REMEHA Calenta 25s, Calenta 40c, Calenta 28c, Calenta 35s Installation And Service Manual

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High-efficiency wall-hung condensing gas boilers

Calenta 25s - 28c - 35s - 40c

Netherlands

Installation and Service Manual

7600585-01

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.

Contents

1 Introduction ................................................................................................6

1.1 Symbols used .......................................................6

1.2 Abbreviations ........................................................6

1.3 General ..................................................................6

1.3.1 Manufacturer's liability .............................................6

1.3.2 Installer's liability .....................................................7

1.4 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

2 Safety instructions and recommendations ............................................10

2.1 Safety instructions .............................................10

2.2 Recommendations ..............................................10

3 Technical description ..............................................................................12

3.1 General description ............................................12

3.2 Main parts ............................................................12

3.3 Operating principle .............................................13

3.3.1 Gas/air setting .......................................................13

3.3.2 Combustion ...........................................................14

3.3.3 Heating and domestic hot water production ..........14

3.3.4 Control system ......................................................14

3.3.5 Adjustment ............................................................14

3.3.6 Regulation of the water temperature .....................15

3.3.7 Protection against a shortage of water ..................15

3.3.8 Maximum temperature protection .........................15

3.3.9 Skeleton Diagrams ................................................16

3.3.10 Shunt pump ...........................................................16

3.3.11 Water flow rate ......................................................17

3.4 Technical specifications ....................................17

4 Installation ................................................................................................20

4.1 Regulations governing installation ...................20

4.2 Package list .........................................................20

4.2.1 Standard delivery ..................................................20

4.2.2 Accessories ...........................................................21

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Contents

4.3 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

4.4 Positioning the boiler .........................................25

4.5 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

tank .......................................................................27

4.5.4 Geyser use ............................................................28

4.5.5 Solo use ................................................................29

4.6 Hydraulic connections .......................................29

4.6.1 Flushing the system ..............................................29

4.6.2 Connection of the heating circuit ...........................30

4.6.3 Hydraulic connection of the water circuit for domestic

use ........................................................................31

4.6.4 Connecting the expansion vessel .........................31

4.6.5 Connecting the condensate discharge pipe ..........31

4.7 Gas connection ...................................................32

4.8 Connections for the air and exhaust

pipes ....................................................................32

4.8.1 Classification .........................................................32

4.8.2 Outlets ...................................................................33

4.8.3 Lengths of the air/flue gas pipes ...........................34

4.8.4 Specific air/flue gas applications ...........................36

4.8.5 Additional Directives ..............................................36

4.8.6 Air/Exhaust adapter ...............................................37

4.8.7 Connection of the combustion gas exhaust

pipe .......................................................................38

4.8.8 Connection of the air intake pipe ...........................38

4.9 Electrical connections ........................................39

4.9.1 Control unit ............................................................39

4.9.2 Recommendations ................................................40

4.9.3 Standard control PCB ...........................................41

4.9.4 Connecting the room thermostat ...........................42

4.9.5 Connecting the outside temperature sensor ........43

4.9.6 Connect frost protection ........................................43

4.9.7 Connecting the calorifier sensor/thermostat .........44

4.9.8 PC/Laptop connection ...........................................45

4.9.9 Shutdown input .....................................................45

4.9.10 Release input ........................................................45

040412 - 7600585-01

4.10 Optional electrical connections ........................46

4.10.1 Connection options for the 0-10 V control PCB

(IF-01) ...................................................................46

4.10.2 Connection possibilities for the PCB (SCU-

S02) .......................................................................47

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

5 Commissioning ........................................................................................53

5.1 Control panel .......................................................53

5.1.1 Functions of the keys ............................................53

5.1.2 Meaning of the symbols on the display .................53

5.2 Check points before commissioning ................54

5.2.1 Preparing the boiler for commissioning .................54

5.2.2 Gas circuit .............................................................55

5.2.3 Hydraulic circuit .....................................................55

5.2.4 Electrical connections ...........................................55

5.3 Commissioning the boiler ..................................55

5.4 Gas settings ........................................................57

5.4.1 Adapting to another gas type ................................57

5.4.2 Setting the air/gas ratio (Full load) ........................57

5.4.3 Setting the air/gas ratio (Part load) ......................59

5.4.4 Basic setting for the gas/air ratio ...........................60

5.5 Checks and adjustments after

commissioning ...................................................60

5.5.1 Finalizing work ......................................................60

5.6 Reading out measured values ...........................61

5.6.1 Reading the various current values .......................61

5.6.2 Readout from the hour counter and percentage of

successful starts ....................................................62

5.6.3 Status and sub-status ...........................................63

5.7 Changing the settings ........................................64

5.7.1 Parameter descriptions .........................................64

5.7.2 Modification of the user-level parameters .............66

5.7.3 Modification of the installer-level parameters ........67

5.7.4 Setting the maximum heat input for central heating

operation ...............................................................68

5.7.5 Return to the factory settings ................................69

5.7.6 Carrying out an auto-detect ...................................70

5.7.7 Setting the manual mode ......................................70

5.7.8 Setting the legionella protection function ..............70

040412 - 7600585-01

Contents

6 Switching off the boiler ............................................................................71

6.1 Installation shutdown .........................................71

6.2 Frost protection ..................................................71

6.3 Switching off the central heating ......................72

6.4 Shutting down domestic hot water

production ...........................................................72

7 Checking and maintenance .....................................................................73

7.1 Maintenance message ........................................73

7.2 Preventive maintenance with automated service

message ..............................................................73

7.2.1 Resetting the automatic maintenance

message ................................................................74

7.2.2 Dealing with the next maintenance message and

starting the new maintenance period ....................74

7.3 Standard inspection and maintenance

operations ...........................................................75

7.3.1 Checking the hydraulic pressure ...........................75

7.3.2 Checking the ionization current .............................75

7.3.3 Checking the transfer capacity ..............................75

7.3.4 Checking the tightness of the flue gas evacuation and

air inlet connections ..............................................76

7.3.5 Checking combustion ............................................76

7.3.6 Checking the automatic air vent ............................77

7.3.7 Checking the safety valve .....................................77

7.3.8 Checking the siphon ..............................................77

7.3.9 Checking the burner and cleaning the heat

exchanger .............................................................78

7.4 Specific maintenance operations ......................79

7.4.1 Replacing the ionization/ignition electrode ............79

7.4.2 Cleaning the plate exchanger (domestic hot water

end) and the water filter cartridge .........................79

7.4.3 Replacing the 3-way valve ....................................82

7.4.4 Replacing the non-return valve .............................83

7.4.5 Assembling the boiler ............................................84

8 Troubleshooting .......................................................................................85

040412 - 7600585-01

8.1 Error codes ..........................................................85

8.2 Shutdowns and lock-outs ..................................88

8.2.1 Blockage ...............................................................88

8.2.2 Blocking .................................................................88

8.3 Error memory ......................................................90

8.3.1 Error readout memorised ......................................91

8.3.2 Deletion of the error display ..................................92

9 Spare parts ................................................................................................93

9.1 General ................................................................93

9.2 Spare parts ..........................................................93

040412 - 7600585-01

1. Introduction

1 Introduction

1.1 Symbols used

Calenta 25s - 28c - 35s - 40c

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.

DANGER

Risk of a dangerous situation causing serious physical injury.

WARNING

Risk of a dangerous situation causing slight physical injury.

1.2 Abbreviations

1.3 General

CAUTION

Risk of material damage.

Signals important information.

¼ Signals a referral to other instructions or other pages in the instructions.

4 3CE: Collective conduit for sealed boiler

4 Central heating: Central heating

4 COP: Energy performance

4 DHW: Domestic hot water

4 HRU: Heat Recovery Unit

1.3.1. Manufacturer's liability

Our products are manufactured in compliance with the requirements of the various applicable European Directives. They are therefore

delivered with [ marking and all relevant documentation.

040412 - 7600585-01

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.

4 Faulty or insufficient maintenance of the appliance.

4 Failure to abide by the instructions on installing the appliance.

1.3.2. Installer's liability

The installer is responsible for the installation and inital start up of the appliance. The installer must respect the following instructions:

4 Read and follow the instructions given in the manuals provided

with the appliance.

4 Carry out installation in compliance with the prevailing legislation

and standards.

4 Perform the initial start up and carry out any checks necessary.

4 Explain the installation to the user.

4 If a maintenance is necessary, warn the user of the obligation to

check the appliance and maintain it in good working order.

4 Give all the instruction manuals to the user.

1.4 Homologations

1.4.1. Certifications

CE identification no

NOx classification

Type of connection (Flue gas outlet)

Depending on the type of appliance and the gross heat requirements for domestic water in accordance with NEN 5128, efficiency values up to 0,825 can be applied to determine EPC.

Approval labels for gas

The boiler has been given several approval labels for gas. Stichting Energie Prestatiekeur grants these independent labels on performance to gas consumption appliances that meet specific provisions on a certain number of aspects (efficiency, environmental friendliness, comfort). The labels have the following meaning:

PIN 0063BT3444

5 (EN 297 pr A3, EN 656)

B23 , B C

, B33 , C13 , C33 , C43 , C53 , C63 , C83 ,

23P

040412 - 7600585-01

T001057-A

T001058-A

T001055-A

T001795-A

T001059-A

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. This means that the boiler is economical and therefore less costly and more environmentally friendly.

HRww gas approval (High efficiency hot water)

This implies that the hot water/heating boiler produces hot water economically and efficiently, without wasting energy or water therefore.

CW 4 gas approval (Hot water comfort)

This means that, for the preparation of hot water, the Calenta 28c satisfies application class 4. With the application of class 4, the Calenta 28c is appropriate for:

4 A draw-off flow rate of at least 7,5 l/min at 60°C.

4 A shower function from 6 l/min up to at least 12,5 l/min at 40°C.

4 Filling a bathtub in less than 11 minutes with 120 litres of water at

40°C on average. The simultaneity of these functions is not a requirement.

Parameters for which the performance of the Calenta 28c boiler complies with the Hot Water Comfort classification:

4 Rotation speed on start-up 3000 rpm.

4 Maximum DHW rate 6200 rpm.

4 Energy-saving mode: Stop.

CW 5 gas approval (Hot water comfort)

This means that, for the preparation of hot water, the Calenta 40c satisfies application class 5. With the application of class 5, the Calenta 40c is appropriate for:

4 Hot water comfort.

4 A shower function from 6 l/min up to at least 12,5 l/min at 40°C.

4 Filling a bathtub in less than 10 minutes with 150 litres of water at

40 °C on average. The simultaneity of these functions is not a requirement.

Parameters for which the performance of the Calenta 40c boiler complies with the Hot Water Comfort classification:

4 Rotation speed on start-up 4000 rpm.

4 Maximum DHW rate 6800 rpm.

4 Energy-saving mode: Stop.

SV gas approval (Clean combustion)

040412 - 7600585-01

T001779-B

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.

NZ gas approval (Solar water heater reheating)

This implies that the hot water/heating boiler can operate on reheating for solar water heaters. The label (solar water heater reheating) is valid in combination with the connection kit for solar water heaters. Owing to the possible formation of legionella, the boiler must not be shut down or the DHW temperature set below 60°C.

1.4.2. Equipment categories

Gas category

, I

2L3P

Gas type Connection pressure (mbar)

G20 (Gas H) 20

G25 (Gas L) 25

G31 (Propane) 30/50

The boiler is preset in the factory to operate on natural gas G25 (Gas L).

1.4.3. Additional Directives

Apart from the legal provisions and Directives, the additional Directives described in these instructions must also be observed.

For all provisions and Directives referred to in these instructions, it is agreed that all addenda or subsequent provisions will apply at the time of installation.

1.4.4. Factory test

Before leaving the factory, each boiler is set for optimum performance and tested to check the following items:

040412 - 7600585-01

4 Electrical safety

4 Adjustment (CO2)

4 Domestic hot water mode (Only on models with domestic hot water

production)

4 Water tightness

4 Gas tightness

4 Parameter settings

2. Safety instructions and recommendations

2 Safety instructions and

recommendations

2.1 Safety instructions

DANGER

If you smell gas:

1. Do not use a naked flame, do not smoke, do not operate electrical contacts or switches ( doorbell, light, motor, lift, etc..).

2. Shut off the gas supply.

3. Open the windows.

4. Trace possible leaks and seal them immediately.

5. If the gas leak is before the gas meter, contact the gas supplier.

Calenta 25s - 28c - 35s - 40c

2.2 Recommendations

DANGER

If you smell flue gases:

1. Switch the appliance off.

2. Open the windows.

3. Trace possible leaks and seal them immediately.

WARNING

4 Installation and maintenance of the boiler must be

carried out by a qualified professional in compliance with prevailing local and national regulations.

4 When working on the boiler, always disconnect the

boiler from the mains and close the main gas inlet valve.

4 After maintenance or repair work, check all

installations to ensure that there are no leaks.

CAUTION

The boiler must be installed in a frost-free environment.

Keep this document close to the place where the boiler is installed.

Casing components

040412 - 7600585-01

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. Immediately replace damaged or illegible instructions and warning stickers.

Modifications

Modifications may only be made to the boiler after the written permission of Remeha to do so.

040412 - 7600585-01

T000822-B T000822-D

1 21

3. Technical description Calenta 25s - 28c - 35s - 40c

3 Technical description

3.1 General description

High-efficiency wall-hung condensing gas boilers

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.

3.2 Main parts

Calenta 25s - 28c

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

Flow end hydroblock

Safety valve outlet pipe

Siphon

Instrument box

Shunt pump

Return end hydroblock

Plate heat exchanger (DHW) (Only on models with domestic hot water production)

3-way valve (Only on models with domestic hot water production)

Condensate receiver tank

Fan

Heat exchanger (Central heating)

Ignition/ionization electrode

Air intake

040412 - 7600585-01

T002886-C

1 21

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

Flow end hydroblock

Safety valve outlet pipe

Siphon

Instrument box

Shunt pump

Return end hydroblock

Plate heat exchanger (DHW) (Only on models with domestic hot water production)

3-way valve (Only on models with domestic hot water production)

3.3 Operating principle

Condensate receiver tank

Fan

Heat exchanger (Central heating)

Ignition/ionization electrode

Air intake

3.3.1. Gas/air setting

The casing fitted to the boiler is also used as an air box. Air is sucked in by the fan and gas injected into the venturi by the fan intake. The fan rotation speed is set according to the settings parameters, the thermal energy requirement and the temperatures measured by the temperature sensors. The gas and air are mixed in the venturi. The gas/air ratio ensures that the quantities of gas and air are adjusted to each other. This provides optimum combustion on the entire output range. The gas/air mixture is fed into the burner on top of the exchanger.

040412 - 7600585-01

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. The heat released during this condensation process (the latent heat or condensing heat) is also transferred to the heating water. The cooled combustion gases are evacuated via the combustion gas outlet flue. The condensation water is evacuated via a siphon.

