Centrometal EKO-CK P 20 User guide

CENTROMETAL d.o.o. - TVRTKA ZA PROIZVODNJU ENERGETSKIH UREĐAJA
40306 MACINEC –GLAVNA 12 –HRVATSKA
tel: [phone]; fax : [phone]
TECHNICAL INSTRUCTIONS
USE AND MAINTENANCE
Cm Pelet-set
(14-35 kW)
For boilers:
EKO-CK P 20-40 (EKO-CK 20-40)
EKO-CKB P 20-40 (EKO-CKB 20-40)
TUPS-K-11-2016-E-N-ENG

Technical instructions Cm Pelet-set
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CONTENTS
1. Introduction....………………………………………………………………………………….……….....
2. Status of delivery.……………………….....…………………………………………........………........
3. Component description and technical information.…………………………………………..............
4. Safety elements..……………………………………………………………………………………........
5. Fuel....……………………………………………………………………………………………………...
6. Boiler control unit...………………………………………………………………………….…………....
6.1. Description of buttons and symbols on the control unit.……………………………….....
6.2. Symbol description....…………………………………………………………………….......
6.3. Home screen and sanitary water temperature....……………………………………….....
6.4. Setting of burner operating parameters.……………………………………………...........
7. Burner operation...…………………………………………........…………………………………….....
7.1. Procedure of the first firing………………………………………...…………………..........
7.2. Extinction procedure.…………………………………………………………………...........
8. Control unit operation.…………………………………………………………...........………………....
8.1. Firing phase....…………………………………………………………………………….......
8.2. Transition phase...………………………………………………………………………........
8.3. Operation phase.…………………………..……………………………………………….....
8.4. Extinction phase.………………………..………………………………………………........
8.5. Operation with timer...……………………………………………………………………......
8.6. Anti-frost protection programme............…………………………………………………....
8.7. Boiler overheating protection.……………………………………………………….............
8.8. Flame goes out during operation.....…………………………………………………..........
8.9. Power supply interruption.……………………………………………………………...........
8.10. Operation of the regulation in OFF mode / boiler firing with solid fuel.........................
9. Errors....…………………………………………………………………………………………………....
9.1. Errors and possible causes....…………………………………………………………….....
10. Connectors at control unit....…………………………………………………………………………...
11. Maintenance of Cm Pelet-set....…………………………………………………………………….....
12. The possibility of fan lid installing……………………………………………………………………...
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Technical instructions Cm Pelet-set
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1. Introduction
Cm Pelet-set, wood pellet based heating system (nominal burner output of 14 kW and from 20 to
35 kW) designed for installation in combined boilers or biomass firing boilers EKO-CK P (EKO-CK)
and EKO-CKB P (EKO-CKB), with thermal output from 20 to 40 kW. These technical instructions
provide basic product information, its technical characteristics and instructions on use and
maintenance of its components. Cm Pelet-set components are of modern design and construction,
made of high quality materials having all required certificates. Cm Pelet-set installation and start-up
must be carried out by a professional or authorized fitter of manufacturer.
Instructions for fitters/servicemen presenting setting of all parameters of pellet regulation are also
supplied with these instructions.
2. Status at delivery
1. Pellet burner CPPL-14 or CPPL-35
2.a.) Set for installation of pellet burner (only new boiler models)
2.b) Lower boiler door CPDV (only for models that have special doors for installation of pellet
burner)
3. Boiler control unit CPREG
4. Pellet feeder CPPT
5. Pellet tank CPSP
2.1 Pellet burner CPPL
Pellet - burner CPPL 14 (nominal thermal output of 14 kW, for boiler EKO-CK P 20 (EKO-CK 20) and
EKO-CKB P 20 (EKO-CKB 20)) and CPPL-35 (nominal thermal output of 20 to 35 kW, for boilers
EKO-CK P 25-40 (EKO-CK 25-40), EKO-CKB P 25-40 (EKO-CKB 25-40)) consists of high quality
components and made of certified built-in materials. The burner includes high-efficiency fan which, by
aid of specially shaped burner grate creates a flame as in standard burners. The burner also includes
electrical heater which, via the control unit, automatically ignites pellets when required. A built-in
photo-cell serves for flame detection in the burner. Special shape of a combustion chamber enables
good mixing of air and fuel which gives high efficiency of combustion. CPPL-14 burner has additional
ceramic nozzle which improves fuel combustion. Depending on the operating phase and set output,
fan revolution number, i.e. air supply to the chamber is changed. The burner is designed for
installation into prepared openings at the lower boiler door CPDV. The burner is factory wired and it
has to be connected to the boiler control unit CPREG.
2.a) Set for installation of pellet burner (only new boiler models)
At the current lower boiler door is necessary to upgrade the bracket for pellet burner installation.
2.b) Lower boiler door
Lower boiler door CPDV with an opening adapted for pellet burner is supplied with the pellet burner
CPPL (except in case of supply of a boiler with Cm Pelet-set, when the lower boiler door CPDV is pre-
installed onto boiler). Standard boiler door has to be dismantled from the boiler instead of which the
supplied boiler door CPDV is installed onto which the pellet burner is assembled.
2.3 Boiler control unit CPREG
Sophisticated digital boiler control unit CPREG controls the burner in accordance with the need for
heating and sanitary water. Characteristics of the boiler control unit CPREG: microprocessor control,
bimetal safety thermostat, safety pressure switch, micro switch for lower boiler door, control unit turns
on and off the burner according to set temperatures and operation regimes, regulates pellet supply by
the feeder, operation in winter or summer regime, boiler protection against condensation, display the
boiler current status on the screen, error messages on the screen, with boiler sensor and sanitary
water sensor supplied. Operation and setting of individual parameters are described in details
hereinafter.

