Atag i24C Technical Manual
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Atag i24C Technical Manual

Service engineer edition
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Appliance
Technical Guide
SERVICE ENGINEER EDITION
(2019 ONWARDS)

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Summary of Contents for Atag i24C

  • Page 1 Appliance Technical Guide SERVICE ENGINEER EDITION (2019 ONWARDS)
  • Page 2 The heating industry has just had an upgrade Now you have too We will help you grow and protect your business.

  • Page 3: Table Of Contents

    COMBI BOILER CENTRAL HEATING MODE (CH) 1 9 COMBI BOILER HOT WATER MODE (DHW) ELECTRICAL DIAGRAM Combi boiler CH mode ELECTRICAL FUNCTIONS Combi boiler DHW mode ATAG 3-PORT EXTERNAL DIVERTER VALVE KIT (vented cylinder) System & regular boiler central (unvented cylinder) heating mode ROUTINE SERVICING...

  • Page 4: Appliances Covered And Serial Number

    Appliances covered and serial number MODEL GC NUMBER i24C Combination Boiler 47-310-36 i28C Combination Boiler 47-310-37 i36C Combination Boiler 47-310-38 i40C Combination Boiler 47-310-39 iC Economiser 27 Plus Combination Boiler 47-310-40 iC Economiser 35 Plus Combination Boiler 47-310-41 iC Economiser 39 Plus Combination Boiler...

  • Page 5: Ic & Ic Economiser Plus Combination Boilers Technical Data

    & iC Economiser Plus combination boilers technical data IC COMBINATION BOILERS i24C i28C i36C i40C Part number BC100324 BC100328 BC100336 BC100340 ErP Seasonal space heating energy efficiency class ErP Seasonal space heating energy efficiency (%) ErP Water heating energy efficiency class...
  • Page 6 iS system and iR regular boilers technical data iS SYSTEM BOILERS i15S i18S i24S i32S i40S Part number BS300315 BS300318 BS300324 BS300332 BS300340 ErP Seasonal space heating energy efficiency class ErP Seasonal space heating energy efficiency (%) CH output kW (50/30°C) 14.7 17.5 23.2...

  • Page 7: Boiler Layout

    Boiler layout iC ECONOMISER PLUS COMBINATION BOILER LAYOUT Heat exchanger Control panel Safety valve Ignition unit Three-way valve DHW Economiser Fan unit Circulation pump Siphon Air supply damper Filling loop Isolation valve flow CH Gas valve Flue gas exhaust Isolation valve gas Automatic de-aerator Combustion air supply Isolation valve cold water...

  • Page 8: Control Panel

    Control panel (All ATAG boiler range) 10 11 12 25/07/18 09:00 19° 23.2º 45° 75° 1.4 bar AUTO Press OK to enter Menu BACK RESET Controller buttons Selector Wheel Turn the wheel left or right to scroll through available menu options...

  • Page 9: Controls And Explanation Of The Functions

    Controls and explanation of the functions Central heating system 25/07/18 09:00 19° The CH program is always active after start-up. This is indicated by a rad symbol 60° 80° 1.5 bar If there is heat request, it is indicated by a square around the rad symbol and the description at the bottom of the screen of ‘C.Heating Active’.

  • Page 10: Hot Water Supply 1

    The pump will continue to run for 30 seconds due to the pump over run feature. The description at the bottom of the screen of ‘DHW pump over run’ (combi boiler or system boilers with ATAG 3-port diverter kit). Change the domestic hot water setpoint temperature From the controller Home screen,...

  • Page 11: Comfort And Eco

    25/07/18 09:00 19° Comfort and eco ECO and COMFORT are the hot water preheat settings, COMFORT for ON or ECO for OFF. By default the hot water supply is set to ECO. 60° 80° COMFORT mode is a domestic hot water setting that enables the boiler to fire up more often 1.5 bar to maintain the heat exchanger temperature.

  • Page 12: Always Active 1

    Always Active In always active mode COMFORT will be displayed continuously on the front display. To enable the Always Active comfort mode setting, Follow the steps below. From the controller Home screen, Turn the selector wheel to highlight Turn the selector wheel to highlight press OK.