3.3.3. Heating and domestic hot water production

On heating and domestic hot water production type boilers, an integrated plate exchanger heats the domestic water. A 3-way valve determines whether the heated water is fed into the heating system or the plate exchanger. A pick-up sensor signals that a hot water tap is being opened. This signal is transmitted to the control panel, which then switches the 3-way valve to the hot water position and trips the heating pump. The 3-way valve is spring-loaded but only consumes electricity when it switches to another position.

The heating water reheats the domestic water in the plate exchanger. In comfort mode, if there is no hot water draw-off, the boiler handles the periodic reheating of the plate exchanger. Any limescale particles are kept out of the plate exchanger by a selfcleaning water filter (self-cleans once every 76 hours).

3.3.4. Control system

The boiler command, called Comfort Master©, handles a reliable heat supply. This means that the boiler treats external negative influences in a practical manner (notably when the water-flow is insufficient or there are problems with air supply). In the presence of such influences, the boiler doesn't switch into locking mode, but first reduces his power and, depending on the nature of the circumstances, will be temporarily out of service (blocking or stop). The boiler will continue to supply heat as long as the situation does not become dangerous.

3.3.5. Adjustment

The power of the boiler can be adjusted in the following ways:

4 On/Off setting

The output between the minimum and maximum values varies based on the heating flow set point temperature.

4 Adjustable control

The output between the minimum and maximum values varies based on the heating flow temperature determined by the modulating control system.

4 Analogue setting (0-10 V)

040412 - 7600585-01

T003757-A

1 2 3

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.

3.3.6. Regulation of the water temperature

The boiler is fitted with an electronic temperature regulator having an outlet and return temperature probe. The flow temperature can be set between 20°C and 90°C. The boiler reduces its power when the set outlet-temperature is attained. The cutout temperature is the set heating outlet-temperature + 5 °C.

3.3.7. Protection against a shortage of water

The boiler is fitted with a safety device to prevent the shortage of water based on temperature measurements. By reducing its output when the water flow rate is in danger of becoming insufficient, the boiler continues to operate as long as possible. If the flow rate is too weak ΔT ≥ 50°C or the heating flow temperature increases too much, the boiler is locked for 10 minutes, code 5t[09. When there is no water in the boiler or the pump is not running, the boiler goes into safety shutdown, code e[10 at ΔT ≥ 70°C.

3.3.8. Maximum temperature protection

The overheating safety device locks the boiler when the water temperature is too high (110°C), code e[12.

¼ For more detailed information, see chapter: "Error codes", page 85

040412 - 7600585-01

R000124-A

2 3

T001874-A

4 5 6 7

T002537-B

0 200 400 600 800 1000 1200

Q (l/h)

10 kW

15 kW

20 kW

25 kW

615

545

435

295

437 623 830 1037

100

200

300

400

500

700

H (mbar)

600

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)

Calenta 28c - 40c

Heat exchanger (Central heating)

Hydroblock

Plate heat exchanger (DHW)

Heating flow

Domestic hot water outlet

Domestic cold water inlet

Heating return

3-way valve

Shunt pump (Central heating)

3.3.10. Shunt pump

The boiler is equipped with a circulating pump. This energy-efficient, modulating circulating pump is controlled by the control unit based on ΔT. The graph shows the manometric height at various outputs.

Calenta 25s - 28c

Manometric height central heating circuit

Water flow

040412 - 7600585-01

T001748-B

0 250 500 750 1000 1250

100

200

300

400

500

700

800

H (mbar)

Q (l/h)

600

20 kW

25 kW

30 kW

35 kW

835 1252 1038

1465

606

418

530

291

T001978-A

100

200

300

400

500

600

700

0 500

1037437

15001000 2000 2500

∆p [mbar]

Q [l/h]

623 830

∆T = 20K

10 kW

15 kW

20 kW

25 kW

T001749-B

100

200

300

400

500

600

0 500

1043 1252 1465835

15001000 2000 2500

∆p [mbar]

Q [l/h]

∆T = 20K

20 kW

25 kW

30 kW

35 kW

Calenta 25s - 28c - 35s - 40c

3. Technical description

Calenta 35s - 40c

Manometric height central heating circuit

Water flow

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, vent the heating system).

4 If there is insufficient flow in the radiators or if they do not warm

up completely, the minimum pump speed can be increased using parameter p"8.

¼ See chapter: "Modification of the installer-level parameters", page 67.

3.3.11. Water flow rate

The boiler's modulating control system limits the maximum difference in temperature between the heating flow and return and the maximum speed at which the flow temperature increases. In this way, the boiler does not require a minimum water flow rate.

¼ If using thermostatic valves, see chapter: "Hydraulic connections", page 29.

Calenta 25s

3.4 Technical specifications

040412 - 7600585-01

Δp

Calenta 35s

Δp

Pressure drop

Water flow (max = 1680 l/h)

Pressure drop

Water flow (max = 2460 l/h)

3. Technical description Calenta 25s - 28c - 35s - 40c

Boiler type Calenta

25s 28c 35s 40c

General

EC indentification no. PIN

Flow rate setting Adjustable

Nominal output (Pn) Heating System (80/60 °C)

Nominal output (Pn) Heating System (50/30 °C)

Nominal output (Pn) DHW System

Nominal input (Qn) Heating System (Hi)

Nominal input(Qn) Heating System (Hs)

Nominal input (Qnw) DHW System (Hi)

Nominal input (Qnw) DHW System (Hs)

Heating efficiency under full load (Hi) (80/60 °C)

Heating efficiency under full load (Hi) (50/30 °C)

minimummaximum

Factory setting kW 24,1 19,4 34,0 23,3

minimummaximum

Factory setting kW 25,5 20,5 35,9 24,5

minimummaximum

Factory setting kW - 28,6 - 39,7

minimummaximum

Factory setting kW 25,0 20,1 35,1 24,0

minimummaximum

Factory setting kW 27,8 22,3 39,0 26,7

minimummaximum

Factory setting kW - 28,0 - 38,8

minimummaximum

Factory setting kW - 31,1 - 43,1

- % 96,3 96,3 96,9 96,9

- % 102,0 102,0 102,2 102,2

kW 5,0 - 24,1 5,0 - 24,1 6,3 - 34,0 6,3 - 34,0

kW 5,6 - 25,5 5,6 - 25,5 7,0 - 35,9 7,0 - 35,9

kW - 5,0 - 28,6 - 6,3 - 39,7

kW 5,2 - 25,0 5,2 - 25,0 6,5 - 35,1 6,5 - 35,1

kW 5,8 - 27,8 5,8 - 27,8 7,2 - 39,0 7,2 - 39,0

kW - 5,2 - 28,0 - 6,5 - 38,8

kW - 5,8 - 31,1 - 7,2 - 43,1

Modulating, Start/Stop, 0 - 10 V

0063BT3444

Heating efficiency under partial load (Hi) (Return

- % 96,1 96,1 96,3 96,3

temperature 60°C)

Heating efficiency under partial load (EN 92/42)

- % 108,0 108,0 108,2 108,2

(Return temperature 30°C)

Data on the gases and combustion gases

Gas categories

Gas inlet pressure G20 (GasH)minimum-

- I

2L3P

and I

mbar 17 - 30

maximum

Gas inlet pressure G25 (GasL)minimum-

mbar 20 - 30

maximum

Gas inlet pressure G31 (Propane)

Gas consumption G20 (GasH)minimum-

minimummaximum

mbar 30 - 50

m3/h

0,55 - 2,65 0,55 - 2,96 0,69 - 3,71 0,69 - 4,11

maximum

Gas consumption G25 (GasL)minimum-

m3/h

0,64 - 3,08 0,64 - 3,45 0,80 - 4,32 0,80 - 4,78

maximum

Gas consumption G31 (Propane)

NOx-Emission per year (n =1)

Mass flue gas flow rate minimum-

minimummaximum

m3/h

mg/kWh 38 38

0,21 - 1,02 0,21 - 1,15 0,27 - 1,44 0,27 - 1,59

42 42

kg/h 8,9 - 42,1 8,9 - 47,1 11,1 - 57,3 11,1 - 63,9

maximum

(1) Time needed as of the start of water draw-off to obtain an increase in temperature of 40K at the appliance's water outlet for the purposes of installation calculation, based on the draw-off flow rate CW. (2) The specific length of the pipe Ø 10/12 mm is the maximum uninsulated length, on the understanding that, in the most unfavourable summer situation, the appliance will supply hot water in less than 30 s with a permanent increase in temperature of 35 ºC at the draw-off point in the kitchen. (3) Front panel removed

040412 - 7600585-01

Calenta 25s - 28c - 35s - 40c 3. Technical description

Boiler type Calenta

Flue gas temperature minimum-

maximum

Maximum counter pressure

Characteristics of the heating circuit

Water content

Water operating pressure minimum bar 0,8

Water operating pressure (PMS)

Water temperature maximum °C 110

Operating temperature maximum °C 90

Manometric height central heating circuit (ΔT = 20K)

Characteristics of the domestic hot water circuit

CW gas approval

Specific hot water flow D (60 °C)

Specific hot water flow D (40 °C)

Domestic water resistance

Flow rate threshold minimum l/min - 1,2 - 1,2

Actual appliance waiting

(1)

time

Specific pipe length

Annual operational efficiency for domestic water

Water content

Operating pressure (Pmw) maximum bar - 8 - 8

Electrical characteristics

Power supply voltage

Power consumption - Full load

Power consumption - Part load

Power consumption Standby

Electrical protection index

Other characteristics

Weight (empty)

Acoustic level at 1 metre

(2)

maximum bar 3,0

without iSense % - 90,6 - 92,3

with iSense % - 91,4 - 93,8

maximum W 116 124 129 139

Factory setting W 72 72 92 92

maximum W 21 21 22 22

maximum W 4

Total kg 30 31 32 33

Mounting

(3)

°C 30 - 80 30 - 85 30 - 75 30 - 80

Pa 120 130 140 160

l 1,7 1,7 2,3 2,3

mbar 295 295 291 291

- - 4 - 5

l/min - 8,2 - 11,1

l/min - 13,7 - 19,5

mbar - 490 - 810

s - 5,15 - 5,18

m - 23,86 - 23,83

l - 0,33 - 0,49

VAC 230

IP X4D

kg 27 28 29 30

dB(A) 42 44 45 47

25s 28c 35s 40c

040412 - 7600585-01

4. Installation

4 Installation

4.1 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:

4 This instruction manual and any other applicable documentation

4 NEN 1006: The general provisions for drinking water installations

(AVWI)

4 NEN 1010: The provisions on safety for low voltage installations

4 NEN 1078: Gas device with an operating pressure of up to 500

mbar - performance requirements - new construction

4 NPR 3378: Guide on NEN 1078

4 NEN 1087: Ventilation of residential buildings

4 NPR 1088: Explanatory instructions on NEN 1087

4 NEN 2078: Requirements applicable to industrial gas installations

4 NEN 2757: Combustive air supply and flue gas discharge for

combustion appliances

4 NEN 3028: Requirements applicable to incineration installations

4 NEN 3215: Drainage systems inside residences and residential

buildings

4 NEN 8078: Gas device with operating pressure of up to 500 mbar

- performance requirements - existing construction

4 Building Regulations

4 Local provisions from the fire brigade, public service companies

and the municipality

4 In the event of application of domestic hot water supply equipment.

Work data sheet Drinking water installations, VEWIN nr. 4.4 B

Calenta 25s - 28c - 35s - 40c

4.2 Package list

4.2.1. Standard delivery

The delivery includes:

4 The boiler, fitted with an earthed mains plug

4 Mounting rail and mounting accessories for wall mounting

4 Mounting template

4 Connection kit comprising sleeves and clamping rings

040412 - 7600585-01

Calenta 25s - 28c - 35s - 40c 4. Installation

4 Run-off collector for siphon and safety valve

4 Installation and Service Manual

4 Sticker: This boiler has been set for...

4 User Guide

4 Warranty card

4 Maintenance log

These installation and maintenance instructions deal only with the items included in a standard delivery. For the installation or mounting of any accessories supplied with the boiler, a rail or mounting frame, for example, refer to the mounting instructions delivered with the accessories in question.

The boiler is also available with a modular adjustment device, such as the Combi Comfort system. In this case, the iSense adjustment device is delivered with the appliance.

4.2.2. Accessories

Various options are available depending on the configuration of the installation:

Description

Mounting frame

Mounting frame connection kit, comprising stop valves, safety unit and pressure gauge

Supporting device for feeding pipes behind the appliance

Pipe kit for connections behind the appliance (in combination with the supporting device)

Protective cover for the connections

Propane conversion kit

Remeha Celcia 10 on/off thermostat

Remeha qSense basic modulating control system

Remeha iSense extended modulating control system

Remeha iSense integration kit

Outside temperature sensor

Passing through walls Type C1

Combustion air/flue gas adapter 80/125 mm

Combustion air/flue gas adapter 60/100 mm

Kit for connection to the water heater

DHW sensor

Kit for connection to the solar water heater

0-10V (IF-01) control PCB

Extended control PCB (SCU-S02)

Box for the control PCBs

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

T001539-B

T001531-A

450

min.1000

395

min. 250

690

4. Installation Calenta 25s - 28c - 35s - 40c

4.3 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.

4.3.2. Location of the boiler

4 Before mounting the boiler, decide on the ideal position for

mounting, bearing the Directives and the dimensions of the appliance in mind.

4 When choosing the position for mounting the boiler, bear in mind

the authorised position of the combustion gas discharge outlets and the air intake opening.

4 To ensure adequate accessibility to the appliance and facilitate

maintenance, leave enough space around the boiler.

WARNING

4 Fix the appliance to a solid wall capable of bearing

the weight of the appliance when full of water and fully equipped.

4 It is forbidden to store inflammable products and

materials in the boiler room or close to the boiler, even temporarily.

CAUTION

4 The boiler must be installed in a frost-free

environment.

4 An earthed wall socket must be available close to the

boiler.

4 A connection to the mains drainage system for the

discharge of condensate must be available close to the boiler.

040412 - 7600585-01

T000756-A

1 0

2 3

225

240

T001532-A

min. 550

min.495

min. 250

50 (2)

min. 250

100 min. (1)

Calenta 25s - 28c - 35s - 40c 4. Installation

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.

4 In this case, connect the 230V power supply as a fixed connection.

4 Also in this case, connect an air intake pipe.

CAUTION

In the case of a fixed connection to the power cord, you must always install a main bipolar switch with an opening gap of at least 3 mm (EN 60335-1).

4.3.3. Ventilation

(1)

(2)

Distance between the front of the boiler and the internal wall of the casing box.

Distance to allow on either side of the boiler.

