General; Mounting The Unit; Water Connections - STIEBEL ELTRON DHC-E 20 Installation Instructions Manual

Legend to figures
1 Temperature adjustment knob
2 Temperature display
3 "Power" light
4 Hot water connection
5 Cold water connection
6 Wiring block
7 Electronic control unit
8 Safety thermal cut out
9 Heating system
10 Knock-outs for wires
11 Water supply line for faucet
installation
12 Sink
13 Cold valve (right)
14 Hot valve (left)
15 Screws and plastic wall
anchors

General

The DHC-E 20 and DHC-E 30 are
designed to supply hot water for a
house or apartment. Unlike a
conventional storage type water
heater the DHC-E tankless water
heater does not store hot water.
Instead, water is heated
instantaneously as it flows
through the unit. Due to the
absence of stand-by losses, the
DHC-E offers greater energy
efficiency than storage type water
heaters.
The input of heat into the water is
controlled electronically. The
DHC-E will deliver any water
temperature between 86 ºF (30
ºC) and 125 ºF (52 ºC). Please
set the desired temperature using
the knob on the front cover. The
LED displays the temperature
that the unit will produce in ° C.
Please use the conversion table
on the unit in order to obtain
degree Fahrenheit. The maximum
temperature is electronically
limited to 125 ° F (52 ° C).
In case the "Power" light is
flashing while the unit operates,
the water flow rate exceeds
the heating capacity of the unit.
Reduce the hot water flow rate in
order to let the unit achieve the
set point temperature. In case you
have questions regarding the way
you plan to use the DHC-E,
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 413-538-7850. You
can also e-mail us at
info@stiebel-eltron-usa.com or
fax us at USA 413-538-8555.
One DHC-E can be used for the
following applications.
(C)1
Typical residential
installation
(C)2
Typical commercial
installation

Mounting the unit

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-E as close as
possible to the main hot water
draw-off points.
2. Install DHC-E 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.
D)
4. Remove the cover (
5. Mount unit securely to wall by
putting four screws through
E)
mounting holes ( .
Screws and plastic wall anchors
for mounting on masonry or wood
are provided.

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. An isolating valve is an integral
part of the cold water inlet. This
valve allows the unit to be isolated
for maintenance purposes.
5. The cold water connection
(inlet) is on the right side of the
unit, and the hot water
connection (outlet) is on the left
side of the unit.
NOTE: EXCESSIVE HEAT
FROM SOLDERING ON
COPPER PIPES NEAR THE
DHC-E MAY CAUSE DAMAGE.
6. Tankless water heaters such as
the DHC-E 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 the unit.
7. The DHC-E is designed for
connection to copper tubing, PEX
tubing or a braided stainless steel
hose with a 3/4. NPT female
tapered thread. If soldering near
the unit is necessary, please
direct the flame away from the
housing of the unit in order to
avoid damage.
8. When all plumbing work is
completed, check for leaks and
take corrective action before
proceeding.
.