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19
FITTING THE BURNER TO THE BOILER AND CONNECTING THE GAS PIPES
The burner is fitted with a sliding attachment flange
on the burner head. When fitting the burner to the
boiler, this flange must be
correctly positioned
so
that the burner head penetrates the boiler
by the
amount specified by the manufacturers of the
boiler
.
When the burner is fitted correctly to the boiler, pro-
ceed with the connection of the gas feed pipe (see
BT 8871 and BT 1387).
The size of the gas feed pipe must be proportional to
its length and to the gas delivery rate in accordance
with the UNI standard (see diagram), and it must be
perfectly airtight and properly tested before running
the initial tests on the burner. It is essential to fit a
connector to this pipe, near to the burner, for the easy
dismounting of the burner and/or the opening of the
boiler door.
The DUNGS mod. MB... valve has a filter and gas
pressure stabilizer, which means that only the cut-off
cock and the vibration damper joint should be fitted
to the gas feed pipe.
A pressure reduction unit should be installed outside
the heating system only in cases where the gas pres-
sure exceeds the level permitted by the standard (400
mm.W.C.).
It is recommended to put a bend directly on the burner gas train before fitting the detachable connector.
This is to allow the opening of the boiler door, when the connector itself has been opened.
These details are clearly illustrated in the following diagram (BT 8871).
8871.tif
LUNGHEZZA
VIRTUALE TRA
T
T
A
in m / VIRTUAL
LENGHT DEAL
T WITH IN METRES
LONGUER VIRTUELLE en m / VIRTUELLE L
Ä
NGE in m / LONGITUD VIRTUAL en m.
PORTATA / FLOW / DEBIT / DURCHSATZ / CAUDAL m
3
/h
BT 1387
ENGLISH
Содержание COMIST 23SP
Страница 26: ...25 GAS BURNERS CONTROLS LGB for small to medium capacity burners with or without a fan intermittent operation ...
Страница 27: ...26 GAS BURNERS CONTROLS LGB for small to medium capacity burners with or without a fan intermittent operation ...
Страница 29: ...28 GENERAL DIAGRAM FOR TWO STAGE L P G PRESSURE REDUCTION FOR BURNER OR BOILER N BT 8721 2GB Rev 21 03 90 ...
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