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14
Installation
4. Installation
4.1 Boiler room requirements
Regarding the building specifications in respect of
boiler rooms and their ventilation and exhaust, the
current building supervisory office regulations specific
to the state or country are to be observed.
The UltraOil
®
can be operated either
dependent on
air from the boiler room, or
independent of
boiler
room air.
Not dependent upon boiler room air
As an appliance of type C
53x
or C
63x
the UltraOil
®
can
be installed to operate independent of boiler room
air, irrespective of size or ventilation of the room in
which it is installed.
We recommend it is installed in a separate room
in which, in accordance with pr. EN 15035, a small
amount of leakage of exhaust gas can be tolerated.
Not dependent upon boiler room air:
Ensure that there is an adequate fresh air supply
to the boiler room,
so that the amount of combustion air required for
operation of all the burners installed there can be
continuously replenished without hindrance and that
for the protection of operating personnel there is no
shortage of oxygen.
Binding values for the size of ventilation openings are
not generally specified in the relevant regulations; it is
merely required that no partial vacuum in excess of
3 N/m
2
occurs. To comply with this requirement, for
up to a nominal thermal output of 50 kW, a ventilation
cross-section of at least 300 cm
2
must be provided.
In rectangular openings, the ratio of sides should not
exceed 1.5:1; if a grid is fitted, an appropriate adjust-
ment must be allowed so that the free cross-section
area reaches the amount given above.
4.2 Flue connection and chimney
The exhaust system must be gastight,
water tight, resistant to acids and be
approved for the corresponding ex-
haust gas temperatures up to 120 °C
and for operation at pressure.
Horizontal connections must be laid
with a gradient down towards the boil-
er of at least 50 mm per meter length,
to ensure that there is no hindrance to
condensate flowing back into the boil-
er. The whole exhaust system must be
designed to avoid condensate collect-
ing.
As a general rule, only one heat generator
should be connected to the chimney. For two
heat generators, the corresponding regula ti-
ons are to be observed.
In the UltraOil
®
there is an exhaust gas safety
temperature limiter installed. For this reason,
no additional exhaust gas temperature limiter
is required for the exhaust gas system with a
maximum permitted exhaust gas temperature
of 120 °C.
Because of the moisture content in exhaust gases
at low temperatures and the additional condensate
which is thus caused in the chimney, it is not permit-
ted to connect oil condensing boilers to traditional
domestic chimneys.
The current official conditions and regulations are to
be observed in respect of the exhaust gas system
design.
There are two alternatives for exhaust gas system
design for oil condensing boilers:
a) the use of special exhaust gas systems approved
by the building authorities,
b) the use of moisture-resistant chimneys which are
approved for exhaust gas temperatures of over
40 °C, connected in the boiler installation room
by means of approved exhaust flues with the oil
condensing boiler.
In both cases, the cross-sections and maximum
lengths are to be calculated on the basis of the values
for exhaust gas mass flow, exhaust gas temperature
and the delivery pressure available at the exhaust
connections in accordance with the table in section
3.2 (DIN 4705).