  • Page 13: Disabled 1

    Time Based In time based mode a clock icon is displayed next to the ECO or COMFORT on the front screen to indicated this time based mode. To enable the Time Based comfort mode setting, follow the steps below. From the controller Home screen, Turn the selector wheel to highlight Press the BACK button one time.
  • Page 14 Disabled In disabled mode ECO will be displayed continuously on the front display. To enable Disabled (factory setting) comfort mode setting, follow the steps below. From the controller Home screen, Turn the selector wheel to highlight Option Disabled is highlighted. press OK.

  • Page 15: Frost Protection - The Danger Of Frost 1

    Frost protection - the danger of frost If there is danger of frost damage to the CH installation and there is no outside sensor connected, it is advisable to let the pump run continuously. If the pump is set to continuously this is displayed by a solid frost symbol (frost icon) To set pump to continuously on, proceed as follows: From the controller Home screen, Turn the selector wheel to highlight...

  • Page 16: Air Purge Program

    Pump kick and diverter valve kick Pump overrun Every 24 hours, if there is no heat demand from heating or DHW After the heating demand the burner will shut down and the pump will the pump will be started for 10 seconds and the diverter valve will run for a further 60 seconds.

  • Page 17: Commissioning The Boiler 1

    Commissioning the boiler Make sure before the boiler is put into operation that the boiler and installation have been fully vented. Vent the gas line and open the gas isolation valve to the boiler. The boiler requires no adjustment of the burner pressure and quantity as it has been set in the factory and should not be reset. Turn on the boiler electrical supply.

  • Page 18: Water Pressure Sensor 1

    The iC, iC Economiser Plus & iS boilers are supplied with a pressure sensor. Water pressure sensor This sensor control has following settings: The pressure sensor is also used to set the boiler free before every start. 0.5 bar: below this pressure the burner is blocked for operation Before the burner is set free the boiler does a pump check, it checks for 0.5 to 0.8 bar: boiler will reduce Tset max by 5°C an increase in pressure when the pump starts.

  • Page 19: Combi Boiler Central Heating Mode

    Combi boiler central heating mode (CH) C.H. Demand Pump Check by iC & iS Range Error Code: 140 Pump On Water Pressure - OK iR Range Error Code: 141 Diverter Valve CH Position Fan On 612 Fan Error Gas Valve Start Sequence Gas Valve Opens Spark...

  • Page 20: Combi Boiler Hot Water Mode (Dhw)

    Combi boiler hot water mode (DHW) D.H.W. Demand Pump Check by iC & iS Range Error Code: 140 Pump On Water Pressure - OK iR Range Error Code: 141 Diverter Valve D.H.W. Position Fan On 612 Fan Error Gas Valve Start Sequence Gas Valve Opens Spark...

  • Page 21: Combi Boiler Ch Mode 2

    Combi boiler CH mode CH controls With a demand from the heating controls after DHW demand, the boiler activates its 1 minute delay period. This is to prevent the heat exchanger from losing its heat too quickly in the event of a hot water demand. Then the pump starts and after 30 seconds the gradient control becomes active and the boiler fires up.

  • Page 22: Checking Combustion Co

    Checking combustion CO The CO percentage is set in the factory. This has to be checked during commissioning, inspection, maintenance and in case of a failure. This can be verified by means of the following action: • Ensure that the boiler is in operation and that the heat, which it produces, can be discharged •...
  • Page 23 Step 2: CO check on low load The low load of the boiler can be set by you as follows: • Turn the selector wheel until you reach 0%; • Press OK; The boiler will switch to minimum power output (low load) of the boiler; 25/07/18 09:00 19°...
  • Page 24 Checking combustion CO Step 3: Adjustment on the gas valve Adjust the gas valve only in case the measured values lie out of the range of the values mentioned in step 1 or 2. • Take the case off the boiler; •...

  • Page 25: Technical Menu

    Technical menu The boiler has a technical menu for engineers to use for altering settings / parameters and gaining information for example flow and return temperatures. To gain access to the technical menu follow these steps: From the controller Home screen, The screen below then appears press the BACK and OK buttons with the options:...