If the boiler is installed in a closed casing, respect the minimum dimensions given in the diagram opposite. Also allow openings to obviate the following hazards:

4 Accumulation of gas

4 Heating of the box

Minimum cross section of the openings: S1 + S2 = 150 cm

040412 - 7600585-01

T000754-C

195

265

132

199

266

331

690

450

395

225

120

140

150

257,5

195

265

132

199

266

331

690

450

395

225

120

140

150

257,5

4. Installation Calenta 25s - 28c - 35s - 40c

4.3.4. Main dimensions

i h

j z x

Gas / Gaz

Connection of the combustion gas exhaust pipe; Ø 80 mm

Connection of the air intake pipe; Ø 80 mm

Safety valve outlet pipe; Ø 25 mm

Condensates discharge; Ø 25 mm

Heating circuit return; Clamping Ø 22 mm

Domestic cold water inlet; Clamping Ø 15 mm

Gas connection; Clamping Ø 15 mm

y {

Domestic hot water outlet; Clamping Ø 15 mm

Heating circuit flow; Clamping Ø 22 mm

040412 - 7600585-01

T001540-A

Calenta 25s - 28c - 35s - 40c 4. Installation

4.4 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.

1. Position the mounting template to the wall with adhesive tape.

CAUTION

4 Using a spirit level, check that the mounting axis is

perfectly horizontal.

4 During mounting, cover up the connection points for

the air supply and the combustion gas exhaust, to protect the boiler and its connections from dust. Only remove this protection at the time when these connections are made.

2. Drill 2 holes with a Ø of 10 mm.

Additional holes are provided in case one or other of the standard locating holes prevents the correct location of the plugs.

3. Insert the rawplugs with a Ø of 10 mm.

4. Attach the mounting bracket to the wall with the provided bolts with a Ø of 10 mm.

5. Hang the boiler on the mounting bracket.

The relevant assembly instruction describes how to hang the mounting frame (accessory).

040412 - 7600585-01

T001535-C

T001534-C

4. Installation Calenta 25s - 28c - 35s - 40c

4.5 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.

If using plastic ducting (for the underfloor heating for example), the plastic tubes must be totally oxygen-tight according to standard DIN 4726/4729. If the synthetic ducting used in the installation does not conform to these standards, it is advisable to hydraulically separate the boiler circuit from the central heating circuit by installing a plate heat exchanger.

Parameters p"8 and p"9 are used to modify the pump settings.

4.5.2. Connection of a solar hot water tank

Boilers, of the heating and domestic hot water production type, are

Boiler

Tank

Solar collector

Pump

Flow limiter

Safety unit

Mixer valve

Solar DHW sensor SCU-S02

suitable for reheating downstream from solar DHW tanks. A kit (accessory) is available for the connection.

See the solar domestic hot water tank's technical notes for more information concerning hydraulic connections.

040412 - 7600585-01

T004865-A

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. This gives priority to the hot water tank when simultaneous requests for heat come from the hot water tank and the central heating. The indirectly heated calorifier can be connected using an internal or external three-way valve.

Internal 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

The boiler connection kit must be used to install the three-way valve in the boiler (Accessory). The three-way valve (230 V) is controlled by the boiler control unit of the boiler.

¼ For the installation or mounting of any accessories, refer to the mounting instructions delivered with the accessories in question.

A safety unit is installed at the point where cold water arrives at the hot water tank to prevent backflow or overpressure.

4 The central heating pipes for the boiler circuit must be

in Ø 22 mm (From Ø 15 mm to Ø 22 mm at the boiler itself).

040412 - 7600585-01

T001537-C

T001536-B

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). The three-way valve 24 V/230 V is controlled by control SCU-X02. The control must be installed in the electronics expansion kit (Accessory).

¼ For the installation or mounting of any accessories, refer to the mounting instructions delivered with the accessories in question.

4 In order to prevent an uncontrolled flow in the heating

circuit, the return channel to the hot water tank must always be connected directly to the return channel to the boiler and therefore never directly connected to the heating installation.

4 A safety unit is installed at the point where cold water

arrives at the hot water tank to prevent backflow or overpressure.

4.5.4. Geyser use

The combi boiler can also be used solely for DHW operation. The boiler can then function as a geyser. The central heating function has to be switched off for this purpose, using parameter p3.

Boiler

Filling/drainage valve

Expansion vessel

The flow and return connections of the unit have to be connected.

040412 - 7600585-01

T001958-A

Calenta 25s - 28c - 35s - 40c 4. Installation

4.5.5. Solo use

4.6 Hydraulic connections

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.

The sanitary pipes do not have to be connected or capped off. The dust caps supplied are sufficient.

4.6.1. Flushing the system

Installing the boiler in new installations (installations less than 6 months old)

4 Clean the installation with a universal cleaner to eliminate debris

from the appliance (copper, hemp, flux).

4 Thoroughly flush the installation until the water runs clear and

shows no impurities.

Installing the boiler in existing installations

4 Remove sludge from the installation.

4 Flush the installation.

4 Clean the installation with a universal cleaner to eliminate debris

from the appliance (copper, hemp, flux).

4 Thoroughly flush the installation until the water runs clear and

shows no impurities.

040412 - 7600585-01

T001573-C

T001570-B

T001633-B

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.

3. Install a filling and drainage valve on the installation for filling and draining the boiler.

4. Remove the anti-dust plug located on the heating return connection z under the boiler.

5. Connect the heating water return pipe to the heating return connection.

4 The boiler is factory fitted with a safety valve mounted

on the left hydroblock.

4 To facilitate maintenance work, we recommend

mounting a shut off valve on the heating flow and return pipes.

CAUTION

4 The heating pipe must be mounted in accordance

with prevailing provisions.

4 If installing shut off valves, position the filling/

drainage valve and the expansion vessel between the shut off valves and the boiler.

¼ If using thermostatic valves, see chapter: "Connecting the expansion vessel", page 31

040412 - 7600585-01

T001572-B

T001571-C

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.

3. Connect the cold water inlet pipe to the domestic cold water connection. Install a safety unit labelled KIWA on this pipe directly under the boiler.

4. Place a tube, connected to the drains, underneath the safety unit for water from expansion.

5. Connect the domestic hot water outlet pipe to the domestic hot water connection.

CAUTION

4 The domestic water pipes must be connected in

accordance with prevailing provisions.

4 If using synthetic pipes, follow the manufacturer's

(connection) instructions.

4.6.4. Connecting the expansion vessel

Install the expansion vessel on the heating return pipe z.

If using a heating and domestic hot water production type boiler on an installation in which the flow can be fully disconnected from the return (e.g. by using thermostatic valves), you should either fit a bypass or fit an expansion vessel to the heating flow conduit.

4.6.5. Connecting the condensate discharge pipe

1. Mount a standard drainage pipe, Ø 32 mm or more, leading to the mains drainage system.

2. Into this, insert the condensate collector hose coming from the siphon j and the safety valve ê.

3. Mount a trap or a siphon in the discharge pipe.

CAUTION

Do not make a fixed connection owing to maintenance work on the siphon.

040412 - 7600585-01

4 Do not plug the condensate discharge pipe.

4 Set the discharge pipe at a gradient of at least 30 mm

per metre, maximum horizontal length 5 metres.

4 Do not drain condensation water into a roof gutter at

any time.

4 Connect the condensate discharge pipe in

accordance with prevailing standards.

T001575-B

4. Installation Calenta 25s - 28c - 35s - 40c

4.7 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.

4. Connect the gas pipe to the gas shut off valve.

WARNING

4 Close the main gas valve before starting work on the

gas pipes.

4 Before mounting, check that the gas meter has

sufficient capacity. To do this, you should keep in mind the consumption of all domestic appliances.

4 If the gas meter has too low a capacity, inform the

energy supply company.

CAUTION

4 Ensure that there is no dust in the gas pipe. Blow into

the pipe or shake it before mounting.

4 We recommend installing a gas filter on the gas pipe

to prevent clogging of the gas valve unit.

4 Connect the gas pipe in accordance with prevailing

standards and regulations.

4.8 Connections for the air and exhaust pipes

¼ The boiler is suitable for the following types of flue gas connections. See chapter: "Certifications", page 7

4.8.1. Classification

The table specifies this classification in detail according to [.

Type

B23

B23P

B33 Open

C13 Closed

(1) Including the pressure classification P1 (2) EN483: 0,5 mbar suction by pressure reduction (3) An under pressure of 4 mbar is possible (4) See table for minimum sizes of duct or sleeving

Execution Description

Open

(1)

4 Without fire-stop approval.

4 Exhaust of combustion gases above the roof.

4 Air in the installation room. 4 Without fire-stop approval.

4 Common exhaust of combustion gases above the roof.

4 Common exhaust of combustion gases mixed in the air, air in the installation room (special

4 Vent in the outside wall.

4 The opening for the air-supply inlet is located in the same pressure zone as the vent (For

construction).

example, a common passage through the outside wall).

040412 - 7600585-01

Calenta 25s - 28c - 35s - 40c

Type Execution Description

C33 Closed

(2)

C43

C53 Closed

C63 Closed

C83

C93

(1) Including the pressure classification P1 (2) EN483: 0,5 mbar suction by pressure reduction (3) An under pressure of 4 mbar is possible (4) See table for minimum sizes of duct or sleeving

Closed/Cascade

(3)

Closed

(4)

Closed

4 Exhaust of combustion gases above the roof.

4 The opening for the air-supply inlet is located in the same pressure zone as the vent (For

example, a concentric passage to the roof).

4 Common channelling for the air-supply and exhaust of combustion gases (CLV):

- Concentric.

- Eccentric; Air supply from the shaft.

4 This also relates to the overpressure cascades. 4 Closed equipment.

4 Separate channelling for the air-supply.

4 Separate channelling for the combustion gases.

4 Terminating on different pressure surfaces. 4 The manufacturer delivers this type of equipment without a supply or exhaust system.

4 The equipment can be connected on a so-called semi-CLV system (with common combustion

gas exhaust).

4 Channel for the air-supply and exhaust fumes in a duct or surrounded by a sleeve:

- Concentric.

- Eccentric; Air supply from the shaft.

- Exhaust of combustion gases above the roof.

- The opening for the air-supply inlet is located in the same pressure zone as the vent.

4. Installation

Type Execution Diameter Minimum size of the duct or jacket.

Without air-supply With air-supply

∅ Channel  Channel ∅ Channel  Channel

C93 Rigid 60 mm 110 mm 110 x 110 mm 120 mm 110 x 110 mm

80 mm 130 mm 130 x 130 mm 140 mm 130 x 130 mm

100 mm 160 mm 160 x 160 mm 170 mm 160 x 160 mm

Flexible 60 mm 110 mm 110 x 110 mm 120 mm 110 x 110 mm

80 mm 130 mm 130 x 130 mm 145 mm 130 x 130 mm

100 mm 160 mm 160 x 160 mm 170 mm 160 x 160 mm

Concentric 60/100 mm 120 mm 120 x 120 mm 120 mm 120 x 120 mm

80/125 mm 145 mm 145 x 145 mm 145 mm 145 x 145 mm

100/150 mm 170 mm 170 x 170 mm 170 mm 170 x 170 mm

4.8.2. Outlets

in general, it is possible to use a standard kit for passage via the roof or outside wall. 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.

For exhausting combustion gases of types C1, C3 and C5, it is appropriate to use a M&G Skyline / Mugro 3000 or a Coxstand E HR. When exhausting combustion gases of type C6, the material of the exhaust must conform with Gastec QA and/or be provided with CE marking.

040412 - 7600585-01

The exhaust vent for combustion gases must conform to EN 1856-1. The flue gas pipes must be calculated conforming to EN 13384 (parts 1 & 2).

T000765-B

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

4 To define the maximum final length, you must deduct

the pipe length in accordance with the reduction table.

4 The boiler is also suitable for longer chimney lengths

with diameters other than those indicated in the table. Please contact us for further information.

Open flue (B23, B23P, B33)

If using an open flue version, the air supply opening remains open; only the combustion gas opening is connected. The boiler then takes in the combustion air required directly from the premises in which it is installed. For the application of air discharge and combustion gas discharge piping with a diameter other than 80 mm, a reducer should be used.

CAUTION

4 The air supply opening must remain open.

4 The premises in which the appliance is installed must

be fitted with the necessary air supply openings. They must not be reduced or closed.

Chimney length for the open flue version

Situation Diameter

60 mm 19 m 16 m 11 m 10 m

Free vent in zone I

Restricted vent in zone III Countryside (ΔP static = + 25 Pa)

Restricted vent in zone III Near the coast (ΔP static = + 40 Pa)

70 mm 35 m 30 m 21 m 19 m

80 mm 40 m 40 m 40 m 40 m

90 mm 40 m 40 m 40 m 40 m

60 mm 15 m 13 m 9 m 9 m

70 mm 28 m 24 m 17 m 16 m

80 mm 40 m 40 m 40 m 39 m

90 mm 40 m 40 m 40 m 40 m

60 mm 12 m 11 m 8 m 8 m

70 mm 23 m 21 m 14 m 14 m

80 mm 40 m 40 m 35 m 35 m

90 mm 40 m 40 m 40 m 40 m

Calenta

25s

Maximum length (L)

Calenta

28c

Calenta

35s

Calenta

40c

040412 - 7600585-01

T000766-B

T000780-C

Calenta 25s - 28c - 35s - 40c 4. Installation

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.

Chimney length for room sealed operation

Maximum length (L)

Situation Diameter

Free vent in zone I or Restricted vent in zone III

60-60 mm 7 m 5 m - -

70-70 mm 18 m 15 m 9 m 8 m

80-80 mm 20 m 20 m 20 m 19 m

90-90 mm 20 m 20 m 20 m 20 m

Calenta

25s

Calenta

28c

Calenta

35s

Calenta

40c

Connection in areas of different pressure (C53, C83)

Combustion air supply and combustion gas discharge are possible in various pressure zones, semi-CLV systems. With the exception of coastal areas. The maximum permissible difference in height between the combustion air supply and the combustion gas discharge is 36 m.

Chimney length in the various pressure zones

Maximum length (L)

Situation Diameter

70 mm 13 m 13 m 5 m 5 m

Free vent in zone I

Reduction table

Pipe reductions per element used

Diameter

60 mm 0,9 m 3,1 m

70 mm 1,1 m 3,5 m

80 mm 1,2 m 4,0 m

90 mm 1,3 m 4,5 m

100 mm 1,4 m 4,9 m

80 mm 36 m 36 m 24 m 23 m

90 mm 36 m 36 m 36 m 36 m

100 mm 30 m 36 m 36 m 36 m

Elbow 45° Elbow 90°

Pipe reduction Pipe reduction

Calenta

25s

Calenta

28c

Calenta

35s

Calenta

40c

040412 - 7600585-01

4. Installation

Calenta 25s - 28c - 35s - 40c

4.8.4. Specific air/flue gas applications

If the boiler has been modified, for example:

4 high pressure systems

4 WTW coupling

4 CLV overpressure (combusted gas discharge

systems)

It is necessary to mention on the sticker provided: This

boiler has been set for.... This sticker must be affixed to the

top of the boiler next to the identification plate. 4 Please contact us for further information.

high pressure systems

Flue gas discharge hoses with smaller diameters are available commercially for use with the boiler, these hoses are specifically for renovations where the existing flue gas discharge duct is not suitable for condensing flue gases.. Some boiler settings must be changed for this application of the boiler.

This is described in detail in the flue gas discharge systems practical manual Calenta.

WTW coupling

The boiler has been prepared for use in conjunction with a Itho HRU heat exchanger unit. Some boiler settings must be changed for

this application of the boiler. Full details are provided with the special connection kit (accessory component).

