Fondital Nova Florida DELFIS CTFS 24 AF User manual

DIDACTIC MANUAL
FAMILY: Wall-Hung
Atmospheric Boilers
GROUP: Forced and Natural
Draught Instant
Boilers
MODELS: Delfis-Antea
VERSION: For indoor installation
PART NO.: AST 14 C 259/00
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1st Edition, February 2013
ENGLISH

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2 AST 14 C 259/00
Contents
SECTION 1
TECHNICAL CHARACTERISTICS
1.1 – Models
1.2 – Overall Dimensions
1.3 – Technical Specifications ___________________Page 04
SECTION 02
CONTROL PANEL AND DIAGNOSIS
2.1 – User's Interface
2.2 – LCD
2.3 – Boiler Status and Fault Codes ___________________Page 10
SECTION 03
HYDRAULIC DIAGRAMS AND COMPONENTS
3.1 – Hydraulic Diagrams
3.2 – Hydraulic Unit
3.3 – Bi-thermal Heat Exchanger
3.4 – Expansion Vessel
3.5 – Flue Gas Fan
3.6 – Gas Unit ___________________Page 14
SECTION 04
GAS SETTING AND TSP PARAMETERS
4.1 – Gas Valve Setting
4.2 – Flue Cleaning Function
4.3 – Gas Conversion
4.4 – TSP Parameters ___________________Page 21
SECTION 05
OPERATING LOGIC
5.1 – Main General Characteristics ___________________Page 26
SECTION 06
ELECTRICAL SYSTEM
6.1 – Electronic Board
6.2 – Electrical Connections
6.3 – Wiring Diagram ___________________Page 39
SECTION 07
VENT DUCTS AND TUBES
7.1 – Natural Draught Boiler Vent Duct
7.2 – 100/60 Co-axial Air/Vent Ducts
7.3 – 80/80 Split Air/Vent Ducts
___________________Page 41
TABLE OF TECHNICAL FAULTS
___________________Page 47

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3 AST 14 C 259/00

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4 AST 14 C 259/00
SECT. 1
TECHNICAL CHARACTERISTICS
1.1 MODELS
DELFIS-ANTEA CTFS 24 AF
DELFIS-ANTEA CTN 24 AF
ABBREVIATION KEY:
C : combined
TFS : sealed chamber forced draught
AF : still water (pump is not powered in DHW)
TN : natural draught
MAIN CHARACTERISTICS :
DELFIS-ANTEA CTFS 24 AF: DHW + CH combined boiler, forced draught, sealed chamber, still water, bi-
thermal;
DELFIS-ANTEA CTN 24 AF: DHW + CH combined boiler, natural draught, sealed chamber, still water, bi-
thermal.
1.2 OVERALL DIMENSIONS
Height H = 700 mm
Width L = 400 mm
Depth P = 250 mm
Delfis Antea

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5 AST 14 C 259/00
CTFS VERSION

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6 AST 14 C 259/00
CTN VERSION

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7 AST 14 C 259/00
INSTALLATION TEMPLATE

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8 AST 14 C 259/00
1.3 TECHNICAL SPECIFICATIONS
General Characteristics
CTN 24 AF CTFS 24 AF
Operating parameters
Equipment category II2H3+
Number of burner nozzles n° 11
Minimum CH flow rate l/h 550
CH circuit min. pressure bar 0.5
CH circuit max. pressure bar 3
DHW circuit min. pressure bar 0,5
DHW circuit max. pressure bar 8
DHW specific flow rate (t 30°C) l/min 10.3 11.1
Safety thermostat triggering temperature °C 95
Air pressure switch pressure ON Pa - 45
Air pressure switch pressure OFF Pa - 35
Central heating water setting range °C 35 to 78
Maximum CH working temperature °C 78 + 5
DHW setting range °C 35 to 50
Maximum DHW working temperature °C 50 + 7
Total capacity of expansion vessel l 7
System recommended max. capacity (**) l 100
Nominal electrical data
Electric Power Supply : Voltage / Frequency V - Hz 230-50
Power mains supply fuse A 2
Electric cabinet protection degree IP X4D
Max. absorbed power W 69 98
Electric power in stand-by condition W < 2
Overall dimensions and connections
Height mm 700
Width mm 400
Depth mm 250
Net weight (without packaging) Kg 22.5 24.0
Gas connection - G ½
Flow and return connection - G ¾
Cold water and hot domestic water.... connection - G ½
Consumption
Methane gas consumption (*) m3/h 2.6 2.7
Butane gas consumption (*) kg/h 1.93 2.0
Propane gas consumption (*) kg/h 1.89 1.98
Operating characteristics
Type of ignition - Electronic
Flame surveillance - Ionization
Type of detection - Phase-neutral polarization
Hot DHW production - Instant
(*) Value related to 15°C - 1013 mbar condition
(**) Maximum water temperature at 83°C, vessel preloaded at 1 bar.

