Nova Florida Fondital Delfis-Antea CTFS 24 User manual

DIDACTIC MANUAL
FAMILY: Wall-hung
atmospheric boilers
GROUP:
Instantaneous type
with
Forced Draught
MODELS: Delfis-Antea
Mono-thermal
VERSIONS: Indoor and built-in
installation
PART NO.: AST 14 C 261/00
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1st Edition, February 2013
ENGLISH

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2 AST 14 C 261/00
Contents
SECTION 01
TECHNICAL CHARACTERISTICS
1.1 – Models
1.2 – Overall Dimensions
1.3 – Technical Specifications ___________________Page 04
SECTION 02
CONTROL PANEL AND DIAGNOSTICS
2.1 – User's Interface
2.2 – LCD
2.3 – Boiler Status and Fault Codes ___________________Page 09
SECTION 03
HYDRAULIC DIAGRAMS AND COMPONENTS
3.1 – Hydraulic Diagram
3.2 – Hydraulic Unit
3.3 – Heat exchanger
3.4 – Expansion tank
3.5 – Flue gas fan
3.6 – Gas valve ___________________Page 14
SECTION 04
GAS SETTING AND PARAMETERS
4.1 – Gas Valve Setting
4.2 – Flue Cleaning Function
4.3 – Gas Conversion
4.4 – Parameters ___________________Page 21
SECTION 05
OPERATING LOGIC
5.1 – Main General Characteristics ___________________Page 29
SECTION 06
ELECTRICAL SYSTEM
6.1 – Electronic Board
6.2 – Electrical connections
6.3 – Wiring Diagram ___________________Page 55
SECTION 07
VENT DUCTS AND PIPES
7.1 – 100/60 Co-axial Air/Vent Ducts
7.2 – 80/80 Split Air/Vent Ducts
___________________Page 57
TABLE OF TECHNICAL FAULTS
___________________Page 61

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3 AST 14 C 261/00

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4 AST 14 C 261/00
SECT. 1
TECHNICAL CHARACTERISTICS
1.1 MODELS
Mono-thermal Delfis-Antea CTFS 24
ABBREVIATION KEY:
C : combined
TFS : forced draught, sealed chamber
MAIN CHARACTERISTICS:
Mono-thermal DELFIS-ANTEA CTFS 24: atmospheric boiler for indoor installation, combined instantaneous,
with production of domestic hot water + heating, forced draught, sealed chamber, mono-thermal with plate
exchanger;
1.2 OVERALL DIMENSIONS
Height H = 700 mm
Width L = 400 mm
Depth D = 250 mm

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5 AST 14 C 261/00
INDOOR INSTALLATION

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6 AST 14 C 261/00
INSTALLATION TEMPLATE

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7 AST 14 C 261/00
1.3 TECHNICAL SPECIFICATIONS
General Characteristics
CTFS 24
Operating parameters
Equipment category II2H3+
Burner nozzles no. 11
Minimum CH circuit flow rate l/h 550
CH circuit min. and max. pressure bar 0.5 and 3
DHW circuit min. and max. pressure bar 0.5 and 8
DHW specific flow rate (t 30°C) l/min 11.1
ON/OFF triggering temperature due to overheating °C 105 and 90
Air pressure switch ON/OFF pressure Pa 45 and 35
Central heating setting range °C 35 ÷ 78
Maximum CH working temperature °C 78 + 5
DHW setting range °C 35 ÷ 57
Maximum DHW working temperature °C 57 + 5
Total capacity of expansion vessel l 7
Maximum recommended system capacity (**) l 100
Nominal electrical data
Power supply: Voltage/Frequency V - Hz 230-50
Power mains supply fuse - 5x20mm 3.15 AF
Electric cabinet protection degree IP X4D
Max. absorbed power W 98
Electric power in standby condition W < 2
Overall dimensions and connections
Height mm 700
Width mm 400
Depth mm 250
Net weight (without packaging) Kg 25.0
Gas connection - G ½
Flow and return connection - G ¾
Cold water and hot domestic water connection - G ½
Consumption
Natural gas consumption (*) m3/h 2.7
Butane gas consumption (*) kg/h 2.0
Propane gas consumption (*) kg/h 1.98
Operating characteristics
Type of ignition - Electronic
Flame surveillance - Ionisation
Recommended ionisation current µA 2
Type of detection - Non-polarised
Ignition attempt at "cold" system No. 5
Max. number of resume attempts from remote No. 5
(*) Value related to 15°C - 1013 mbar condition
(**) Maximum water temperature at 83°C, tank preloaded at 1 bar

