,35(6(17$7,21
'(6&5,37,21
This is a wall-mounted condensing boiler, with a
closed circuit hot-water heating boiler, type B
23
,
C
13
, C
33
, with a linear power modulation, and a pre-
mixed burner with an air-gas servo-control system,
meeting the PREN 483 (12-97), EN 437 (02-94),
PREN 677 (03-96).
- EC type approval:
• THR 5-25: N° CE-0085AQ0543,
• THR 2-13: N° CE-0085AT0244,
- gas certification DVGW - VP 112 (01-95):
• THR 5-25: N° Q 022/001,
• THR 2-13: N° QG-3202AT0396,
- blue Angel Label,
- for THR 5-25: Hamburg (No
x
< 20 mg/kWh -
CO < 15 mg/kWh) quality seal.
The power output is controlled by an integrated
electronic regulator according to the heating sys-
tem’s or domestic hot water requirements. The gas/
air ratio is controlled by a servo-valve system which
maintains the correct mixture across the full opera-
ting range.
A cover with a calm, restrained styling contains the
following components:
- a high performance condensing heat exchanger
made from tubular fins,
- a variable-speed fan (39 V) controlled by the re-
gulator,
- a premixed burner with a heat resistant stainless
steel grate,
- a 24 Volt gas valve unit with dual air pressure val-
ve control,
- a heating circuit safety valve (3 bar),
- a condensate siphon trap,
- an “Overheat” safety cut-out with manual reset
(100 °C),
- a water pressure sensor,
- a “Flue gas overheat” safety cut-out with manual
reset (85 °C),
- an expansion vessel,
- a circulating pump with an air vent,
- a selector valve,
- a microprocessor-based control panel for provi-
ding boiler regulation and ensuring smooth run-
ning:
• flame ionisation monitoring,
• radiator temperature adjustment,
• domestic hot water temperature adjustment,
• pressure display,
• operating sequence display,
• fault display,
• on/off switch.
