11
in the diagram, and should be set to close the primary air admission door when the
temperature reaches 80°C
–
for an optimal performance of any of the appliances
mentioned in this manual, the installation of the combustion auto-regulator is
required
.
*
If the room where the unit is installed or the transfer fluid piping presents the risk of
reaching a freezing temperature, the installer must add anti-freezing fluid in the
proportion recommended by the manufacturer to prevent freezing at the minimum
absolute temperature expected.
*
Before turning on the boiler, make sure the hydraulic circuit is filled with fluid and in
full operation.
*
It is critical to be able to access the different components of the hydraulic
installation throughout the life span of the unit, to facilitate periodic maintenance,
assistance and replacement operations of the required parts over time.
7.1
Calculting the minimum volume for the inertia deposit
Pursuant to the EN-303-5:2012 standard, the calculation of the minimum volume for
the inertia deposit is based on the following formula:
VSP = 15*TB*QN*(1-0,3*QH/Qmin)
where:
VSP = inertia deposit minimum volume (l)
TB= combustion time (h)
QN= rated power (kW)
QH= installation requirement (kW)
Qmin= minimum power for the boiler (kW)
Inertia deposit example:
Combustion time: 2 h (time required for the combustion of a firewood load)
Boiler's rated power: 32 kW
Boiler's minimum power: 32 kW
Building's heat load: 25 kW
Minimum volume required =15*2*32*(1-
0,3*25/32) ≈ 735 l