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8 AST 14 C 261/00
Design data and flue sizing
CTFS 24
Pmax. Pmin.
Load
at 30 %
Casing heat loss % 1.01 2.04 -
Flue system heat loss with burner on % 5.89 10.26 -
Flue (natural gas) mass flow g/s 14.18 15.21 -
Flue gas temp. – air temp. °C 98 79 -
CO2 value (natural gas - butane gas - propane) % 6.8/8.0 – 7.7 3.0/3.6 – 3.5 -
Boiler efficiency rating % 93.0 88.7 90.4
Efficiency rating
(according to 92/42/EC) - ★★★
Nox emission class - 3
Settings
CTFS 24
Heat
capacity Heat output MIN-MAX
Supply
pressure Diameter Nozzles Burner pressure MIN-MAX
(kW) (kW) (mbar) (mm) (mbar)
Natural gas
G20 25.5 11.1 – 23.7 20 1.35 3.1 – 11.8
butane gas
G30 25.5 11.1 – 23.7 29 0.78 7.2 – 29.0
propane gas
G31 25.5 11.1 – 23.7 37 0.78 9.6 – 36.6

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9 AST 14 C 261/00
SECT. 2
CONTROL PANEL AND DIAGNOSTICS
2.1 USER'S INTERFACE
1. Set domestic hot water
temperature
These keys are used to set
(increase or decrease) the
domestic hot water temperature
within a range from 35°C to 57°C.
2. Recall information and confirm parameters
This key is used to scroll the sequence of the values
of some parameters (see following paragraphs). It is
also used to access and confirm the edited
parameters setting.
3. Select boiler state
Press this key to set the following functions:
SUMMER :
Boiler produces domestic hot water, only.
WINTER :
Boiler provides both central heating and domestic hot
water.
CENTRAL HEATING ONLY :
Boiler provides central heating water only.
STANDBY OFF:
Boiler in standby mode: central heating and DHW functions are disabled.
4. Resume boiler function
This key enables to resume boiler operation after a shut-down.
5. LCD Display
The LCD shows the boiler status and operation information (see the following paragraph).
6. Set central heating water temperature
Without external probe, this key is used to set the water temperature value of the heating system
between a minimum value of 35°C and a maximum value of 45°C (reduced range) or 78°C
(standard range). With external probe, instead, it is used to set the fictitious temperature (see paragraph
about thermoregulation).
7. Water pressure gauge
This shows the pressure of the water in the heating system.

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10 AST 14 C 261/00
2.2 LCD
a. Flue cleaning function indicator
It illuminates flashing when the flue cleaning function is
enabled by pressing keys 2and 4at the same time (see
previous paragraph). When this function is ON, boiler flow
temperature and the current supplied to the modulation coil
are displayed.
b. DHW indicator
This comes on when the boiler is in DHW mode.
It flashes when setting the DHW temperature with the keys 1 (see previous paragraph).
c. Parameter editing indicator
It comes on when entering into the parameter setting mode (in this case the symbol n turns on at the same
time n).
d. First alphanumeric indicator
Alphanumeric values indicating:
- flow water 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.
e. Central heating indicator
This comes on when the boiler is in CH mode.
Flashes when setting the CH temperature with adjuster 6 (see previous paragraph).
g. Fictitious room temperature indicator
When an external probe is installed, this indicator flashes when the fictitious room temperature is
set via buttons 6.
h. Solar pump enabling indicator
This icon illuminates every time the solar pump is enabled only by adding the supplementary board to
manage the solar plant.
i. Boiler status indicator
The icons indicate the operating modes enabled:
SUMMER: only the icon is lit
SUMMER and WINTER: both icons are lit
CENTRAL HEATING ONLY: only the icon is lit
l. Flame lighting indicator
It turns on upon detecting burner flame lighting.
m. Second alphanumeric indicator
Figures to view and edit parameters.
It indicates the working burner current power rate.
n. Parameter indicator
It turns on when entering the parameter programming mode.
h

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11 AST 14 C 261/00
2.3 BOILER STATUS AND FAULT CODES
Normal operation
Boiler in STANDBY mode.
Boiler in SUMMER mode.
No active function.
The flow temperature is displayed
Boiler in SUMMER or WINTER mode.
No active function.
The flow temperature is displayed
Boiler in CENTRAL HEATING ONLY mode.
No active function.
The flow temperature is displayed
Boiler in SUMMER mode
DHW function active with flame lit.
The hot domestic water temperature and the burner power
rate percentage are displayed.
Boiler in SUMMER or WINTER mode.
DHW function active with flame lit.
The hot domestic water temperature and the burner power
rate percentage are displayed.
Boiler in SUMMER or WINTER mode.
CH function active with flame lit.
The flow temperature and the burner power rate percentage
are displayed.
Boiler in WINTER mode.
CH function active with flame lit.
The flow temperature and the burner power rate percentage
are displayed.
Malfunction, errors to be reset by user and self-resettable faults
The display indicates the fault through the relevant error code (see following table). Some
of such faults can be reset by the user pressing the "rest" key (r), some others are self-
resettable (a):

