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Summary of Contents for REMEHA Calenta 25s
- Page 1 Netherlands High-efficiency wall-hung condensing gas boilers Calenta 25s - 28c - 35s - 40c Installation and Service Manual 7600585-01...
- Page 2 EG declaration of conformity The device complies with the standard type described in the EG declaration of conformity. It was manufactured and commissioned in accordance with European directives. The original of the declaration of compliance is available from the manufacturer.
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Page 3: Table Of Contents
Contents Introduction ....................6 Symbols used ............6 Abbreviations ............6 General ..............6 1.3.1 Manufacturer's liability ..........6 1.3.2 Installer's liability .............7 Homologations ............7 1.4.1 Certifications ............7 1.4.2 Equipment categories ..........9 1.4.3 Additional Directives ..........9 1.4.4 Factory test .............9 Safety instructions and recommendations ..........10 Safety instructions ..........10 Recommendations ..........10 Technical description ................12... - Page 4 Contents Choice of the location ........22 4.3.1 Data plate ..............22 4.3.2 Location of the boiler ..........22 4.3.3 Ventilation .............23 4.3.4 Main dimensions ...........24 Positioning the boiler .........25 Alternatives for hydraulic connections ....26 4.5.1 Connection of the underfloor heating ....26 4.5.2 Connection of a solar hot water tank .....26 4.5.3 Connection of an independent hot water...
- Page 5 4.11 Electrical diagram ..........50 4.12 Filling the system ..........51 4.12.1 Water treatment ............51 4.12.2 Filling the siphon ...........51 4.12.3 Filling the system ..........52 Commissioning ..................53 Control panel ............53 5.1.1 Functions of the keys ..........53 5.1.2 Meaning of the symbols on the display ....53 Check points before commissioning ....54 5.2.1 Preparing the boiler for commissioning ....54...
- Page 6 Contents Switching off the boiler ................71 Installation shutdown .........71 Frost protection ..........71 Switching off the central heating ......72 Shutting down domestic hot water production ............72 Checking and maintenance ..............73 Maintenance message ........73 Preventive maintenance with automated service message ..............73 7.2.1 Resetting the automatic maintenance message ..............74 7.2.2...
- Page 7 Spare parts ....................93 General ..............93 Spare parts ............93 040412 - 7600585-01...
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Page 8: Introduction
1. Introduction Calenta 25s - 28c - 35s - 40c Introduction Symbols used In these instructions, various danger levels are employed to draw the user's attention to particular information. In so doing, we wish to safeguard the user's safety, obviate hazards and guarantee correct operation of the appliance. -
Page 9: Installer's Liability
Calenta 25s - 28c - 35s - 40c 1. Introduction In the interest of customers, we are continuously endeavouring to make improvements in product quality. All the specifications stated in this document are therefore subject to change without notice. Our liability as the manufacturer may not be invoked in the following cases: 4 Failure to abide by the instructions on using the appliance. - Page 10 1. Introduction Calenta 25s - 28c - 35s - 40c The labels are not guaranteed if the boiler is adapted to G20 or G31. HR 107 gas approval (High efficiency heating) This means that the efficiency of the boiler when producing heating water is 107% higher than the Gaskeur HR criterion in relation to Hi.
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Page 11: Equipment Categories
Calenta 25s - 28c - 35s - 40c 1. Introduction This means that the boiler complies with the NOx Order and provisions on clean combustion. The boiler has a gas/air coupling combined with a fully premixed burner. For this reason, the emission of NOx and CO is as low as possible. -
Page 12: Safety Instructions And Recommendations
2. Safety instructions and recommendations Calenta 25s - 28c - 35s - 40c Safety instructions and recommendations Safety instructions DANGER If you smell gas: Do not use a naked flame, do not smoke, do not operate electrical contacts or switches ( doorbell, light, motor, lift, etc..). - Page 13 Calenta 25s - 28c - 35s - 40c 2. Safety instructions and recommendations Only remove the casing for maintenance and repair operations. Put the casing back in place after maintenance and repair operations. Instructions stickers The instructions and warnings affixed to the appliance must never be removed or covered and must remain legible during the entire lifespan of the appliance.
