Water Heater Description; Settings And Displays; Dhc-E Trend User Interface - STIEBEL ELTRON DHC-E 3/3.5-1 Trend Operation And Installation Manual

OPERATION

Water heater description

4. Water heater description
The water heater switches on automatically as soon as a hot water
valve at a tap or other draw-off point is opened. DHC-E heats water
as it flows through the unit. When the tap is closed, the water heater
switches off automatically.
From the activation flow rate, the electronic control unit regulates
the correct heating output using only the minimum amount of power
necessary, subject to the temperature selected and the current in-
coming cold water temperature.
DHC-E Trend and DHC-E Plus are electronically controlled tankless
water heaters, and maintain a consistent outlet temperature. This
is irrespective of the inlet water temperature, up to the maximum
output of the water heater.
DHC-E Plus models feature Advanced Flow Control
patented by Stiebel Eltron in Germany (patent no. DE 3805441 C2).
When the maximum output of a DHC-E Plus model is met, rather
than deviate from the setpoint temperature and deliver cooler water,
DHC-E Plus models use an electronically-controlled motorized valve
to slightly reduce the flow of water only as much as is necessary
to maintain the user-selected temperature. When the demand can
again be fully met, the motorized valve returns to the completely
open position, allowing the full flow rate. This ensures uninterrupted
comfort, and hot water delivered at the desired temperature at all
times.
If the water heater is operated with preheated water, and the inlet
temperature exceeds the selected set temperature, the inlet tem-
perature will be displayed on the second row of the screen (DHC-E
Plus models only) and will flash. The water is not heated further.
DHC-E models are equipped with functions to permanently limit the
temperature (childproofing).
The backlight of the display switches on automatically as soon as
water flows through the unit, or if a change is made at the user
interface. The backlight switches off automatically if no changes are
made for 30 seconds, or 5 seconds after hot water stops being drawn.
DHC-E models allow the user to save different preset temperatures
and apply them quickly.
DHC-E Plus models also offer a more in-depth 2-row display with
enhanced functions. The DHC-E Trend has a single-row display and
a more basic user feature set.
Domestic Hot Water (DHW) temperature
The DHW outlet temperature can be variably adjusted from 68–140 °F
(20–60 °C). The selected temperature is displayed.
Heating system
™
The Direct Coil heating system is comprised of a pressure-tested,
glass-reinforced polyamide heating chamber with a nichrome wire
direct heating coil. It is suitable for hard and soft water areas and
is largely insusceptible to scale build-up. The Direct Coil
system ensures rapid and efficient DHW production.
www.stiebel-eltron-usa.com
Note
The water heater is equipped with an air detector that
largely prevents damage to the heating system. If, during
operation, air is drawn into the water heater, the water
heater shuts down the heating output for one minute to
protect the heating system.
5.

Settings and displays

5.1

DHC-E Trend user interface

™
, a technology
1 Backlit display
2 Temperature memory keys
3 Operating LED (flashes when output limit is reached)
4 Control knob
5 Main display | info display | parameter display
6 Segment display [10–100%]
7 "T " button
max
5.1.1 DHC-E Trend display overview
1
2
1 Digit display
™
heating
2 Power capacity status
3 T indicator
max
4 Temperature unit indicator
5 Display-lock indicator
1
2
3
4
3
DHC-E Trend & DHC-E Plus |
5
6
7
5
4
7