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12 AST 14 C 261/00
Boiler shut-down due to missing flame (r)
Boiler shut-down due to double flow probe triggering (r)
Boiler shut-down due to flue gas pressure switch triggering (r)
Boiler shut-down due to low water pressure switch
triggering (a)
Boiler shut-down due to double flow probe fault (a)
Boiler shut-down due to DHW probe fault (a)
External probe fault (a)
Solar collector probe fault (SCS) (a)
Solar valve probe fault (SVS) (a)
Solar water heater probe fault (SBS) (a)
Remote control connection fault (a)
Triggering of safety thermostat in mixed zone 2 (a)
Mixed zone flow probe fault (a)
(with indication of the zone number)
Communication failure between supplementary boards (a)
Hydraulic configuration not allowed(a)
Shut-down due to fan safety circuit hardware fault

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13 AST 14 C 261/00
Shut-down due to gas valve safety circuit hardware fault
Air pressure switch recognition failure
Modulation coil fault (a)
Max. number of reset attempts from remote reached (r)
NOTE: The board is able to count and store the boiler's latest five faults (both resettable and self-
resettable). View them by scrolling the parameters from P51 to P55.
The display back-lighting works as follows:
illuminates steadily when the boiler keys are enabled;
It illuminates flashing (3 seconds ON and 2 OFF) when a shut-down or a fault
occurs.

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14 AST 14 C 261/00
SECT. 3
HYDRAULIC DIAGRAMS AND COMPONENTS
3.1 HYDRAULIC DIAGRAM
CTFS
1. Automatic by-pass 15. Expansion tank
2. DHW probe 16. 3-bar safety valve
3. Motorised 3-way valve 17. Deaerator
4. Modulating gas valve 18. Minimum pressure switch
5. Burner 19. Circulation pump
6. CH temperature probe 20. 10l/min flow rate limiting device
7. Ignition/detection electrode 21. Filler cock
8. Mono-thermal exchanger 22. Cold water flow switch with filter
9. Sealed combustion chamber
10. Flue gas extractor fan MCH system flow
11. Flue gas circuit safety pressure switch CHot water outlet
12. Pressure measurement point on flue gas duct GGas inlet
13. Air intake and flue gas venting pipe FCold water inlet
14. Pressure measurement point on flue gas duct RCH system return

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15 AST 14 C 261/00
3.2 HYDRAULIC UNIT
MOTORISED THREE-WAY VALVE
The boiler uses a three-way valve to divert the water flow coming from the primary
exchanger into another pipe, in particular it diverts the water into the secondary (plate)
exchanger, where heat will be transferred to the DHW.
This valve consists of one main three-way body, one plastic (thermosetting polymer)
cartridge, and one electric motor (actuator) to move the internal shutter.
The secondary exchanger is fixed by the three-way valve and another unit made of
thermosetting polymers connecting the cold water inlet pipe to the rest of the hydraulic
system.
The plate exchanger consists of 12 plates made of stainless steel and the high production
of domestic hot water is guaranteed by the horizontal expansion of the exchanger itself.
When hot domestic water is required, the cold water coming from the hot domestic water
system passes through the flow switch setting the boiler to "DHW" mode. Then the three-
way valve diverts the hot water coming from the primary exchanger into the secondary one
so that it can transfer its heat to the plates for the instantaneous production of domestic
hot water.
N.B. In rest condition, the three-way valve is in DHW mode position.
Electric
motor
Water inlet from primary
exchanger
Outlet to plate
exchanger
Flow
MOTOR CONNECTIONS
ELECTRICAL
1 Line 1
Central heating
2 Neutral
DHW
3 Line 2

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16 AST 14 C 261/00
Three-way valve section:
The boiler is fitted with an internal automatic by-pass with non-return valve, whose opening
threshold is 400 mBar.
In case of load losses in the system due to thermostatic valve triggering, the by-pass
ensures a minimum flow rate inside the primary exchanger. The function of the by-pass is
to protect the primary exchanger from overtemperatures due to poor water flow.
COLD WATER
D.H.W.
By-pass pipe with non-
return valve
FLOW RETURN
Low water
pressure switch
Safety valve
3 bar
Expansion vessel
connection
SHUTTER
CARTRIDGE
IN THERMOSETTING
POLYMERS
3-WAY STATUS
DHW
Shutter upwards
Actuator piston in rest
position
Central heating
Shutter downwards
At t it i ki
ACTUATOR

