GENERAL

INTRODUCTION

During all manoeuvres and handling actions, every attempt

 

should be made to ensure the following unless unavoidable

mini HE C24, mini HE C28 and mini HE C32 are wall

and/or the weight is light.

mounted, low water content, balanced flue, condensing

F Keep back straight.

combination gas boilers.

F Avoid twisting at the waist.

Central heating (CH) output and domestic hot water (DHW)

F Avoid upper body/top heavy bending.

output are both fully modulating:

F Always grip with the palm of the hand.

 

---between 10.2 (34 936) and 24.6* (83 973) kW (btu/h) for model mini HE C24;

---between 12.1 (41 284) and 28.3* (96 488) kW (btu/h) for model mini HE C28.

---between 15.0 (51 180) and 32.2* (109 866) kW (btu/h) for model mini HE C32.

* outputs for G31 (propane) are slightly different. See section Boiler Data at page 4 for detailed figures.

Due to the high efficiency of the boiler a plume of water vapour will form at the terminal during operation.

The boilers are suitable for connection to fully pumped, pressurised sealed water systems ONLY.

A system bypass is not required when TRV’ s are fitted to all radiators (see Frame 5). The boiler incorporates an automatic bypass.

A circulating pump, pressure gauge, safety valve and heating expansion vessel are provided.

The CH flow temperature is controlled by a temperature probe. In DHW mode the boiler modulates to sustain a nominal adjustable water flow temperature of 55 ûC.

The boiler casing is of white painted mild steel with a drop---down controls access door.

The boiler temperature control is located behind the control panel door.

The main heat exchanger is made of copper.

The condensing heat exchanger (recuperator) and the DHW heat exchanger are stainless steel.

The system pipework must include drain cocks in appropriate places. Pipework may be taken downwards.

For upwards pipework installation an additional frame (optional) must be used (see frame 25).

OPTIONAL EXTRA KITS

Programmer Kit fits neatly within the casing. Separate fitting instructions are included with the kit. Note. If using an alternative programmer read Frame 33 first.

Horizontal Concentric Extension Ducts

Up to 2,7 m (8’ 10”) for mini HE C24, mini HE C28 models. Up to 1,8 m (5’ 11”) for mini HE C32 model.

Other available kits are listed in frame 9.

SAFE HANDLING

This boiler may require 2 or more operatives to move it to its installation site, remove it from its packaging base and during movement into its installation location. Manoeuvring the boiler may include the use of a sack truck and involve lifting, pushing and pulling.

Caution should be exercised during these operations.

Operatives should be knowledgeable in handling techniques when performing these tasks and the following precautions should be considered:

FGrip the boiler at the base.

FBe physically capable.

FUse PPE as appropriate, e.g. gloves, safety footwear.

FUse designated hand holds.

FKeep load as dose to the body as possible.

FAlways use assistance if required.

DHW OPERATION

With no call for CH the boiler fires only when DHW is drawn off. When there is a call for CH, the heating system is supplied at the selected temperature until DHW is drawn off. The output is then directed by the diverter valve to heat the secondary heat exchanger and supply a maximum draw---off of:

mini HE C24 10.0 (2.2) l/min (gpm) at 35 degree rise. mini HE C28 11.7 (2.6) l/min (gpm) at 35 degree rise. mini HE C32 13.1 (2.9) l/min (gpm) at 35 degree rise.

The nominal DHW temperature is 55 ûC, but water drawn off when the boiler has been on for central heating may be hotter than this, for a short period of time.

GAS SAFETY

Current Gas Safety (Installation and Use) Regulations or rules in force

The appliance is suitable only for installation in GB and IE and should be installed in accordance with the rules in force.

In GB, the installation must be carried out by a CORGI Registered Installer. It must be carried out in accordance with the relevant requirements of the:

FGas Safety (Installation and Use) Regulations

FThe appropriate Building Regulations either The Building Regulations, The Building Regulations (Scotland), Building Regulations (Northern Ireland).

FThe Water Fittings Regulations or Water byelaws in Scotland.

FThe Current I.E.E. Wiring Regulations.

Where no specific instructions are given, reference should be made to the relevant British Standard Code of Practice.

In IE, the installation must be carried out by a Competent Person and installed in accordance with the current edition of I.S.813 ”Domestic Gas Installations”, the current Building Regulations and reference should be made to the current ETCI rules for electrical installation.

Detailed recommendations are contained in the following British Standard Codes of Practice:

BS 5440:1 Flues (for gas appliances of rated input not exceeding 70 kW).

BS 5440:2 Ventilation (for gas appliances of rated input not exceeding 70 kW).

BS. 5449 Forced circulation hot water systems.

BS. 5546 Installation of gas hot water supplies for domestic purposes (2nd Family Gases)

BS 6700 Design, installation testing and maintenance of services supplying hot water for domestic use.

BS. 6798 Installation of gas fired hot water boilers of rated input not exceeding 70 kW.

BS. 6891 Low pressure installation pipes. Health & Safety Document No. 635.

mini HE --- Installation & Servicing

7

Page 6 Page 8
Page 7
Image 7
Mamiya C28, C32, C24 manual Introduction, Optional Extra Kits, Safe Handling, DHW Operation, GAS Safety
Page 6 Page 8

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