STIEBEL ELTRON Heat pumps, Technical Manual

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General information
naturally, all compact heat pumps
from stiebel eltron can be installed
in all new and existing heating
systems. in many cases, a mono-
mode operation is feasible, so that
no additional, conventional heating
system and associated additional
investment is required, even on
those few exceptionally cold days
of the year. when deciding on the
potential Part of this is of a heat
pump, the heat distribution system
too, and in particular the required
flow temperature, must be given due
consideration. Generally speaking,
low temperature and conventional
heating systems (radiators) can
be supplied by heat pumps. when
developing new systems, allow for
low temperature heating systems with
max. flow temperatures of +55 °C.
existing systems with conventional
heat distribution too can generally be
combined with heat pumps without
requiring major changes. Generally,
such heating systems are designed for
maximum flow temperature of 90 °C.
However, most are oversized making
substantially lower flow temperatures
sufficient on account of subsequently
installed thermal insulation of the
building.
Heat pumps not only provide
heating but also produce hot water
economically.
All stiebel eltron heating heat
pumps also generate domestic hot
water, e.g. with special accessories,
such as the compact installation
and DHw cylinders. the heat pump
manager provides the automatic
changeover between central heating
and DHw heating operation.
Matching solutions for every
application
For many years, stiebel eltron
has been producing heat pumps
for all applications. Part of this is
an extensive installation accessory
range, e.g. buffer cylinders, pressure
hoses and control equipment. these
enable an easy and consequently
cost-effective installation. in the
following, two examples of heat pump
installations are shown. naturally,
alternative installation options are
also feasible.
Design example 1
Water | water heat pump
Operating mode: mono-mode
Mono-mode operation is only feasible
in conjunction with a low temperature
heating system (maximum flow
tempe60 °C). At a specific
heat demand of 50 watt/m², suitable
heat pumps offer themselves from the
heating system sizes listed in the table
on page 11.
Important information:
 A water analysis is part of the first
design phase.

two results from that analysis are
relevant to the engineering of the
system: free chlorine and chloride.
iron and manganese content.
 Construct the heat pump system in
accordance with the regulations of
your local water board.
 the system can be installed
subject to the availability of
groundwater of adequate quantity
and quality.
Design example 2
Air | water heat pump without
additional boiler
the mono-energetic air | water heat
pump wPl from stiebel eltron. As
the description suggest, the heating
system requires no second form of
energy. this heat pump operates with
outside air temperatures down to –20
°C where the outside air provides the
heat source. between –5 °C and –20
°C, the heating water is additionally
heated by a small electric booster
heater integrated into the heat pump.
stiebel eltron offers the air | water
heat pump wPl in different versions,
from 10 to 30 kw heating output. this
produces adequate heating for small
to large houses with a living space of
up to approx. 500 m².
Installation information:
 the unrestricted air flow through
the inlet and discharge apertures
must be assured at all times.
 A thermal "short circuit" between
the inlet and discharge apertures
must be prevented. the direction
of the air flow should be in line
with the main wind direction,
where possible. An installation
in a corner is advisable when
selecting an internal installation.
Design the air ducts as directly and
as short as possible.
 Maintain as small a clearance as
possible between heat pump and
house to keep pipe runs short.
select the installation location so
that no noise pollution is caused,
even though these appliances are
extremely quiet.
 the heat pump by necessity
creates condensate that must be
drained off in a suitable manner.
For internal installations via a
drain, possibly with a condensate
pump.