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Page 14: Technical Description
4 High efficiency heating. 4 Low pollutant emissions. Boiler type: 4 Calenta 25s - 35s: Heating only (Production of domestic hot water can be ensured by a separate hot water calorifier). 4 Calenta 28c - 40c: Heating and domestic hot water production. -
Page 15: Operating Principle
Calenta 25s - 28c - 35s - 40c 3. Technical description Calenta 35s - 40c Flue gas outlet Casing/air box Outlet for measuring combustion gases Mixer pipe Heating flow hose Air intake silencer Box for the control PCBs (accessory) Combined venturi and gas valve unit... -
Page 16: Combustion
3. Technical description Calenta 25s - 28c - 35s - 40c 3.3.2. Combustion The burner heats the heating water circulating in the heat exchanger. At a return temperature lower than around 55°C, the flue gases cool down to a temperature lower than the dew point, thus causing the condensation of the water vapour contained in the flue gases in the back side of the heat exchanger. -
Page 17: Regulation Of The Water Temperature
Calenta 25s - 28c - 35s - 40c 3. Technical description Celcia 10 qSense iSense It is possible to connect a 2-wire on/off thermostat to the boiler such as the Celcia 10 or a power stealing thermostat. The boiler output can be modulated by an OpenTherm system with an appropriate modulating thermostat such as the qSense or the iSense. -
Page 18: Skeleton Diagrams
3. Technical description Calenta 25s - 28c - 35s - 40c 3.3.9. Skeleton Diagrams Calenta 25s - 35s Heat exchanger (Central heating) Heating flow Heating return Shunt pump (Central heating) R000124-A Calenta 28c - 40c Heat exchanger (Central heating) Hydroblock... -
Page 19: Water Flow Rate
Calenta 25s - 28c - 35s - 40c 3. Technical description Calenta 35s - 40c 20 kW Manometric height central heating circuit 25 kW Water flow 30 kW 35 kW Parameters p"8 and p"9 are used to modify the pump settings: 4 If there are audible flowing noises in the system, the maximum pump speed must be lowered using parameter p"9 (First of all,... - Page 20 3. Technical description Calenta 25s - 28c - 35s - 40c Boiler type Calenta General EC indentification no. 0063BT3444 Flow rate setting Adjustable Modulating, Start/Stop, 0 - 10 V minimum- 5,0 - 24,1 5,0 - 24,1 6,3 - 34,0 6,3 - 34,0...
- Page 21 Calenta 25s - 28c - 35s - 40c 3. Technical description Boiler type Calenta Flue gas temperature minimum- °C 30 - 80 30 - 85 30 - 75 30 - 80 maximum Maximum counter pressure Characteristics of the heating circuit...