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9 AST 14 C 259/00
Design data and flue duct sizing
CTN 24 AF
Pmax. Pmin.
Load
at 30%
Casing heat loss % 3.92 4.45 -
Flue system heat loss with burner on % 5.98 8.15 -
Flue (methane gas) mass flow g/s 16.72 14.98 -
Flue temp. – air temp. °C 83 62 -
CO2 value (methane - propane - butane) % 5.7 – 6.7 – 7.3 3.0 – 3.5 – 3.7 -
Boiler efficiency rating % 90.1 87.4 89.2
Efficiency rating
(according to 92/42/EC) - ★★
Nox emission class - 2
CTFS 24 AF
Pmax. Pmin.
Load
at 30&
Casing heat loss % 1.01 2.04 -
Flue system heat loss with burner on % 5.89 10.26 -
Flue (methane gas) massive flow g/s 14.18 15.21 -
Flue temp. – air temp. °C 110 87 -
CO2 value (methane - propane - butane) % 7.2 – 8.6 – 6.8 3.0 – 3.6 – 3.0 -
Boiler efficiency rating % 93.1 87.7 90.5
Efficiency rating
(according to 92/42/EC) - ★★★
Nox emission class - 3
Settings
CTN 24 AF
_Heat
capacity Thermal Power MIN-MAX Supply pressure Nozzle Diameter Burner pressure MIN-MAX
(kW) (kW) (mbar) (mm) (mbar)
methane gas
G20 24.5 10.5 – 22.1 20 1.27 3.2 – 12.4
butane gas
G30 24.5 10.5 – 22.1 29 0.77 7.2 – 27.1
propane gas
G31 24.5 10.5 – 22.1 37 0.77 9.2 – 35.0
CTFS 24 AF
heat
capacity Thermal Power MIN-MAX Supply pressure Nozzle Diameter Burner pressure MIN-MAX
(kW) (kW) (mbar) (mm) (mbar)
methane gas
G20 25.5 11.0 – 23.7 20 1.35 3.0 – 11.9
butane gas
G30 25.5 11.0 – 23.7 29 0.80 6.8 – 26.4
propane gas
G31 25.5 11.0 – 23.7 37 0.80 8.6 – 33.9

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10 AST 14 C 259/00
SECT.2
CONTROL PANEL AND DIAGNOSIS
2.1 USER'S INTERFACE
1. Set domestic hot water
temperature
These buttons are used to set (increase
or decrease) the domestic hot water
temperature within a range from 35°C to
50°C.
2. Recall information and confirm
parameters
This button is used to scroll the
sequence of the values of some
parameters (see following paragraphs). It
is also used to
confirm the
edited
parameters
setting.
3. Select boiler state
Press this button to set the following functions.
SUMMER :
Boiler produces domestic hot water, only.
WINTER :
Boiler provides both central heating water and domestic hot water.
CENTRAL HEATING ONLY :
Boiler provides central heating water only.
STAND-BY :
Boiler in standby mode: central heating and DHW functions are disabled.
4. Resume boiler function
This button is used to re-enable boiler operation after a shut-down.
5. LCD
The LCD shows the boiler status and information relative to boiler function (see the following paragraphs).
6. Set central heating water temperature
These buttons are used to set (increase or decrease) the central heating water temperature within a range
from 35°C to 78°C.
5. Water pressure gauge
The gauge shows water pressure in the CH system.

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11 AST 14 C 259/00
2.2 LCD
a. DHW mode indicator
Illuminates when the boiler is operating in DHW mode.
Flashes when setting the DHW temperature with the buttons 1(see previous paragraph).
b. Parameter indicator
Illuminates when the parameter programming mode is accessed (function reserved for installing technician)
c. Alphanumeric indicator
Alphanumeric values indicating:
- flow temperature during “heating” function;
- central heating water temperature setting;
- domestic hot water temperature during the “DHW” function;
- domestic hot water temperature setting;
- boiler status;
- boiler diagnosis.
d. Central heating indicator
Illuminates when the boiler is operating in central heating mode.
Flashes when setting the CH temperature with adjuster 6 (see previous paragraph).
e. Parameter editing indicator
Illuminates when the value of the parameter can be edited (in this case, the indicator lights together with the
symbol b). The parameter identification screen flashes in alternation with the value screen.
f. Flue function indicator
Illuminates flashing when the flue function is enabled by pressing buttons 2and 4at the same time (see
previous paragraph). When this function is ON, boiler flow temperature is displayed.
g. Flame lighting indicator
Illuminates when the burner is lit.
h. Boiler status indicator
Icons indicate which operating modes are enabled:
SUMMER: only icon lit
SUMMER and WINTER: both icons lit
CENTRAL HEATING ONLY: only icon lit
STAND-BY: icon lit