  • Page 26: Parameter Chapter

    Parameter chapter When the boiler is installed, it is in principle ready to be put into service. Most settings of the control system are already programmed from factory. To change this setting, proceed as follows: From the controller Home screen, The screen below then appears.

  • Page 27: Parameter Listing

    Parameter listing Parameter Name Description Unit Range Default number Combi 2. BOILER PARAMETERS 2.0 General 2.0.0 DHW Set point Water set point temperature in DHW mode during comfort periods °C 40 - 65 (Combi) 2.0.2 Gas Type 0 = Nat Gas 0 - 2 1 = LPG 2 = G230...
  • Page 28 Parameter Name Description Unit Range Default number Combi 2. BOILER PARAMETERS (CONTINUED) 2.7 Test & Utilities 2.7.0 Test mode Chimney sweeper function active 0 = OFF 1 = ON 0 - 1 2.7.1 Air purge Air purge function activation 0 - OFF 1 = ON 0 - 1 2.7.3 Force backup...
  • Page 29 Parameter Name Description Unit Range Default number Combi 4. ZONE 1 PARAMETERS (CONTINUED) 4.7 Zone 1 Regulation parameters (Continued) ( 4.7.1 Cont.) 2 = Medium 3 = Good 4.7.2 Building insulation level 0 = Poor 0 - 2 1 = Average 2 = Good 4.7.3 Building size...

  • Page 30: Testing The Boiler And Changing Settings

    Testing the boiler and changing settings The setting are accessible through a code: From the controller Home screen, The screen below then appears. 2.6 Manual settings. press the BACK and OK buttons Turn the selector wheel to highlight at the same time for 7 seconds Complete Menu.

  • Page 31: Gradient Speed Ch

    Gradient speed CH The gradient allows the boiler to increase the CH water temperature with a pre-set (parameter 2.0.6) number of degrees per minute. The number of degrees can be set between 1 and 15 per minute (factory set to 5 (NG) or 0 (LPG)). The Gradient control is a calculated increase of the T-Set value.

  • Page 32: Setting Up Integral And External Controls Options

    Setting up integral and external controls options With the upgraded i-range of ATAG boilers, there may be some settings you need to change depending on what controls you are using externally or in case you use the new integral programmer function.

  • Page 33: Integral Programmer

    ‘Screen Settings’, then ‘Time Program service type’ and there the setting can be changed to either ‘Extended Time Program’ (default) or ‘Program’. ‘Extended Time Program’ (default) would be for the ATAG eBus connect products, like ATAG ONE Zone & ATAG Cube (Thermoregulation setting no.2 &...

  • Page 34: Boiler Information

    Boiler information The boiler information is accessible through a code. To gain access to the boiler information, proceed as follows: From the controller Home screen, The screen below then appears. Option 8.3 Boiler Temperature is press the BACK and OK buttons Turn the selector wheel to highlight highlighted.

  • Page 35: Set The Heating Time Periods

    Set the heating time periods (if using integral programmer) The built-in time program of the boiler needs to be enabled. This change needs to be made in the ‘Time Program service type’ section and changed from the default ‘Extended Time Program’ to ‘Program’. ‘Program’...

  • Page 36: To Set In Time Periods

    To set in time periods From the controller Home screen, Turn the selector wheel to highlight Option Time program. Press OK. press OK. Complete Menu. Press OK. CH Setpoint Temp Time program / Manual Time program 25/07/18 09:00 19° Summer / Winter / OFF Holiday function 60°...
  • Page 37 Free time programming When selecting free time programming the next screen gives you a selection of ‘All zones’ or you can select the individual zone. Most will only have one zone being This screen is where you can have the The next selection choice is Modify to Zone 1, highlight Zone 1 and press OK heating start from 00:00 (midnight) with...

  • Page 38: Home Screen Settings

    Home screen settings There are two screen settings that can be chosen ‘Boiler base’ & ‘Boiler complete’. From the controller Home screen, Turn the selector wheel to highlight Screen shown Boiler base. press OK. Screen Settings. Press OK. CH Settings 25/07/18 09:00 DHW Settings 25/07/18 09:00...

