E.C.A. Confeo Premix CP 24 HST Operation instructions

High-efficiency Condensing Boilers (compatible with external DHW tank)
Confeo Premix CP 24 HST Confeo Premix CP 30 HST
24 kW Central Heating Output 30 kW Central Heating Output
26 kW Domestic Hot Water Output 31 kW Domestic Hot Water Output
INSTALLATION AND USER’S OPERATING
INSTRUCTIONS

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CONTENTS
PREFACE
GUARANTEE & SERVICE
SYMBOLS’ DEFINITIONS
SAFETY INSTRUCTIONS AND WARNINGS
PRODUCT
General Specifications
Product Notation
Technical Data
BOILER PACKAGING
INSTALLATION
Selection Of The Boiler Location
Mounting The Boiler
CONNECTIONS
Condensate Connection
Flue Connection
Gas Supply & Water Systems
Electricity Supply
COMMISSIONING
Final Checks And Operations Before Boiler Start-up
Control Panel
Operating The Boiler
Combustion Check & Gas Valve Adjusments
GAS TYPE CONVERSION
FAULT & FAILURE FINDING
MAINTENANCE
STANDARDS AND REGULATIONS
APPENDIX

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PREFACE
Confeo Premix high-efficiency condensing boilers have been designed for providing efficient, safe
and comfortable central heating (CH) and domestic hot water (DHW). The boilers are suitable for
room ventilated or room sealed operation and are supplied for use with either natural gas or LPG.
This manual contains installation and user’s operating instructions. The detailed information about
technical data, selection of the boiler location, fitting the connections (water systems, gas supply,
flue connection and electricity supply), maintenance and fault & failure finding are placed in your
manual. Please read the instructions carefully for operating the boiler a long time period and to
maximize benefit from the boiler specifications.
Please keep all your documents safe.
GUARANTEE & SERVICE
The appliance has guarantee period against faulty workmanship or material in condition that the
instructions and precautions in this manual must be obeyed. The service operations and general
maintenance must be carried out only by qualified person.
The warranty certificate must be registered by Service in the installation day.
Your appliance need not any repairs if operated according to this manual. For assistance or
additional information, consult qualified person, installer or gas supplier.
SYMBOLS’ DEFINITIONS
The symbols have been placed on particular points to make some instructions more noticeable. The
symbols’ definitions are described as follows:
- CAUTION: Property damage and/or non-severe injury can happen.
- WARNING: Severe injury or death can happen.
: The important explanations to be considered by users.
: The situations that can only be interfered by qualified person.

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SAFETY INSTRUCTIONS AND PRECAUTIONS
Safety Instructions
When a gas leak is found or suspected:
- Turn off the gas valve of the boiler and other appliances which operate with gas.
- Shut off the oven, cooker and similar appliances to put their flame out.
- Do not light match, lighter etc. and put cigarette out.
- Allow fresh air into the room by opening doors and windows.
- Do not touch the electrical appliances’ switches and plugs.
- Turn off gas supply at the gas meter.
- Do not use telephones in the environment where a gas leak is suspected.
- Call your qualified person as soon as possible.
Do not place and use flammable and explosive liquid or materials around the boiler.
Keep soap and water solution away from electrical connections during cleaning, gas leak test etc.
Do not block air vents, openings made in the walls of the room, which provide fresh air to the
installation room.
Do not lay the LPG container down.
Water Systems & Gas Supply Line
Before installation of the boiler, the water systems (CH and DHW circuit) and gas supply line
must be completed in accordance with the relevant regulations and standarts by user.
Gas Type Conversion
The appliance should be purchased depending on operating gas type. In case of a demanding gas
type conversion, this is made with charge.
Gas type conversion from LPG to natural gas or from natural gas to LPG must be carried out
only by qualified person. After gas type conversion, gas leak test must be performed by qualified
person.
Maximum pressure regulator must be sealed and the self-adhesive conversion label must be
placed on the boiler after gas type conversion.
Installation
The boiler must be installed in accordance with national and local requirements, gas safety
regulations, relevant standarts and this manual by qualified installer.
The appliance should be mounted against a closed wall.
The appliance must be positioned so that the plug is accessible.
The appliance should not be positioned having a direct contact to steam or gases.
Any change of flue position must not be made without consulting qualified person.
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3
4

