5.1. Ugradnja pelet plamenika i pelet regulacije na kotao

a) Installation on the boiler door: Remove the oil burner adapter from the right lower boiler door. Remove the protective cover. Mount the flame tube (with seals) onto the prepared door screws and secure with M8 nuts. Attach the delivery box, place a seal, and then the delivery hose (oriented towards the pellet tank) and secure with M4 x 15 screws. Connect the 3-pin sensor connector to the delivery hose and the 3-pin connector on the delivery box. Fit the PVC/silicone tube from the pressure switch on the burner to the designated connection on the boiler door (trim if necessary). Reinstall the protective cover and tighten the screws.

Diagram Description: Shows the process of removing the oil burner adapter and mounting the pellet burner components onto the CentroPlus boiler door.

b) Mounting the boiler regulation: Attach the CPREG boiler regulation to the upper side of the boiler casing using the supplied 3.9 x 9.5mm screws. Insert the safety thermostat and regulation sensor into the boiler's thermowell (top side for CentroPlus, front side for CentroPlus-B, routing sensors along the side). Connect the 4-pin and 6-pin cables to the burner and secure them with screws. Attach the wiring harness between the regulation and burner to the boiler using the supplied plastic cable clips (secured with 3.9 x 16mm sheet metal screws).

7.1. Opis tipki i oznaka na regulaciji (Button and Symbol Descriptions)

The control panel features several buttons:

• [1]: Safety thermostat button.
• [0]: Main switch for regulation power ON/OFF.
• [SET]: Start/stop button. Holding for 3 seconds starts the burner. Holding for 3 seconds during operation initiates the shutdown phase. A short press exits parameter settings and saves them.
• [+]: Enters parameter adjustment menu and moves to the next parameter.
• [+]: Increases the selected parameter value.
• [-]: Decreases the selected parameter value.
• [ZIMA]: Selects WINTER mode. The heating pump activates, and if the domestic hot water sensor and tank are installed, the domestic hot water pump also activates.
• [LJETNI]: Selects SUMMER mode. Only the domestic hot water pump activates if the sensor and tank are installed. If the domestic hot water tank is submerged in boiler water without a sensor, neither pump will activate in summer mode.
• [Pellet Feed]: Manually activates the pellet feeder for filling the transporter (e.g., after cleaning the tank or emptying it).

7.2. Opis simbola (Symbol Descriptions)

• [Ω]: Indicates domestic hot water pump operation.
• [Grijanje Pumpa]: Indicates heating circuit pump operation.
• [Timer]: Indicates timer (program schedule) activation.
• [Pellet Conveyor]: Indicates pellet feeder operation.
• [Flame Symbol]: Indicates flame presence in the burner.
• [Fan Symbol]: Indicates burner fan operation.
• [Heating Element Symbol]: Indicates electric heater activation (for pellet ignition).
• [Error Symbol]: Indicates an error, except for safety pressure switch activation.
• [Pressure Error Symbol]: Indicates safety pressure switch activation due to excessive boiler pressure.

7.3. Osnovno podešavanje rada plamenika (Basic Burner Operation Adjustment)

Basic burner operation adjustments are detailed in the "Tehničkim uputama Korištenje i održavanje Cm Pelet-set-a" manual, specific to the boiler type (EKO-CK P / EKO-CKB P or CentroPlus / CentroPlus-B).

7.4. Osnovno konfiguriranje software-a (Basic Software Configuration)

This section is for authorized service technicians and covers configurations such as:

• Boiler temperature for initial pellet burner ignition when operating on wood without a buffer tank (for CentroPlus/-B boilers).
• Maximum temperature in the buffer tank for initial pellet burner ignition (if a buffer tank is installed).
• Pump shutdown based on buffer tank status.
• Desired buffer tank temperature setting (if a buffer tank is installed).
• Burner operation difference "D" setting.
• Domestic hot water priority setting (must remain at factory default if a buffer tank is installed).
• Operation with an external regulator or remote control.