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Page 22: Installation
4. Installation Calenta 25s - 28c - 35s - 40c Installation Regulations governing installation WARNING Installation of the appliance must be done by a qualified engineer in accordance with prevailing local and national regulations. Installation must also respect the following points:... -
Page 23: Accessories
Connection set for coupling to the heat recycling system Cleaning accessories for the heat exchanger (central heating) Cleaning kit for the plate heat exchanger (DHW) Maintenance box Recom communication kit Installation kit for the water / gas connection if replacing Remeha Quinta boilers 040412 - 7600585-01... -
Page 24: Choice Of The Location
4. Installation Calenta 25s - 28c - 35s - 40c Choice of the location 4.3.1. Data plate The data plate located on top of the boiler provides important information on the appliance: serial number, model, gas category, etc. T001539-B 4.3.2. -
Page 25: Ventilation
Calenta 25s - 28c - 35s - 40c 4. Installation n Safety rating Bathtub or shower tray Zones Breakdown of the exterior zone For safety rating IP X4D, installation in the bathroom is possible in zones 2 and 3 and in the breakdown of the exterior zone. -
Page 26: Main Dimensions
4. Installation Calenta 25s - 28c - 35s - 40c 4.3.4. Main dimensions 257,5 257,5 T000754-C Connection of the combustion gas exhaust pipe; Ø 80 mm Connection of the air intake pipe; Ø 80 mm ê Safety valve outlet pipe; Ø 25 mm Condensates discharge;... -
Page 27: Positioning The Boiler
Calenta 25s - 28c - 35s - 40c 4. Installation Positioning the boiler The boiler is delivered with a mounting template. A suspension clamp situated at the rear of the casing enables the boiler to be directly suspended on the mounting bracket. -
Page 28: Alternatives For Hydraulic Connections
4. Installation Calenta 25s - 28c - 35s - 40c Alternatives for hydraulic connections 4.5.1. Connection of the underfloor heating Boiler Expansion vessel Stopcock Regulator valve Filling/drainage valve Underfloor heating Heating by radiators The boiler can be connected directly to an underfloor heating circuit. -
Page 29: Connection Of An Independent Hot Water Tank
Calenta 25s - 28c - 35s - 40c 4. Installation 4.5.3. Connection of an independent hot water tank The standard version of the heating-only type of boiler is fitted with a command for regulation of the hot water tank circuit. The command is adjusted to switch preferentially to the hot water tank circuit. -
Page 30: Geyser Use
4. Installation Calenta 25s - 28c - 35s - 40c External three-way valve Boiler Independent hot water tank DHW sensor Air vent kit of the hot water tank Safety unit Expansion vessel Heating-Installation 3-way valve SCU-X02 control PCB Control SCU-X02 must be used to install the three-way valve outside of the boiler (Accessory). -
Page 31: Solo Use
Calenta 25s - 28c - 35s - 40c 4. Installation 4.5.5. Solo use Boiler Expansion vessel Stopcock Filling/drainage valve Heating by radiators The combi boiler can also be used solely for central heating operation. The hot water function has to be switched off for this purpose, using parameter p3. -
Page 32: Connection Of The Heating Circuit
4. Installation Calenta 25s - 28c - 35s - 40c 4.6.2. Connection of the heating circuit 1. Remove the anti-dust plug located on the heating outlet connection { under the boiler. 2. Connect the heating water outlet pipe to the heating flow connection. -
Page 33: Hydraulic Connection Of The Water Circuit For Domestic Use
Calenta 25s - 28c - 35s - 40c 4. Installation 4.6.3. Hydraulic connection of the water circuit for domestic use 1. Remove the anti-dust plug located on the domestic cold water connection x under the boiler. 2. Remove the anti-dust plug located on the domestic hot water connection y under the boiler. -
Page 34: Gas Connection
4. Installation Calenta 25s - 28c - 35s - 40c Gas connection 1. Remove the anti-dust plug located on the gas connection GAS/ GAZ under the boiler. 2. Connect the gas inlet pipe. 3. Mount a gas isolation valve on this pipe, directly under the boiler. -
Page 35: Outlets
In the case of such passage via the outside wall directly above the boiler, use the Remeha kit for passage via an outside wall. This is available as an accessory. -
Page 36: Lengths Of The Air/Flue Gas Pipes
4. Installation Calenta 25s - 28c - 35s - 40c For open exhaust of combustion gases above the roof, the vent must always be provided with a suitable stainless steel wire grill. 4.8.3. Lengths of the air/flue gas pipes To define the maximum final length, you must deduct the pipe length in accordance with the reduction table. - Page 37 Calenta 25s - 28c - 35s - 40c 4. Installation n Room sealed flue (C13, C33, C43, C63, C93) If using a room sealed version, it is necessary to connect both the combustion gas exhaust and the air-supply opening (parallel). For the application of air discharge and combustion gas discharge piping with a diameter other than 80 mm, a reducer should be used.
