4 Planning and installation – Connections
28
E
LECTRICAL
SYSTEM
The instructions in 2006/95/EC (low voltage directive) must be
followed for the electrical connections to the system. The electrical
connection must be made on a separate isolating unit.
✎
The required connection values are described in chapter “3 Mode
of operation”, section “3.3 Technical data”.
W
ATER
U
SING
AN
ACCUMULATOR
When calculating the thermal requirements of buildings, e.g.
according to DIN EN 12831 “Method for calculating the normal
heating load”, the lowest outside temperature of the relevant climate
zone (e.g. -15 °C) is used. These conditions only apply a few days per
year, thus, the thermal performance of the heating system is greater
than required on most days when heating is needed.
As the boiler for this system is rated for a nominal load, the use of an
accumulator is required.
The size of the accumulator must be adapted to the boiler type, the
type of wood and the building's heating requirements. In terms of 1.
BImSchV, the minimum capacity of the accumulator is 12 litres per
litre of fuel chamber capacity; however, the required 55 litres per kW
of nominal thermal power must be maintained.
S
AFETY
DEVICES
Safety devices (e.g. boiler safety module, insufficient water cutout,
etc.) must be installed in accordance with DIN EN 12828: 2003
“Design of water-based heating systems in buildings”.
R
ETURN
TEMPERATURE
CONTROL
Operating temperatures which are too low significantly shorten the
service life of the boiler. Water vapour contained in the flue gas could
be released in the form of condensation if the temperature drops
below the dew point (approx. 50 - 55 °C), especially in the area
Important!
The heating system must be filled with water in accordance with
VDI guideline 2035, “Avoiding damage in hot water heating
systems”.
Antifreeze agents may only be used after prior consultation with
HDG.
For the HDG F20/25/30 boiler, the minimum accumulator volume is
2000 litres and for the HDG F40/50 it is 3000 litres.
Important!
Please also observe DIN EN 303-5 as well as the individual comfort
requirements of the customer for the capacity of the accumulator.
Summary of Contents for F20
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