Always use the heat exchanger connection kit when using the heat exchanger coupling.

CLV overpressure (combusted gas discharge systems)

Under certain conditions, the boiler can be used in a CLV overpressure system. Some boiler settings must be changed for this application of the boiler. The setting can be modified using parameters p19 and p"0.

¼ See chapter: "Changing the settings", page 64

4.8.5. Additional Directives

4 Please refer to the manufacturer's instructions for the material in

question when installing the flue gas discharge and air supply materials. If the flue gas discharge and air supply materials are not installed according to the instructions (e.g. they are not leakproof, not clamped in place etc.), this may cause hazardous situations and/or result in bodily injury. After assembly, check at least all flue gas and air–carrying parts for tightness.

040412 - 7600585-01

T001972-A

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. Flexible supply flue pipes made from plastic or stainless steel are also permissible. Aluminium is permissible only if there is no contact between the building supply section and the combustion gas exhaust pipe.

4 Always clean the ducts thoroughly in cases where lining pipes are

used and/or a connection of the air-supply. It must be possible to inspect the flue or chimney.

4 In cases where condensate coming from the stainless steel or

plastic sections of the flue gas pipe can be driven back towards the aluminium section, this condensate must be removed using a collecting device before the aluminium section is reached (conforming with NPR 3378).

4 For long, aluminium, combustion-gas exhaust pipes it is initially

necessary to consider the relatively high quantity of corrosive products which are brought together with the condensate from the exhaust pipe. The siphon on the equipment requires regular cleaning or, preferably, an additional condensate collector can be installed above the equipment.

4 The combusted gas discharge pipe must be sufficiently inclined

towards the boiler (at least 50 mm per metre) and an adequate condensate collection tank and discharge system constructed (at least 1 m before the boiler opening). The elbows fitted must be at more than 90° to guarantee the provision of an adequate gradient and tightness on the lip rings.

Please contact us for further information.

4.8.6. Air/Exhaust adapter

The boiler is factory fitted with a two pipe connection. During installation, the room ventilated or room sealed version can be selected. Where needed, the outlet of the combustion gas / air supply can be turned through 180º. The air supply will then be located to the left of the combustion gas outlet and not to the right.

040412 - 7600585-01

T001512-A

80mm

T001513-A

80mm

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.

2. Fit together the combustion gas exhaust pipes, without welding.

4 The pipes must allow no leakage of flue gases and be

resistant to corrosion.

4 Connect the pipes together without stress between

the sections.

4 The horizontal sections need to be constructed with a

gradient of 50 mm per metre: Boiler orientation.

Material

Thick aluminium wall Approval according to EN-1856-1

Stainless steel Approval according to EN-1856-1

A rigid wall

Flexible

(1) The sealing must conform with pressure class 1

(1)

Synthetic material T120 Approval according to Gastec

QA or KOMO

Stainless steel Approval according to EN-1856-1

(1)

Synthetic material T120 Approval according to Gastec

QA or KOMO

4.8.8. Connection of the air intake pipe

Mounting

1. Fit the air-intake conduit.

2. Fit the air-intake conduits together without welding.

Material

A rigid wall

Flexible

Insertion depth 3 cm

The pipes must allow no leakage of flue gases and be

resistant to corrosion.

4 Connect the pipes together without stress between

the sections.

4 The horizontal sections need to be constructed with a

gradient: Downwards in the direction of the supply opening.

aluminium/Stainless steel/Synthetic material

040412 - 7600585-01

Calenta 25s - 28c - 35s - 40c

4.9 Electrical connections

4. Installation

4.9.1. Control unit

The boiler is not line- and neutral sensitive. The boiler is fully prewired. 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.

Power supply voltage 230 VAC/50Hz

Rating of the main fuse F1 (230 VAC) 6.3 AT

Fuse rating F2 (230 VAC) 2 AT

Fan-DC 27 VDC

CAUTION

The following boiler components are at a voltage of 230V:

4 Electrical connection of the heating pump (Central

heating) (if used).

4 Electrical connection of the combined gas valve unit.

4 Electrical connection of the 3-way valve (if used).

4 The majority of components in the control panel.

4 Ignition transformer.

4 Connection of the power supply cable.

The boiler is fitted with an earthed plug (cable length 1,5 m) suitable for a 230VAC/50Hz power supply with live/neutral/earth system. The power supply cable is connected to the X1 connector. A spare fuse can be found in the housing of the control system.

CAUTION

4 When the power supply cable has to be replaced, it

must be ordered from Remeha.

4 The boiler plug must be accessible at all times.

It is possible to connect various control, safety and regulation systems to the boiler. The standard control PCB (PCU) can be extended with the following, for example:

4 The 0-10V control PCB (accessory IF-01). For installation behind

the left hand cover on the control panel.

4 The extended control PCB (accessory SCU-S02). For installation

in a box (accessory).

¼ For the optional PCBs, see chapter: "Optional electrical connections", page 46

040412 - 7600585-01

4. Installation Calenta 25s - 28c - 35s - 40c

4.9.2. Recommendations

WARNING

4 Only qualified professionnals may carry out electrical

connections, always with the power off.

4 The boiler is entirely pre-wired. Do not modify the

connections inside the control panel.

4 Earth the appliance before making any electrical

connections.

Make the electrical connections of the boiler according to:

4 The instructions of the prevailing standards.

4 The instructions on the electrical diagrams provided with the

boiler.

4 The recommendations in the instructions.

CAUTION

Separate the sensor cables from the 230 V cables.

040412 - 7600585-01

R000073-A

On/

off

Tout

X13

X12

3 3

90º

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.

Access to the connector block:

1. Unscrew the two screws located under the front panel by a quarter turn and remove the panel.

2. Thread the cables from the regulator or thermostat through the right-hand grommet(s) on the lower plate of the boiler.

3. Tilt the control box forwards by opening the holding clips located at the sides.

4. Open the tooling box by opening the clip fastener on the front side.

5. Run the connection cable(s) through the grommet(s) in the control unit box.

6. Unscrew the necessary cable clamps (to access the connector block) and introduce the cables.

7. Connect the cables to the appropriate terminals on the connector block.

8. Firmly retighten the cable clamps and close the control panel.

040412 - 7600585-01

T000776-D

On/off

OT BL RL Tou t Tdhw

On/off

Tou

Tdhw

T001590-B

On/off

Tou

Tdhw

On/off

OT BL RL Tou t Tdhw

4. Installation Calenta 25s - 28c - 35s - 40c

4.9.4. Connecting the room thermostat

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. The boiler is also suitable for OpenTherm Smart Power.

4 Install the regulator in the reference room (generally the living

room).

4 Connect the two-wire cable to terminals On/off-OT of the

connector.

If the tap water temperature can be set on the OpenTherm controller, then the boiler supplies this temperature, with the set value on the boiler as the maximum.

Connect on/off thermostat

ON/OFF room thermostat

The boiler is suitable for connection to a 2 wire on/off room thermostat.

4 Install the regulator in the reference room (generally the living

room).

4 Connect the 2 wire 24V room thermostat to the On/off-OT

terminals of the connector.

4 Connect the power stealing thermostat to the On/off-OT terminals

of the connector.

If a room thermostat with an anticipation element is used, this must be converted using parameter p5.

040412 - 7600585-01

T001591-B

On/off

Tout

Tdhw

On/off

OT BL RL Tou t Tdhw

R000038-A

0 10 20

-20

-10

T000778-C

On/off

OT RLBL Tou t Tdhw

Tk Tv

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.

A OpenTherm controller can also use this outside sensor. The heating curve required must then be set on the controller.

Heating curve setting

If an outside temperature sensor is connected, it is possible to adapt the heating curve. The setting can be modified using parameters p1, p"5, p"6 and p"7.

040412 - 7600585-01

4.9.6. Connect frost protection

Frost protection in combination with on/off thermostat

If an on/off thermostat is used, it is advisable to protect any rooms where there is risk of frost by using a frost thermostat. The radiator valve in a room where there is a risk of frost must, however, be open.

4 In rooms where there is a risk of frost, a frost thermostat (Tv)

should preferably be installed.

4 Connect the frost thermostat in parallel with an on/off room

thermostat (Tk) to the On/off-OT terminals of the connector.

When using a OpenTherm thermostat, a frost thermostat cannot be connected in parallel to the On/off-OT terminals. Implement frost protection for the central heating system in combination with an external sensor.

T000443-B

On/off

Tou

Tdhw

On/off

OT BL RL Tou t Tdhw

4. Installation Calenta 25s - 28c - 35s - 40c

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. Connect the outside sensor to the Tout terminals of the connector.

The frost protection functions as follows where an outside sensor is used:

4 At an outside temperature lower than -10°C (can be set with

parameter p30): the circulation pump switches on.

4 At an outside temperature higher than -10°C (can be set with

parameter p30): the circulation pump continues to run and then switches off.

4.9.7. Connecting the calorifier sensor/

thermostat

DHW sensor

Connect the calorifier sensor or thermostat to the Tdhw terminals of the connector.

040412 - 7600585-01

T000442-A

On/off

Tou

X13

T001917-B

On/off

OT RLBL Tou t Tdhw

T001917-B

On/off

OT RLBL Tou t Tdhw

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.

4.9.9. Shutdown input

The boiler has a shutdown input. This input is on the BL terminals of the connector.

CAUTION

Only suitable for potential-free contacts.

Remove the bridge before using the input

The behaviour of the input can be changed using parameter p36.

¼ See chapter: "Parameter descriptions", page 64

4.9.10. Release input

The boiler has a release input. This input is on the RL terminals of the connector.

CAUTION

Only suitable for potential-free contacts.

040412 - 7600585-01

The behaviour of the input can be changed using parameter p37.

¼ See chapter: "Parameter descriptions", page 64

T000784-A

Status 0-10 0-10

Nc NoC

Nc No OTm 0 + 0 +C

OTm 0 + 0 +

IF-01

T000785-A

1 2

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.

CAUTION

Do not connect a frost thermostat or room thermostat to the boiler if using the 0-10 V control PCB.

Connection status (Nc)

If the boiler locks out, a relay is de-energised and the alarm can be transmitted via a potential-free contact (maximum 230 V, 1A) on terminals Nc and C of the connector.

Connection (OTm)

The interface communicates with the boiler control via OpenTherm. The OTm connection must be connected to the OpenTherm input

OT of the boiler control.

Analogue input (0-10 V)

This control can be based on temperature or heat output. The two controls are described briefly below. For analogue control, the 0-10 V signal must be connected to the interface.

Analogue temperature-based control (*)

The 0-10 V signal controls the boiler flow temperature between 0°C and 100°C. This control modulates on the basis of flow temperature, whereby the heat output varies between the minimum and maximum values on the basis of the flow temperature set point calculated by the controller.

A jumper (2) on the interface is used to select either temperature control (*) or heat output control (%).

Jumper 2

Input signal (V) Temperature ºC Description

0 - 1,5 0 - 15 Boiler off

1,5 - 1,8 15 - 18 Hysteresis

1,8 - 10 18 - 100 Temperature required

040412 - 7600585-01

T000800-A

1 2

1 1

T001255-B

Status

CNc No C

Nc No

Pump

N L

Pump

N L

EgV

N L

EgV

N L

3wV

SCU-SO2

X4 X5

N C

3wV

N C

Tsol Gps

Hru Hru

F 4AT

Calenta 25s - 28c - 35s - 40c 4. Installation

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.

Jumper 2 Input signal (V) Heat output (%) Description

(1)

0 - 2,0

2,0 - 2,2

2,0 - 10

(1) Dependent on the minimum modulation depth (set speeds, standard 20%)

Analogue output (0-10 V)

(1)

0 - 20 Boiler off

20 - 22 Hysteresis

20 - 100 Heat output requested

The temperature or heat output can be chosen for this feedback message. The two controls are described briefly below.

A jumper (1) on the interface is used to select either temperature control (*) or heat output control (%).

Jumper 1

Jumper 1 Output signal (V) Heat output (%) Description

(1) Dependent on the minimum modulation depth (set speeds, standard 20%)

Output signal (V)

Temperature À

Description

0,5 - Alarm

1 - 10 10 - 100 Delivered temperature

0 0 - 15 Boiler off

0,5 15 - 20 Alarm

2,0 - 10

(1)

20 - 100 Heat output supplied

4.10.2. Connection possibilities for the PCB (SCU-

S02)

When using the print PCB (SCU-S02), the housing for control PCBs will first have to be built in. Refer to the instructions supplied with the product. If the boiler is fitted with the control PCB (SCU-S02), then this is automatically recognised by the automatic control unit of the boiler.

040412 - 7600585-01

CAUTION

On removing this PCB, the boiler will show fault code e[38. To prevent this fault, an auto-detect must be carried out after removing this PCB.

¼ See chapter: "Carrying out an auto-detect", page

70.

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)

Control of external central heating pump (Pump)

An external central heating pump can be connected to the Pump terminals of the connector. The maximum input power is 400 VA.

Control of external three-way valve (3wV)

The external three-way valve (230 VAC) can be used when connecting an indirectly heated calorifier. The neutral position of the three-way valve can be set using parameter p34.

The three-way valve is connected as follows:

4 N = neutral

4 C = central heating

4 D = tank

Control of external sanitary hot water pump (3wV)

It is also possible to connect an external DHW pump to the terminals 3wV. Connect the pump as follows:

4 N = N pump

4 D = L pump

4 Q = PE pump

CAUTION

If the neutral position of the three-way valve is adjusted with parameter p34, the pump should be connected as follows:

4 N = N pump

4 C = L pump

4 Q = PE pump

Control of external gas valve (EgV)

If there is a heat demand, an alternating voltage of 230 VAC, 1 A (maximum) becomes available on the EgV terminals of the connector to control an external gas valve.

040412 - 7600585-01

Calenta 25s - 28c - 35s - 40c 4. Installation

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.

4 If the boiler locks out, the alarm can be transmitted via a potential-

free contact (maximum 230 VAC, 1 A) on the Nc and C terminals of the connector.

Solar DHW sensor Tsol

The solar boiler temperature is controlled using a sensor. Connect this sensor to the connector terminals Tsol.

Pressure switch minimum Gps

The minimum gas pressure switch shuts the boiler down if the inlet gas pressure becomes too low. Connect the minimum gas pressure switch to the Gps terminals of the connector. The presence of the gas pressure switch must be set using parameter p41.

Heat Recovery Unit (Hru)

Connect the wires from the heat recovery unit to the Hru terminals of the connector. The presence of the heat recovery unit must be set using parameter p4".