Technical instructions Cm Pelet-set
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2.4 Pellet feeder CPPT
From tank to the burner pellets are transported by a pellet feeder CPPT. The feeder tube contains an
Archimedean spiral which, with the assistance of an electric motor with gearbox, conveys pellets from
the tank to the burner via a flexible tube. Electric motor is factory wired and it has to be connected to a
connector at the rear side of the boiler control unit CPREG. If a power cable is damaged, its
replacement should be done by an authorized service man or a person trained for such works in order
to avoid risk of electric shock or damage of equipment.
2.5 Pellet tank CPSP
Pellet tank CPSP shall be located to the right (recommended) or left side, next to the boiler EKO-CK P
(EKO-CK) or EKO-CKB P (EKO-CKB). After it has been positioned, a pellet feeder should be installed
into the tank. Before filling of the tank, it is necessary to open the lid on the tank top and check
whether the tank is free from solid objects or any other foreign objects which should not be there.
Assembly of the pellet tank is described in assembly instructions of the pellet tank.
3. Component description and technical information
Cm Pelet-set type
14
20
25
30
35
Burner CPPL type
CPPL-14
CPPL-35
CPPL-35
CPPL-35
CPPL-35
Set thermal output
(kW)
14
20
25
30
35
Boiler type
EKO-CK P/CKB P 20
(EKO-CK/B 20)
EKO-CK
P/CKB P 25
(EKO-CK/B 25)
EKO-CK
P/CKB P 30
(EKO-CK/B
30)
EKO-CK
P/CKB P 35
(EKO-CK/B
35)
EKO-CK P/CKB P
40 (EKO-CK/B 40)
Pellet tank volume
(l)
370
Pellet tank height
(mm)
1545
Pellet tank depth
(mm)
730
Pellet tank width
(mm)
625
Supply voltage
V/Hz
230/50
Boiler width
(mm)
526
526
576
626
676
Set for installation
of pellet burner
(only
new boiler models)
14-25
14-25
14-25
30-35
30-35
Lower boiler door
CPDV
(mm)
CPDV for
EKO-CK P/CKB P 20, 25
(EKO-CK/B 20-25)
CPDV for
EKO-CK
P/CKB P 30
(EKO-CKB
30)
CPDV for
EKO-CK
P/CKB P 35
(EKO-CKB
35)
CPDV for EKO-
CK P/CKB P 40
(EKO-CK 40)

Technical instructions Cm Pelet-set
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4. Safety components
The burner is equipped with several safety mechanisms:
- Backfilling sensor / temperature gauge on inlet tube that is installed tube for connecting of
pellet feeding flexible tube. At excessive temperature on feeding tube error E3 is displayed at
control unit (LED diode switched on). At backfilling supply tube error E9 is displayed at
control unit (LED diode switched on).
Backfilling sensor in normal mode (green LED flashing while the other depending on the amount of
pellets that fall through the supply tube)
Backfilling sensor in a mode where the registered supply pipe backfilled with pellets
(all LEDs light for 10 seconds without blinking, the regulation is displayed error E9)
- Safety pressure switch built in the burner controls overpressure in the boiler combustion
chamber. If the set overpressure in the boiler combustion chamber is exceeded, pressure
switch stops feeding of pellets, the burner shut down and the error E1 is displayed at control
unit (LED diode switched on).
-If lower boiler door are opened while the burner is working, micro switch on lower boiler door
cuts the el. power to the control unit and burner. After closing the lower boiler door control unit
continues to work according power supply interruption regime.
-If there is no flame (the built in photo-cell does not detect the flame within set time), control
stops the burner operation and error E2 is displayed or it goes to blowing off and error E6 is
displayed (LED diode switched on).
-Control unit has a built in protective function which protects the boiler against overheating. If
temperature in the boiler exceeds 930C, regardless heating or sanitary water is needed the
boiler pump and/or the sanitary water turns on and works until temperature in the boiler falls
below 930C.
When temperature in the boiler exceeds 110°C (+0°C / - 9°C), power supply is turned off by the safety
thermostat (via control unit).
Thermal protection built in coils of the fan electric motor at the burner and the screw feeder motor,
protects them against overheating caused by failure or locking.