  • Page 39: Setting Up Installer Details To Display On Boiler

    Setting up installer details to display on boiler This function allows you to have an installers name and phone number displayed on the boiler when the annual service is due (if service maintenance reminder function is enabled) or when some faults occur. From the controller Home screen, In the service options screen you can Select device, select Boiler 1.

  • Page 40: Annual Service Reminder

    Annual Service reminder This function allows a warning message to come up when the annual service is now due. The message will come up on the screen at a given time interval (months) that an installer has set in the boiler e.g. 12 months. This annual service reminder can also display the installers name and phone number display on the boiler if it has been entered.

  • Page 41: Weather Compensation

    Weather compensation To set the boiler to weather compensation, please set parameter 4.2.1 to 3 with an ON/OFF or OpenTherm controller or to 4 with an ATAG ONE Zone Turn the selector wheel to highlight the Turn the selector wheel to highlight Parameters Zone you want to set.

  • Page 42: Setting The Weather Compensation

    Setting the weather compensation To set up the weather compensation, follow the steps below: Turn the selector wheel to highlight the Turn the selector wheel to highlight 4.7.2 Turn the selector wheel to highlight 4.7.1 Parameters Zone you want to set. In this Building Insulation Level.
  • Page 43 Weather compensation settings calculation All these settings below calculate the ideal heating line for this specific property. For the Heating type, Building Insulation Level and the Building Size. 90.0 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 25.0 20.0 15.0 10.0 -5.0 -10.0...

  • Page 44: Equivalent Flue Lengths

    Equivalent flue lengths With the introduction of the upgraded ATAG i-range, there are some changes to the maximum equivalent flue lengths applicable to our boilers. The revised figures are: Flue lengths Concentric Flue system Ø 60 / 100mm & 80 / 125mm Dimensions flue gas system and air supply system.

  • Page 45: View Error Code History

    View error code history From the controller Home screen, Turn the selector wheel to highlight 007 The screen below then appears. press the BACK and OK buttons as the Technical Code. Press OK to Save. Turn the selector wheel to highlight at the same time for 7 seconds Complete Menu.
  • Page 46 ERROR ERROR DESCRIPTION CHECKS CODE Water pressure dynamic check Check 230V to pump Check pump is spinning via de-blocking centre screw Check PWM pump connection pins, cable and PCB connection CN9 Pressure > Pmax Check water pressure on analogue gauge Take any excess water out of the system Check expansion vessel air pressure with boiler drained of water Send Probe Damaged...

  • Page 47: Resistance Table Sensors

    Resistance table sensors RESISTANCE TABLE SENSORS Outside Sensor Flow Sensor, Return Sensor, DHW Sensor NTC 1k (25°C) NTC 10k (25°C) Temperature (°C) Resistance (KΩ) Temperature (°C) Resistance (KΩ) 4.574 55.047 4.358 32.555 4.152 19.873 3.958 18.069 3.774 16.447 3.600 14.988 3.435 13.674 3.279...

  • Page 48: Electrical Diagram

    IGNITION 3 WAY VALVE (INTERNAL) PUMP GAS VALVE 230V out 230V in 230V out 230V Control RETURN SENSOR T2 FLOW SENSOR T1 OPEN THERM OR ON/OFF THERMOSTAT (OPTION) ATAG ZONE (OPTION) OUTDOOR SENSOR T4 (OPTION) OUTSIDE THE BOILER TOP HMI...