Service Menu Pr 08 (Fine-tuning Burner Operation Parameters):

To access the fine-tuning menu, navigate to program Pr08 by repeatedly pressing the "SET" button and enter the correct PIN. The PIN is a sequence of 5 specific button presses.

Parameter Descriptions (OP01-OP08):

• OP01: Boiler temperature for first pellet burner ignition (for CentroPlus/-B boilers running on wood without a buffer tank). Factory default: "0" (disabled). Adjustable: "0" or "50-80°C".
• OP02: Maximum buffer tank temperature for initial pellet burner ignition (if a buffer tank is installed). Factory default: "0" (disabled). Adjustable: "0" or "40-85°C". If OP02 is enabled, the domestic hot water sensor is treated as a buffer tank sensor and must be installed in the lowest thermowell or below the desired water level.
• OP03: Pump shutdown based on buffer tank (CAS). Factory default: "0" (disabled). Adjustable: "0" or "60°C...(90-(D+1))". If OP03 is enabled, Tboiler setting ("Pr01") must be at least ("OP03 setting) + (D+1)°C. D is the burner operation difference. For systems with a return temperature protection element, OP03 should be set to the minimum opening temperature of the element +1.
• OP04: Desired buffer tank temperature (if a buffer tank is installed). Factory default: "0" (disabled). Adjustable: "0" or "20-90°C". Not applicable for the first start if "OP02" is active.
• OP05: Burner operation difference "D". Factory default: "0" (disabled), boiler (and buffer tank if OP03/OP04 are enabled) difference = 5°C. Adjustable: "0" or "6-15°C".
• OP06: Domestic hot water priority. Factory default: "0" (disabled). Adjustable: "0" (disabled), "1" (enabled), "2" (enabled). "1" prioritizes domestic hot water (stops heating pump when DHW is requested). "2" allows heating pump to run for 5 minutes (if requested) or stand for 5 minutes for DHW. OP06 has no function if OP02 or OP04 are enabled. If a buffer tank is installed, this option must be disabled ("0").
• OP07: Operation with external regulator or remote control. Factory default: "0" (disabled). Adjustable: "0" (disabled), "1" (enabled). OP07 can be enabled ("1") only if OP01 and OP02 are disabled. The "ON/OFF" button has priority; no other action can restart the burner during the shutdown phase (+5 minutes) except manual pressing of "ON/OFF".
• OP08: Function setting for REL1 - voltage-free output 230V (optional CMPLEX-03 board). Factory default: "1" (Damper). Adjustable: 0 - disabled, 1 - damper, 2 - air cleaning. Cannot select the same setting for Pr9_OP8 and Pr9_OP9, except for 0 (disabled) or factory setting.

OP09: Function Setting for REL2 - Voltage-Free Contact NO/NC/COM (on additional board)

Factory default: "1" (Damper). Adjustable: 0 - disabled, 1 - damper, 2 - air cleaning, 3 - alarm (relay activates when no alarm is present; specific contact type depends on board connections). Cannot select the same setting for Pr9_OP8 and Pr9_OP9, except for 0 (disabled) or factory setting.

OP10: Burner Operation Mode / Start with Room Thermostat

Factory default: "1" (operation without maintaining boiler temperature - burner starts based on boiler temperature difference + additional demand from room thermostat or DHW tank). Adjustable: 0 - operation maintaining boiler temperature (burner starts based on boiler temperature difference); 1 - operation without maintaining boiler temperature (burner starts based on boiler temperature difference + additional demand). Setting 0 means the burner activates when the boiler temperature drops by the set difference below the target temperature, ignoring room thermostat or DHW tank demand. This is mandatory for boilers with a DHW tank (EKO-CKB P) and optional for boilers without a DHW tank (EKO-CK P) where boiler temperature maintenance is desired. For boilers with a DHW tank in summer mode, a jumper must be installed in place of the DHW sensor. Setting 1 means the burner activates only when both conditions are met: boiler temperature drops below the set difference, AND there is a demand from the room thermostat or DHW tank (DHW sensor must be connected and DHW enabled). This is used for boilers without a DHW tank (EKO-CK P) where boiler temperature maintenance is not desired, and the burner should start based on the room thermostat or DHW tank demand.

