INSTALLATION

INSTALLATION

38 GENERAL CHECKS

Make the following checks for correct operation:

1Hot water.

a. Fully open all DHW taps in turn and ensure that water flows freely from them.

b. Close all taps except the furthest one from the boiler and check that the boiler is firing at maximum rate.

c. Ensure that DHW temperature of approximately 35 ûC rise is obtained at the tap. This corresponds to a flow rate of about

litres/min (gpm)

models

 

 

10.1 (2.2)

mini HE C24

 

 

11.7 (2.6)

mini HE C28

 

 

13.1 (2.9)

mini HE C32

 

 

d. Turn off the DHW tap.

2Central heating (all models)

Operate each control separately and check that the main burner or circulating pump, as the case may be, responds.

3Gas rate --- G20

Check the boiler gas rate when the boiler is at full output.

The gas rate checked at the gas meter, with no other appliance in use will normally be:

litres/min (ft3/min)

models

44.2 (1.56)

mini HE C24

 

 

51.2 (1.81)

mini HE C28

 

 

58.8 (2.08)

mini HE C32

 

 

If this check is not possible, ensure that the burner pressure is:

mbar (in. w.g.)

models

 

mini HE C24

10.8 (4.3)

 

mini HE C28

10.0 (4.0)

 

mini HE C32

13.0 (5.2)

 

 

4Water circulation system

Note. Fernox Superfloc flushing solution should be used during the flushing procedure.

a. With the system HOT examine all water connections for tightness.

b. With the system still HOT, turn off the gas, water and electricity supplies to the boiler and drain down, to complete the flushing process.

c. Refill the system, adding inhibitor (see ’Water Treatment’), if required.

Vent as necessary to clear all air and, again, check for water tightness. After venting, repressurise as required.

d. Balance the system. It is suggested that, initially, all radiator handwheel valves (or TRVs if fitted) be set fully open, that all lockshield valves be set a half ---turn open.

Make minor adjustments to each radiator to achieve the same differential on all.

5Flue system

Check the integrity of the flue outlet and air inlet system to the boiler ensuring no leaks are evident from piping joints or flue/air sampling points.

Finally, set the system controls to the users requirements.

If an optional programmer kit is fitted refer to the instructions supplied.

32

mini HE --- Installation & Servicing

Page 32
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Mamiya C24, C32, C28 manual General Checks

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.