Technical instructions Cm Pelet-set
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A flexible tube connecting the pellet burner and pellet tank is made of plastic material reinforced with
metal wire which, in case of back flame from the burner to the tank, melts and prevents flame to
penetrate to the pellet tank.
5. Fuel
Wooden pellets are used as fuel in boilers with built in Cm Pelet-set. Pellets are bio-fuel made of
wooden wastes. Pellets can be stored in different ways: in bags of 15 kg, big bags of 1000 kg and in
bulk form in large tanks (4 to 15 m3) dug in soil or located in basement premises. The recommended
pellet properties for firing in Cm Pelet-set:
-Heating value >= 5 kWh/kg (18 MJ/kg)
-Diameter = 6 mm
-Max. length = 50 mm
-Max. moisture content = 12 %
-Max. dust content = 1.5 %.
6. Boiler Control Unit
The boiler control unit is supplied in a plasticized metal box prepared for installation on boilers
EKO-CK P (EKO-CK) and EKO-CKB P (EKO-CKB).
6.1 Description of buttons and symbols on the control unit
Button
Button function
Safety thermostat button
0
1
Main switch to turn on/turn off power supply to the control unit
Start/stop button (on/Off)
-By pressing the button for 3 sec. the burner turns on.
-While the burner operates, by pressing the button for 3 sec. the burner goes to
extinction phase.
-Short pressing of the button: Exit from parameter setting and their saving
Entry button to the parameter setting menu and going to the next parameter
Setting of the selected parameter to higher value.
Setting of the selected parameter to lower value.
Selection of the WINTER firing regime. In this regime the heating pump turns on and a
sanitary water pump also turns on if a sanitary water sensor is built in.
Selection of the SUMMER firing regime. In this regime only the sanitary water pump
turns on if a sanitary water sensor is built in. If it is a boiler with sanitary hot water
heater inside the boiler water and if no sanitary water sensor is built in, neither the
heating pump nor the sanitary water pump will turn on in the summer regime.
Manual switch on of the pellet feeder. It is used to supply the feeder with pellets (after
tank cleaning, tank discharge…).

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6.2. Symbol description
Indication of operation of the sanitary water heating pump.
Indication of operation of the heating pump circuit.
Indication of turn on status of timer (time programmes).
Indication of operation of pellet feeding screw feeder.
Indication of flame presence in the burner.
Indication of operation of the burner fan.
Indication of operation of electric heater (for firing of pellets).
An indication of activation errors except errors of safety pressure switch.
Indication of the safety pressure switch due to too high pressure in the boiler
combustion chamber.
6.3. Starting display and sanitary water temperature
Switching on the control unit
By switching on the control unit via the
main switch, the control is in OFF
mode, i.e. the burner does not
operate.
OFF is displayed in the upper display,
and current time and current
temperature in the boiler are written
in the lower display.
Indication of the current sanitary
water temperature
If the sanitary water sensor is
connected to the control unit and Pr02
is set to ON, by pressing and keeping
pressed + button, in any operation
mode or stand-by mode, the current
temperature of sanitary water is
displayed on lower display.
6.4. Setting of the burner operating parameters
Setting of the burner operating parameters can
be done in any operating mode (ON mode) or
stand-by (OFF mode) of the burner.
By longer pressing of SET button the parameter
setting menu is entered, and by short pressing of
SET button you can switch from menu to menu.
Exit from a menu to home display and saving of
modified values is made by short pressing of
On/Off button or by passing through all 8
parameters and returning to the home display.
If no button is pressed for 90 seconds, the control
unit exits from a menu to home display without
saving of modified parameters.

Technical instructions Cm Pelet-set
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Pr01: Boiler set temperature
Factory setting for winter firing regime:80°C.
Factory setting for summer firing regime: 65°C.
Available setting: min. 65°C; max. 90°C.
The boiler set temperature can be changed by
pressing + or - buttons.
By SET button you go to other menu; Pr02.
Pr02: Enabling heating of sanitary water in
tank not built in the boiler (located next to the
boiler)
Factory setting: OFF –sanitary water heating
switched off.
Available setting: ON (turned on) and OFF (turned
off).
In order to be able to turn on this function, it is
necessary to have a built in sanitary water sensor
(to connector 4). By pressing of + and - buttons
sanitary water heating is turned on (ON) or turned
off (OFF). By putting of Pr02 to ON and by
pressing SET button we enter sub-programme
Pr02.
Sub-programme Pr02: Sanitary water set
temperature
Factory setting: 50°C
Available setting: min. 40°C; max. 80°C
If is inbuilt sanitary water sensor and Pr02 on ON,
sanitary water set temperature can be changed
with buttons + and -. By SET button you go to
other menu; Pr03.
Pr03: Digital clock setting
By entering Pr03 menu digital clock figure starts
flashing which can be set by + and - buttons. By
pressing of SET button the minute figure starts
flashing. Correct value is set by + and –buttons
and confirmed by pressing SET button.
Pr04: Day setting
Pr04 programme enables setting of a day of a
week (important for correct functioning of
activating times).
DAY 1 = Monday (LED diode switches on )
DAY 2 = Tuesday (LED diode switches on )
DAY 3 = Wednesday (LED diode switches on
)
DAY 4 = Thursday (LED diode switches on )
DAY 5 = Friday (LED diode switches on )
DAY 6 = Saturday (LED diode switches on )

