Mamiya C24, C32, C28 manual From Fault finding

Page 53

FAULT FINDING

Continued from page

52 of fault finding

no

With the boiler and heating circuit warm does the burner pressure reduce if the heating temperature setting is reduced to minimum?

yes

no

When a DHW tap is

opened and the DHW temperature is set to maximum, does the water become hot?

Is there between 0V dc

and 16V dc at the connections on the modulating coil? (0=min, 16=max)

yes

Is the burner pressure within min and max value* with the boiler running?

yes

Repair faulty gas

valve

Is the boiler mode

setting correct?

(Refer to frame 62)

yes

no

no

Adjust burner pressure. Refer to frame 35.

no

Follow the instruction “Boiler mode setting” (Refer to frame 62)

Is the continuity of the

modulator harness

O.K?

yes

Repair faulty PCB

no

Repair or replace

faulty wiring

FAULT FINDING

yes

Is the red LED

illuminated on DHW

flow sensor?

yes

no

Is there 230V

ac between

Blue and

Black at the

3---way valve connection?

yes

Remove the

 

motor

 

assembly, with

 

230V at the

 

connections is

 

the spindle fully

no

retracted? Refer

 

to frame 76.

 

yes

Replace

faulty valve

body

assembly

no

Is the

continuity of

the 3---way

valve harness O.K?

yes

Repair faulty

PCB

Replace

faulty motor

assembly

no

Is there 5V dc between

Red and Blue on

connecting harness?

yes

no

Repair or

replace

faulty

wiring

no

Replace the

sensor. Is

red LED

illuminated?

yes

Faulty sensor now replaced

no

Is the harness continuity O.K?

yes

Repair faulty PCB

no

Dismantle the DHW detector valve and clean. Refer to frame 66.

Reassemble.

Does the DHW water become hot?

yes

Repair or

replace

faulty wiring

Repair or

replace

faulty DHW

detector

valve

Continued on page 58 of fault finding

* see Table 2 at page 4 for the correct value

mini HE --- Installation & Servicing

53

Page 52 Page 54
Image 53
Page 52 Page 54
Contents Installation and servicing Mini HE --- Installation & Servicing Document Amendments Boiler Data GeneralPerformance Data --- Central Heating Domestic Hot WaterBenchmark Commissioning Checklist Details ContentsBoiler Clearances General Boiler Water ConnectionIntroduction GAS SafetyOptional Extra Kits Safe HandlingGAS Supply Flue Installation RequirementsSafe Handling of Substances Location of Boiler and Flue OutletWater Treatment Water Circulation SystemAIR Supply Additional PumpsRequirements Electrical SupplyHydraulic Loss Remaining pump capacity Mini HE C24, mini HE C28Size of expansion vessel Domestic HOT Water Requirements General Boiler Control InterlocksGeneral Boiler Water Circuit Diagram Installation Boiler Assembly InstallationPack a contents Installation UnpackingHardware pack contents Pack B contentsFitting the Flue System InstallationRefer to the following diagram for the model mini HE C32 Rear Flue AssemblyTwin Pipe Flue DuctWall Mounting Template rear flue Fitting the Extension Kits Installation Cutting the FlueRing Roof Flue KIT CONTENTS/OPTIONS Installation Fitting the Optional Roof FlueFlue Arrangement Installation Flue Terminal PositionFlue over 3 meters long Assembling the Roof Flue KITFit the service valves, washers and tail pipes as shown Installation Fitting the Wall Mounting PlateMounting the Boiler ConnectionsCondensate Drain Safety Valve DrainLocate the gasket and flue turret on the top of the boiler Flues over 1 meter longElectrical Connections For external controls wiring see frameIncoming mains wiring detail Pictorial Wiring Control pcb Installation Functional Flow DiagramElectrical Connections for a Combi Boiler External Electrical ControlsInstallation Initial Lighting Minimum valve setting To Adjust PressuresMaximum valve setting Commissioning and Testing Anti Cycling SettingElectrical Installation Gas InstallationGeneral Checks Handing Over Installation GAS ConversionServicing Schedule ServicingServicing Removal of Outer and Inner Casing Cleaning the Heat Exchanger Servicing Burner Removal and CleaningRE---ASSEMBLY Burner Pressure CheckRemove the fan by sliding it towards left see the arrow Servicing FAN and Venturi Removal and CleaningBurner Replacement Spark and Detection Electrode ReplacementBurner Injectors Replacement When replacing any componentFlue Temperature Probe Replacement Servicing Overheat Thermostat ReplacementTemperature Probe Replacement Removal of CH temperature probeExpansion Vessel Replacement GAS Valve ReplacementAIR Pressure Switch Replacement Servicing FAN ReplacementVenturi Replacement Pump Replacement Complete Servicing Electronic CONTROL/IGNITION PCB Replacement Boiler mode setting CH Flow Switch Membrane Replacement Servicing CH Flow Switch ReplacementFlow limiter Servicing DHW Flow Switch ReplacementDHW Filter and Flow Limiter Replacement Recuperator Replacement Servicing Primary Heat Exchanger ReplacementDiverter Valve Internal Parts Replacement Servicing Diverter Valve Actuator ReplacementCH Drain Cock Replacement Servicing DHW Heat Exchanger ReplacementTo replace the condensate trap Condensate Trap ReplacementTo clean the condensate trap and drain OFF Normal operationFinding Fault FindingFrom Fault finding Fault Finding Fault Refer back to page 52 of fault finding to continue Fault Finding From 075535 Burner mod. mini HE C28, mini HE C32Fan mod. mini HE C28, mini HE C32 17398422 23 Installer Notification Guidelines GAS Boiler Commissioning Checklist Service Interval Record Ideal boilers Technical TrainingCorrectly Ignition at attempt Installer the contact fire not doesInstaller Water hot or GAS of Escape MaintenanceCleaning Clearances Minimum Lights DiagnosticBoiler the Light to

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.
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