Kostrzewa Twin Bio Luxury Compact NE 8 Notice Technique page 63

4. Design guidelines
b. Boiler room requirements
Boiler foundation min. 0.05 m
Boiler foundation requirements:
• the foundation must protrude over the boiler room floor
• the foundation edges must be secured with steel angle sections
• foundation for boiler and the hopper should be properly levelled.
Significant drop may cause the wheeled hopper to move.
Boiler room floor
Boiler room floor requirements:
• the boiler room must be made of non-flammable materials, resistant to
extreme temperature changes and impact
• the floor must descend in the well direction
Boiler room ventilation
Boiler room ventilation requirements:
• do not use mechanical ventilation system in the room with solid fuel
furnace if the combustion air is supplied directly from the room and the
flue gas is discharged gravitationally via a duct from the device
• the boiler room must be fitted with a ventilation duct with a cross section
of at least 50% of the flue cross sectional area, min. 20x20 cm
• the boiler room must be fitted with a ventilation duct with a cross section
of at least 25% of the flue cross sectional area with the outlet under the
boiler room ceiling
• the outlet duct cross section must be no less than 14x14 cm
• the vents must be made of non-flammable materials
c. Hydraulic system requirements
• The hydraulic system must be made in accordance with 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 fitted with a dual
action relief valve - a thermal relief valve, e.g. SYR 5067, and a pressure
relief valve, max. 2 bar - in order protect the exchanger from damage that
may be caused by rapid increase in pressure during water heating.
• 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 a minimum temperature at the boiler return by installing the
boiler pump with a mixing valve (boiler mixing system)*
• A temperature sensor of the system protecting against exceeding
permissible temperatures must be installed directly on the boiler
• The boiler is compatible with water as a medium conforming to water
quality requirements.
Leader in pellet boilers
WATER TEMPERATURE AT THE BOILER RETURN MUST BE MIN. 45°C
TO PREVENT BOILER CORROSION AS A RESULT OF UNDESIRABLE
AND EXCESSIVE FLUE GAS CONDENSATION IN THE BOILER.
THE BOILER CIRCULATION PUMP MUST BE FITTED WITH A CONTROL
VALVE. THE PUMP OUTPUT MUST BE APPROX. 40÷50% OF THE
NOMINAL WATER FLOW THROUGH THE BOILER. THE BOILER CIRCUIT
DESIGN MUST ENSURE THAT THE DIFFERENCE IN TEMPERATURE
BETWEEN THE SUPPLY AND THE RETURN DOES NOT EXCEED 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.
2
d. Water quality requirements
Water quality affects the life and efficiency of heating devices and the entire
system. Incorrect water parameters will result in the corrosion of heating
device surfaces, transport ducts, or lime scale deposits. It may lead to failure or
damage of the entire heating system. The warranty does not cover any damage
caused by corrosion and lime scale deposits. Strict adherence to the water quali-
ty requirements of the manufacturer is a precondition for any warranty claims.
The water for filling boilers and heating systems must meet the requirements of
relevant standards and regulations.
Required boiler water parameters:
• pH >8.5
• total hardness <20°f
• free oxygen content <0.05 mg/l
• chloride content <60 mg/l
The treatment method for water used in the heating systems must meet the
above requirements. Use of antifreeze additives must be consulted with
the manufacturer (KOSTRZEWA). Failure to comply with the boiler water
quality requirements may result in damage to the heating system components
(e.g. boiler) and is not covered by the warranty. It may invalidate the warranty
and result in additional charges in case an authorized service centre is involved.
Twin Bio Luxury Compact NE v01 User Manual – EN 01.19
63