17
Experts in heating
User Manual
Twin Bio
- PLV 09.13
5
.
D
esi
g
n
gu
idelines
5.B. Boiler room requirements
a) Boiler foundation min. 0.05 m
Boiler foundation requirements:
• the foundation must protrude over the boiler room fl oor;
• the foundation edges must be secured with steel angle
sections.
b) Boiler room fl oor
Boiler room fl oor requirements:
• the boiler room must be made of non-fl ammable materials,
resistant to extreme temperature changes and impact;
• the fl oor must descend in the well direction.
c) Boiler room ventilation
Boiler room ventilation requirements:
• do not use mechanical ventilation systems in the room with
solid fuel furnace if the combustion air is supplied directly
from the room and the fl ue gas is discharged gravitationally
via a duct from the device;
• the boiler room must be fi tted with a ventilation duct with
a cross section of at least 50% of the fl ue cross sectional
area, min. 20x20 cm
2
;
• the boiler room must be fi tted with a ventilation duct with
a cross section of at least 25% of the fl ue cross sectional
area with the outlet under the boiler room ceiling;
• the outlet duct cross section must be min. 14x14 cm
2
;
• the vents must be made of non-fl ammable materials.
5.C. Hydraulic system requirements
• the hydraulic system must be made in accordance with the
good building practices, relevant standards and regulations,
and the design input
• the boiler may operate in a sealed heating system (sealed
diaphragm tank) provided that the boiler supply and return
line is fi tted with a dual action relief valve
• a pressure reducer must be installed with a relief valve to
avoid safety valve opening in case of a rapid increase in
boiler water pressure
• an expansion tank must be installed in the highest point of
the heating system and protected against frost
• the expansion tank should be installed at the boiler return
• to guarantee proper working conditions and failure free
boiler operation, ensure minimum temperature at the boiler
return by installing the boiler pump with a mixing valve
(boiler mixing system)*
*Water temperature at the boiler return must be min. 45°C
to prevent boiler corrosion as a result of undesirable and
excessive fl ue gas condensation in the boiler. The boiler
circulation pump must be fi tted with a control valve.
The pump output must be approx. 40÷50% of the nominal
water fl ow through the boiler. The boiler circuit design must
guarantee the difference in temperature between the supply
and the return of max. 15°C.
CAUTION!
The boiler pump must be installed between two cut-off
valves. To protect the pump against high pressure
difference between the suction and discharge:
• install the boiler pump at the system return
(especially in systems with high water capacity,
where the discharge pressure is very high);
• protect the boiler pump at the suction against low
pressure.
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