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Page 38: Specific Air/Flue Gas Applications
4. Installation Calenta 25s - 28c - 35s - 40c 4.8.4. Specific air/flue gas applications If the boiler has been modified, for example: high pressure systems WTW coupling CLV overpressure (combusted gas discharge systems) It is necessary to mention on the sticker provided: This boiler has been set for.. -
Page 39: Air/Exhaust Adapter
Calenta 25s - 28c - 35s - 40c 4. Installation 4 Connection of the combustion gas exhaust directly to the buildings brick chimneys or flues is forbidden for condensation reasons. 4 If flues or chimneys are to be used, they must have an airtight construction with thick walls and be made from rigid aluminium or stainless steel. -
Page 40: Connection Of The Combustion Gas Exhaust Pipe
4. Installation Calenta 25s - 28c - 35s - 40c 4.8.7. Connection of the combustion gas exhaust pipe Insertion depth 3 cm Mounting 1. Fit the combustion product discharge conduit. 80mm 2. Fit together the combustion gas exhaust pipes, without welding. -
Page 41: Electrical Connections
Calenta 25s - 28c - 35s - 40c 4. Installation Electrical connections 4.9.1. Control unit The boiler is not line- and neutral sensitive. The boiler is fully pre- wired. All external connections can be made on the connection connector (low voltage). The main characteristics of the control unit are described in the table below. -
Page 42: Recommendations
4. Installation Calenta 25s - 28c - 35s - 40c 4.9.2. Recommendations WARNING Only qualified professionnals may carry out electrical connections, always with the power off. The boiler is entirely pre-wired. Do not modify the connections inside the control panel. -
Page 43: Standard Control Pcb
Calenta 25s - 28c - 35s - 40c 4. Installation 4.9.3. Standard control PCB Various thermostats and controllers can be connected to the standard control PCB (PCU) (X12 connector block). The possible connections on the standard control PCB are described in the following paragraphs. -
Page 44: Connecting The Room Thermostat
4. Installation Calenta 25s - 28c - 35s - 40c 4.9.4. Connecting the room thermostat n Connecting modulating controller OpenTherm regulator The boiler is fitted with a OpenTherm connection as standard. As a result, modulating OpenTherm room controllers can be connected without any further adjustments. -
Page 45: Connecting The Outside Temperature Sensor
Calenta 25s - 28c - 35s - 40c 4. Installation 4.9.5. Connecting the outside temperature sensor Outside sensor An outside sensor can be connected to the Tout terminals of the connector. Where there is an on/off thermostat controller, the boiler will control the temperature with the set point of the internal heating curve. -
Page 46: Connecting The Calorifier Sensor/Thermostat
4. Installation Calenta 25s - 28c - 35s - 40c n Frost protection in combination with an outside sensor The central heating system can also be protected against frost in combination with an outside sensor. The radiator valve in a room where there is a risk of frost must, however, be open. -
Page 47: Pc/Laptop Connection
Calenta 25s - 28c - 35s - 40c 4. Installation 4.9.8. PC/Laptop connection A PC or Laptop can be connected to the telephone connector using the optional Recom interface. Using the Recom PC/Laptop service software, you can enter, change and read out various boiler settings. -
Page 48: 4.10 Optional Electrical Connections
4. Installation Calenta 25s - 28c - 35s - 40c 4.10 Optional electrical connections 4.10.1. Connection options for the 0-10 V control PCB (IF-01) The IF-01 control PCB can be built into the instrument box or the housing for the control PCBs. Refer to the instructions supplied with the product. -
Page 49: Connection Possibilities For The Pcb (Scu- S02)
Calenta 25s - 28c - 35s - 40c 4. Installation n Analogue heat output-based control (%) The 0-10V signal controls the boiler output between 0% and 100%. The minimum and maximum values are limited. The minimum output is linked to the boiler's modulation depth. The output varies between the minimum and maximum value on the basis of the value determined by the controller. - Page 50 4. Installation Calenta 25s - 28c - 35s - 40c The status indicator D3 at the top right of the control PCB indicates the status: 4 Continuous signal: PCB working normally 4 Flashing signal: No connection 4 No signal: No voltage or faulty PCB (Check the wiring)
- Page 51 Calenta 25s - 28c - 35s - 40c 4. Installation n Operation signal and failure signal (Status) The alarm or operation signal is selected using parameter p40. 4 If the boiler is operating, the operation signal can be switched via a potential-free contact (maximum 230 VAC, 1 A) on the No and C terminals of the connector.
