37
fig. 17
Gasket
3.2.8.
Connection to gas mains
Gas supply pipe cross-section must be equal or greater than boiler gas pipe.
Cross-section gas pipe size depends on its length, layout pattern, gas flow rate. Gas pipe size is to be selected accordingly.
Comply with installation standards enforced in the country where the boiler is installed which are considered as fully transcribed in this
booklet.
Remember that before operating an indoor gas distribution system and before connecting it to a meter, it must be checked for
leaks.
If some system parts are not visible, the leak test is to be carried out before the pipes are covered.
Leak test is NoT to be carried out employing flammable gas: use air or nitrogen for this purpose.
once gas is in the pipes, leak test by a naked flame is forbidden; use specific products available on the market.
When connecting the boiler to gas supply network, it is CoMPuLSoRY to install an appropriately sized gasket made from
suitable material (fig. 17).
The boiler gas inlet coupling is NoT suitable for hemp, teflon tape or similarly made gaskets.
3.2.9.
Hydraulic connections
Prior to installing the boiler, the hydraulic system is to be cleaned in order to remove impurities; they could be present in system components and
damage the pump and the heat exchanger.
HeATING
The CH outlet and return pipes must be connected to the respective 3/4” connectors (m and R) on the boiler (see fig. 3, 4 and 5).
When calculating the cross section of CH system pipes, bear in mind load losses induced by radiators, thermostatic valves, radiator gate valves, and
the configuration of the system itself.
It is advisable to convey the discharge flow of boiler safety valve to the sewer system. Should the above precaution not be
implemented and the safety valve be activated, boiler room flooding may occur.
Manufacturer shall not be held responsible for any damage resulting as failure in observing the above mentioned technical
precaution.
DoMeSTIC HoT WATeR (model KC)
Cold water inlet and DHW outlet shall be connected to the boiler through the special 1/2" C and F fittings (fig. 3).
Hardness of water supplied to the boiler may increase the plate heat exchanger cleaning/replacement intervals.
Depending on the hardness of the mains water supply, ascertain whether or not to install appropriate domestic water treatment
systems using water treatment products suitable for drinking water and compliant with the standards in force in the country of
installation.
Water treatment is always advisable when water supplied to the boiler is more than 20°f hard.
Water supplied by commonly marketed water softeners, due to PH level induced in water, may not be compatible with some
components in the system.
DoMeSTIC HoT WATeR and eXTeRNAL WATeR CYLINDeR (model KRB)
Model KRB: return and flow to the cylinder shall be connected to the boiler through the corresponding 1/2” mB and RB fittings (fig. 4) which in fig.
9 are indicated with letters C and F.
In model KRB water from MB connection (fig. 4) must not be discharged into the DHW distribution system.
CondenSaTe dRaIn
Comply with condensate drain laws and standards applicable in the country of installation, which are considered herein integrally transcribed.
Unless forbidden, the condensate produced by combustion is to be routed via the condensate drain through a discharge system connected to the
domestic sewer, which due to its basicity, counteracts flue gas condensate acidity.
In order to avoid domestic sewer odour to reach the premises, it is advisable to install an appropriate device between the discharge system and the
domestic sewer.
The condensate drain system and the domestic discharge system is to be made of an adequate, condensate-resistant material.
The manufacturer shall not be held responsible in case of damage to people, animals, or property due to failure to follow the above
mentioned instructions.
