Mamiya C28, C32, C24 manual Servicing Electronic CONTROL/IGNITION PCB Replacement

Page 43

SERVICING

62ELECTRONIC CONTROL/IGNITION PCB REPLACEMENT

1Disconnect the electrical supply.

2Gain access to the controls area by removing the boiler front panel and pulling the control panel (refer to frame 30).

3Remove the screws A and remove the service panel

4To gain access to the electronic control/ignition p.c.b. remove the screws B and remove the control panel lid.

B

SERVICING

A

B

Control panel lid

Service panel

5Remove all the wiring connected to the electronic control/ignition p.c.b.

To disconnect the connectors indicated, delicately flex the hook present on one side of each socket.

8Unscrew the four screws that hold the electronic control/ignition p.c.b. on to the control panel.

9Remove it by lifting its rear edge and freeing it from any of the wiring.

10Re---assemble in reverse order.

Important

When re---assembling the electronic control/ignition p.c.b.:

11Fit the p.c.b. into the control panel by first inserting the front lower edge under the control knob shafts. Lower the rear edge and ensure that no wiring is trapped beneath.

12Insert the spindles in the control panel knobs until the notch C reaches the potentiometer edge. It is not necessary to force them in the knob.

13While tightening the screws that fix the electronic control/ignition p.c.b. on the control panel, keep the p.c.b. towards the control panel fascia making sure of the contact between the boiler reset button D and the tab E. Replace the wiring connections ensuring correct engagement in the sockets

6To disconnect the connectors indicated in the next figure, delicately press the hook present on one side of each socket.

7Remove the spindles of the CH and DHW temperature adjustment knobs by delicately pulling them with pliers in the direction shown by the arrows.

C

 

 

C

D

E

 

Attention

 

 

After installing the electronic control/ignition p.c.b.:

14Make sure the CH () and DHW ( ) temperature

adjustment knobs can move freely for the complete range. If not, remove the spindle again as described at step 7, turn the knob half a turn and re---insert the spindle.

15Operate the boiler and close the gas inlet cock so that the boiler goes into the safety lock---out state.

Verify the correct operation of the boiler reset button by pressing and releasing it.

16Open the gas inlet cock and check the boiler operates correctly.

The replacement PCB is supplied pre---set for Natural Gas and an anti cycling time of 3 minutes. If the installation requires adjustment of these settings refer to frames 35 and 36 for the procedures

