11
Mareli Systems
3.2 Basic rules and prescriptions.
The boiler with water jacket operates on water heating boiler principle.
The advantage of this type of heating system is the maximum utilization of the heat that is pro-
duced during the combustion process. With this method the heat from the combustion chamber
is taken to remote and hard to reach for a normal heat exchange premises in order to maintain an
even temperature and warmth comfort.
•
Ensure that every branch and element of the installation is airtight at every single moment of its ex-
ploitation.
•
All elements of the installation must be protected from freezing, especially if the enlarging pot or
other parts are situated in non-heated premises.
•
The circulation pump can be chosen by the capacity required by using the following formula:
G=0,043. P , (m³/h), in which:
P, kW is the heat output of the water jacket. The circulation pump can be turned on and off by
the means of a thermostat in combination with an electric switch.
•
The first service cleaning of the pump’s filter must be done immediately after testing the installation.
•
If an old installation is going to be used it must be washed several times to ensure the removal of any
accumulated dirt on the surfaces of the water jacket.
•
Do not drain the circulating water of the installation during the non-heated season.
•
Chemical treatment of the circulating water is not recommended.
Radiator
Deaerator
Expansion vessel
Return Valve
Lyra
Boiler
BOILER
Pump
Radiator
Radiator
Radiator
“Mareli Systems” provides a warranty and out of warranty service and replacement of the water
jackets. The warranty is not valid in case of a boiler with a swollen water jacket which is a result
of pressure increase in the system and improper connecting. The water jackets are tested under
pressure of 400 kPa (4 bar).
It is recommended that the assembly is performed by an authorized specialist.
3.3 Assembly of the duct components.
Duct components and pipes
For the assembly of the duct pipes the use of non-flammable materials, resistant to the flammable
products and condensation is obligatory. The assembly must be performed in such a manner so
it guarantees the airtight sealing and prevents condensation. If possible, avoid adding horizontal
sections. Direction shift is done by using knee joints with a max angle of 45˚.
For heating devices equipped with a smoke ventilator, i.e all of the “MARELI” boilers, the follow-
ing instructions must be observed:
