5
Technical features and dimensions
1
Boilers for Central Heating (C.H.) only:
RTN 24 Natural Draught boiler with
electronic ignition.
RTFS 24 Room sealed, forced draught
boiler with electronic ignition.
The maximum nominal output of DUA plus
24 boiler is 24,0 kW, in both, C.H. and
D.H.W. production.
DUA plus 24 boiler is complete of all the
safety and control devices foreseen by the
standards.
DESCRIPTION OF THE COMPONENTS:
• Bi-thermal cooper heat exchanger (only
for C version) with optimized efficiency
• Mono-thermal cooper heat exchanger
(only for R version) with optimized
efficiency
• Device for C.H. output adjustment
independent from the one for D.H.W.
output adjustment.
• Economizer for the automatic D.H.W. and
gas flow rate limitation up to the
atteinment of 28°C (Unical patent of
T.E.S. – Thermostatic Energy Saver)
(only for C version)
• Flame modulation depending on the
Circulating pump operating also during
the D.H.W. drawings
• Panel board with insulation protection
degree IP X4D.
• Signal lamp indications for: D.H.W.
request, C.H. request, power on, burner
in operation, thermometer, boiler fault.
• D.H.W. priority flow switch (only for C
version)
• Safety pressure switch against lack of
water in the heating circuit
• Boiler manometer
• Installation filling valve
• D.H.W. flow rate limiter at 10 l/min (only
for C version)
• Circulating pump with built-in automatic
air vent
• C.H. temperature adjuster (35 ÷ 85° E)
(45 ÷ 85 T)
• D.H.W. temperature adjuster (40 ÷ 60°)
(only for C version)
• Patented thermostatic diverting valve (T)
or electric motorized diverting valve (E)
• Limit thermostat (100°C)
• Anti-freezing protection
• Winter/Summer/Anti-freezing selector
• Mounting jig for predisposition of
hydraulic connections
• Electronic ignition
• Powder painted steel plate casing
• Antispillage device in the smoke
evacuation circuit (TN)
1.1 - TECHNICAL FEATURES
DUA plus 24 is a wall hung gas boiler with
atmospheric burner and elctronic ignition. It
is supplied in the following versions:
TN Natural draught
TFS Forced draught
(T) With Thermostatic diverting valve
(E) With Electric diverting valve
Then the denominations of the complete
DUA Plus range of boilers are the following:
Boilers for Central Heating (C.H.) and
instantaneous Domestic Hot Water
(D.H.W.)production:
CTN 24 T Natural Draught boiler with
electronic ignition and
thermostatic diverting valve.
CTFS 24 T Room sealed, forced draught
boiler with electronic ignition
and thermostatic diverting
valve.
CTN 24 E Natural Draught boiler with
electronic ignition and electric
diverting valve.
CTFS 24 E Room sealed, forced draught
boiler with electronic ignition
and electric diverting valve.
fig. 1
450
863
361
1
7
8
105
120 120 105
2
0
6
143
1
5
1
,
5
1
4
2
M
C
G
FR
1.2 - DIMENSIONS
M C.H. system flow
C D.H.W. outlet
G Gas inlet
F D.C.W. inlet
R C.H. system return
view from above
view from below
TECHNICAL FEATURES ET DIMENSIONS
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