040412 - 7600585-01

T001047-G

2 31

X14

X13

X12

X10

X11

OT OS WS

HLS

1 2 7 8 9 103 4 5 6

1 2 3

GN/ YW

153

X21

1 2 3

GN/ YW

3 1 2

X41

SCUSCU

1 2 3 4 5 6

1 2 3

1 3 2

X121

2 3 4 1

GN/ YW

1 23

X22

PWM

PUMP

12 13

1 2

X116

FTSRTS

2 2

X115

X114

10 11

3 1

X112

2 3

1 3

X113

4 5 7 6

X111

1 2 3 4

PSU

2 3 4 5

X91

1 2 4 5

X117

230V, 50Hz

L N

SCU

1 32

GN/ YW

1 23

GN/YW

DIS

1 10

4 3 2 15

GN/ YW

3 1

4 2

X51

GB PUMP ADV

IT FAN

X13

X12

X11

X10

X14

4. Installation Calenta 25s - 28c - 35s - 40c

4.11 Electrical diagram

Power supply

SCU

Extended control PCB

On/Off switch

Ignition transformer

Ignition power relay

Combined venturi and gas valve unit

3-way valve

PSU

DIS

Storage parameter

Thermostat

Outside sensor

DHW sensor

Connecting a computer

Display

PUMP A

HLS

FAN

RTS

FTS

Shunt pump

Safety thermostat

Fan

Flow switch

Return sensor

Flow sensor

Pressure sensor

040412 - 7600585-01

T001523-B

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.

WARNING

Do not add chemical products to the central heating water without consulting Remeha. For example: antifreeze, water softeners, products to increase or reduce the pH value, chemical additives and/or inhibitors. These may cause faults in the boiler and damage the heat exchanger.

4 Rinse the central heating installation with at least 3x

the volume of the central heating installation. Flush the DHW pipes with at least 20 times the volume of the pipes.

4 For untreated water, the pH value of the water in the

installation must be between 7 and 9 and for treated water between 7 and 8,5.

4 The maximum hardness of the water in the installation

must be between 0,5 - 20,0 °dH (Depending on the total installed heat output).

4 For more information, refer to our publication water

quality rules. The rules in the aforementioned document must be respected.

4.12.2. Filling the siphon

1. Remove the siphon.

2. Fill the siphon with water. This must be filled up to the level markers.

3. Re-assemble the siphon.

CAUTION

4 Fill the water siphon before starting the boiler to avoid

combustion products escaping from the boiler.

4 Mount the vent hose above the siphon.

040412 - 7600585-01

T000181-B

T001574-B

T001507-B

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.

1. Fill the system with clean tap water (advised water pressure is between 1,5 and 2 bar).

2. Check the tightness of the water connections.

After switching on the power and if there is adequate water pressure, the boiler always runs through an automatic venting program lasting approximately 3 minutes (During filling, air can escape from the system via the automatic air vent). If the water pressure is lower than 0,8 bar, the symbol e will appear. If necessary, top up the water level in the heating system (recommended hydraulic pressure between 1,5 and 2 bar).

CAUTION

4 The filling must be carried out within 30 minutes,

otherwise the venting program starts and that would be undesirable if the device is not filled. Switch off the boiler if the central heating system is not being topped up immediately.

4 When venting, prevent water from getting into the

boiler casing and electrical parts of the boiler

040412 - 7600585-01

T001996-A

2 3 4 5 8

6 7

Calenta 25s - 28c - 35s - 40c 5. Commissioning

5 Commissioning

5.1 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 B [Chimney-sweeping] keys

(press the 2 and 3 keys simultaneously)

f [Menu] keys (press the 4 and 5 keys simultaneously)

a On/off switch

The display has several positions and symbols and provides information on the operating condition of the boiler and any possible failures. A service message may also appear in the display. Numbers, dots and/or letters may be displayed. The symbols located above the function keys indicate their current function.

4 The display content can be changed using parameter p6.

4 The brightness of the display lighting can be changed using

parameter p8.

Information menu: Reading the various current values.

Chimney-sweeping position:

Forced full or part load for CO2 measurement.

User menu:

Parameters at user level can be changed.

Heating programme deactivated:

The heating function is deactivated.

040412 - 7600585-01

Key lock-out is activated by setting parameter p6 to 3. If no key is pressed for 3 minutes, the display lighting switches off and only the current water pressure, the > key and the d symbol are displayed. Press the S key for about 2 seconds to reactivate the display and other keys. The d symbol disappears from the display.

5.1.2. Meaning of the symbols on the display

On/Off switch: After 5 lock-outs, the boiler must be switched off/on

again.

Shunt pump:

The pump operates.

Central heating function:

Access to central heating temperature parameter.

DHW function:

Access to sanitary hot water temperature parameter.

5. Commissioning

Calenta 25s - 28c - 35s - 40c

Manual mode:

Boiler is set to manual operation.

DHW programme deactivated:

The DHW mode is deactivated.

Service menu:

Parameters at installer level can be changed.

Energy-saving mode:

)

Economic mode activated.

Defect: Boiler indicates a fault. This can be seen from the e code

and red display.

Frost protection:

]

Boiler is running in frost protection mode.

Hour counter menu: Readout of the operating hours, number of successful

starts and hours on mains supply.

[

5.2 Check points before commissioning

5.2.1. Preparing the boiler for commissioning

Yellow display with the symbols: $ + K + Z (Maintenance message).

Water pressure: The water pressure is too low.

Battery symbol: Status of battery of wireless controller.

Signal strength symbol: Signal strength of the wireless controller.

Burner level: Boiler is running at full or low load.

Locking the keys: Key lock-out is activated.

WARNING

Do not put the boiler into operation if the supplied gas is not in accordance with the approved gas types.

Preparatory procedure for boiler commissioning:

4 Check that the gas type supplied matches the data shown on the

boiler's data plate.

4 Check the gas circuit.

4 Check the hydraulic circuit.

4 Check the water pressure in the heating system.

4 Check the electrical connections to the thermostat and the other

external controls.

4 Check the other connections.

4 Test the boiler at full load. Check the setting of the gas/air ratio

and, if necessary, correct it.

4 Test the boiler at part load. Check the setting of the gas/air ratio

and, if necessary, correct it.

4 Finalizing work.

040412 - 7600585-01

T001518-B

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.

3. Tilt the control box forwards by opening the holding clips located at the sides.

4. Check the gas supply pressure at the pressure outlet C on the gas valve unit.

WARNING

To ascertain the gas types permitted, see chapter:

"Equipment categories", page 9

5. Check the tightness of the gas connections made after the gas valve unit in the boiler.

6. Check the tightness of the gas line, including the gas valves. The test pressure must not exceed 60 mbar.

7. Purge the gas supply pipe within the boiler by unscrewing the pressure outlet on the gas block. Tighten the measurement point when the pipe has been sufficiently purged.

8. Check the tightness of the gas connections in the boiler.

5.3 Commissioning the boiler

5.2.3. Hydraulic circuit

4 Check the condensate discharge siphon; it must be filled with

clean water up to the mark.

4 Check that there are no leaks on the hydraulic connections.

5.2.4. Electrical connections

4 Check the electrical connections, particularly the earth.

4 Check the electrical connections to the thermostat and the other

external controls.

1. Tilt the control box upwards again and fasten it using the clips located at the sides.

2. Open the main gas supply.

3. Open the gas valve on the boiler.

4. Insert the boiler plug into an earthing socket.

5. Turn on the boiler using the on/off switch.

040412 - 7600585-01

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.

fK[xx pK[xx

: Software version

: Parameter version

The version numbers are displayed alternately.

8. A vent cycle of a duration of around 3 minutes is carried out automatically.

If a DHW sensor is connected and the anti-legionella function is activated, the boiler starts to heat the water in the DHW tank as soon as the vent programme has been completed.

By pressing the S key for a short time, the current operating status is shown on the display:

Heat demand 5D

1 : Fan ON 1 : Post-ventilation 1 : Fan ON 1 : Post-ventilation " : Boiler is igniting 5 : Burner stop " : Boiler is igniting 5 : Burner stop

3 : Heating System 0 : Standby 4 : Domestic hot water mode 0 : Standby

Heat demand stopped

6 : Post-circulation of the pump

Hot tap water demand N

Heat demand stopped

6 : Post-circulation of the pump

In addition to 0, in STAND-BY the display normally shows the water pressure and the symbols 5D, 5H and N.

Error during the start-up procedure:

4 No information is shown on the display:

- Check the mains supply voltage

- Check the main fuses

- Check the fuses on the control panel:

(F1 = 6,3 AT, F2 = 2 AT)

- Check the connection of the mains lead to the connector X1 in

the instrument box

4 A fault is indicated on the display by the fault symbol c and a

flashing fault code.

- The meaning of the error codes is given in the error table.

- Press for 3 seconds on key J to restart the boiler.

If the economy setting (eco setting) is on, then, after central heating operation, the boiler will not start to run for hot tap water production.

040412 - 7600585-01

T001526-A

Calenta 25s - 28c - 35s - 40c 5. Commissioning

5.4 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 L).

4 If the boiler is converted, for example, to:

- G20 (Gas H)

- G31 (Propane)

It is necessary to mention on the sticker provided: This

boiler has been set for.... This sticker must be affixed

to the top of the boiler next to the identification plate.

4 If operating on propane, Remeha cannot guarantee

compliance with all aspects of comfort in accordance with the CW label.

For operation on another group of gases, carry out the following operations:

4 Regulate the fan speed as indicated in the table (if required). The

setting can be modified using parameters p17, p18, p19 and p20:

¼ See chapter: "Parameter descriptions", page 64

4 Set the air/gas ratio. For more detailed information:

¼ See chapter: "Setting the air/gas ratio (Full load)", page 57

¼ See chapter: "Setting the air/gas ratio (Part load)", page 59

5.4.2. Setting the air/gas ratio (Full 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.

040412 - 7600585-01

T001586-A

rpm

kWµA

± 30l/min

barPsi

St ºC

ºCºFh

T000932-A

5. Commissioning Calenta 25s - 28c - 35s - 40c

3. Set the boiler to full load. Press the two B keys simultaneously. The display shows

. The symbol B appears.

4. Measure the percentage of O2 or CO2 in the flue gases (Front panel removed).

5. If this rate does not match the required value, correct the gas/air ratio using the adjustment screw A on the gas valve unit.

6. Check the flame through the flame inspection window.

The flame must not be detached.

O2/CO2 control and setting values at full load for G20 (Gas H)

Boiler type Setting value Checking value

O 2 (%) CO 2 (%) O 2 (%) CO 2 (%)

Calenta 25s 5,2 ± 0,4 8,8 ± 0,2 5,2 ± 0,5 8,8 ± 0,3

Calenta 28c 5,2 ± 0,4 8,8 ± 0,2 5,2 ± 0,5 8,8 ± 0,3

Calenta 35s 4,8 ± 0,4 9,0 ± 0,2 4,8 ± 0,5 9,0 ± 0,3

Calenta 40c 4,8 ± 0,4 9,0 ± 0,2 4,8 ± 0,5 9,0 ± 0,3

O2/CO2 control and setting values at full load for G25 (Gas L)

Boiler type Setting value Checking value

O 2 (%) CO 2 (%) O 2 (%) CO 2 (%)

Calenta 25s 5,0 ± 0,4 8,8 ± 0,2 5,0 ± 0,5 8,8 ± 0,3

Calenta 28c 5,0 ± 0,4 8,8 ± 0,2 5,0 ± 0,5 8,8 ± 0,3

Calenta 35s 4,5 ± 0,4 9,1 ± 0,2 4,5 ± 0,5 9,1 ± 0,3

Calenta 40c 4,5 ± 0,4 9,1 ± 0,2 4,5 ± 0,5 9,1 ± 0,3

Diameter of the gas diaphragm (x.xx) O2/CO2 control and setting values at full load for G31 (Propane)

Fit the gas restrictor in the gas block Boiler type Setting value Checking value

Ø mm O 2 (%) CO 2 (%) O 2 (%) CO 2 (%)

4,00 Calenta 25s 5,2 ± 0,3 10,3 ± 0,2 5,2 ± 0,5 10,3 ± 0,3

4,00 Calenta 28c 5,2 ± 0,3 10,3 ± 0,2 5,2 ± 0,5 10,3 ± 0,3

- Calenta 35s 5,2 ± 0,3 10,3 ± 0,2 5,2 ± 0,5 10,3 ± 0,3

- Calenta 40c 5,2 ± 0,3 10,3 ± 0,2 5,2 ± 0,5 10,3 ± 0,3

040412 - 7600585-01

T001526-A

T001587-A

rpm

kWµA

± 30l/min

barPsi

St ºC

ºCºFh

T000933-B

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.

3. Set the boiler to part load. Press the two B keys simultaneously. The symbol B appears. Press the [-] key several times until

4. Measure the percentage of O2 or CO2 in the flue gases (Front panel removed).

is displayed on the screen.

5. If this rate does not match the required value, correct the gas/air ratio using the adjustment screw B on the gas valve unit.

Turn the screw B anticlockwise to obtain a lower CO2 value.

4 Turn the screw B clockwise to obtain a higher CO

value.

6. Check the flame through the flame inspection window.

The flame must be stable and blue in colour with orange particles around the edge of the burner.

O2/CO2 control and setting values at part load for G20 (Gas H)

Boiler type Setting value Checking value

O 2 (%) CO 2 (%) O 2 (%) CO 2 (%)

Calenta 25s 5,9 ± 0,4 8,4 ± 0,2 5,9 ± 0,4 8,4 ± 0,2

Calenta 28c 5,9 ± 0,4 8,4 ± 0,2 5,9 ± 0,4 8,4 ± 0,2

Calenta 35s 5,5 ± 0,4 8,6 ± 0,2 5,5 ± 0,4 8,6 ± 0,2

Calenta 40c 5,5 ± 0,4 8,6 ± 0,2 5,5 ± 0,4 8,6 ± 0,2

O2/CO2 control and setting values at part load for G25 (Gas L)

Boiler type Setting value Checking value

O 2 (%) CO 2 (%) O 2 (%) CO 2 (%)

Calenta 25s 5,7 ± 0,4 8,4 ± 0,2 5,7 ± 0,4 8,4 ± 0,2

Calenta 28c 5,7 ± 0,4 8,4 ± 0,2 5,7 ± 0,4 8,4 ± 0,2

Calenta 35s 5,2 ± 0,4 8,7 ± 0,2 5,2 ± 0,4 8,7 ± 0,2

Calenta 40c 5,2 ± 0,4 8,7 ± 0,2 5,2 ± 0,4 8,7 ± 0,2

040412 - 7600585-01

T001985-B

9 10

T001522-A

5. Commissioning

Calenta 25s - 28c - 35s - 40c

O2/CO2 control and setting values at part load for G31 (Propane)

Boiler type Setting value Checking value

O 2 (%) CO 2 (%) O 2 (%) CO 2 (%)

Calenta 25s 5,8 ± 0,3 9,9 ± 0,2 5,8 ± 0,3 9,9 ± 0,2

Calenta 28c 5,8 ± 0,3 9,9 ± 0,2 5,8 ± 0,3 9,9 ± 0,2

Calenta 35s 5,8 ± 0,3 9,9 ± 0,2 5,8 ± 0,3 9,9 ± 0,2

Calenta 40c 5,8 ± 0,3 9,9 ± 0,2 5,8 ± 0,3 9,9 ± 0,2

Repeat the high speed test and the low speed test as often as necessary until the correct values are obtained without having to make additional adjustments.