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2.3 BOILER STATUS AND FAULT CODES
Normal operation
Boiler in STAND-BY mode.
Boiler in SUMMER mode
No active function
Flow temperature displayed
Boiler in SUMMER or WINTER mode.
No active function
Flow temperature displayed
Boiler in CENTRAL HEATING ONLY mode
No active function
Flow temperature displayed
Boiler in SUMMER mode
DHW function active with flame lit.
DHW temperature displayed
Boiler in SUMMER or WINTER mode.
DHW function active with flame lit.
DHW temperature displayed
Boiler in SUMMER or WINTER mode.
CH function active with flame lit.
Flow temperature displayed
Boiler in WINTER mode
CH function active with flame lit.
Flow temperature displayed
Malfunction; shut-downs to be reset from boiler with the "Reset" button
Boiler not receiving electrical power
Boiler shut-down due to lack of flame
Boiler shut-down due to safety thermostat triggering
Boiler shut-down due to pressure switch or flue thermostat
triggering

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13 AST 14 C 259/00
Malfunction; shut-downs not resettable from boiler
Boiler shut-down due to water pressure switch
triggering
Flow probe fault
DHW probe fault
Return probe fault
Remote Control communication fault
Boiler type detection error (CTFS or CTN)
Gas/fan relay operator error
Gas modulation coil fault
Power supply voltage level too low (a)
Flow gradient too high
Max. number of resume attempts from remote
exceeded
Notes: Backlighting:
Lights up steady on when some boiler buttons are pressed;
Lights up flashing (3 seconds ON and 2 seconds OFF) when a shut-down or
a fault occur.

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14 AST 14 C 259/00
SECT.3
HYDRAULIC DIAGRAMS AND COMPONENTS
3.1 HYDRAULIC DIAGRAMS
CTN
1. DHW temperature probe 14 Low water pressure switch
2. Modulating gas valve 15. 3 bar safety valve
3. CH temperature probe 16. Filler cock
4. Boiler nozzles 17. 10 l/min flow-limiting device
5. Boiler 18. Cold water flow switch
6. Ignition/detection electrode 19. Cold water filter
7. Safety thermostat 20. Heating return temperature probe
8. Bi-thermal heat exchanger
9. Flue gas hood MCentral heating system flow
10. Flue thermostat CDomestic hot water output
11. Expansion vessel GGas inlet
12. Deaerator FCold water inlet
13. Circulation pump RCentral heating system return

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CTFS
1. DHW temperature probe 16 CH return temperature probe
2. Modulating gas valve 17. Expansion vessel
3. CH temperature probe 18. Circulation pump
4. Boiler nozzles 19. Filler cock
5. Boiler 20. Low water pressure switch
6. Ignition/detection electrode 21. 3 bar safety valve
7. Safety thermostat 22. 10 l/min flow-limiting device
8. Bi-thermal heat exchanger 23. Cold water flow switch
9. Sealed combustion chamber 24. Cold water filter
10. Flue gas extractor fan
11. Pressure measurement point on flue gas duct MCentral heating system flow
12. Flue gas circuit safety pressure switch CDomestic hot water output
13. Air intake and flue gas venting pipe GGas inlet
14. Pressure measurement point on flue gas duct FCold water inlet
15. Deaerator RCentral heating system return
24

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Availablepressure(mbar)
3.4 HYDRAULIC UNIT
The arrangement of the hydraulic unit is one of the main factors that allowed to
minimize boiler dimensions. All the parts in "contact" with water, such as 3 bar safety
valve, low water pressure switch and fill cock unit (see picture below) were all indeed
positioned inside circulation pump scroll.
Circulation pump has a fixed speed.
Circulation pump
characteristics:
Max. head: 5 m
Max. operating pressure: 6 bar
Max. circulation temperature:
3 bar safety
valve
Low water
pressure switch
Fill cock
unit
Cold water inlet flow
switch
Wilo circulation
pump
Deaerator
Availablepressurecurve
Flowrate(l/h)