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Page 52: 4.11 Electrical Diagram
4. Installation Calenta 25s - 28c - 35s - 40c 4.11 Electrical diagram 3 2 1 2 3 4 1 1 2 3 1 2 3 1 2 3 2 3 4 5 GN/YW 1 3 2 3 1 2... -
Page 53: 4.12 Filling The System
Calenta 25s - 28c - 35s - 40c 4. Installation 4.12 Filling the system 4.12.1. Water treatment In most cases, the boiler and the central heating installation can be filled with normal tap water and no water treatment will be necessary. -
Page 54: Filling The System
4. Installation Calenta 25s - 28c - 35s - 40c 4.12.3. Filling the system CAUTION Before filling, open the valves on every radiator in the installation. In order to be able to read off the water pressure from the boiler display, the boiler must be switched on. -
Page 55: Commissioning
Calenta 25s - 28c - 35s - 40c 5. Commissioning Commissioning Control panel 5.1.1. Functions of the keys Display > [Escape] or J key D Heating temperature key or [-] N DHW temperature key or [+] S [Enter] or cancel d Key lock-out... -
Page 56: Check Points Before Commissioning
5. Commissioning Calenta 25s - 28c - 35s - 40c Manual mode: Yellow display with the symbols: $ + K + Z (Maintenance message). Boiler is set to manual operation. DHW programme deactivated: Water pressure: The DHW mode is deactivated. -
Page 57: Gas Circuit
Calenta 25s - 28c - 35s - 40c 5. Commissioning 5.2.2. Gas circuit WARNING Ensure that the boiler is switched off. 1. Open the main gas supply. 2. Unscrew the two screws located under the front panel by a quarter turn and remove the panel. - Page 58 5. Commissioning Calenta 25s - 28c - 35s - 40c 6. Set the controls (thermostats, control system) so that they request heat. 7. The start-up cycle begins and cannot be interrupted. During the start-up cycle, the display shows the following information: A short test where all segments of the display are visible.
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Page 59: Gas Settings
Calenta 25s - 28c - 35s - 40c 5. Commissioning Gas settings 5.4.1. Adapting to another gas type WARNING Only a qualified engineer may carry out the following operations. The boiler is preset in the factory to operate on natural gas G25 (Gas... - Page 60 5. Commissioning Calenta 25s - 28c - 35s - 40c 3. Set the boiler to full load. Press the two B keys simultaneously. The display shows h3 . The symbol B appears. 4. Measure the percentage of O or CO in the flue gases (Front ºCºFh...
