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

THIS MANUAL MUST BE READ CAREFULLY BEFORE ATTEMPTING TO INSTALL THE DHC-E
WATER HEATER. IF YOU DO NOT FOLLOW THE SAFETY RULES OR THE INSTRUCTIONS
OUTLINED IN THIS MANUAL, THE UNIT MAY NOT OPERATE PROPERLY AND IT COULD CAUSE
PROPERTY DAMAGE, SERIOUS BODILY INJURY AND/OR DEATH.
STIEBEL ELTRON, INC. WILL NOT BE LIABLE FOR ANY DAMAGES BECAUSE OF FAILURE TO
COMPLY WITH THE INSTALLATION AND OPERATING INSTRUCTIONS OUTLINED IN THIS
MANUAL OR BECAUSE OF IMPROPER USE. IMPROPER USE INCLUDES THE USE OF THIS
APPLIANCE TO HEAT ANY LIQUID OTHER THAN WATER. FAILURE TO COMPLY WITH
THE INSTALLATION AND OPERATING INSTRUCTIONS OR IMPROPER USE VOIDS WARRANTY.
NEVER REMOVE THE UNIT'S COVER UNLESS THE ELECTRICITY IS TURNED OFF.
IF YOU HAVE ANY QUESTIONS REGARDING THE INSTALLATION OR OPERATION OF THIS
WATER HEATER,
PLEASE CALL OUR TECHNICAL SERVICE LINE AT 800-582-8423 (USA AND CANADA ONLY).
IF YOU ARE CALLING FROM OUTSIDE THE U.S. OR CANADA, PLEASE CALL USA 413-538-7850
AND WE WILL REFER YOU TO A QUALIFIED STIEBEL ELTRON SERVICE REPRESENTATIVE IN
YOUR AREA.
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).
OR IF YOU NEED AN ADDITIONAL INSTALLATION MANUALS,
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.
Typical residential installation
C
1
1
2
Typical commercial installation
C
2
3
3

Mounting the unit

4
4
5
UNIT MUST BE INSTALLED IN A
5
VERTICAL POSITION WITH THE
6
6
WATER FITTINGS POINTING DOWN-
7
7
WARD. DO NOT INSTALL UNIT
8
8
WHERE IT WOULD ROUTINELY BE
9
SPLASHED WITH WATER. ELECTRIC
9
SHOCK MAY RESULT. 10
10
11
11
1. Install DHC-E as close as possible to the
12
main hot water draw-off points.
12
13
2. Install DHC-E in a frost free area. If frost
13
may occur, remove unit before freezing
14
14
temperatures set in.
15
15
3. Leave a minimum of 5" of clearance on all
16
sides for servicing.
16
17
4. Remove the cover
17
5. Mount unit securely to wall by putting four
18
18
screws through mounting holes
19
Screws and plastic wall anchors for 19
20
mounting on masonry or wood are
20
21
provided.
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22
22
23
.
D
.
E
– 6 –

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. 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.