Mounting The Unit; Water Connections; Electrical Connection; Putting The Water Heater Into Operation - Stiebel Eltron DHC 3-1 Instructions D'installation

Mounting the unit

UNIT MUST BE INSTALLED IN A
VERTICAL POSITION WITH THE
WATER FITTINGS POINTING DOWN-
WARD. 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. 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.

Water connections

1. All plumbing work must comply with na-
tional 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 -13. 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.
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.

Electrical connection

WARNING: 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 na-
tional 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
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.
WARNING: AS WITH ANY
ELECTRIC APPLIANCE, FAILURE
TO ELECTRICALLY GROUND UNIT
MAY RESULT IN SERIOUS INJURY OR
DEATH.
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
– 7 –
(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
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.

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
. Then feed wires
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
water supply tube counterclockwise 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.
CONTAIN ANY PARTS SERVICEABLE BY
THE LAY PERSON. IN CASE OF
MALFUNCTION PLEASE CONTACT A
LICENSED PLUMBER OR ELECTRICIAN.
refer to the water
. Twist cold
OTHER THAN THE FILTER
SCREEN, THE DHC DOES NOT