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3.2.8.
Gas mains connection
Cross-section of gas supply pipe must be equal or greater than the boiler one. Cross-section size depends on its length, layout pat-
tern, gas flow rate. It is therefore to be sized accordingly.
Comply with installation standards enforced in the installation country. They are considered as an integral part of this booklet.
Remember that before operate an internal gas distribution system and before connecting it to a meter, it must be checked for leaks.
In order to perform a leak test, operate according to the following indication:
- The leak test is to be carried out before the pipes are covered. The leak test must not be carried out using 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 a boiler to gas supply network the use of an appropriately sized and made gasket (pic. 17).
The boiler gas inlet thread configuration is not suitable for hemp, plastic tape or similarly made gaskets.
3.2.9. Plumbing connections
Prior to installing the boiler, the hydraulic system should be cleaned in order to remove impurities; they might be present in system
components and damage the pump or the heat exchanger.
CENTRAL HEATING
CH flow pipe and CH return pipe must be connected to their relevant 3/4” coupling on the boiler (see pic. 7).
When sizing CH system pipes, bear in mind load losses caused by radiators, thermostatic valves, radiator gate valves, and the confi-
guration of the system itself.
It is advisable to convey the discharge flow of boiler safety valve to the sewer system. Should that not be performed, and the
safety valve be activated, flooding of the room in which the boiler is installed may occur.
The manufacturer shall not be held responsible for any damage resulting from failure in observing the above mentioned
technical provision.
DOMESTIC HOT WATER
DHW flow pipe and water mains pipe must be connected to their relevant 1/2” couplings C and F on the boiler (pic. 7).
Hardness of water supplied to the boiler may increase heat exchanger cleaning and /or replacement frequency.
WARNING
Depending on hardness level of the water supplied, it might be necessary installing a suitable water treatment device for
domestic use and in compliance with applicable laws and standards.
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 system.
GASKET
Pic. 17 – Gas main connection
