FINDING

FAULT FINDING

Continued from

page 53

FAULT

 

no

Is there max burner

Is there a temperature rise

 

 

 

 

of 35 ûC across the DHW

 

 

pressure* when the

circuit at:

 

 

boiler first lights?

10.0 L/min 24 kW model

 

 

 

 

11.7 L/min 28 kW model

 

 

 

 

13.1 L/min 32 kW model

 

 

yes

 

 

 

 

 

 

 

 

 

 

 

 

 

yes

 

 

 

 

 

 

 

 

 

Is the maximum water

flow correct

10.0 L/min 24 kW model

12.0 L/min 28 kW model

14.0 L/min 32 kW model

 

 

no

Is there between 0V dc and

With the DHW hot

 

 

 

 

 

 

16V dc at the connections

does the burner

 

 

 

 

on the modulating coil?

pressure modulate if

 

 

 

 

(0=min, 16=max)

the DHW temperature

 

 

 

 

 

 

 

setting is reduced to

 

 

yes

 

 

minimum?

 

 

 

 

 

 

 

 

 

 

 

Is the burner pressure within

 

 

 

 

yes

 

 

 

 

min and max value* with

 

 

 

 

the boiler running?

 

 

 

 

 

 

 

 

 

 

 

yes

 

 

 

 

 

Replace faulty gas

 

 

 

 

 

 

 

 

valve.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

no

 

 

 

 

 

 

 

no

 

 

 

 

 

 

 

 

 

 

 

Is there > 17 mbar

 

 

 

 

 

Rectify gas supply

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

gas pressure at the

 

 

 

 

 

 

 

 

fault.

 

 

 

 

 

 

gas inlet?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Adjust the max setting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

on the gas valve. Refer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to frame 35. Check that

 

 

 

 

 

 

 

 

 

 

 

 

 

 

max burner pressure*

 

 

 

 

 

 

 

 

 

 

 

 

 

 

can be achieved.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

no

 

 

 

 

 

 

 

no

 

 

 

 

 

 

 

 

 

 

 

Is the cold water supply

 

 

 

 

 

Rectify water supply

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

adequate? refer to frame

 

 

 

 

 

 

 

 

fault.

 

 

 

 

 

 

6 and Table 1 at page 4.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check the DHW inlet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

filter. Remove debris

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and clean or replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

filter.

 

 

 

 

 

 

 

 

 

 

 

no

 

 

 

 

 

 

 

 

 

 

no

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the continuity of the

 

 

 

Repair or replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

modulator harness O.K?

 

 

 

faulty wiring.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

no

 

 

 

 

 

yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Adjust burner pressure.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refer to frame 35.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace faulty PCB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Boiler Operating

Correctly

* see Table 2 at page 4 for the correct value

58

mini HE --- Installation & Servicing

Page 57 Page 59
Page 58
Image 58
Mamiya C28, C32, C24 manual From
Page 57 Page 59

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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