Electrical Connection; Technical Data; Putting The Water Heater Into Operation; Normal Maintenance - STIEBEL ELTRON DHC-E 20 Installation Instructions Manual

Electrical connection

WARNING: BEFORE BEGINNING
ANY WORK ON THE ELECTRIC
INSTALLATION, BE SURE THAT MAIN
BREAKER PANEL SWITCHES ARE "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
CIRCUITS SHOULD BE EQUIPPED WITH
A "GROUND FAULT INTERRUPTER".
1. All electrical work must comply with natio-
nal and applicable state and local electrical
codes.
2. The DHC-E should be connected to
properly grounded dedicated branch
circuits of proper voltage rating. Ground
must be brought to the "Ground" at the
circuit breaker panel. The DHC-E 20 and
DHC-E 30 must have multiple power
sources .
G
A DHC-E 20 requires two independant
circuits. Use two AGW # 8 supply cables
protected by two seperate double pole
50 Amp. breakers (see ).
1
A DHC-E 30 requires three independant 2
circuits. Use three AGW # 8 supply cables
3
protected by three seperate double pole
4
50 Amp. breakers.
5 1
In both cases, make sure that the unit is
properly grounded (see 6 2 ). Please refer
to the technical data table for the correct
7
3
wire and circuit breaker size.
8
4
9
5
10
6
11
7
12
8

Technical Data

13
9
14
10
Model
15
11
Phase
16
12
Voltage
17
13
Wattage
18
14
19
Max. amp. load
15
20
Min. required circuit breaker size
16
21
Required wire size
17
22
18
Min. water flow 23
19
to activate unit
24
Pressure loss in unit
20
21
Nominal water volume
22
Working pressure max.
23
Tested to pressure
24
Weight
Water connections
– Suitable for supply with water up to 107.6 °F / 42 °C
– Tankless water heaters are considered a non-continuous load
– Conductors should be sized to maintain a voltage drop of less than 3 % under load
3. The wire must be fed through the knock-
outs located between the hot and cold
water connections
must be connected to the slots on the ter-
minal block marked L and L. The ground
wire must be connected to slot marked
with the ground symbol.
4. Reinstall the cover with screws.
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 COVER MUST BE
INSTALLED BEFORE THE CIRCUIT
BREAKERS ARE TURNED ON.
1. Turn on circuit breakers to bring electrical
power to the unit.
2. Adjust the water temperature to the
desired level using the knob on the front
cover of the unit. The DHC-E displays the
temperature in degree Celsius. There is a
conversion table on the front cover that
helps to convert from degree Celsius to
degree Fahrenheit.
3. Turn on hot water and wait twenty
seconds until temperature has stabilized.
4. Check the water temperature with your
hand and make sure that it does not feel
too hot. Reduce if necessary.
DHC-E 20
1
V 208
kW 14.4
A 70
A 2 x 40
AWG COPPER 8
GPM / l/min
PSI / bar
GAL / l
PSI / bar
PSI / bar
lbs. / kg
NPT
. The "live" wires
F
DHC-E 30
1
220 - 240 208
19.2 21.6
80 105
2 x 50 3 x 40
8 8
0.58 / 2.2
1.45 / 0.1
0.26 / 1.0
150 / 10
300 / 20
21 / 9.5
3/4"
– 7 –
5. Explain to the user how the unit works
and familiarise him or her with its use.
Advise the user about possible hazards
(hot water temperature up to 125 °F /
52 °C). Hand over these instructions, to
be kept for future reference.

Normal maintenance

STIEBEL ELTRON DHC-E tankless water
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-E 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
cap of the filter screen . Clean screen
H
and put the screen and cap back into their
original position.
OTHER THAN THE FILTER SCREEN,
THE DHC-E DOES NOT
CONTAIN ANY PARTS SERVICEABLE BY
THE LAY PERSON. IN CASE OF
MALFUNCTION PLEASE CONTACT A
LICENSED PLUMBER OR ELECTRICIAN.
220 - 240
28.8
120
3 x 50
8
0.87 / 3.3
1.45 / 0.1
0.39 / 1.5
24.25 / 11