Instructions / Assembly

ENGLISH
WWW.STIEBEL-ELTRON.COM DHC | 5
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 out-
let 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 in-
dependent 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.
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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 „typical“ 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
mixer-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.