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Boiler Start-up
Boiler start-up must be performed certainly by qualified person.
Gas type (natural gas / LPG), gas supply pressure (mbar) and electricity supply voltage (V) data
which are detailed on the information plate must be suitable with mains supply conditions. This is
checked by qualified person.
Before connecting the flue, siphon must be filled with water to prevent the risk of flue gases
escaping into the installation room.
Lubricate the internal parts of the seals before the assembling of the air / flue ducts.
After boiler start-up, you should request information about operating the boiler and safety
precautions from qualified person.
Operating The Boiler And Maintenance
Read carefully instructions and precautions in this manual against wrong usage which causes
unsafe conditions.
The boiler should be checked and serviced for general maintenance once a year. Maintenance
and service operations must be carried out only by qualified person.
Only a damp cloth should be used for cleaning the outer surface of the boiler and then the
surfaces should be dried completely. Do not use chemical subtances or solutions which cause rust
and scratches in your appliance.
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PRODUCT
General Specifications
Confeo Premix high-efficiency condensing boilers have been designed for providing efficient, safe
and comfortable central heating (CH) and domestic hot water (DHW). The boilers are suitable for
room ventilated or room sealed operation and are supplied for use with either natural gas or LPG.
Main board provides all the functionality and safety of the boiler. The board drives gas valve, fan,
pump and 3-way valve. Flame in the burner is checked regularly.
Control panel has been designed ergonomically. It provides user friendliness. Display panel has
blue backlight LCD Display and 3 Yellow Status LEDs. Operation modes, actual and setpoint CH
temperature, setpoint DHW temperature, error codes and CH water pressure value can be seen on
LCD display.
The safety systems in your appliance provide entire safety for you and your appliance. The safety
systems are:
Flue Gas Over-heat Safety System (105 0C)
Flame Failure Safety System
Boiler Over-heat Safety System (2 levels: 95 0C and 105 0C)
DHW (Domestic Hot Water) Over-heat Safety System
High Water Pressure Protection System (3 bar)
Low Water Pressure Protection System (0,6 bar)
High Voltage Protection System (260 VAC)
Low Voltage Protection System (160 VAC)
EMC (Electromagnetic Compatibility) Filter
Thermal Accumalation Protection System (with by-pass circuit and “pump over-run”)
Frost Protection System (The appliance must be on stand-by to activate the frost protection)
Water Flow Supervision
Pump Dry Run Protection System (0,4 bar)
Pump Anti-sticking Function
3 Way Valve Anti-sticking Function
Automatic Air Vent
Expansion Vessel (10 liters)

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1- Stainless steel heat exchanger 12- Igniter
2- Air / gas manifold 13- Ignition electrodes
3- Fan 14- Ionization electrode
4- Pump 15- Flue gas NTC sensor
5- Hydraulic circuit – flow manifold 16- Hydraulic circuit – return manifold
6- Gas valve 17- Manual air vent
7- Water pressure sensor
8- CH flow NTC sensor – immersion type
19- Expansion vessel (10 liters)
9- CH return NTC sensor – surface type
20- Siphon
10- Thermal cut-off 160 0C
21- DHW tank flow pipe
11- Air / gas mixer
22- DHW tank return pipe

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Product Notation
Table 1
Notation Description
CP 24 HST
Confeo Premix High-efficiency Condensing Boilers
- 24 kW Central Heating Output
- 26 kW Domestic Hot Water Output
CP 30 HST
Confeo Premix High-efficiency Condensing Boilers
- 30 kW Central Heating Output
- 31 kW Domestic Hot Water Output
Technical Data
Confoe Premix high-efficiency condensing boilers are suitable for room ventilated (B Type) or
room sealed (C Type) operation.
C type boilers (C13(x), C33(x), C43(x), C53(x), C63(x), C83(x)) are air independent gas appliances. Required
fresh air for combustion is provided independently from the installation room by the air supply
ducts and products of combustion is discharged by the flue gas ducts.
B type boliers (B23, B33) are room air dependent gas appliances. Combustion air is provided from
the installation room and products of combustion is discharged by means of the flue gas ducts.