  • Page 49: Electrical Functions

    DHW cylinder sensor Yellow (DHW) 10KΩ@ 25°C CN1 (7,8) OpenTherm BUS & ON / OFF connection Blue 22v DC CN3 (1,2) ATAG BUS connection 20v DC CN3 (5,6) Outside sensor T4 option Peach (Out) 1KΩ@ 25°C CN12 (1,2) DHW sensor T3 10KΩ@ 25°C...
  • Page 50 ATAG Zone connection (red) The ATAG One zone smart room thermostat is the primary candidate for use of the ATAG zone eBus connection. The smart room thermostat can also be substituted by another ATAG zone compatible room controller, this eBus enables the boiler to modulate set point temperatures for optimal efficiency.
  • Page 51 230V live output Neutral pump to pump Live pump terminal block Terminal block LV iC-Range terminal block ATAG Outdoor sensor 1kOhm* terminal block Terminal block LV iC-Range n.a. = not applicable ATAG Zone connection ATAG Outdoor sensor 1kOhm* Terminal block LV iC-Range OpenTherm or ON/OFF thermostat n.a.

  • Page 52: Atag 3-Port External Diverter Valve Kit

    ONE ZONE controller via the internet The ATAG 3-port diverter valve is to be fitted external connection and local weather station data. An optional to the boiler on the system pipework with the electrical outside sensor (ARZ0055U) can be added to the 3-port...
  • Page 53 230V live input only! Earth pump 230V live output Neutral pump to pump Live pump Terminal block LV iC-Range ATAG Outdoor sensor 1kOhm* n.a. = not applicable ATAG Zone connection OpenTherm or ON/OFF thermostat n.a. = not applicable Cylinder sensor ATAG ONE...

  • Page 54: (Vented Cylinder)

    ATAG 3-port external diverter valve kit including the ONE ZONE controller or Cube used with an unvented hot water cylinder (iS System boiler only) Unvented hot water cylinders Connect the cylinder sensor with the yellow connector to the yellow DHW volt free position and the ONE Zone control or...
  • Page 55 Terminal block LV iC-Range supplied with Safety limit Cylinder unvented cylinder thermostat thermostat ATAG Outdoor sensor 1kOhm* n.a. = not applicable NOT REQUIRED USE ATAG Zone connection CYLINDER SENSOR SUPPLIED OpenTherm or ON/OFF thermostat n.a. = not applicable Cylinder sensor...

  • Page 56: Routine Servicing

    Routine servicing ATAG Heating Technology advises on an interim service inspection with a flue gas analyser. A full strip down service is recommended at regular intervals or where analyser readings are not within correct safety standards. Required tools: • Cross head screwdriver •...
  • Page 57 Check expansion vessel pressure (every year) Note: If the interior of the boiler looks heavily polluted with dust / Isolate the boiler by the flow and return valves underneath the boiler. dirt, then a full service should be performed even with acceptable (the 2 outer black handled valves).

  • Page 58: Full Service

    Full Service For reasons of safety and economy, it is recommended that the boiler is serviced annually. Servicing must be performed by a competent person in accordance with BS 7967-4. After servicing, complete the relevant Service Interval Record section of the Benchmark Checklist, located on the inside back page of the installation &...
  • Page 59 • Disconnect the electrical connections from the fan (5) • Turn the left (6) and right (7) clamp bars a quarter turn with a 4mm Allen key and pull these out in a forward motion. Mind the direction of rotation (red control cams); •...
  • Page 60 • Check the venturi (13) for pollution and clean them with To clean the fan, it has to be removed from the upper tray a soft brush in combination with a vacuum cleaner, if and the venturi. Clean the impeller with a soft brush and a necessary vacuum cleaner.

  • Page 61: Ignition Electrode

    Ignition electrode Replacing the ignition electrode is necessary when the pins are worn. If the inspection hole is damaged, the entire ignition electrode has to be replaced. It is replaced as follows: • Take away the plug connections on the ignition electrode •...

  • Page 62: Expansion Vessel

    Expansion vessel The iC & iS boilers are featured with a built-in expansion vessel with a capacity of 8 litres and a pre-pressure charge 1 bar. Where the system volume is more than 100 litres or exceeds 2.65 bar at maximum heating temperature, then the expansion vessel size is insufficient for the CH system, an additional expansion must be installed.
  • Page 63 Notes...
  • Page 64 Why are so many installers switching to ATAG? A committed partner to Gas Safe registered businesses It doesn’t matter if you’re talking to your Technical Product Manager or one of our Account Managers, you’ll always get sound advice, exceptional service and a truly professional point of view.

This manual is also suitable for:

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