15
Instructions for the installer
As a safety measure against gas leaks, Unical
recommends installing a surveillance and pro-
tective system composed of a gas leakage
detector combined with an on-off selenoid
valve fitted on the gas supply line.
The gas supply pipe must have a section which is identical or
greater then the one used on the boiler and must assure a
correct gas pressure.
It is however important to comply with the “General installation
standards” indicated in the standards UNI 7129, UNI 7131 and
UNI 1137-1.
Before commissioning an internal gas distribution system and
therefore before connecting it to the gas meter, the complete
installation must be tested for gas soundness.
If any part of the system is concealed from view the gas soun-
dness test must be carried out before covering the pipes.
Before connecting the pipework the system must be tested
with air or inert gas at a pressure of at least 100mbar.
Before commissioning the boiler ensure that the following ope-
rations are carried out:
-
Open the gas meter cock and vent the air contained in the
piping and subsequently proceed to vent device by device.
-
Check, with the gas cock turned off, that there are no gas
leaks. During the 2
nd
quarter of the hour from the start of
the test, no pressure drop should be detected by the pres-
sure gauge. Any gas leaks must be found by using only
water soap solutions, or an equivalent product, and elimi-
nated. Never look for gas leaks using a naked flame.
DANGER!
The gas connection must be carried out only
by a qualified engineer who will have to res-
pect and comply to the regulations in force
and to the requirements indicated by the lo-
cal gas supplier. An incorrect installation
could cause injury to persons, animals or
damage to property. The manufacturer shall
not be held liable for any injury and/or da-
mage.
Before installing the boiler it is recommen-
ded to thoroughly clean all the fuel feed pi-
pework in order to remove any eventual re-
sidual grime which could compromise the
boilers correct functioning.
If you smell gas:
a) Do not turn on or off electrical switches,
use the telephone or any other object
which can provoke sparks;
b) Open all doors and windows in order to
allow fresh air to enter and purify the
room;
c) Close all gas cocks
d) Contact a service engineer, qualified in-
staller or the gas supply company.
3.5 - GAS CONNECTION
Summary of Contents for Alkon Cargo 35
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