5.4.4. Basic setting for the gas/air ratio

If the gas/air ratio is out of adjustment, the gas valve unit has a basic setting. To do this, proceed as follows:

1. Cut the power supply to the boiler.

2. Close the gas valve on the boiler.

3. Remove the air inlet flue on the venturi.

4. Unscrew the top connection on the gas valve unit.

5. Disconnect the connector located under the fan.

6. Release the 2 clips holding the fan/mixing elbow unit in place on the heat exchanger.

7. Completely remove the fan/mixing elbow unit.

For steps 3 to 7 inclusive, see chapter: "Checking the burner

and cleaning the heat exchanger", page 78

8. Turn the setting screw A on the gas valve unit to modify the position of the restrictor.

9. Turn the setting screw B on the gas valve unit anticlockwise until it matches the front panel.

10.Turn the setting screw B on the gas valve unit by 6 turns clockwise.

11.Follow the procedure in reverse to re-assemble all of the components.

5.5 Checks and adjustments after commissioning

5.5.1. Finalizing work

1. Remove the measuring equipment.

2. Put the flue gas sampling plug back in place.

3. Refit the front panel. Tighten the two screws by a quarter turn.

4. Push key

5. Raise the temperature in the heating system to approximately 70°C.

6. Shut down the boiler.

7. After about 10 minutes, vent the air in the heating system.

8. Switch on the boiler.

to return the boiler to normal operating mode.

040412 - 7600585-01

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).

11.Tick the gas category used on the data plate.

12.Complete the checklist in the supplied service book.

13.Explain the operation of the installation, the boiler and the regulator to the users.

14.Give all the instruction manuals to the user.

15.Together with the end user, fill in the warranty sheet provided.

16.Confirm the commissioning with a signature and a company stamp.

5.6 Reading out measured values

5.6.1. Reading the various current values

The following current values can be read off the information menu Q:

4 5t = State. 4 5v = Sub-status. 4 t1 = Supply temperature (°C). 4 t" = Return temperature (°C). 4 t3 = Calorifier temperature (°C). 4 t4 = Outside temperature (°C) (Only with an outside

temperature sensor).

4 t5 = Solar boiler temperature (°C). 4 5p = Internal set point (°C). 4 fl = Ionization current (µA). 4 Mf = Fan speed in rpm. 4 pr = Water pressure (bar). 4 p; = Supplied relative heat output (%).

040412 - 7600585-01

T000810-F

T000816-G

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.

is displayed, alternating with the

current status 3 (for example).

3. Press the [+] key.

sub-status

(for example).

4. Press the [+] key.

flow temperature

is displayed, alternating with the current

°C (for example).

5. Press the [+] key successively to scroll down the various parameters.

t", t3, t4, t5

6. Press the [+] key.

set point

°C (for example).

7. Press the [+] key.

ionization current

8. Press the [+] key.

fan rotation speed

9. Press the [+] key.

water pressure

is displayed, alternating with the internal

is displayed, alternating with the current

µA (for example).

is displayed, alternating with the current

3000

rpm (for example).

is displayed, alternating with the current

bar (for example). If no water pressure sensor

is connected, [-.-] appears on the display.

10.Press the [+] key.

modulation percentage

11.Press the [+] key. The readout cycle starts again with

12.Press the

key 2 times to return to the current operating

is displayed, alternating with the current

% (for example).

mode.

5.6.2. Readout from the hour counter and

percentage of successful starts

1. Press the two keys f simultaneously and then key [+] until the symbol \ flashes on the menu bar.

2. Press the S key.

operation

3600

3. Press the [+] key. The display shows D.

alternating with the number of operating hours in central heating operation

4. Press the [+] key. The display shows N.

560

alternating with the number of operating hours used for heating tap water

320

(for example).

5. Press the [+] key. The display shows @.

alternating with the percentage of successful starts

example).

6. Press the

key 2 times to return to the current operating

mode.

and the number of hours of boiler

(for example) are displayed alternately.

is displayed,

(for example).

is displayed,

% (for

040412 - 7600585-01

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 0 1

3 / 4 Burner for central heating operation / DHW System

9 17

Rest

Boiler start (Heat demand)

Burner start

Burner stop

Boiler stop (End of heat demand)

Control stop

Blocking

Bleed

Rest

Anti-hunting

Control three-way valve

Start pump

Wait for the correct temperatures for burner start

Open flue gas damper/external gas valve

Increase fan speed

Pre-ventilation

Wait for release signal

Burner on

Pre-ignition

Main ignition

Flame detection

Intermediate ventilation

Temperature control

Limited temperature control (ΔT safety)

Output control

Increase protection level 1 (Modulate down)

Increase protection level 2 (Part load)

Increase protection level 3 (Blockage)

Modulate up for flame control

Temperature stabilisation time

Cold start

Burner off

Post ventilation

Close flue gas damper/external gas valve

Recirculation protection

Stop fan

Pump post circulation

Pump off

Control three-way valve

Start anti-hunting

Wait for burner start

Anti-hunting

Shutdown code xx

Rest

Control three-way valve

Start pump

Pump off

Control three-way valve

040412 - 7600585-01

5. Commissioning Calenta 25s - 28c - 35s - 40c

5.7 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.

5.7.1. Parameter descriptions

Factory setting

Parameter

p17

p18

(1) Do not modify these factory settings unless absolutely necessary. For example, for modification of the boiler for: G20 (H gas) or G31 (propane), high pressure systems, WTW coupling or CLV overpressure

Description Adjustment range

Supply temperature: T

Domestic hot water temperature: T

SET

Heating / DHW mode

ECO mode

Anticipation resistance

Display screen

Post-circulation of the pump

Brightness of display lighting

Maximum fan speed (Heating)

Maximum fan speed (DHW)

SET

20 to 90 °C

40 to 65 °C

0 = Heating deactivated / DHW deactivated 1 = Heating activated / DHW activated 2 = Heating activated / DHW deactivated 3 = Heating deactivated / DHW activated

0 = Comfort 1 = Energy-saving mode 2 = Management using a programmable thermostat

0 = No anticipation resistance for the ON/OFF thermostat

1 = Anticipation resistance for the ON/OFF thermostat

0 = Simple 1 = Comprehensive 2 = Automatic switching to simple after 3 minutes 3 = Automatic switching to simple after 3 minutes; Key

blocking is active

1 to 98 minutes 99 minutes = continuous

0 = Dimmed 1 = Bright

G25 (Gas L) (x100 rpm)

G20 (Gas H) (x100 rpm)

G31 (Propane) (x100 rpm)

G25 (Gas L) (x100 rpm)

G20 (Gas H) (x100 rpm)

G31 (Propane) (x100 rpm)

(1)

Calenta

25s 28c 35s 40c

56 46 62 42

53 43 62 42

56 62 62 68

53 59 62 68

040412 - 7600585-01

Calenta 25s - 28c - 35s - 40c 5. Commissioning

Factory setting

Parameter Description Adjustment range

Calenta

25s 28c 35s 40c

(1)

18 18 17 17

18 18 18 17

p19

Minimum fan speed (Heating +DHW)

G25 (Gas L) (x100 rpm)

G20 (Gas H) (x100 rpm)

G31 (Propane) (x100 rpm)

CLV overpressure (combusted gas discharge systems)

21 21 23 23

(x100 rpm)

G25 (Gas L)

(1)

50 50 75 75

G20 (Gas H) 50 50 75 75

p20

p21

p22

p23

p24

p25

p26

p27

p28

Minimum fan speed (offset)

Start speed

G31 (Propane) 50 50 75 75

CLV overpressure (combusted gas discharge systems)

Do not modify (x100 rpm)

50 50 40 40

30 30 40 40

Minimum water pressure 0 - 3 bar(x 0,1 bar) 8

Maximum flow temperature of

0 to 90 °C

system

Anti-hunting differential for central

-15 to 15 °C

heating operation

Heat curve set point (Maximum outside temperature)

Heat curve set point (Supply temperature)

Heat curve set point (Minimum outside temperature)

Setting the pump speed

0 to 30 °C (Only with an outside temperature sensor)

0 to 90 °C (Only with an outside temperature sensor)

-30 to 0 °C (Only with an outside temperature sensor)

2 - 10 (x 10 % )

-15

(Minimum pump speed for central

heating operation)

p29

Setting the pump speed (Maximum pump speed for

2 - 10 (x 10 % )

central heating operation)

p30

Antifreeze temperature from - 30 to 0°C -10

0 = Stop 1 = Start

p31

Legionella protection

(After commissioning, the boiler will operate once a

1 0 1 0 week at 65°C for DHW) 2 = Management using a programmable thermostat

p32

p33

p34

p35

Set point increase for calorifier 0 to 20 °C 15

DHW cut-in temperature DHW sensor

Control of three-way valve

Boiler type

from 2 to 15°C 6

0 = Normal 1 = Reverse

0 = Heating and instant domestic hot water 1 = Heating only

1 0 1 0

0 = Heating activated

p36

Shutdown input function

1 = Shutdown without frost-protection 2 = Shutdown with frost protection

3 = Lock-out with frost protection (Pump only)

p37

Release function

0 = Hot water on 1 = Release input

040412 - 7600585-01

T001906-B

5. Commissioning

Parameter Description Adjustment range

p38 p39

p40

p41

p42

p43

p44 p45 p46

df and dV

Release waiting time 0 to 255 seconds 0

Gas valve switching time 0 to 255 seconds 0

Fault relay function (Optional)

GpS connected (Optional)

HRU connected (Optional)

Mains detection phase

Maintenance message Do not modify 1

Service operating hours Do not modify 175

Service burning hours Do not modify 30

Detection of connected SCUs

Factory setting

0 = Operation signal 1 = Alarm signal

0 = Not connected 1 = Connected

0 = Stop 1 = Start

0 = No detection 1 = Detection

To restore the factory settings or when replacing the main PCB, enter the values dF and dU from the type plate in parameters df and dV

Calenta 25s - 28c - 35s - 40c

Factory setting

Calenta

25s 28c 35s 40c

5.7.2. Modification of the user-level parameters

Parameters p1 to p8 can be modified by the user in order to meet central heating and DHW comfort needs.

CAUTION

Modification of the factory settings may be detrimental to the functioning of the appliance.

1. Press the two keys f simultaneously and then key [+] until the symbol W flashes on the menu bar.

2. Select the users menu using the key S.

flashing.

3. Press the S key a second time. The value

flashes (for example).

4. Change the value by pressing the [-] or [+] key. In this example using key [-] to

5. Confirm the value with the S key.

°C.

p[1

flashing.

6. Press the

key 2 times to return to the current operating

mode.

is displayed with

p[1

°C appears and

is displayed with

040412 - 7600585-01

T000819-E

Calenta 25s - 28c - 35s - 40c 5. Commissioning

4 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.

4 The parameters p1 (the maximum heating water

temperature) and p2 (the maximum drinking water temperature) can also be modified using the quick selection menu.

5.7.3. Modification of the installer-level

parameters

Parameters p17 to df must only be modified by a qualified professional. To prevent unwanted settings, some parameter settings can only be changed after the special access code 0012 is entered.

If the boiler has been modified, for example:

4 G20 (Gas H) or G31 (Propane)

4 high pressure systems

4 WTW coupling

4 CLV overpressure (combusted gas discharge

systems)

It is necessary to mention on the sticker provided: This

boiler has been set for.... This sticker must be affixed to the

top of the boiler next to the identification plate.

CAUTION

Modification of the factory settings may be detrimental to the functioning of the appliance.

1. Press the two keys f simultaneously and then key [+] until the symbol ? flashes on the menu bar.

Select the fitter menu using the  key.

c0de

appears on the

display.

3. Use keys [-] or [+] to input the installer code

4. Confirm using key S.

is displayed with 1 flashing.

p[1

5. Press the S key a second time. The value

0012

°C appears and

flashes (for example).

6. Change the value by pressing the [-] or [+] key. In this example using key [-] to

7. Confirm the value with the S key:

°C.

is displayed with

p[1

flashing.

8. If necessary, set other parameters by selecting them using the [-] or [+] keys.

9. Press the

key 2 times to return to the current operating

mode.

The boiler also returns to operating status if no keys are pressed for 3 minutes.

040412 - 7600585-01

T001848-B

1500

2000 2500 3000 3500 4000 4500

5600

5000 5500 6000

T001847-A

1500

2000 2500 3000 3500 4000 4500

4600 5600

5000 5500 6000

T001966-B

2000 3000 4000 5000 6000 7000

6200

T001967-B

2000 3000 4000 5000 6000 7000

6200

4200

5. Commissioning Calenta 25s - 28c - 35s - 40c

5.7.4. Setting the maximum heat input for central

heating operation

Calenta 25s

Calenta 28c

Calenta 35s

Maximum heat input

Factory setting

Power input (kW)

Fan rotation speed (rpm)

Maximum heat input

Factory setting

Power input (kW)

Fan rotation speed (rpm)

Maximum heat input

Factory setting

Power input (kW)

Calenta 40c

Fan rotation speed (rpm)

Maximum heat input

Factory setting

Power input (kW)

Fan rotation speed (rpm)

040412 - 7600585-01

T001628-A

...x

T000820-H

...x

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.

2. Select the installers menu using the key S.

c0de

appears

on the display.

3. Use keys [-] or [+] to input the installer code

4. Confirm using key S.

5. Press the [+] key to go to parameter

is displayed with 1 flashing.

p[1

p[17

0012

6. Confirm using key S.

7. Press the [+] key to increase the speed from

(see the graphs for the associated heat output).

to, for example,

8. Confirm the value with the S key.

9. Press the

key 2 times to return to the current operating

mode.

5.7.5. Return to the factory settings

1. Press the two keys f simultaneously and then key [+] until the symbol ? flashes on the menu bar.

2. Select the installers menu using the key S.

c0de

on the display.

3. Use keys [-] or [+] to input the installer code

4. Confirm using key S.

5. Press the [+] key several times.

is displayed with 1 flashing.

p[1

p[df

0012

is displayed with

flashing.

6. Press the S key.

df[x

is displayed with x flashing. This is

the current value of X for dF. Check this against the value of X on the type plate.

7. Enter the value of X shown on the type plate using the [-] or [+] key.

8. Confirm the value with the S key,

df[y

is displayed with

flashing. This is the current value of Y for dU. Check this against the value of Y on the type plate.

9. Enter the value of Y shown on the type plate using the [-] or [+] key.

10.Confirm the value with the S key. The factory settings are reset.

11.The display returns to the current operating mode.

appears

040412 - 7600585-01

T000445-B

...x

T000824-E

bar

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.

2. Select the installers menu using the key S.

c0de

appears

on the display.

3. Use keys [-] or [+] to input the installer code

4. Confirm using key S.

5. Press the [+] key several times.

is displayed with 1 flashing.

p[1

p[Zd

is displayed with

0012

flashing.