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DAY 7 = Sunday (LED diode switches on )
Next menu Pr05 is entered by SET button.
Pr05: Setting activating times (timer)
Factory setting: OFF (turned off)
Available setting: ON (turned on) and OFF (turned
off).
Activating times enable independent burner
operation according to set activating times and
days of a week. 3 ON times and 3 OFF times can
be set in each day of a week. Minimum length of
one activating time is 1 hour, and minimum period
between off time and next on time is 1 minute. ON
and OFF times may not overlapped.
Sub-programme Pr05: Setting activating time
Factory setting: DAY1=OFF, DAY2=OFF,
DAY3=OFF... (all days off).
Available setting: ON (turned on) and OFF (turned
off) for each day separately.
If setting activating times is turned one (ON), you
may select a day on which we want to activate on
times. For example, if we wish to turn inactivating
time for Mondays, we have to change DAY1= OFF
(by “+” or “-“ buttons) to DAY1=ON and then press
SET button.
Sub-programme Pr05: Setting 1st activating
time
“I On” refers to the first firing time, factory set to
06:00, and “I OFF” means the first burner
extinction time, factory set to 22:00.
Sub-programme Pr05: Setting 2nd activating
time
Next menu “2 On” refers to the second firing time,
factory turned off (- - : - -), and “2 OFF” means the
second burner extinction time, factory turned off (-
- : - -). For turning on the second activating time,
the first burner shut-time must be shorter at least 1
minute than the second burner firing time.
Sub-programme Pr05: Setting 3rd activating
time
Next menu “3 On” refers to the third ignition time,
factory turned off (- - : - -), and “3 OFF” means the
third burner extinction time, factory turned off (- -:-
-). For turning on the third activating time, the first
and second burner shut-times must be shorter at
least 1 minute than the third burner firing time. By
next pressing of SET button we move to the next
day, DAY2 = OFF.

Technical instructions Cm Pelet-set
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Burner CPPL-14
Pr06: Setting of burner output CPPL-14
Factory setting: P-2
Programme meaning: P-2 –14 kW
Burner output is set by + and –buttons in
accordance with the boiler output.
Burner CPPL-35
Pr06: Setting of burner output CPPL-35
Factory setting: P-3
Programme meaning: P-3 20 kW
P-4 25 kW
P-5 30 kW
P-6 35 kW
Burner output has to be set by + and –buttons in
accordance with the boiler output.
Pr07: Turning on anti-frost programme
(allowed to be used only if a room thermostat
is connected)
Factory setting: OFF (switched off)
Available settings: “On” (turned off) and “OFF”
(turned on).
If anti-frost programme is turned on by pressing
“+” button, and room thermostat is (obligatory)
set to minimum, control unit will monitor
temperature in the boiler and sanitary water tank
and when it drops below +50C, the burner will turn
on and heat boiler to Tset.
Pr08: Service menu, PIN (code) entry (only for
servicemen)
Factory setting: OFF (switched off)
Available setting: Pin (switched on)
If “+” button is pressed, “Pin” appears in the lower
screen and PIN (enabling us to enter the service
menu for setting of burner parameters) can be
entered.
By SET button we exit Pr08.
Pr09: Service menu, PIN (code) entry (only for
servicemen)
Factory setting: OFF (switched off)
Available setting: Pin (switched on)
If “+” button is pressed, “Pin” appears in the lower
screen and PIN (enabling us to enter the service
menu for setting of burner parameters) can be
entered for the basic configuration software.
By SET button we exit Pr09.

Technical instructions Cm Pelet-set
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Pr10: Additional equipment, Pellet suction system
(This parameter is visible only when service man install
and turn ON pellet suction system. For detailed
description see technical instructions for installation
and use of pellet suction system.)
Forced burner shut down
If forced burner shut down is needed for any
reason, and without standard extinction phase, it
can be done by shut down of control unit at the
main switch with simultaneous pressing of On/Off
button. Control unit is then in OFF mode, i.e.
burner is shut down. If control unit experiences
any error after forced shut down, and if such error
is not corrected and resetting was not performed,
control unit will return to error mode. Depending
the phase during which forced extinction was
made, burner and grate must be thoroughly
cleaned.
Control unit resetting to factory settings
To reset to factory settings control unit has to be
turned off on the main switch, and then
WINTER and SUMMER buttons have to be
pressed simultaneously and keep them pressed
while the main switch is being turned on. Four
eights (8888) are displayed in the upper display,
and FAC X (X denotes the currently set
programme) are displayed in the lower display,
and after that both displays resume their original
settings: OFF is displayed in the upper display,
and current time/boiler temperature are
displayed in the lower display.
7. Burner operation
7.1 Procedure of the first firing
1. Fill tank with pellets.
2. Check if all required connectors are connected to control unit and burner.
3. Check whether there is a grate and front cover in the burner head and whether the grate is
positioned beneath the electric heater.
4. Check if a ceramic nozzle is placed on the burner (only CPPL-14).
5. Check if the lower boiler door is closed and if micro switch is pressed with lower boiler door.
6. Plug in the boiler control unit into the mains outlet and press main switch to 1, check whether OFF
appeared on the upper display and current time/current temperature in the boiler on the lower
display.
7. Disconnect pellet feeding flexible tube from the burner and put a receptacle beneath it. Press
button for filling the feeder with pellets and keep it pressed until the feeders is filled up, i.e.
until pellets start dropping from the flexible tube (it can take 5 to 10 minutes, depending on pellet
type). Instead of pressing the pellet filling button, you can disconnect connector (1) from control
unit and connect it with the cable connector (2) of electric motor supplying 230 V to electric motor

