulations.
Damage to the appliance and the environment:
!
Open hot water faucet for a few minutes until water flow
is continuous and all air is purged from water pipes. The
appliance’s plastic cover must be installed before the circuit
breaker is turned on.
f Turn on circuit breaker to bring electrical power to the
appliance.
1 LED diagnostic “traffic lights“
1
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f Turn the temperature selector clockwise and anti-clockwise, to
calibrate the temperature selector.
f Adjust the water temperature to the desired level using the
knob on the front cover of the appliance.
f Turn on hot water and wait twenty seconds until temperature
has stabilized.
f Check the water temperature with your hand and make sure
that it does not feel too hot. Reduce temperature if this is
necessary.
f Explain to the user how the appliance works and familiarise
him or her with its use.
f Advise the user about possible hazards (hot water temperature
up to 140°F (60°C). Hand over these instructions, to be kept
for future reference.
f A setting of 110°F (43°C) is recommended when the MegaBoost
is installed on the outlet of the tank. When installed on the tank
inlet, a setting of 120°F (49°C) is recommended.
11.1 Appliance handover
Explain the functions of the appliance to the user. Draw special attention to the safety information. Hand the operating and installation
instructions to the user.
12. Troubleshooting
12.2 Fault table
Symptom Possible Cause Solution
No hot water
clean faucet aerator or shower
Not enough hot water filter screen clogged clean filter screen at appliance
Water not hot enough water flow too high
supply correct voltage to ap-
f If you are not able to resolve a problem please contact us, see
last side, before removing the appliance from the wall. STIEBEL
ELTRON is happy to provide technical assistance. In most instances, we can resolve the problem over the phone.
circuit breaker off
safety thermal cut-out
tripped
not enough flow rate to
activate appliance
turn circuit breaker on
reset thermal cut-out
clean filter screen at appliance
head
reduce water flow rate until
light on front cover stops blinking
pliance
12.3 Resetting the safety thermal cutout
DANGER: Electrocution
Do not attempt to reset the safety thermal cutout of
this water heater unless power to the unit has been
completely shut off at the circuit breakers.
DANGER: Electrocution
To test the appliance, it must be supplied with power.
12.1 Display options LED diagnostic „traffic lights“
Display options
red illuminates in case of faults
yellow illuminates when the appliance is heating water
green flashing: The appliance is supplied with power
The safety thermal cutout on the DHC-E is designed to cut off electrical power to the heating elements if water of too high a temperature
8 | MEGABOOST WWW.STIEBEL-ELTRON-USA.COM
Safety
thermal
cutout
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