6. Confirm using key S. Auto-detect is carried out.

7. The display returns to the current operating mode.

5.7.7. Setting the manual mode

In some cases it may be necessary to switch the boiler to manual operation, For example, if the controller has not yet been connected. The boiler can be switched to automatic or manual operation under the symbol E. To do this, proceed as follows:

1. Press the two keys f simultaneously and then key [+] until the symbol E flashes on the menu bar.

2. Press the S key:

The text

with the current water pressure (only if an outside

sensor is connected). The flow temperature is determined by the internal heating curve.

The value of the minimum flow temperature.

3. Press the [-] or [+] key to increase this value temporarily in manual operation.

4. Confirm the value with the S key. The boiler is now set to manual operation.

5. Press the

key 2 times to return to the current operating

mode.

5.7.8. Setting the legionella protection function

The boiler is supplied with legionella protection as standard. The setting can be changed using the parameter p31.

¼ See chapter: "Parameter descriptions", page 64.

040412 - 7600585-01

Calenta 25s - 28c - 35s - 40c

6 Switching off the boiler

6.1 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.

4 Cut the power supply to the boiler.

4 Shut off the gas supply.

4 Ensure that the boiler and system are protected against frost

damage.

6.2 Frost protection

6. Switching off the boiler

CAUTION

If the home is unoccupied for a long period and there is a risk of frost, drain the boiler and the heating system.

4 Turn down the temperature of the room thermostat to, for example,

10 °C.

4 Set the boiler to ECO mode using parameter p4, this action will

switch off the standby setting.

¼ See chapter: "Changing the settings", page 64.

The boiler will then only start up to protect itself from frost. To prevent radiators and the system from freezing in rooms where there is a risk of frost (e.g. a garage or storage room), a frost thermostat or outside sensor can be connected to the boiler.

¼ See paragraph: "Connect frost protection", page 43.

CAUTION

4 The antifreeze protection does not function if the

boiler is switched off.

4 The integrated protection system only protects the

boiler, not the installation.

040412 - 7600585-01

When the heating water temperature in the boiler falls by too much, the integrated protection system in the boiler starts up. This protection functions as follows:

4 If the water temperature is lower than 7°C, the heating pump starts

up.

4 If the water temperature is lower than 4°C, the boiler starts up.

4 If the water temperature is higher than 10°C, the boiler shuts down

and the circulation pump continues to run for a short time.

T000836-E

...x

T000837-C

...x

6. Switching off the boiler Calenta 25s - 28c - 35s - 40c

6.3 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.

2. The symbol D and the current temperature are displayed (the temperature flashes, e.g.

3. Press the [-] key several times until

°C).

0ff

is displayed on the

screen.

4. To confirm, press the S key.

5. The symbol C appears on the display.

6.4 Shutting down domestic hot water production

The boiler drinking water mode can be deactivated via the "quick menu". To do this, proceed as follows:

1. Press the N key 1 times.

2. The symbol N and the current temperature are displayed (the temperature flashes, e.g.

3. Press the [-] key several times until

°C).

0ff

is displayed on the

screen.

4. To confirm, press the S key.

5. The symbol T appears on the display.

040412 - 7600585-01

Calenta 25s - 28c - 35s - 40c 7. Checking and maintenance

7 Checking and maintenance

7.1 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. The appearance if this service message on the boiler display is determined by the automatic control unit. Depending on the use of the boiler, the first maintenance message appears 3 years after installation of the boiler at the latest.

For more information, refer to the maintenance log attached to the appliance.

7.2 Preventive maintenance with automated service message

When it is time to carry out maintenance on the boiler, the following instructions are shown on the display:

In a yellow display:

4 The symbol ? 4 The symbol K 4 Maintenance message Z , B or c

Thanks to the automatically transmitted maintenance message, it is possible to carry out preventive maintenance and therefore use the maintenance kits defined by Remeha, thus reducing breakdowns to a minimum. The maintenance message indicates which kit should be used. These maintenance kits (A, B or C) are available from your spare parts supplier. If no other faults are noted during the inspection initiated subsequent to the maintenance message, these maintenance kits include all of the parts needed for the maintenance concerned (such as the gaskets, for example).

When a maintenance message is displayed, it must be acted upon within the 2 months following the appearance of the message.

4 If the iSense modulating controller is connected to the

device, then this service message is also passed to the iSense. In this way, the end user is requested to contact the installation company. See also the manual for the iSense controller.

040412 - 7600585-01

CAUTION

Reset the maintenance message to zero after each inspection.

T001629-A

T001630-A

...x

7. Checking and maintenance Calenta 25s - 28c - 35s - 40c

7.2.1. Resetting the automatic maintenance

message

A service message on the boiler display must be reset by a qualified installer after the maintenance service has been carried out using the relevant service set and after this has been entered in the checklist in the supplied service book. To do this, proceed as follows:

1. When the maintenance message is displayed, press key time.

c0de

2. Use keys [-] or [+] to input the installer code

appears on the display.

0012

3. Confirm using key S. The maintenance message is reset. The display returns to the current operating mode.

7.2.2. Dealing with the next maintenance

message and starting the new maintenance period

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. To do this, proceed as follows:

1. Press the two keys f simultaneously and then key [+] until the symbol \ flashes on the menu bar.

2. Press the S key.

operation

3600

3. Press key [+] several times until

4. Press the S key.

5. Use keys [-] or [+] to input the installer code

6. Confirm using key S.

7. Press key [+] several times until

example) flashing To determine the best time to carry out maintenance, the boiler is fitted with a single automatic maintenance indicator.

8. Press the [+] key a second time.

9. Press the S key.

10.Press key [+] to modify the value to 1.

and the number of hours of boiler

(for example) are displayed alternately.

flashes on the menu bar.

c0de

cl[0

appears on the display.

0012

5c[B

is displayed with B (for

appears on the display.

is displayed with 0 flashing.

11.Confirm using key S. The new maintenance period begins.

12.Press the

key 3 times to return to the current operating

mode.

After maintenance operations, fill in the corresponding checklist in the maintenance log provided. Stick maintenance sticker A, B or C from the maintenance kit concerned in the maintenance log and inside the front panel.

040412 - 7600585-01

Calenta 25s - 28c - 35s - 40c

7.3 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 been adapted to one of the following situations:

4 G20 (Gas H) or G31 (Propane)

4 high pressure systems

4 WTW coupling

4 CLV overpressure (combusted gas discharge

systems)

See the sticker on top of the boiler next to the identification plate.

7.3.1. Checking the hydraulic pressure

7. Checking and maintenance

The hydraulic pressure must reach a minimum of 0,8 bar. If the water pressure is lower than 0,8 bar, the symbol e will appear.

If necessary, top up the water level in the heating system (recommended hydraulic pressure between 1,5 and 2 bar).

7.3.2. Checking the ionization current

Check the ionization current at full load and low load. The value is stable after 1 minute. If the value lies below 3 µA, replace the ignition electrode.

¼ See chapter: "Reading the various current values", page 61.

7.3.3. Checking the transfer capacity

If the transfer capacity is noticably low (temperature too low and/or flow rate less than 6,2 l/min), clean the plate exchanger (domestic hot water side) and the water filter cartridge.

¼ See chapter: "Cleaning the plate exchanger (domestic hot water end) and the water filter cartridge", page 79

040412 - 7600585-01

T001525-A

T001526-A

T001631-B

...x

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.

7.3.5. Checking combustion

The check on combustion is done by measuring the percentage of O2/CO2 in the flue gas discharge flue. To do this, proceed as follows:

1. Unscrew the plug of the flue gas measurement point.

2. Connect the flue gas analyser.

CAUTION

Ensure that the opening around the sensor is completely sealed when taking measurements.

3. Set the boiler to full load. Press the two B keys simultaneously. The B symbol is visible on the menu bar and

appears in the

display. The boiler is now operating at full load.

4. Measure the percentage of CO2 and compare this value with the checking values given.

See chapter: "Setting the air/gas

ratio (Full load)", page 57.

5. Set the boiler to part load. Press the [-] key several times until

is displayed on the screen. The boiler is now operating on

part load.

6. Measure the percentage of CO2 and compare this value with the checking values given.

See chapter: "Setting the air/gas

ratio (Part load)", page 59.

040412 - 7600585-01

R000074-B

90º

Gas/Gaz

2 3

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.

4. Unscrew the two screws located under the front panel by a quarter turn and remove the panel.

5. Tilt the control box forwards by opening the holding clips located at the sides.

6. Check whether there is any water in the small hose on the automatic air vent.

7. If any leaks are detected, replace the air vent.

7.3.7. Checking the safety valve

1. Take out the flow collector located under the boiler.

2. Check whether there is any water in the end of the flow pipe on the safety valve.

3. If any leaks are detected, replace the safety valve.

7.3.8. Checking the siphon

1. Remove the siphon and clean it.

2. Fill the siphon with water.

3. Put the siphon back in place.

040412 - 7600585-01

T001220-B

X91

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.

2. Unscrew the top connection on the gas valve unit.

3. Disconnect the connector located under the fan.

4. Release the 2 clips holding the fan/mixing elbow unit in place on the heat exchanger.

5. Completely remove the fan/mixing elbow unit.

6. Tilt the burner and remove it, along with the heat exchanger gasket.

7. Use a vacuum cleaner fitted with a special endpiece (accessory) to clean the top part of the heat exchanger (combustion chamber).

8. Thoroughly clean with the vacuum cleaner again without the top cleaning brush on the endpiece.

9. Check (using a mirror, for example) whether any dust can still be seen. If so, hoover it up.

10.The burner does not require any maintenance, it is self-cleaning. Check that there are no cracks and/or other tears on the surface of the dismantled burner. If this is not the case, replace the burner.

11.Checking the ignition electrode / ionization sensor.

12.To re-assemble, perform the above actions in reverse order.

13.Open the gas inlet valves and reconnect the plug to the mains.

CAUTION

4 Remember to reconnect the connector to the fan.

4 Check that the gasket is correctly positioned between

the mixing elbow and the heat exchanger. (Completely flat in the appropriate groove means it is leak proof).

040412 - 7600585-01

T001528-A

Calenta 25s - 28c - 35s - 40c

7.4 Specific maintenance operations

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. Replacing the ionization/ignition electrode

Replace the ionization/ignition electrode in the following cases:

4 Ionization current <3 µA.

4 Electrode worn.

4 Electrode available in the maintenance kit.

7. Checking and maintenance

CAUTION

After maintenance operations, fill in the corresponding checklist in the maintenance log provided .

If replacement is necessary, proceed as follows:

1. Remove the cable from the ionization/ignition electrode on the ignition transformer.

2. Unscrew the 2 screws and remove the ionization/ignition electrode.

3. Replace the ionization/ignition electrode.

7.4.2. Cleaning the plate exchanger (domestic hot

water end) and the water filter cartridge

Depending on the water quality and the operating mode, limescale deposits may form in the plate exchanger and the water filter cartridge. Periodic descaling may therefore be necessary. As a general rule, a periodic inspection, along with cleaning, if necessary, is sufficient. The following factors may affect the periodicity:

4 Water hardness.

4 Composition of the limescale.

4 Number of hours' operation of the boiler.

4 Draw-off rate.

4 Domestic hot water set point temperature.

040412 - 7600585-01

T001622-C

H2O

+/+ H2O

7. Checking and maintenance Calenta 25s - 28c - 35s - 40c

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.

4. Remove the siphon.

5. Remove the clip holding the heating flow hose in place on the left side of the hydroblock.

6. Dismantle the heating flow hose on the left side of the hydroblock and not on the heat exchanger side (heating circuit).

7. Unscrew the 2 hexagonal socket screws located to the right and left of the plate exchanger.

8. Slightly turn the plate exchanger and carefully remove it from the boiler.

9. Clean the plate exchanger with a descaling product (e.g. citric acid with a pH of approximately 3). To do this, a specific cleaning appliance is available as an accessory. After cleaning, rinse thoroughly under running water.

10.Re-assemble all of the components.

040412 - 7600585-01

T001624-B

+/+ pH 3

+/+ H2O

7 8

H2O

Calenta 25s - 28c - 35s - 40c 7. Checking and maintenance

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.

3. Remove the air vent hose above the siphon.

4. Remove the siphon.

5. Remove the clip holding the water filter cartridge in place. While doing this, be sure that the silencer is left in place.

6. Remove the domestic water cartridge.

7. Rinse the water filter cartridge with tap water and, if need be, clean it with a descaling product (e.g. citric acid with a pH of approximately 3). After cleaning, rinse thoroughly under running water.

8. Replace the water filter cartridge if faulty or when the maintenance kit includes one.

9. Re-assemble all of the components.

040412 - 7600585-01

T002639-C

1 2

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.

4. Remove the siphon.

5. Remove the clip holding the heating return hose in place on the right side of the hydroblock.

6. Remove the heating return hose on the right side of the hydroblock and not on the heat exchanger side (heating circuit).

7. Unplug the actuator.

8. Remove the clip holding the 3-way valve in place.

9. Remove the 3-way valve.

Lift and rotate by a quarter turn.

10.Proceed as for dismantling in reverse.

CAUTION

Be careful of the positioning cams on the 3-way valve.

040412 - 7600585-01

T002517-B

X91

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.

2. Unscrew the top connection on the gas valve unit.

3. Disconnect the connector located under the fan.

4. Release the 2 clips holding the fan/mixing elbow unit in place on the heat exchanger.

5. Completely remove the fan/mixing elbow unit.

6. Replace the non-return valve located between the mixing elbow and the fan.

7. To re-assemble, perform the above actions in reverse order.

040412 - 7600585-01

T001529-B

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.

2. Fill the siphon with clean water up to the mark.

3. Put the siphon back in place.

CAUTION

Mount the vent hose above the siphon.

4. Carefully open the main water valve, fill the installation, vent it and, if need be, top it up with water.

5. Check the seals on the gas and water connections.

6. Switch the boiler back on.

After maintenance operations, fill in the corresponding checklist in the maintenance log provided.

040412 - 7600585-01

Calenta 25s - 28c - 35s - 40c 8. Troubleshooting

8 Troubleshooting

8.1 Error codes

The boiler is fitted with an electronic regulation and control unit. The heart of the control system is a microprocessor, the Comfort

fault is detected anywhere in the boiler, the boiler locks out and the display will show the fault code as follows:

In a red flashing display:

4 The symbol c 4 The symbol J 4 The fault code (for example e[01)

The meaning of the error codes is given in the error table. To do this, proceed as follows:

Error code

e[00

e[01

e[02

e[03

4 Note the error code displayed.

The error code is important for rapid and correct tracking of the type of problem and for any technical assistance from Remeha.

4 Press the J key for 2 seconds. If the error code continues to

display, search for the cause in the error table and apply the solution.

If the display does not show J but rather a, the boiler must be switched off and then switched on again after 10 seconds before the fault can be reset.