Technical instructions Cm Pelet-set
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of feeder. Wait until pellets start dropping from the tube and then disconnect connectors of electric
motor and power supply.
8. Connect again pellet feeding flexible tube to the burner (and put connectors (1) and (2) into
connectors at the boiler control –if they have bee disconnected).
9. Select WINTER or SUMMER regime, as needed.
10. Select preferred parameters by pressing the SET button (meaning and selection of the parameters
has been described in previous chapter) and set the correct output of the burner (Pr06) according
the boiler output.
11. Press ON/OFF button 3 seconds while ‘’On’’ appears on upper display.
12. Flame will appear within 3 to 10 minutes (depending on the burner temperature and on quality of
wooden pellets).
13. Depending on selected regime of factory setting temperature and depending the room thermostat
is connected or not, pumps operate in the following way:
- “winter regime”: heating pump and sanitary water pump (if sanitary water sensor is built in and
Pr02 is “On”) turn on at min. 610C and turn off at boiler temperature of 590C. If the room
thermostat is connected, it activates pumps as required in the room, provided the boiler
temperature is min. 610C and pumps turn off at boiler temperature of 590C.
-“summer regime”: (with tank outside the boiler, provided the sanitary water sensor and Pr02 is
“On”) sanitary water pump turns on at boiler temperature of min. 610C turn off at boiler
temperature of 590C.
- “OFF mode“ (main switch on; OFF on the upper display, burner is not working): heating pump
and sanitary water pump (if the sanitary water sensor is installed and Pr02 is on “ON”) is staring to
operate on 68°C, and switch off on 66°C, the room thermostat do not have the function.
14. In normal burner operation current boiler temperature will appear in the upper display and current
time will appear in the lower display.
15. When the burner reaches set output (after approx. 8 to 15 minutes, depending on set power), and
after the flame is stabilised, flue gases have to be analysed and, if necessary, to perform fine
tuning of combustion parameters of the burner (it should be done by a professional or serviceman
only).
16. After the set temperature is reached Tset (Pr01), control unit starts extinction (shut down) phase
and the burner goes to stand-by phase, current boiler temperature is displayed in the upper
display and OFF is displayed in the lower display.
7.2 Extinction procedure
Keep ON/OFF button presses for 3 seconds, until OFF appears in the upper display. In that
moment, pellet feeding is stopped, current boiler temperature appears in the upper display, OFF
appears in the lower display, fan operates until flame is completely extinguished (or max.180
seconds). Afterwards, fan continues to work for certain period of time until the burner grate is blown off
and then the burner is shut down, OFF appears in the upper display and current time/current time in
the boiler appears in the lower display.
8. Control unit operation
8.1 Firing phase
After pressing ON/OFF button for 3 seconds, ON appears in the upper display, followed by
current temperature in the boiler, and current time appears in the lower display.
(If the boiler temperature is between Tset and Tset –50C at the moment of firing, current boiler
temperature is displayed in the upper display and OFF is displayed in the lower display. When the
boiler temperature drops below Tset –50C, firing phase follows).
LED diode at control unit turns on indicating fan operation which blows off the burner grate.
Pellet feed and heater turn on. Depending on the boiler output, i.e. burner, initial pellet
feeding lasts 75 seconds for CPPL-14 and 85 second for CPPL-35, and the heater continues working
(safety time of 12 minutes starts from the beginning of pellet feeding). If no flame appears in that time,
firing process is interrupted and error “E2” appears in the display. After pellet feeding is stopped,