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Page 61: Setting The Air/Gas Ratio (Part Load)
Calenta 25s - 28c - 35s - 40c 5. Commissioning 5.4.3. Setting the air/gas ratio (Part load) 1. Unscrew the plug of the flue gas measurement point. 2. Connect the flue gas analyser. WARNING Ensure that the opening around the sensor is completely sealed when taking measurements. -
Page 62: Basic Setting For The Gas/Air Ratio
5. Commissioning Calenta 25s - 28c - 35s - 40c control and setting values at part load for G31 (Propane) Boiler type Setting value Checking value Calenta 25s 5,8 ± 0,3 9,9 ± 0,2 5,8 ± 0,3 9,9 ± 0,2 Calenta 28c 5,8 ±... -
Page 63: Reading Out Measured Values
Calenta 25s - 28c - 35s - 40c 5. Commissioning 9. Check the tightness of the flue gases evacuation and air inlet connections. 10.Checking the hydraulic pressure. If necessary, top up the water level in the heating system (recommended hydraulic pressure between 1,5 and 2 bar). -
Page 64: Readout From The Hour Counter And Percentage Of Successful Starts
5. Commissioning Calenta 25s - 28c - 35s - 40c The current values can be read as follows: 1. Press the two f keys simultaneously. The symbol Q flashes. 2. Confirm using key S . 5t is displayed, alternating with the current status 3 (for example). -
Page 65: Status And Sub-Status
Calenta 25s - 28c - 35s - 40c 5. Commissioning 5.6.3. Status and sub-status The information menu Q gives the following status and sub-status numbers: State 5t Sub-status 5v Rest 0 Rest Boiler start (Heat demand) 1 Anti-hunting 2 Control three-way valve... -
Page 66: Changing The Settings
5. Commissioning Calenta 25s - 28c - 35s - 40c Changing the settings The boiler control panel is set for the most common heating systems. With these settings, practically all heating systems operate correctly. The user or installer can optimise the parameters according to own preferences. - Page 67 Calenta 25s - 28c - 35s - 40c 5. Commissioning Factory setting Parameter Description Adjustment range Calenta 25s 28c 35s 40c G25 (Gas L) (x100 rpm) G20 (Gas H) (x100 rpm) Minimum fan speed (Heating G31 (Propane) +DHW) (x100 rpm)
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Page 68: Modification Of The User-Level Parameters
5. Commissioning Calenta 25s - 28c - 35s - 40c Factory setting Parameter Description Adjustment range Calenta 25s 28c 35s 40c Release waiting time 0 to 255 seconds Gas valve switching time 0 to 255 seconds 0 = Operation signal... -
Page 69: Modification Of The Installer-Level Parameters
Calenta 25s - 28c - 35s - 40c 5. Commissioning The parameters p1 to p8 are changed in the same way as p1. After step 2, use the [+] key to move to the required parameter. The parameters p1 (the maximum heating water... -
Page 70: Setting The Maximum Heat Input For Central Heating Operation
5. Commissioning Calenta 25s - 28c - 35s - 40c 5.7.4. Setting the maximum heat input for central heating operation Calenta 25s Maximum heat input Factory setting Power input (kW) Fan rotation speed (rpm) 1500 2000 2500 3000 3500 4000... -
Page 71: Return To The Factory Settings
Calenta 25s - 28c - 35s - 40c 5. Commissioning See the graphs for the relationship between heat input and speed for natural gas. The speed can be changed using parameter p17. To do this, proceed as follows: 1. Press the two keys f simultaneously and then key [+] until the symbol ? flashes on the menu bar. -
Page 72: Carrying Out An Auto-Detect
5. Commissioning Calenta 25s - 28c - 35s - 40c 5.7.6. Carrying out an auto-detect After removing a control PCB, an auto-detect must be carried out. To do this, proceed as follows: 1. Press the two keys f simultaneously and then key [+] until the symbol ? flashes on the menu bar. -
Page 73: Switching Off The Boiler
Calenta 25s - 28c - 35s - 40c 6. Switching off the boiler Switching off the boiler Installation shutdown If the central heating system is not used for a long period, we recommend switching the boiler off. 4 Switch the On/Off switch to Off. -
Page 74: Switching Off The Central Heating
6. Switching off the boiler Calenta 25s - 28c - 35s - 40c Switching off the central heating The central heating can be deactivated via the "quick menu". To do this, proceed as follows: 1. Press the D key 1 times. -
Page 75: Checking And Maintenance
