1
DESCRIPTION OF THE BOILER
1 .1
INTRODUCTION
"GG BT" are the gas fuelled burner groups
for heating and the production of hot sani-
tary water, constructed to satisfy the needs
of collective residential housing and mo-
dern plant .
They are apparatuses which conform to
1 .2
DIMENSIONI
1 .2 .1
"25 OF" model (fig . 1)
189
U
E
G
450
1 .2 .2
"25 - 30 BF" models (fig . 1/a)
K
U
E
G
M
L
66
the European directives 2009/104/CE,
2004/108/CE, 2006/95/CE and 92/42/CE .
The can be fuelled by natural gas (G20) or
LPG (G30-G31) .
This booklet gives the instructions for the
following models:
– "GG BT 25 OF" open combustion cham-
ber with natural draw .
122
ø D
G
M R
100
60
290
125
G
R
100 60
290
– "GG BT 25-30 BF" sealed combustion
The instructions given in this manual are
provided to ensure proper installation and
perfect operation of the appliance .
39
50
29,5
R
M
G
E
U
70
70 70 70
=
=
39
50
R
M
G
E
U
70
70
70 70
=
=
chamber forced flow .
CONNECTIONS
R
C .H . return
G 3/4" (UNI-ISO 228/1)
M
C .H . flow
G 3/4" (UNI-ISO 228/1)
G
Gas connection
G 3/4" (UNI-ISO 228/1)
E
D .H .W . inlet
G 1/2" (UNI-ISO 228/1)
U
D .H .W . outlet
G 1/2" (UNI-ISO 228/1)
DIMENSIONS
25 OF
D mm
130
29,5
CONNECTIONS
R
C .H . return
G 3/4" (UNI-ISO 228/1)
M
C .H . flow
G 3/4" (UNI-ISO 228/1)
G
Gas connection
G 3/4" (UNI-ISO 228/1)
E
D .H .W . inlet
G 1/2" (UNI-ISO 228/1)
U
D .H .W . outlet
G 1/2" (UNI-ISO 228/1)
DIMENSIONS
25 BF
L mm
400
K mm
203
Fig . 1/a
Fig . 1
30 BF
450
221