Description Probable causes Checking / solution

Storage unit PSU parameter not found

The safety parameters are incorrect

Flow temperature sensor short circuited

Flow temperature sensor open circuit

4 Bad connection 4 Check the wiring

4 Bad connection

4 PSU defective

4 Bad connection

4 Sensor fault

4 Sensor not or badly

connected

4 Bad connection

4 Sensor fault

4 Sensor not or badly

connected

4 Check the wiring

4 Replace PSU 4 Check the wiring

4 Check that the sensors are operating correctly

4 Check that the sensor has been correctly fitted

4 Replace the sensor if necessary 4 Check the wiring

4 Check that the sensors are operating correctly

4 Check that the sensor has been correctly fitted

4 Replace the sensor if necessary

040412 - 7600585-01

8. Troubleshooting Calenta 25s - 28c - 35s - 40c

Error code

e[04 e[05

e[06

e[07

e[08 e[09

e[10 e[11

e[12

Description Probable causes Checking / solution

4 Check the wiring

4 Replace the sensor if necessary

Temperature of heat exchanger too low

Exchanger temperature too high

4 Bad connection

4 Sensor fault

4 Sensor not or badly

connected

4 No circulation

4 Vent the air in the heating system

4 Check the circulation (direction, pump, valves)

4 Check the water pressure

4 Check that the sensors are operating correctly

4 Check that the sensor has been correctly fitted

4 Check the cleanliness of the heat exchanger

Return temperature sensor short circuited

Return temperature sensor open circuit

4 Bad connection

4 Sensor fault

4 Sensor not or badly

connected

4 Bad connection

4 Sensor fault

4 Sensor not or badly

connected

4 Check the wiring

4 Check that the sensor has been correctly fitted

4 Check that the sensors are operating correctly

4 Check the wiring

4 Check that the sensor has been correctly fitted

4 Check that the sensors are operating correctly

4 Check the wiring

4 Replace the sensor if necessary

Return temperature too low

Return temperature too high

4 Bad connection

4 Sensor fault

4 Sensor not or badly

connected

4 No circulation

4 Vent the air in the heating system

4 Check the circulation (direction, pump, valves)

4 Check the water pressure

4 Check that the sensors are operating correctly

4 Check that the sensor has been correctly fitted

4 Check the cleanliness of the heat exchanger 4 Replace the sensor if necessary

4 Vent the air in the heating system

Difference between the flow and return temperatures too great

4 Sensor fault

4 Sensor not or badly

connected

4 No circulation

4 Check the circulation (direction, pump, valves)

4 Check the water pressure

4 Check that the sensors are operating correctly

4 Check that the sensor has been correctly fitted

4 Check the cleanliness of the heat exchanger

4 Check that the heating pump is operating correctly 4 Check the wiring

4 Replace the sensor if necessary

Temperature of heat exchanger above normal range (high-limit thermostat STB)

4 Bad connection

4 Sensor fault

4 Sensor not or badly

connected

4 No circulation

4 Vent the air in the heating system

4 Check the circulation (direction, pump, valves)

4 Check the water pressure

4 Check that the sensors are operating correctly

4 Check that the sensor has been correctly fitted

4 Check the cleanliness of the heat exchanger

040412 - 7600585-01

Calenta 25s - 28c - 35s - 40c 8. Troubleshooting

Error code

e[14

e[16

e[17

e[34

e[35

e[36

e[37

Description Probable causes Checking / solution

4 Check cabling of ignition transformer

4 Check the ionization/ignition electrode

4 No ignition

4 Check breakdown to earth

4 Check the condition of the burner set

4 Check the earthing

4 Defective control SU PCB 4 Purge the gas supply to remove air

4 Check that the gas valve is fully opened

4 Check the supply pressure

5 burner start-up failures

4 Ignition arc, but no flame

formation

4 Check the operation and setting of the gas valve unit

4 Check that the air inlet and flue gas discharge flues

are not blocked

4 Check the wiring on the gas valve unit

4 Defective control SU PCB 4 Check that the gas valve is fully opened

4 Presence of the flame

but insufficient ionization (<3 µA)

4 Check the supply pressure

4 Check the ionization/ignition electrode

4 Check the earthing

4 Check the wiring on the ionization/ignition electrode

4 Ionization current

present when there

False flame signal

should not be a flame

4 Ignition transformer

defective

4 Gas valve defective

4 Check the ionization/ignition electrode

4 Check the gas valve and replace if necessary

4 Set the CO

4 The burner remains very

hot: CO2 too high

Problem on the gas valve SU PCB

Fan fault

4 Bad connection

4 Defective SU PCB

4 Bad connection

4 Fan defective

4 Check the wiring

4 Inspect the SU PCB and replace it if need be 4 Check the wiring

4 Replace the fan if need be

4 Check for adequate draw on the chimney connection

4 Bad connection

4 Replace the sensor if necessary

4 Check the circulation (direction, pump, valves)

4 Check that the sensors are operating correctly

4 Check that the sensor has been correctly fitted

Flow and return reversed

4 Sensor fault

4 Sensor not or badly

connected

4 Water circulation

direction reversed

4 Purge the gas supply to remove air

4 Check that the gas valve is fully opened

4 Check the supply pressure

5x Flame loss

4 No ionization current

4 Check the operation and setting of the gas valve unit

4 Check that the air inlet and flue gas discharge flues

are not blocked

4 Check that there is no recirculation of flue gases

Communication error with the SU PCB

4 Bad connection

4 Check whether the SU PCB has been correctly fitted

in the connector on PCU PCB

040412 - 7600585-01

T001632-B

8. Troubleshooting Calenta 25s - 28c - 35s - 40c

Error code

e[38

e[39

e[40

Description Probable causes Checking / solution

Communication error with the SCU PCB

Shutdown input in locked-out mode

HRU/URC unit test error

4 Bad connection

4 Defective SCU PCB 4 Bad connection

4 External cause

4 Parameter incorrectly

set

4 Bad connection

4 External cause

4 Parameter incorrectly

set

8.2 Shutdowns and lock-outs

4 Check the wiring

4 Replace SCU PCB

4 Check the wiring

4 Suppress the external cause

4 Check the parameters

4 Check the wiring

4 Suppress the external cause

4 Check the parameters

8.2.1. Blockage

If the blocking conditions still exist after several start up attempts, the boiler will switch into locking mode (fault). The boiler can only start operating again once the causes of the lock-out have been rectified and after pressing the > key.

8.2.2. Blocking

A (temporary) blocking mode is a boiler operating function caused by an unusual situation. In this case, the display gives a code of blocking (code 5t[9). The boiler control will try to re-start several times. The boiler will start up again after the blocking conditions have been eliminated. The shutdown codes can be read out as follows:

1. Press the two f keys simultaneously.

2. Confirm by pressing key S.

the shutdown code 9.

3. Press the [+] key.

appears on the display.

is displayed, alternating with

040412 - 7600585-01

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

5v[0

5v[1

5v[2

5v[7

Parameter error

Maximum flow temperature exceeded

Maximum increase of the flow temperature has been exceeded

Maximum difference between the flow and return temperature exceeded

4 Parameter error on the

4 Non-existent or

4 Sensor error

4 Non-existent or

4 Sensor error

4 External cause

5v[8

No release signal

4 Parameter error

4 Bad connection 4 Mains supply incorrectly

5v[9

Phase and neutral of mains supply mixed up

4 Floating or 2 phase

4 External cause

5v[10

Shutdown input is open

4 Parameter error

4 Bad connection 4 External cause

5v[11

Shutdown input active or frost protection active

4 Parameter error

4 Bad connection 4 Bad connection with BUS

4 SCU PCB not installed in

4 Water pressure too low

5v[13

5v[14

Communication error with the SCU PCB

Water pressure too low

4 Non-existent or

5v[15

5v[16

5v[17

(1) These lock-outs are not stored in the fault memory

Gas pressure too low

Configuration fault or SU

(1)

PCB not recognised

Configuration fault or default

(1)

parameter table incorrect

4 Incorrect setting of the

4 Wrong SU PCB for this

4 Parameter error on the

PSU PCB

insufficient circulation

wired

network

the boiler

insufficient circulation

Gps gas pressure switch on the SCU PCB

boiler

PCU PCB

4 Reset df and dV

4 Restore parameters with Recom 4 Check the circulation (direction, pump,

valves)

4 Reasons for the heat demand 4 Check the circulation (direction, pump,

valves)

4 Check the water pressure

4 Check that the sensors are operating

correctly

4 Check that the sensor has been correctly

fitted

4 Check the cleanliness of the heat exchanger 4 Check the circulation (direction, pump,

valves)

4 Check the water pressure

4 Check that the sensors are operating

correctly

4 Check that the sensor has been correctly

fitted

4 Check the cleanliness of the heat exchanger 4 Suppress the external cause

4 Check the parameters

4 Check the wiring

4 Invert phase and neutral 4 Set parameter p43 to 0

4 Suppress the external cause

4 Check the parameters

4 Check the wiring 4 Suppress the external cause

4 Check the parameters

4 Check the wiring

4 Carry out automatic detection

4 Check the water pressure

4 Fill the boiler and the installation with water 4 Check that the gas valve is fully opened

4 Check the supply pressure

4 Check whether the Gps gas pressure control

system has been correctly fitted

4 Replace the Gps gas pressure control

system if need be

4 Replace the SU PCB

4 Replace the PCU PCB

040412 - 7600585-01

8. Troubleshooting Calenta 25s - 28c - 35s - 40c

Shutdown code

5v[18

5v[19

5v[20

5v[21

5v[22

5v[25

(1) These lock-outs are not stored in the fault memory

Description Probable causes Checking / solution

Configuration fault or PSU

(1)

PCB not recognised

Configuration fault or

(1)

parameters df-dV unknown

Configuration procedure

(1)

active

Communication error with the SU PCB

No flame during operation

Internal error on the SU PCB

4 Wrong PCU PCB for this

4 Active for a short time

4 Bad connection

4 No ionization current

boiler

after switching on the boiler

4 Replace the PCU PCB

4 Reset df and dV

4 No action required

4 Check whether the PCU PCB has been

correctly fitted in the connector on SU PCB

4 Purge the gas supply to remove air

4 Check that the gas valve is fully opened

4 Check the supply pressure

4 Check the operation and setting of the gas

valve unit

4 Check that the air inlet and flue gas discharge

flues are not blocked

4 Check that there is no recirculation of flue

gases

4 Replace the SU PCB

8.3 Error memory

The boiler control is equipped with an error memory. The last 16 errors encountered are recorded in this memory.

In addition to the error codes, the following data are also saved:

4 Number of times that the error occured: (MK[xx). 4 Boiler operating mode selected (5t[xx). 4 The flow temperature (t1[xx) and the return temperature

(t2[xx) when the error occured.

To view the error memory, you first have to enter access code

0012.

040412 - 7600585-01

T001530-B

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

on the display.

3. Use keys [-] or [+] to input the installer code

4. Press the S key.

er[xx

appears on the display.

0012

5. The fault list or shutdown list can be displayed by pressing the [-] or [+] key..

6. Confirm using key S.

er[xx

is displayed with

flashing = Last error which occured, For example

7. Use the [-] or [+] key to scroll through the faults or shutdowns.

8. Press the S key to display the details of the faults or shutdowns.

9. Press the [-] or [+] key to view the following information:

= Number of times that the error occured.

M[1

= The number of operating hours.

= State.

= Sub-status.

= Supply temperature ºF/ºC.

= Return temperature ºF/ºC.

= Calorifier temperature ºF/ºC.

= Outside temperature ºF/ºC (Only with an outside

temperature sensor).

= Solar boiler temperature ºF/ºC.

= Internal set point ºF/ºC.

= Ionization current (µA).

= Fan speed in rpm.

= Water pressure psig/bar.

= Supplied relative heat output (%).

10.Press the

displayed with

key to interrupt the display cycle.

flashing = Last error which occured.

11.Use the [-] or [+] key to scroll through the faults or shutdowns.

12.Press the

13.Press

key to show the fault list or shutdown list.

times on the key 2 to exit the error memory.

appears

er[xx

040412 - 7600585-01

T000831-D

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

on the display.

3. Use keys [-] or [+] to input the installer code

4. Press the S key.

er[xx

appears on the display.

0012

5. The fault list or shutdown list can be displayed by pressing the [-] or [+] key..

6. Confirm using key S.

er[xx

7. Press the [+] key several times until

is displayed with

er[cl

is displayed on the

screen.

8. Press the S key.

cl[0

is displayed with 0 flashing.

9. Press key [+] to modify the value to 1.

10.Press the S key to delete the errors from the error memory.

11.Press

times on the key 3 to exit the error memory.

appears

flashing.

040412 - 7600585-01

Calenta 25s - 28c - 35s - 40c

9 Spare parts

9.1 General

9. Spare parts

When it is observed subsequent to inspection or maintenance work that a component in the boiler needs to be replaced, use only original spare parts or recommended spare parts and equipment.

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).

Always ensure that your return package is accompanied by the duly completed return form, see attached example. In this way, Remeha can more easily and more effectively expedite its warranty obligations.

Customer

Reference

Name

Address

Town/Postcode

Telephone

Contact person

Order number

Code no. Description

(1) This information can be found on the rating plate.

Serial number

(1)

Date

Type Installation date Reason for the exchange Reference

9.2 Spare parts

040412 - 7600585-01

T000428-C

2025

2028

2026

2027

2028

2024

2022

2023

2006

2002

2034

2013

2014

2012

2011

4016

2015

2033

2015

2005

2032

2010

2007

2004

2003

2009

2030

2032

2010

2020

2021

2016

2001

2018

2017

2019

2029

2022

1004

1001

1002

1006

1003

3004

3002

3011

3012 3008

3001

3008

3006

3010

3005

3003

3007

4011

4010

4014

4012

4013

4009

4004

4001

4014

4003

5010

4009

5009

4002

5037

5017

5014

5015

5008

5020

5017

5003

5023

5022

5018

5021

5002

5016

5019

5017

5007

5017

5029

5006

5018

5031

5030

5029

5027

5028

5004 5017

5001

5029

5032

5016

5017

9. Spare parts Calenta 25s - 28c - 35s - 40c

Calenta 25s, 28c

040412 - 7600585-01

T002883-A

1003

3005

3003

2016

2011 4008

2033

4007

2032 5012

4001

4014

4004

4003

5019

5017

5016(2X)

5004

4013

5029

5030

5027

5028

5055

5006

5020

5018

5007

5016

4009

4014

5001

2004

2025

2029

2028

2025

2022

2024

2019

2018

2013

2014

2015

2034

2003

5014

5017

5008

5015

2030

5025

2030

2009

5011

2007

20154015 /

2032

5012

2012

2017

2001

2021

2020

2002

2006

4009

5017 5018

5029

5032

5002

5031

4010

4011

4012

4002

2022

2010 5013

5017

5029

5017

5032

5031

5029

3002

3012

3001

3008

3006

3010

3004

3011

3008

2005

2010 5013

2027

1001

1004

4005

5009

5023

2023

4006

5010

5023

5003

5022

5004

5021

5022

2011 4008

2050 4016

2034

1002

1006

3007

EV 119377-1/5

Calenta 25s - 28c - 35s - 40c 9. Spare parts

Calenta 35s, 40c

040412 - 7600585-01

9. Spare parts Calenta 25s - 28c - 35s - 40c

040412 - 7600585-01

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

7600585

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.

040412

REMEHA Calenta 25s, Calenta 40c, Calenta 28c, Calenta 35s Installation And Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual