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Design information
Minimum pressure limiter
Recommended for flow temperatures in excess of 100 ºC. One
required per multi boiler system.
Safety valve
Equip the boilers to EN 12828 with a type-tested safety valve. For all
other operating conditions, this must be identified in accordance with
TRD 721 with "D/G/H":
Expansion vessel
For boilers above 300 kW, install an expansion vessel with blow-off
and drain line near the safety valve. In order to prevent a risk caused
by escaping steam, the blow-off line must be routed to the outside.
The blow-off line on the safety valve should be constructed so as to
prevent the possibility of increases in pressure. Arrange the outlet of
the drain line so that any water expelled by the safety valve can be
safely observed and drained off.
6.8 Fire protection
The fire safety regulations for wood combustion systems vary depend-
ing on the country.
Fire protection, fuel store
The measures necessary for this are not part of the standard delivery
from KÖB Holzheizsysteme GmbH.
6.9 Commissioning
Initial commissioning of a newly installed system may only be carried
out by KÖB Holzheizsyteme GmbH or another contractor trained and
authorised by KÖB. Prior to commissioning, the system must be filled
with water, fuel must be stored for the commissioning and the instal-
lation must be monitored.
Fuel for commissioning
As the boiler system is cold and residual moisture is also extracted
from the refractory concrete during commissioning, the fuel for com-
missioning must be at least air dry. The heat-up process should be
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carried out in the first three hours with low output. In order to check the
function of the silo discharge system, not too much fuel should be
stored so that, in the event of a fault, the discharge system can be
quickly released to remedy the cause. For commissioning, dry fuel with
a max. water content of 20 % (W20) should be stored. The quantity
corresponds to consumption of approx. 10 – 24 full operating hours.
Rated output
390 kW
530 kW
720 kW
950 kW
1250 kW
Filling the heating system
Usually, the system is initially filled with raw water without chemical
treatment. This must be filtered and be free of suspended solids. Par-
ticular attention should be paid to careful ventilation during filling. In
the case of difficult water conditions (high hardness, etc.) and/or large
water volumes, VDI directive 2035 "Prevention of damage through
corrosion and scaling in hot water heating systems" must be observed.
Measures recommended by the directive for water treatment should
be carried out.
42
(cont.)
The pipework between the boiler and the safety valve must not be able
to be shut off. Pumps, fittings or restrictions must not be present in this
pipework.
Replacement, expansion vessel
An additional expansion vessel and blow-off line are not required if a
second high limit safety cut-out and a second maximum pressure lim-
iter are installed.
The regulations valid for the relevant installation location must be
observed.
Note
In this regard, the conditions of the local planning office must be fulfilled
by the operator.
Note
The fill pressure of the cold hydraulic seal should be approx. 0.1 bar
higher than the pre-charge pressure of the sealed expansion vessel.
However, it must not exceed a maximum of 3 bar.
Quantity of the fuel to be stored
approx. 2500 kg
approx. 3000 kg
approx. 4000 kg
approx. 5300 kg
approx. 6800 kg
PYROTEC
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