Technical instructions Cm Pelet-set
13
heater works until flame appears and control unit starts monitoring operation of the photo-cell. If photo-
cell detects flame within the safety time (12 min.), heater will work for another 60 seconds and then it
turns off.
After photo-cell has detected flame, control unit checks for 10 seconds whether flame is stabilized and
turns on indication for presence of flame in the burner. Since that moment time required for good
flame is running.
8.2 Transition phase
After pellets blaze up, transition phase of the burner operation starts wherein the burner output is
increasing gradually to the set power. During that period proper basis for further pellet combustion is
being prepared.
8.3 Operating phase
After transition phase ends, the burner starts to work at set parameters (set output).
Operation in winter regime :
Control unit monitors boiler temperature and, if necessary for heating (or room thermostat gives such
instruction to the pump) and sanitary water, boiler temperature reached 610 C, heating pumps and
sanitary water pump turn on (if sanitary water is enabled). If boiler temperature drops below 590C,
pumps turn off (regardless the needs). When the boiler reaches temperature of Tset- 40C, control unit
reduces the burner output for 2 stages (e.g. from P6 to P4), and if temperature continues to rise and
reaches temperature Tset—20C, control unit will again reduce the burner output by 2 stages (e.g. from
P4 to P2) and, when the boiler reaches temperature of Tset, the burner starts extinction procedure. If
the boiler reached Tset- 40C, but it cannot reach temperature Tset—20C within 3 minutes the burner
returns to set output and, when boiler reaches temperature Tset—20C, control unit will reduce burner
output by 2 stages. If in that operating regime boiler does not reach temperature Tset within 2 minutes,
the burner resumes to set output and at temperature Tset the burner the burner starts extinction
procedure. The burner re-ignites when the boiler temperature drops below Tset- 50C.
Operation in summer regime :
a) With sanitary water tank (next to the tank)
If we wish to use boiler for heating of sanitary water only, either in stand alone or wall mounted
sanitary water tank and not to turn on the heating pump, summer regime must be turned on, sanitary
water sensor must be connected (to connector 4 at the control unit box) and programme Pr02 must be
enabled (On). In programme Pr02 preferred sanitary water temperature is set (400C to 800C) and set
boiler temperature Tset is determined according to Tpreferred sanitary + 100C (min. boiler temperature is
always 650C). Hysteresis of sanitary pump operation is fixed, factory set to 50C. Sanitary water pump
always turns on at boiler temperature of min. 610C and turns off at 590C. The burner works according
to the set operation regime until it reaches Tpreferred sanitary + 100C –40C when control unit reduces the
burner output by 2 stages and, if temperature continues to rise and reaches temperature Tpreferred sanitary
+ 100C –20C, it reduces again the burner output by 2 stages and, when the boiler reaches
temperature Tpreferred sanitary + 100C burner starts extinction phase. If the boiler reaches Tpreferred sanitary +
100C –40C but it cannot reach temperature Tpreferred sanitary + 100C –20C within 3 minutes, the burner
resumes to the set output and, when the boiler reaches temperature Tpreferred sanitary + 100C –20C
control unit reduces the burner output by 2 stages.
If in that operating regime boiler does not reach temperature Tpreferred sanitary + 100C within 2 minutes, the
burner resumes to set output and at temperature T preferred sanitary + 100C the burner the burner starts
extinction procedure. The burner re-ignites when the boiler temperature drops below T preferred sanitary +
100C - 50C.

Technical instructions Cm Pelet-set
14
Operation in summer regime :
b) With a boiler with sanitary hot water heater inside the boiler water
If we wish to use boiler only for heating of sanitary water in the sanitary hot water heater in the boiler
water, and not to turn on heating pump (and sanitary water pump –which, in this case, is not needed),
summer regime must be turned on without connected sanitary water sensor. Programme Pr02 must
be turned off (OFF). Sanitary water temperature is set by boiler temperature (i.e. sanitary water
temperature well be equal to boiler water temperature). The burner works under winter regime, except
heating pump and sanitary water pump do not turn on.
8.4 Extinction phase
After reaching set temperature of the boiler, the burner starts extinction phase –in manual operation it
is done by pressing ON/OFF button, in automatic extinction it is done in accordance with set activating
times and when errors E4, E5 and E6 occur.
In the beginning of extinction phase, pellet feeding is stopped, OFF appears in the lower display, and
current boiler temperature appears in the upper display, fan works all the time the flame in burner is
detected by the photo-cell (or max. 180 seconds). After that fan work for another 120 second to blow
off the grate and prepare it for next firing.
8.5 Operation with timer
Control unit can automatically switch on and off the burner according to set weekly and daily
programmes. Precondition for proper functioning of the burner with timer is correctly set current time
and day of a week.
Three turns on and three turns off can be planned per day of a week. All activating times are factory
set to off. For turning on of activating time see Setting of the burner operating parameters. For proper
and efficient burner operation minimum burner work time is 1 hour, and min. stand-by time between
two activating times is 1 minute.
8.6 Frost protection programme, allowed to use only if the room thermostat is connected
If we want to maintain minimum temperature (+5°C) in the boiler and sanitary water tank (if Pr02 is
On) and minimum room temperature set at the room thermostat connected to the control unit, Pr02
programme has to be set to On. Main switch of the control unit must be in on mode, and control unit
has to be in OFF mode (switched off).
The room thermostat must be connected to the control unit and set to minimum.
The burner turns on if the boiler temperature and/or sanitary water tank is below +5°C and/or an pulse
is given by the room thermostat, and Tboiler is below 65°C, respectively. The burner turns off when the
set boiler temperature is reached. The burner turns on again when the boiler and/or sanitary water
tank temperature is below +5°C and/or an pulse is given by the room thermostat and
Tboiler is below 65°C, respectively. Heating pump turns on when a pulse is given by the room
thermostat at Tboiler > 610C or due to safety reasons (boiler overheating). If boiler Tboiler < 65°C, and
thermostat send a pulse, the control unit will turn on the burner and heat the boiler to Tset. If Pr07
programme is turned on (On), and boiler is OFF, Pr07 and OFF appear alternately in the upper display
and current time and current boiler temperature are displayed in the lower display.
8.7 Boiler overheating protection
The control unit has a built-in protection which protects boiler against overheating. Regardless the
operating regime (either winter or summer) and regardless the needs, the control unit turns on
circulation pumps to cool the boiler.
In winter and summer regimes, if the boiler temperature exceeds 93°C, and regardless heating or
sanitary water is needed, the boiler pump and/or sanitary water pump turns on and works until the
boiler temperature drops below 93°C.

