Nova Florida Pictor Dual Installation, Use And Maintenance Manual - page 8
8
2.1 Technical characteristics
The boiler is equipped with an
atmospheric burner. The following
versions are available:
24 model: heat output is 23.31 kW
(TN) and 23.77 (TFS)
28 model: heat output is 28.6 kW
C: central heating and DHW sup-
ply
R: central heating only (an exter-
nal optional water cylinder can be
connected)
TN: open chamber and natural
draught
TFS: sealed chamber and forced
draught
All versions are equipped with
electronic ignition.
The available boiler models are the
following:
- CTN 24: open chamber and natu-
ral draught, electronic ignition and
instant DHW supply.
- RTN 24: open chamber and natu-
ral draught, electronic ignition, CH
supply only
- CTFS 24: sealed chamber and
forced draught, electronic ignition
and instant DHW supply
- RTFS 24: sealed chamber and
forced draught, electronic ignition,
CH supply only
- CTFS 28: sealed chamber and
forced draught, electronic ignition
and instant DHW supply
- RTFS 28: sealed chamber and
forced draught, electronic ignition,
CH supply only
All models meet applicable EEC
Directives:
Gas Directive 90/396/EEC dated
29th June 1990.
Performance Directive 92/42/EEC
dated 21st May 1992.
EMC Directive 89/336/EEC dated
3rd May 1989, as amended by
Directive 92/31/EEC dated 28th
April 1992.
European Community Low Voltage
Directive 73/23/EEC dated 19th
February 1973, as amended by
Directive 93/68/EEC dated 22nd
July 1993, and is fitted by all safety
devices prescribed in current stan-
dards for the product.
The principal technical characteri-
stics of the boiler are listed below:
Construction characteristics
- Mono-thermal, high performan-
ce, copper heat exchanger
- Stainless steel plate DHW heat
exchanger
- Three-speed circulation pump
de-areator equipped
- 8-litre expansion vessel
- Low water safety pressure
switch
- DHW priority flow switch
- 10 litre/min DHW flow limiting
device
- Adjustable by-pass
- Boiler loading and draining taps
- DHW and CH temperature probes
- Safety limit thermostat
- IP44 electrically protected con-
trol panel
- Modulating electronic safety
board
- Electronic ignition and external
transformer
- Flue thermostat (TN models)
- Flue pressure switch (TFS
models)
- Gas valve
User interface
- External probe-ready electronics
- Reset, stand-by, summer/winter,
summer and anti-freezing function
switch
- DHW temperature switch for C
models or R models equipped with
external cylinder (35/62°C range)
- CH temperature switch (35/83°C
range)
- Lights indicating:
• Power mains connection
• CH supply
• Burner shut-down
• Burner shut-down due to ove-
rheating
• Burner shut-down due to incorrect
flue draught (TN models)
• Burner shut-down due to flue
pressure switch intervention (TFS
models)
• Low water pressure
• CH and DHW probe fault
- Led displayed water temperature
- CH and DHW probe fault
- Water pressure gauge
- Room thermostat (24 Vdc 3 mA)
Operating characteristics
- DHW priority function
- CH mode electronic flame
modulation, timer controlled flame
rising ramp (50 seconds)
- DHW mode flame electronic
modulation
- Boiler anti-freezing function
(ON: °C, OFF: 30°C or after 15 min.
burner operation)
- External cylinder anti-freezing
function (for R models equipped
with external cylinder) (ON: 5°C,
OFF: 10°C or after 15 mins. burner
operation)
- Anti -“legionella” function (for
R models equipped with external
cylinder)
- External cylinder timer connec-
tion (for R models equipped with
external cylinder)
- Boiler max heat output adjusting
trimmer
- Ignition heat input adjusting
trimmer.
- Timer-controlled “chimney
sweep” function (15 minutes)
- Ignition flame propagation func-
tion
- Timer-controlled room thermo-
stat (240 seconds when CH flow
temperature > 40°C)
- Pump post-circulation function
in boiler winter mode (180 secon-
ds)
- DHW pump post-circulation
function in boiler winter mode (6
seconds)
- DHW post-ventilation function
in boiler summer mode (6 seconds
TFS models)
- Post-ventilation safety function
(ON: 95°C, OFF: 90°C - TFS models)
- Pump anti-locking function (6
seconds of pump operation each
24 hours of boiler inactivity).
2. TECHNICAL CHARACTERISTICS AND DIMENSIONS