Mamiya C32, C28, C24 manual Fault Finding

Page 54

FAULT FINDING

FAULT FINDING

Continued from page 52 of fault finding. Is there at least one of the LEDs flashing?

Is LED 1 flashing with

LED 2 on ?

yes

Is the heating circuit pressurised to at least 1 bar and fully vented of air?

yes

Remove the pump nut. Does the pump rotate freely when turned)

yes

When the pump

runs does the

spindle of the water

flow detector

extend to operate the micro switch? Refer to frame 63.

yes

Is there continuity between C and NO contacts on micro switch when the switch is operated?

yes

Is the continuity of

the micro switch

harness O.K?

yes

Replace faulty PCB

no

no

no

no

no

no

Are LED2 and LED 3

flashing?

yes

Check resistance of

CH temperature

probe. Is it between 12 kΩ and 1.5 kΩ ?

yes

Repair or replace

faulty wiring

Re---pressurise system and vent

Replace faulty pump

Replace faulty

diaphragm and clean

housing of debris, if any.

refer to frame 64.

Replace faulty micro

switch

Repair or replace

faulty wiring

no

no

Replace faulty thermistor

Are LED2 flashing and LED 3 on?

yes

Check resistance of DHW temperature probe. Is it between 12 kΩ and 1.5 kΩ ?

yes

Repair or replace

faulty wiring

no

no

Continued on page 55 of fault finding

Replace faulty

thermistor

54

mini HE --- Installation & Servicing

Image 54
Contents Installation and servicing Mini HE --- Installation & Servicing Document Amendments Performance Data --- Central Heating GeneralBoiler Data Domestic Hot WaterContents Benchmark Commissioning Checklist DetailsGeneral Boiler Water Connection Boiler ClearancesOptional Extra Kits GAS SafetyIntroduction Safe HandlingSafe Handling of Substances Flue Installation RequirementsGAS Supply Location of Boiler and Flue OutletAIR Supply Water Circulation SystemWater Treatment Additional PumpsElectrical Supply RequirementsMini HE C24, mini HE C28 Size of expansion vesselHydraulic Loss Remaining pump capacity General Boiler Control Interlocks Domestic HOT Water RequirementsGeneral Boiler Water Circuit Diagram Installation Installation Boiler AssemblyHardware pack contents Installation UnpackingPack a contents Pack B contentsInstallation Fitting the Flue SystemTwin Pipe Rear Flue AssemblyRefer to the following diagram for the model mini HE C32 Flue DuctWall Mounting Template rear flue Installation Cutting the Flue RingFitting the Extension Kits Installation Fitting the Optional Roof Flue Roof Flue KIT CONTENTS/OPTIONSInstallation Flue Terminal Position Flue ArrangementAssembling the Roof Flue KIT Flue over 3 meters longMounting the Boiler Installation Fitting the Wall Mounting PlateFit the service valves, washers and tail pipes as shown ConnectionsLocate the gasket and flue turret on the top of the boiler Safety Valve DrainCondensate Drain Flues over 1 meter longFor external controls wiring see frame Incoming mains wiring detailElectrical Connections Pictorial Wiring Installation Functional Flow Diagram Control pcbExternal Electrical Controls Electrical Connections for a Combi BoilerInstallation Initial Lighting To Adjust Pressures Maximum valve settingMinimum valve setting Electrical Installation Anti Cycling SettingCommissioning and Testing Gas InstallationGeneral Checks Installation GAS Conversion Handing OverServicing Servicing ScheduleServicing Removal of Outer and Inner Casing RE---ASSEMBLY Servicing Burner Removal and CleaningCleaning the Heat Exchanger Burner Pressure CheckServicing FAN and Venturi Removal and Cleaning Remove the fan by sliding it towards left see the arrowBurner Injectors Replacement Spark and Detection Electrode ReplacementBurner Replacement When replacing any componentTemperature Probe Replacement Servicing Overheat Thermostat ReplacementFlue Temperature Probe Replacement Removal of CH temperature probeGAS Valve Replacement Expansion Vessel ReplacementServicing FAN Replacement Venturi ReplacementAIR Pressure Switch Replacement Pump Replacement Complete Servicing Electronic CONTROL/IGNITION PCB Replacement Boiler mode setting Servicing CH Flow Switch Replacement CH Flow Switch Membrane ReplacementServicing DHW Flow Switch Replacement DHW Filter and Flow Limiter ReplacementFlow limiter Servicing Primary Heat Exchanger Replacement Recuperator ReplacementServicing Diverter Valve Actuator Replacement Diverter Valve Internal Parts ReplacementServicing DHW Heat Exchanger Replacement CH Drain Cock ReplacementCondensate Trap Replacement To clean the condensate trap and drainTo replace the condensate trap Normal operation OFFFault Finding FindingFrom Fault finding Fault Finding Fault Refer back to page 52 of fault finding to continue Fault Finding From Fan mod. mini HE C28, mini HE C32 Burner mod. mini HE C28, mini HE C32075535 17398422 23 Installer Notification Guidelines GAS Boiler Commissioning Checklist Service Interval Record Technical Training Ideal boilersInstaller the contact fire not does Installer Water hot orCorrectly Ignition at attempt Maintenance CleaningGAS of Escape Lights Diagnostic Boiler the Light toClearances 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.