Heating Connection; Power Supply - Stiebel Eltron SB 300 E Mode D'emploi

INSTALLATION
Installation
DHW circulation
The heat losses incurred in the DHW circulation line and the elec-
trical power consumption of the circulation pump reduce the effi-
ciency of the system. The cooled water in the circulation line mixes
with the tank content. Where possible, avoid installing a DHW
circulation line. Where that is not possible, the DHW circulation
pump must be controlled thermally or by time switch.
Thermal insulation
Insulate the DHW line against heat loss in accordance with
locally applicable regulations.

10.2 Heating connection

The heating system can be configured in a variety of ways. The
methods described here are for the most common installation
method. For more questions on installation and configuration of
the heating system, contact Stiebel Eltron.
10.2.1 Connecting to the internal coil heat exchanger
The internal coil heat exchanger connections are 1˝ NPT female.
A common use of this coil is for closed-loop solar thermal appli-
cations, like in the below image.
Ball valve
Check valve
V T
Flow meter Temp. gauge
A few necessary features of this system include:
- Corrosion inhibiting propylene glycol
- Air separator/eliminator
- Circulation pump
www.stiebel-eltron-usa.com
To solar
From solar
T
V
Air separator
T&P valve
Expansion tank
Circulation pump
Pres. gauge
10.2.2 Connecting to the auxiliary ports
The auxiliary ports can be used to add another heating source,
or to supply heat stored in the tank to another location. If the
auxiliary ports are unused for heating, they can be used for a
DHW recirculation loop.
It is necessary for both sides of the heat exchanger to have circu-
lation pumps and air/dirt separators. A check valve is also recom-
mended to prevent thermosiphoning.
Consult your local plumbing code for requirements regarding heat
exchanger properties (double wall, brazed, stainless steel, etc.)

10.3 Power supply

WARNING
Carry out all electrical connection and installation work
in accordance with national and regional regulations.
If the appliance is permanently connected to the power supply,
ensure that the appliance can be separated from the power sup-
ply by an isolator that disconnects double terminal with at least
3 mm contact gap. Contactors, mains isolators or fuses can be
used for this.
Disconnect the appliance from the power supply before carrying
out work on the control panel. Prevent the power supply from
being switched on while you are working on the system.
Ensure the appliance is earthed according to locally applicable
requirements.
From aux.
heat source
To aux.
heat source
Air/dirt separator
Check valve
Circulation pump
Flat-plate HX
SB 300-400 E | 9