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17 AST 14 C 261/00
One of the main factors which has helped to minimise the dimensions of the compact
boiler consists in the collocation of the hydraulic unit. All components in "contact" with the
water have been put together inside the circulation pump volute, including the 3-bar safety
valve, low water pressure switch and the filler cock unit.
As can be noted from the diagram below regarding the residual head values, the
circulation pump is at a fixed speed:
DHW FLOW SWITCH
The domestic hot water flow switch features a magnet switch whose position determines
the minimum quantity of hot domestic water necessary to start the boiler (3 l/min ON and 1
l/min OFF). If the request of DHW does not exceed such value the micro-switch does not
close the contact and inhibits the boiler starting to avoid the boiling risk.
A flow rate limiting device (flow regulator) is placed at the flow switch outlet. The former
determines the litres/minute that can be drawn at t 30K:
Maximum head:5 m
Max. operating pressure:6 bar
Max. circulation temperature
:
Flow regulator:
- 24 kW, 10 l/min regulator

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3.3 HEAT EXCHANGERS
PRIMARY EXCHANGER
It is made up of a set of copper pipes, connected to each other in a way to create a "coil".
The finning improves the efficiency of the heat exchange between the water flowing inside,
the heat developed by the burner flame and the hot combustion flue gases.
The heat exchanger and the pipes are connected by means of special clips. Hydraulic
sealing by pressure is ensured by O-rings applied to the specific pipes.
Warning: to replace the heat exchanger, proceed as follows:
- remove combustion chamber front panel;
- remove the expansion tank;
- remove fan and flue gas hood;
- release the retaining clips;
- pull the exchanger upward to replace it;
- refit all components, lubricate O-ring with care.
SECONDARY EXCHANGER
It is made up of a number of overlaying metal plates. In the spaces between the plates, the
hot water coming from the CH circuit and the DHW system cold water flow simultaneously
in separate circuits.
The hot water will transfer its heat to the DHW system cold water. Therefore, at the outlet,
the DHW will be warmer and the CH water (primary circuit) will be cooler.
12 plates

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3.4 EXPANSION TANK
An increase in heating water temperature inside a closed circuit
corresponds to an increase in the water volume. As no further space is
available, the increase will affect the pressure and not the volume. If
pressure value exceeds safety valve triggering point, this latter will open
and discharge water from the 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.
The expansion tank is placed vertically on the right side of the boiler.
Tank capacity: 7 litres
3.5 FLUE GAS FAN
The flue gas fan is of asynchronous type and is fitted with a Pitot plastic pipe, which
limits the condensate build up on the fan pressure measurement point and is approved for
operating with the following models:
FIME NATALINI
Technical characteristics:
Fime Natalini
Power supply 230 Vac
Power 38 W 35 W
Worm screw Die-cast Sheet metal

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20 AST 14 C 261/00
ELECTRICAL CONNECTIONS
SOLENOID VALVES EV1 and EV2
3.6 GAS VALVE
The boiler is approved for operating with gas valve, model SIT 845:
Gas valve characteristics
EV1 and EV2 safety coil operating power supply 230 VAC 50 Hz
EV1 operating current 40 mA
EV2 operating current 12 mA
EV1 supply pin 4 - 5
EV2 supply pin 4 - 1
Modulation coil operating power supply 17 VDC
Max. operating pressure 60 mbar
Working temperature -15 / 60°C
Modulation parameters
Current of gas modulation coil at maximum output 120 (natural gas) / 170 (LPG) mADC
Current of gas modulation coil at minimum output 20 (natural gas) / 30 (LPG) mADC
Current of gas modulation coil at the end of the
ignition ramp 80% of maximum current
Current of gas modulation coil at the end of the
heating rising ramp At maximum CH output (P7)
Coils
Safety coil interchangeability Yes
EV1 resistance value ~ 1600 Ohm
EV2 resistance value ~ 6.77 KOhm
Modulation coil resistance value ~ 78 Ohm
The valve features a compensation pressure point connected to the combustion
chamber through a silicone pipe.
Valve thus knows the pressure on nozzles and can supply the correct quantity of gas even
in case of overpressure or vacuum inside the chamber.
For example, upon ignition when fan is activated, a vacuum develops inside the
combustion chamber. Thanks to this pressure point, valve decreases nozzle pressure so
as to balance any exceeding gas supply due to vacuum.
GAS OUT
GAS IN
Gas inlet
pressure
t
Gas outlet
pressure
t