OP11: Operation with CM-GSM (Optional Accessory)

Factory default: "OFF" (disabled). Adjustable: OFF - disabled, ON - enabled.

7.5. Fino podešavanje parametara rada plamenika (Fine-Tuning Burner Operation Parameters)

For fine-tuning burner parameters (e.g., due to different pellet quality, chimney draft), the service menu allows adjustment of pellet feed times and fan speeds.

Service Menu Pr 08 for Fine-Tuning Burner Operation Parameters:

Access the menu by repeatedly pressing "SET" to reach program Pr08, then enter the PIN.

PIN Entry: The PIN is a sequence of 5 specific button presses.

Parameter Display: After entering the PIN, the display shows parameters like FP01 (for burner not running) or the current operating parameter (e.g., FPXX) when the burner is running.

Navigating Parameters: Use "SET" to move between parameters. Use "ON/OFF" to exit and save changes. The system exits the menu automatically after 90 seconds of inactivity.

Viewing Current Status: After exiting the service menu, current parameters can be viewed for 60 minutes. Re-entering the PIN reactivates this feature.

Diagram Descriptions: Show examples of the control panel display for different states (OFF, parameter display, operating states, fan speed display).

Parameter Table (CPPL-14 & CPPL-35): Detailed tables list parameters (FP01-FP44), their descriptions, factory settings, and adjustable ranges (times in seconds/minutes, speeds in rpm).

8. Nestanak struje (Power Outage)

If a power outage occurs while the burner is operating, upon power restoration, the burner will initiate a new ignition sequence (without feed) for a maximum of 12 minutes (parameter FP04). If a flame appears, it proceeds to the burning phase (state PP1), followed by maximum fan speed operation (up to 30 minutes), and then a purge cycle. If the burner was manually started or started by a timer before the outage, it will begin with a feed phase after purging and resume normal operation. If power is restored outside of the scheduled operating time, the burner will purge and then stop (display "OFF"). Error codes E230 may appear if the outage caused an issue, but the system will resume normal operation after the scheduled program is reached. To force shutdown, turn off the main switch; to restart, hold the "-" button while turning on the main switch. The burner will resume operation as if a power outage occurred after power is restored.

9. Elektro spajanje (Electrical Connections)

All electrical connections must comply with national installation regulations. Fuses F1 (4A) and F3 (ESKA 521.022 MIDIUM 3.15A) are located in the regulation box. Fuse F2 (1.6A) is on the electronic board.

• Fuse F1 (4A): Connects to all loads.
• Fuse F2 (1.6A): Connects to the electronic board.
• Fuse F3 (ESKA 521.022 MIDIUM 3.15A): Connects to the electric heater.

Important: Use only the specified fuse for F3 (Manufacturer: ESKA, Type: 521.022, MIDIUM 3.15A).

A room thermostat can be connected to control the circulation pump. For multiple room thermostats, an adapter for zone regulation (optional accessory) is required.

Wiring Diagrams Description:

The document includes detailed wiring diagrams for the regulation unit (CPREG) and the burner (CPPL). These diagrams show connections for the main switch, network filter, fuses, safety thermostat, room thermostat, heating pump, domestic hot water pump, pellet transporter, and pellet burner, including specific pin assignments and cable colors.

10. Mogućnost dodatne ugradnje zaklopke ventilatora (Optional Fan Damper Installation)

Burners CPPL-14 and CPPL-35 are factory-prepared for the optional installation of a fan damper. This installation involves fitting the damper assembly into the burner, wiring it, and installing a printed circuit board and wiring into the regulation unit. Installation can be done by an authorized Centrometal service technician or the factory service department. Purchasing the fan damper kit includes all necessary components.

Diagram Description: Shows the fan, solenoid valve, and fan damper assembly components that are installed within the burner.