Technical instructions Cm Pelet-set
15
8.8 Flame extinction during operation
If during the firing phase flame appears and then disappears, the control unit will continue normal
operation for next 4 minutes (till transition phase PP4) or 15 seconds (from transition phase PP4 to set
programme –provided it is not less than P4) to recover the flame. If the flame does not appear, control
unit goes back to the firing phase without pellet feeding until the flame is developed or, if flame does
not appear in the safety time of 12 minutes, till error E2 appears.
If flame disappears during operation under set programme, after 15 seconds without flame the control
unit goes to extinction phase and sent message on E6 error.
8.9 Power supply interruption
If power supply is interrupted while the burner is working (what can also occur because of opening the
lower boiler door while the burner is working), after supply is re-established, On, 230 and Tboiler appear
alternately in the upper display, and current time appears in the lower display, to indicate that the
burner restarts after power supply is re-established. After power supply is re-established, the burner
performs firing without pellet feeding (regardless flame is present or not, lasts 12 minutes) and then
goes to extinction phase and On, 230 Tboiler appear alternately in the upper display and OFF appears
in the lower display (regardless whether it should work or not). If, after completion of extinction phase,
the burner should work, it goes to normal firing phase and, if the burner need not to work anymore,
OFF appears in the upper display and current time and Tboiler appears in the lower display.
If, during the next burner start up, error E2 or E6 occur within time before the burner reaches the set
programme, Err will be displayed in the upper display and E230 will be displayed in the lower display
indicating that error could be caused by power supply interruption.
If the main switch turns off (or power supply is interrupted), during operation, the burner will, after main
switch is turned on again, continue to operate under regime as in case of power supply interruption.
8.10. Operation of the regulation in OFF mode / boiler firing with solid fuel - not used for
EKO-CK P boilers
Case a)
New models of boilers (doors can be rearranged to burn solid fuel or pellets)
Rearrange lower boiler door in reverse order from that described in the technical manual (EKO CK P/
CKB P p.8) so that the door be converted to burn solid fuel, or buy additional door for combustion of
solid fuels. The door mounted on the boiler and install the regulator drafts.
Case b)
Old models of boilers (must be installed doors for solid fuel combustion)
Remove the lower pellet door and pellet burner CPPL CPDV door and mount the lower door for solid
fuel and install the regulator drafts.
When you have prepared the door, connect in the 6 - poles regulation connector which is unplug from
the pellet burner (4 - poles regulation connector of the burner do not connect). Reverse the lid of the
micro switch so You disable the operation of the micro switch (see next picture). Boiler regulation is
obligatory to be switch on, on the main switch. On the upper display is shown “OFF”and on the lower
is alternate the time and boiler temperature. In this operation time of the boiler regulation (if the
antifreeze program in not switch on) the room thermostat is not active and the heating and sanitary
water pump (if the sanitary water program parameter is switch on in the program Pr02 and the sensor
for sanitary water is inserted) are switch on at the 68°C, and switch off at 66°C. If the regulation is not
switch on (main switch on “0”) the heating pump and sanitary water pump (if we have it) will not be in
operation.

Technical instructions Cm Pelet-set
16
Solid fuel firing
9. Errors
Regardless the current operating regime of the burner, if errors E1, E2, E3, E7, E8, E9 and E230
occur, the control unit will stop operation immediately, while in case of errors E4, E5 and E6 burner
goes to extinction phase. If control unit is in firing phase and flame has not occurred yet, due to
notification on error, supply, fan and heater will be stopped immediately.
In case of error “Err” appears in the upper display and error type appear appears in the lower display
and if it is also necessary to carryout extinction phase (in case of E4, E5 and E6 errors) “Err” appears
in the upper display and “OFF” and error type appear alternately in the lower display.
Error symbols: - E1 –safety pressure switch (LED diode turns on)
- E2 –firing safety time expired
- E3 –excessive temperature on feeding tube (LED diode turns on)
- E4 –boiler temperature sensor
- E5 –sanitary water temperature sensor
- E6 –flame disappeared
- E7 –error in memory
- E8 –interruption in fan operation
- E9 –backfilling supply tube with pellets
- E230 –signal of error E2 or E6 due to power supply interruption
To enable control unit to resume to normal
operation, error must be corrected and cancel it on
the control unit. Error is cancelled by simultaneous
pressing WINTER and SUMMER buttons and ''+''
button. If the error cause is not repaired, error
cannot be cancelled.
9.1. Errors and possible causes
ERROR
CAUSE
WHAT TO DO
E1 –safety
pressure switch
Too high resistance in
combustion chamber
Check:
How much is filled the boiler combustion chamber
with ash, registers, flue gas tube and chimney;
whether the pipe between pressure switch and boiler
door is pressed. ,
E2 –firing safety
time expired
Flame does not occur
within safety time (12
min.)
Check whether:
there are pellets in pellet tank;
there are pellets in pellet screw feeder;
pellet feeder flexible tube has slope toward the