mini HE --- Installation & Servicing

43

Page 42 Page 44
Image 43
Page 42 Page 44
Contents Installation and servicing Mini HE --- Installation & Servicing Document Amendments Domestic Hot Water GeneralBoiler Data Performance Data --- Central HeatingBenchmark Commissioning Checklist Details ContentsBoiler Clearances General Boiler Water ConnectionSafe Handling GAS SafetyIntroduction Optional Extra KitsLocation of Boiler and Flue Outlet Flue Installation RequirementsGAS Supply Safe Handling of SubstancesAdditional Pumps Water Circulation SystemWater Treatment AIR SupplyRequirements Electrical SupplySize of expansion vessel Mini HE C24, mini HE C28Hydraulic Loss Remaining pump capacity Domestic HOT Water Requirements General Boiler Control InterlocksGeneral Boiler Water Circuit Diagram Installation Boiler Assembly InstallationPack B contents Installation UnpackingPack a contents Hardware pack contentsFitting the Flue System InstallationFlue Duct Rear Flue AssemblyRefer to the following diagram for the model mini HE C32 Twin PipeWall Mounting Template rear flue Ring Installation Cutting the FlueFitting the Extension Kits Roof Flue KIT CONTENTS/OPTIONS Installation Fitting the Optional Roof FlueFlue Arrangement Installation Flue Terminal PositionFlue over 3 meters long Assembling the Roof Flue KITConnections Installation Fitting the Wall Mounting PlateFit the service valves, washers and tail pipes as shown Mounting the BoilerFlues over 1 meter long Safety Valve DrainCondensate Drain Locate the gasket and flue turret on the top of the boilerIncoming mains wiring detail For external controls wiring see frameElectrical Connections Pictorial Wiring Control pcb Installation Functional Flow DiagramElectrical Connections for a Combi Boiler External Electrical ControlsInstallation Initial Lighting Maximum valve setting To Adjust PressuresMinimum valve setting Gas Installation Anti Cycling SettingCommissioning and Testing Electrical InstallationGeneral Checks Handing Over Installation GAS ConversionServicing Schedule ServicingServicing Removal of Outer and Inner Casing Burner Pressure Check Servicing Burner Removal and CleaningCleaning the Heat Exchanger RE---ASSEMBLYRemove the fan by sliding it towards left see the arrow Servicing FAN and Venturi Removal and CleaningWhen replacing any component Spark and Detection Electrode ReplacementBurner Replacement Burner Injectors ReplacementRemoval of CH temperature probe Servicing Overheat Thermostat ReplacementFlue Temperature Probe Replacement Temperature Probe ReplacementExpansion Vessel Replacement GAS Valve ReplacementVenturi Replacement Servicing FAN ReplacementAIR Pressure Switch Replacement Pump Replacement Complete Servicing Electronic CONTROL/IGNITION PCB Replacement Boiler mode setting CH Flow Switch Membrane Replacement Servicing CH Flow Switch ReplacementDHW Filter and Flow Limiter Replacement Servicing DHW Flow Switch ReplacementFlow limiter Recuperator Replacement Servicing Primary Heat Exchanger ReplacementDiverter Valve Internal Parts Replacement Servicing Diverter Valve Actuator ReplacementCH Drain Cock Replacement Servicing DHW Heat Exchanger ReplacementTo clean the condensate trap and drain Condensate Trap ReplacementTo replace the condensate trap OFF Normal operationFinding Fault FindingFrom Fault finding Fault Finding Fault Refer back to page 52 of fault finding to continue Fault Finding From 173984 Burner mod. mini HE C28, mini HE C32075535 Fan mod. mini HE C28, mini HE C3222 23 Installer Notification Guidelines GAS Boiler Commissioning Checklist Service Interval Record Ideal boilers Technical TrainingInstaller Water hot or Installer the contact fire not doesCorrectly Ignition at attempt Cleaning MaintenanceGAS of Escape Boiler the Light to Lights DiagnosticClearances Minimum

C28, C24, C32 specifications

The Mamiya C series is celebrated among photography enthusiasts for its unique twin-lens reflex (TLR) design, offering both a classic aesthetic and innovative features that set it apart in the world of medium format cameras. The C32, C24, and C28 models represent a range of technology and design advancements that cater to various shooting needs.

The Mamiya C32, introduced in the early 1970s, is renowned for its precision engineering and versatility. This model features interchangeable lenses, allowing photographers to switch between different focal lengths for creative flexibility. The camera supports 120 and 220 film formats, enabling higher film capacities for extended shooting sessions. An essential feature of the C32 is its built-in light meter, which enhances exposure accuracy by providing real-time readings. The camera's bright waist-level finder offers excellent viewing comfort and composition aid, attracting those who appreciate a more hands-on shooting experience.

Next in line, the Mamiya C24 offers a slightly more compact and lighter design, making it an appealing option for documentary and street photographers. While still featuring the electronic leaf shutter system utilized in the C32, the C24 omits built-in metering, which encourages users to develop their exposure skills. The lens selection remains robust, with options ranging from wide-angle to telephoto, allowing for creative versatility. The C24's rugged build quality and reliable shutter performance make it a trusted companion in various shooting conditions.

Lastly, the Mamiya C28 provides a perfect blend of portability and advanced capabilities. With its ergonomic design and improved lens coatings, the C28 offers enhanced image quality with better contrast and sharpness. Similar to its predecessors, it utilizes an interchangeable lens system but enhances user convenience through quick-to-use shutter speeds and aperture settings. The camera is also compatible with a range of accessories, such as flash units and close-up attachments, further expanding its creative potential.

In summary, the Mamiya C32, C24, and C28 each present unique features and technological advancements that cater to various types of photographers. Whether it's the precision of the C32, the compact convenience of the C24, or the versatile performance of the C28, these cameras maintain a special place in the hearts of medium format enthusiasts, showcasing the blend of craftsmanship and innovation that Mamiya is known for.
Top Page Image Contents