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Table 2 CP 24 HST CP 30 HST Unit
Gas Category*
Boiler Type
Type of gas
Performances
CH Min. Heat Output (80/60 0C)
CH Max. Heat Output (80/60 0C)
CH Min. Heat Output (50/30 0C)
CH Max. Heat Output (50/30 0C)
CH Min. Heat Input
CH Max. Heat Input
DHW Min. Heat Output
DHW Max. Heat Output
DHW Min. Heat Input
DHW Max. Heat Input
Gas Consumption**
Natural Gas (Max. Load)
Natural Gas (Min. Load)
Propane (Max. Load)
Propane (Min. Load)
Gas Supply Pressure
Natural Gas (G 20)
Propane (G 31)
Domestic Hot Water
Set Temperature Range
Central Heating
Min. Operating Pressure
Max. Operating Pressure
Set Temperature Range
General
Electrical Supply
Electrical Power Consumption
Expansion Vessel
Dimensions (HxWxL)
Weight (Net)
II 2H3P
B23, B33
C13(x), C33(x), C43(x),
C53(x), C63(x), C83(x)
II 2H3P
B23, B33
C13(x), C33(x), C43(x),
C53(x), C63(x), C83(x)
kW
kW
kW
kW
kW
kW
kW
kW
kW
kW
m3/h
m3/h
kg/h
kg/h
mbar
mbar
oC
bar
bar
oC
VAC/Hz
watt
ltr
mm
kg
G 20
6,6
22,2
7,3
24
6,8
22,8
6,7
26
6,8
27
G 31
7,9
22,2
8,8
24
8,2
22,8
8
26
8,2
27
G 20
8,1
27,3
9
30
8,4
28
8,2
31
8,4
32
G 31
9,6
27,3
10,8
30
10
28
9,7
31
10
32
2,38
0,71
1,77
0,64
20
37
35-60
3
30-80
230V AC- 50Hz
115
10
750x454x365
42,6
2,92
0,88
2,17
0,77
20
37
35-60
3
30-80
230V AC- 50Hz
115
10
750x454x365
43
*the following gas categories can also be used
CP 24 HST - CP 30 HST
Gas Category
II
2L3P
, II
2L3B/P
, II
2H3B/P
, II
2H3+
, II
2Esi3+
II 2ELL3B/P, II 2ELL3P, II 2E+3P, II 2E+3B/P, II 2E+3+ ,II 2Esi3P
**For gas consumption calculation; Natural gas: Hu=9,59 kWh/m3
Propane: Hu=12,91 kWh/kg

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fig. 1
agram

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BOILER PACKAGING
CAUTION: The instructions on the boiler package should be considered during
transportation and storage.
- The product is covered with a cardboard box of which dimensions are 867x522x447
(HxWxL) mm and supported by upper and lower styrofoams (fig. 2a).
a) b)
fig. 2
The required parts (Wall bracket, 4 pieces gasket for water and gas connections and screews) for
installation of the boiler are put into the upper styrofoam (fig. 2b). The other parts which seen in the
fig.2b are optional. The optional parts are:
a) Mounting bracket
b) CH connecting pipes (3/4’’, 2 pieces)
c) Water supply pipe (1/2’’, 1 piece)
d) Gas supply pipe (3/4’’, 1 piece)
e) Nipples (1/2’’, 1 pieces – 3/4’’, 3 pieces) which are held with spring clips.
h) 2 pieces ½” gasket, 6 pieces ¾” gasket for water and gas connections.

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b)
a)

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INSTALLATION
Selection Of The Boiler Location
The boiler must be installed in accordance with gas safety regulations and relevant standards.
Additionally, the clearances around the boiler should be as shown in fig. 4 in order to make service,
maintenance and usage easier.
Fig. 4 indicates minumum clearances from the ceiling and the sides.
a) b)
fig. 4
WARNING: The appliance must be positioned so that the plug is accessible.
- The appliance should be mounted against a closed wall.
- The outer surface of the boiler do not exceed 85 oC in maximum running mode so do not take
additional precautions againts constructional materials (combustible materials).

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WARNING: For room sealed operation, the boiler location and air/flue terminal
position must obey national and local requirements, gas safety
regulations and relevant standarts.
The room sealed operation boiler is not suitable for external installation. It should be within in
the building.
- In case of gas leakage, it is necessary to vent the installation room according to national and local
requirements, although the room sealed opearation boilers are independent of room volume and
ventilation.
WARNING: Do not block the air vents which provide fresh air to the installation room.
The air/flue terminal must be exposed to the external air and allow free passage of air cross it at
all times.
- The minumum acceptable dimensions from the terminal to obstructions and ventilation openings
must obey national and local requirements.
- All horizantally fitted ducts (air/flue) should be fitted at a slight 20or 30upwards incline to allow
condensate water drain to the boiler.
:The flue ducts are always wet.
:In cold or humid weather, water vapour in the flue gas may condense
while leaving the flue terminal.

