Water Heater Description; Recommended Settings; Cleaning, Care And Maintenance; Troubleshooting - Stiebel Eltron DHC 3/3.5-1 Trend Utilisation Et Installation

OPERATION

Water heater description

Installation Date
If you have any questions concerning the registration pro-
cess or warranty, please contact Stiebel Eltron USA directly at
800.582.8423.
4. Water heater description
The water heater switches on automatically as soon as a hot water
valve at the tap is opened. When you close the tap, the water heater
switches off automatically.
From the activation flow rate, the control unit regulates the correct
heating output, subject to the temperature selected internally via
jumper by a contractor during installation, and the current cold
incoming water temperature.
If the water heater is operated with preheated water and the inlet
temperature exceeds the chosen set temperature, the water is not
heated further.
Fixed Domestic Hot Water (DHW) temperature
The water heater heats water as it flows through the unit.
The fixed DHW outlet temperature can be adjusted by a contractor
via jumper during installation. The factory default value is 100 °F
(38 °C). Other selectable values include: 110 °F (43 °C), 122 °F (50 °C),
140 °F (60 °C).
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.
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.
4.1

Recommended settings

The DHC Trend electric tankless water heater offers maximum conve-
nience and accuracy when providing DHW. If you do need to operate
the water heater with a thermostatic valve, we recommend adjusting
the required set temperature on the thermostatic valve.
www.stiebel-eltron-usa.com
4.1.1 Following an interruption to the water supply
Material losses
!
To ensure that the direct coil heating system is not damaged
following an interruption to the water supply, the water
heater must be restarted by taking the following steps.
Disconnect the water heater from the power supply by
turning off the connected circuit breaker.
Open and close all connected draw-off valves at least 5
times, for at least 3 minutes total, until all air has been
purged from the pipework and the water heater.
Switch the power back at the circuit breaker back ON.
5.

Cleaning, care and maintenance

Never use abrasive or corrosive cleaning agents. A damp cloth
is sufficient for cleaning the water heater.
Check the taps regularly. Limescale deposits at the tap outlets
can be removed using commercially available descaling agents.
6.

Troubleshooting

Problem
The water heater will not
start despite the faucet
being fully open
™
heating
When hot water is being
drawn off, cold water
flows for a short period
If you cannot solve the problem, contact your qualified contractor.
To facilitate and speed up your inquiry, please provide the serial
number from the type plate (000000-0000-000000). For live technical
assistance, please contact us at 800.582.8423. Alternatively, you may
email us at info@stiebel-eltron-usa.com
Cause Solution
There is no power Check to ensure circuit
breaker in breaker panel
hasn't tripped. Reset if
necessary
The white AE3 safety
switch has not been
engaged during initial
startup. Activate if neces-
sary (See section 11.3.1,
"Initial AE3 safety switch
activation," pg. 13). If
the AE3 switch has tripped
after initial installation,
contact a qualified con-
tractor to fix the cause
The aerator in the tap or Clean and/or descale the
the shower head is scaled aerator or shower head
up or dirty
The water supply has Vent the water heater and
been interrupted the cold water inlet line
The air detector detects The water heater restarts
air in the water. It switch- automatically after 1 min-
es off the heating output ute
briefly
Nr.: 000000-0000-00000
DHC Trend | 7