Calenta 25s - 28c - 35s - 40c 7. Checking and maintenance Checking and maintenance Maintenance message Boiler maintenance is kept to a minimum. Nevertheless, we recommend having the boiler inspected and serviced at regular intervals. To determine the best time for maintenance, the boiler is fitted with a function that automatically signals any maintenance to be carried out. -
Page 76: Resetting The Automatic Maintenance Message
For an interim service it is advisable to read out in the boiler service menu what maintenance service should be carried out. Use the indicated Remeha service sets (A, B or C). This service message must be prevented by carrying out a reset. Start the next service interval. -
Page 77: Standard Inspection And Maintenance Operations
Calenta 25s - 28c - 35s - 40c 7. Checking and maintenance Standard inspection and maintenance operations CAUTION During inspection and maintenance operations, always replace all gaskets on the parts removed. Before carrying out any work, check whether the boiler has... -
Page 78: Checking The Tightness Of The Flue Gas Evacuation And Air Inlet Connections
7. Checking and maintenance Calenta 25s - 28c - 35s - 40c 7.3.4. Checking the tightness of the flue gas evacuation and air inlet connections Check the tightness of the flue gases evacuation and air inlet connections. T001525-A 7.3.5. Checking combustion The check on combustion is done by measuring the percentage of in the flue gas discharge flue. -
Page 79: Checking The Automatic Air Vent
Calenta 25s - 28c - 35s - 40c 7. Checking and maintenance 7.3.6. Checking the automatic air vent 1. Cut the power supply to the boiler. 2. Close the gas valve on the boiler. 3. Close the main gas inlet valve. -
Page 80: Checking The Burner And Cleaning The Heat Exchanger
7. Checking and maintenance Calenta 25s - 28c - 35s - 40c 7.3.9. Checking the burner and cleaning the heat exchanger CAUTION During inspection and maintenance operations, always replace all gaskets on the parts removed. 1. Remove the air inlet flue on the venturi. -
Page 81: Specific Maintenance Operations
Calenta 25s - 28c - 35s - 40c 7. Checking and maintenance Specific maintenance operations CAUTION After maintenance operations, fill in the corresponding checklist in the maintenance log provided . If the standard inspection and maintenance operations have revealed the necessity to carry out additional maintenance work, proceed as follows, depending on the nature of the work: 7.4.1. - Page 82 7. Checking and maintenance Calenta 25s - 28c - 35s - 40c n Cleaning the plate exchanger If descaling of the plate exchanger is necessary, proceed as follows: 1. Close the main water valve. 2. Drain the boiler. 3. Remove the air vent hose above the siphon.
- Page 83 Calenta 25s - 28c - 35s - 40c 7. Checking and maintenance n Cleaning the domestic water cartridge If cleaning or replacement of the water filter cartridge is necessary, proceed as follows: 1. Close the main water valve. 2. Drain the boiler.
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Page 84: Replacing The 3-Way Valve
7. Checking and maintenance Calenta 25s - 28c - 35s - 40c 7.4.3. Replacing the 3-way valve If it becomes necessary to replace the 3-way valve, proceed as follows: 1. Close the main water valve 2. Drain the boiler. 3. Remove the air vent hose above the siphon. -
Page 85: Replacing The Non-Return Valve
Calenta 25s - 28c - 35s - 40c 7. Checking and maintenance 7.4.4. Replacing the non-return valve Replace the nonreturn valve when faulty or when the maintenance kit contains one. To do this, proceed as follows: 1. Remove the air inlet flue on the venturi. -
Page 86: Assembling The Boiler
7. Checking and maintenance Calenta 25s - 28c - 35s - 40c 7.4.5. Assembling the boiler 1. Follow the procedure in reverse to re-assemble all of the components. CAUTION During inspection and maintenance operations, always replace all gaskets on the parts removed. -
Page 87: Troubleshooting
Calenta 25s - 28c - 35s - 40c 8. Troubleshooting Troubleshooting Error codes The boiler is fitted with an electronic regulation and control unit. The heart of the control system is a microprocessor, the Comfort © , which controls the boiler and also protects the boiler. If a... - Page 88 8. Troubleshooting Calenta 25s - 28c - 35s - 40c Error Description Probable causes Checking / solution code Check the wiring Replace the sensor if necessary Bad connection Vent the air in the heating system Temperature of heat Sensor fault...