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3.4 BI-THERMAL HEAT EXCHANGER
Bi-thermal heat exchanger allows
reducing consumption as well as waiting
times during domestic hot water production,
without any need of a plate heat exchanger
.
It consists of two (inner and outer) copper
circuits. The first one, oval-shaped, is to be
used by the CH system only; while the
second one, diamond-shaped, is dedicated
to the DHW circuit. This shape (see picture
below) has been especially designed to
eliminate any limestone deposit and noise problems.
To this end, only three of the four contact points of the inner pipe are welded to the circuit,
while the other one is left "free". Metal parts movement thus prevents limestone from
depositing and obstructing ducts, by reducing at the same time any noise originated by
thermal expansion.
In addition, heat exchanger outer finning allows a uniform temperature all over the surface.
Circulation pump is enabled only during CH operation, while it is stopped during DHW
operation in order to ensure a greater heat exchange to the inner circuit. This is the reason
why, we talk about still water (AF) boiler.
The connections between heat exchanger and pipes are ensured by special clips, as the
system is hydraulically sealed with OR seals on pipes.
WARNING: to replace heat exchanger, proceed as follows:
- remove combustion chamber front panel;
- remove expansion vessel;
- remove flue fan and hood;
- release sealing clips;
- remove exchanger working from above, and replace it;
- refit all removed parts, making sure to duly lubricate OR seals.
Bi-thermal heat
exchanger section:

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3.4 EXPANSION VESSEL
An increase of the heating water inside a closed circuit
corresponds to an increase of the water volume. As no further space is
available, it will not be water volume - but pressure - to increase. If
pressure value exceeds safety valve triggering point, this latter will open
and discharge water from system. This problem is prevented thanks to
an expansion vessel positioned inside circuit; vessel houses an air
diaphragm to be used to balance this overpressure.
Vessel capacity: 7 litres
3.5 FLUE GAS FAN
Compact boiler flue fan is of the asynchronous type. It is provided with a plastic
Pitot pipe to minimize the development of condensate on fan pressure measurement point,
and it is homologated to operate with the following models:
FIME NATALINI
Technical Characteristics:
Fime Natalini
Power supply 230 Vac
Power 38 W 35 W
Worm screw Die-casted Metal sheet
WARNING: due to flue diaphragm compatibility, Natalini fan can be replaced with Fime
fan, but not vice-versa.
Fime model only is thus supplied as a spare part.

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3.6 GAS VALVE
Boiler is homologated to operate with the following valve models:
SIEMENS VGU 56
SIT 845
GAS OUT
GAS IN
Gas inlet
pressure
t
Gas output
pressure
t
Min. pressure
adjuster screw B
Max. pressure
adjuster screw C
GAS OUT
GAS IN
Pressure
measurement
Min. pressure
adjuster screw B
Max. pressure
adjuster screw C
Pressure
measurement
it

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ELECTRICAL CONNECTIONS
SOLENOID VALVES SV1 and SV2
Gas valve characteristics
SIEMENS VGU 56 SIT 845
SV1 and SV2 safety coil operating power supply 230 VR AC 50_60 Hz 230 VAC 50 Hz
SV1 operating current 38 mA 40 mA
SV2 operating current 22 mA 12 mA
SV1 supply pin 4 - 5
SV2 supply pin 4 - 1
Modulation coil operating power supply 13.2 VDC 17 VDC
Max. working pressure 60 mbar
Working temperature -20 / 60 °C -15 / 60 °C
Modulating parameters
Gas modulation coil current at max. power 120 (methane) / 170 (LPG) mADC
Gas modulation coil current at min. power 20 (methane) / 30 (LPG) mADC
Gas modulation coil current at the end of ignition
ramping for CTN boilers 65% of max. current
Gas modulation coil current at the end of ignition
ramping for CTFS boilers 80% of max. current
Gas modulation coil current at the end of heating
rising ramping At max. heating power (P1)
Coils
Safety coil interchangeability No Yes
SV1 resistance value Not measurable (*) ~ 897 Ohm
SV2 resistance value Not measurable (*) ~ 6.77 KOhm
Modulation coil resistance value ~ 80 Ohm ~ 78 Ohm
(*) Diode bridge integrated inside gas valve
On CTFS models both valves feature a compensation pressure point connected to
the combustion chamber through a silicone tube.
Valve thus knows the pressure on nozzles and can supply the correct quantity of gas even
in case of overpressure or vacuum inside chamber.
Upon ignition, for example, when fan is activated a vacuum develops inside the
combustion chamber, and valve (thanks to this pressure point) decreases nozzle pressure
so as to balance any exceeding gas supply due to vacuum.
WARNING: solenoid valves are interchangeable, a single model can thus be stored at
your warehouse.