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WARNING: For room ventilated operation, the boiler location and flue gas discharge
connections must obey national and local requirements,gas safety
regulations and relevant standarts.
Room ventilated operation boilers must not be installed in a bedroom, bedsitting room,
bathroom or in a room containing a bath or shower and also the installation room must not contain
inflammable or explosive liquid or materials. The boiler should not be installed in rooms with high
level of dust or humidity.
General requirements for the installation room of the room ventilated boilers: The installation
room must have 1 m3volume for each 1 kW heat output. Therefore, The installation room must
have 24 m3volume at least for boilers of 24 kW heat output (fig. 5a). Also, a permanent air vent
connected to external air with cross-section area of 150 cm2is required.
- If volume of the room is less than 1m3/kW that means the volume is less than 24 m3for boilers of
24 kW heat output, 2 additional permanent air vents connected to adjacent room with cross-section
areas of 150 cm2are required, one at high level and one at low level. The adjacent room must not be
a bathroom, bedsitting room or bedroom. The total volume of the installation room and the adjacent
room must be more than 24 m3as well. The additional air vents should be on the same wall (fig. 5b).
WARNING: Do not block the air vents which provide fresh air to the installation room.
a) Volume of installation room ≥1m3/kW b) Volume of room represented by 1≤1m3/kW
Total volume of rooms 1and 2≥1m3/kW
(installation room is represented by 1)
(adjacent room is represented by 2)
fig. 5 (please see also fig.18)

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Mounting The Boiler
Having determined the boiler location,
- Use the paper template to mark out the positions of the fixing holes of wall and mounting brackets
(the mounting bracket is an optional part).
- Drill the wall and fix the wall bracket to the wall with the 3 screws, then also the mounting bracket
with the 2 screws.
- Hang the boiler up on the wall bracket.
a) b)
fig. 6

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CONNECTIONS
Condensate Connection
:All condensing boilers generate condensate discharge. The amount of
condensate water depends on the working conditions of your appliance.
This can be up to 1,7 litres of condensate water an hour.
- A plastic pipe should be fixed to the outlet pipe of the siphon and the pipe should be connected to
the drain line.1) If National and local requirements do not allow this such a connection, the
outlet pipe of the siphon should be open connection and should not be closed/blocked.
- If the pipe work is not terminated within the building, the pipe must be insulated against freezing.
- The connecting pipes and the fittings must be made of plastic material only.
- All horizontal pipes must be connected at a slight 20or 30downwards incline to ensure a good
flow.
Before connecting the flue, pour approximately 1 liter of water into the flue gas outlet to fill the
siphon (fig. 7). This prevents the risk of flue gases escaping into the insallation room.
WARNING: Before connecting the flue, siphon must be filled with water to prevent
the risk of flue gases escaping into the installation room.
fig. 7
1) National and local requirements should be take into consideration.

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Flue Connection
4 different types of air/flue system can be designed for Confeo Premix high-efficiency
condensing boilers:
a) The air/flue system is designed by horizontal concentric ducts
b) The air/flue system is designed by vertical concentric ducts
c) The air/flue system is designed by two separate ducts (twin connection)
d) Room ventilated operation (air supply from boiler room)
: The air/flue kit, given with your appliance, is only suitable for
horizontal air/flue design. For the other types, you should order
required accessories from qualified service.
Connection by horizontal concentric ducts
- The concentric vertical adapter (φ80/125mm) allows the 900Concentric elbow (φ80/125mm) 3600
free rotation (fig. 8).
- The standard horizontal air/flue kit parts shown in fig. 3.
:All horizontally fitted ducts (air/flue) should be fitted at a slight 20
or 30upwards incline to allow condensate water drain to the boiler.
fig. 8
a

18
fig. 9
(
(
(

19
fig. 10
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(B) for CP 24 HM-P
4 m for CP 30 HM-P and 5 m for CP 35 HM-P models.