- Page 89 Calenta 25s - 28c - 35s - 40c 8. Troubleshooting Error Description Probable causes Checking / solution code Check cabling of ignition transformer Check the ionization/ignition electrode Check breakdown to earth No ignition Check the condition of the burner set...
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Page 90: Shutdowns And Lock-Outs
8. Troubleshooting Calenta 25s - 28c - 35s - 40c Error Description Probable causes Checking / solution code Bad connection Check the wiring Communication error e[38 with the SCU PCB Defective SCU PCB Replace SCU PCB Bad connection Check the wiring... - Page 91 Calenta 25s - 28c - 35s - 40c 8. Troubleshooting The boiler starts up again automatically when the reason for the blocking has been removed. Shutdown Description Probable causes Checking / solution code Reset df and dV Parameter error on the...
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Page 92: Error Memory
8. Troubleshooting Calenta 25s - 28c - 35s - 40c Shutdown Description Probable causes Checking / solution code Configuration fault or PSU Wrong PCU PCB for this Replace the PCU PCB 5v[18 PCB not recognised boiler Configuration fault or parameters df-dV... -
Page 93: Error Readout Memorised
Calenta 25s - 28c - 35s - 40c 8. Troubleshooting 8.3.1. Error readout memorised 1. Press the two keys f simultaneously and then key [+] until the symbol c flashes on the menu bar. 2. Select the installers menu using the key S . c0de appears on the display. -
Page 94: Deletion Of The Error Display
8. Troubleshooting Calenta 25s - 28c - 35s - 40c 8.3.2. Deletion of the error display 1. Press the two keys f simultaneously and then key [+] until the symbol c flashes on the menu bar. 2. Select the installers menu using the key S . c0de appears on the display. - Page 95 Send the component to be replaced to the Returned Goods Department at Remeha when the corresponding part falls under the warranty terms (see the general terms and conditions of sale and supply).
- Page 96 9. Spare parts Calenta 25s - 28c - 35s - 40c Calenta 25s, 28c 2022 2026 2028 2027 2028 2025 1003 3005 2029 3003 2019 2018 2016 2024 2017 2001 2013 2014 2012 2015 2011 2015 3004 2034 3002 4016...
- Page 97 Calenta 25s - 28c - 35s - 40c 9. Spare parts Calenta 35s, 40c 2022 2027 2028 2025 2025 1003 3005 2029 3003 2024 2016 2019 3007 2018 2013 2012 2017 2014 2015 2011 4008 3004 2034 2033 4007 2001...
- Page 98 9. Spare parts Calenta 25s - 28c - 35s - 40c 040412 - 7600585-01...
- Page 100 Remeha B.V. Postbus 32 7300 AA Apeldoorn Tel: +31 55 5496969 Fax: +31 55 5496496 Internet: http://nl.remeha.com E-mail: remeha@remeha.com T001778-C T001800-B © Copyright All technical and technological information contained in these technical instructions, as well as any drawings and technical descriptions supplied, remain our property and shall not be multiplied without our prior consent in writing.
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Questions and answers
Can I set radiator temerature from boiler , without using isense thermostat
YES. You can set the radiator temperature on a REMEHA Calenta 25s boiler without using the iSense thermostat by adjusting the boiler's parameters directly. The boiler has a modulating control system that allows for temperature adjustments independent of the thermostat.
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How can I connect to Remeha isense thermostat
To connect the Remeha Calenta 25s to the Remeha iSense thermostat, use the Remeha iSense integration kit. Ensure proper installation by following the instructions provided with the kit.
This answer is automatically generated