Technical instructions Cm Pelet-set
17
burner so pellets can drop freely into the burner;
the burner grate is located correctly in the burner
(that it does not rest ON electric heater);
pellets are not too moist;
pellets are of appropriate size (for these burner
setting they should have diameter of 6 mm);
hot air blows from the burner (i.e. whether electric
heater has not blown);
the photocell sensor is clean.
E3 –excessive
temperature on
feeding tube
Pellet feeding tube
temperature at burner
above
80°C
Possible fan stoppage.
Possible filling up of the burner combustion chamber
and feeding tube due to wrong set of combustion air,
wrong set parameters of charge,
inadequate size or quality of pellets, incorrectly set
air in combustion chamber.
Inappropriate pellet size and quality.
Possible hole in flexible tube or disconnection of
flexible tube from feeding tube.
possible delays fan.
E4 –boiler
temperature sensor
Error in boiler
temperature sensor
Check sensor position.
Check damages of sensor and cables.
Check contacts on connectors.
E5 –sanitary water
temperature sensor
Error in temperature
sensors in sanitary
water tank.
Check sensor position.
Check damages of sensor and cables.
Check contacts on connectors.
E6 –flame
disappeared
Photocell does not
detect flame in the
burner combustion
chamber.
Due to lack of pellets, feeding of too moist pellets, or
due to dirty photocell.
E7 –error in
memory
Memory failure
Resetting of control unit to factory setting is required.
E8 –fan
malfunction
Sensor of revolution
number does not “see”
fan rotation
Due to failure of rpm sensor, due to failure of fan
bearings (check whether it can rotate freely), due to
entrance of foreign object into the fan rotor, due to
activation of fan overheating protection (after cooling
down by 30°C fan can be restarted).
E9 –backfilling
supply tube with
pellets
Backfilling supply tube
with pellets
Check the burner grate fill, burner combustion
chamber, combustion chamber of the boiler, flue gas
tube and chimney, is the burner grate is properly
placed in the burner (that is not set to the electric
heater), whether the pellets are moist, not properly
size or quality of pellets (for these burner settings is
properly diameter of 6 mm), possible holes in a
flexible tube, incorrectly configured parameters of
charge, incorrectly adjusted air combustion.
E230 –error E2 or
E6 due to power
supply
interruption
Due to power supply
interruption in safety
time
(12 min.) flame did not
occur or photocell
does not detect flame
in the burner
programme before
reaching the set
programme
Check filling up level of the burner grate, burner
combustion chamber and check possible methods to
eliminate errors E2 and E6.

Technical instructions Cm Pelet-set
18
10. Connectors at the control unit box
At outer side of the control unit box there are connectors for connection of the control unit with
sensors, pumps, burner and power supply network. Figure shows connectors arrangement and their
purpose.
Figure: Connectors at the control unit box
11. Maintenance of Cm Pelet-set
It is recommended to clean the burner and boiler combustion chamber after each consumed pellet
tank (approx. 200 kg).
If required, cleaning frequency can be increased or reduced compared to the recommended one,
depending on quality of pellets and frequency of the burner turning on/turning off.
The following has to be checked: - sediment in the boiler combustion chamber and clean it when
required;
- Ash in the burner combustion chamber (under the grate) –remove
the grate (see figure) and if is necessary clean the burner firebox;
- sediment at burner grate and clean it when required;
- ash amount in ash tray and empty it as required;
Removal of the front burner covers for easier cleaning and correct grate position

Technical instructions Cm Pelet-set
19
The following components must be thoroughly checked/cleaned:
- Clean thoroughly burner, grate...
- Clean photo-cell
- Empty and clean pellet tank
- remove and clean pellet feeder
Cleaning frequency of above items depends on pellet quality and it should be adjusted accordingly
- Check flexible connecting tube and place it so that flexible pellet feeding tube is inclined
toward the burner so that pellets can fall freely into the burner,
- Check wires and connections and replace them when required.
12. The possibility of fan lid installing
Burners CPPL-14 and CPPL-35 which have connectors for electrical connections built-in below burner
cover, which power lines in safety rail to connectors are coming from burner bottom (see schemes in
this manuals) not the through cover side of burner cover are factory predicted for subsequent
istallation possibility of fan lid.
Fan lid must subsequently fitted by authorized service by Centrometal with autorization for this type of
product or Centrometal service.
Subsequent installation of fan lid include installation of fan lid assembly to burner, electrical wiring of
burner and installation of electronical board with wiring to boiler control unit.
Subsequent installation can be done on place where is burner mounted or Centrometal factory.
With purchasing fan lid for subsequent installation are received all part which is needed to install.

Technical instructions Cm Pelet-set
20
Centrometal d.o.o. shall not be responsible for possible incorrect data caused by printing errors or errors during transcription
and in any case, it reserves the right to modify its products deemed to be required and useful, without any prior notification.
.
CMPL-02
02:82f6
Macinec, November 2016.