Safety temperatures
These boilers comply with EN 303 and DIN 4702. They are CE-des-
ignated and suitable for use in sealed heating systems according to
EN 12828.
■ Permissible flow temperatures (= safety temperatures):
Up to 110 °C
■ Max. possible flow temperature:
Approx. 15 K below the safety temperature
■ High limit safety cut-out of the boiler control unit:
Delivered condition 110 °C
Can be changed to 100 °C
7.2 Delivery
The system is delivered to site. The system is unloaded on site.
The personnel carrying out transportation must be aware of accident
hazards and take appropriate measures to prevent them. The boiler
should only be lifted when it is completely empty (water, fuel, ash).
7.3 Siting
Boiler room requirements
A separate dry boiler room must be provided for the system. No com-
bustible materials may be stored in the boiler room. The solid fuel boiler
may only be installed on a fire- and temperature-resistant floor. No
temperature-sensitive pipes or lines may be routed through the floor
underneath the boiler. The load bearing capacity of the boiler room
floor must be designed for the system weight plus that of the water and
the fuel it will contain. Floor load bearing capacity in the area of the
boiler supporting surface: 1800 kg/m².
The minimum clearances to the walls and ceiling required for cleaning
and maintenance must be observed. These can be found on the
dimensions sheet. An adequate supply of fresh air must be ensured
directly from outdoors into the boiler room. Forced ventilation is
required in the case of narrow and/or internal boiler rooms. The tem-
perature in the boiler room when operating the system must not exceed
+40 °C (point of capture: approx. 1 m from the boiler). The temperature
in the boiler room when operating the system must not fall below
+10 °C (point of capture: inside of exterior wall).
■ Avoid air contamination by halogenated hydrocarbons (e.g. as in
sprays, paints, solvents and cleaning agents)
■ Prevent very dusty conditions
■ Prevent high levels of humidity
■ Prevent frost and ensure good ventilation
In rooms where
air contamination by halogenated hydrocarbons
can occur, install the boilers and flue gas/water heat exchangers only
if adequate measures can be taken to provide a supply of uncontami-
nated combustion air.
Failure to observe these instructions invalidates the warranty for any
losses related to any of these causes.
If in doubt, please contact us.
Combustion air supply
The combustion air supply is deemed to have been verified for open
flue combustion equipment with a total rated heating output in excess
of 35 kW. This applies if the combustion equipment is sited in rooms
with an aperture or line leading outdoors.
At 35 kW rated heating output, the cross-section of the aperture must
be at least 150 cm
2
. For every kilowatt rated heating output in excess
of 35 kW, the aperture must be 2 cm
2
larger than stated above.
Pipes must be sized to provide equivalent flow rates. The required
cross-section may be split over up to 2 apertures or pipes.
A
A = 150 cm² + 2 kW
cm² x (Σ
²
n – 35 kW)
Σ
²
n
= sum of all rated heating outputs in kW
Never close or obstruct combustion air apertures and lines. Use spe-
cial safety measures to ensure that the combustion equipment can
only be operated when the aperture is open.
The required cross-section must not be blocked by any closure or
grille.
Safety precautions
For gas combustion equipment, fuel lines
must
be equipped with the
following safety equipment immediately upstream of the gas combus-
tion equipment:
Design information
(cont.)
VITOLIGNO 300-H
VIESMANN
51
5672 507 GB
7
