Deck Type Units


Deck units provide an energy efficient solution for independent or centralized air conditioning. These air conditioning units are formed by assembling the condensing unit, air handling unit (AHU) and electric control device on the same common foundation. The biggest advantage of deck type units is ease of installation. All it needs are outside cables for power, air ducts, and cooling water pipes to start running.

Coles’ deck type marine air conditioning units can be classified into two:


These types of compressors adopt a volumetric compression system using pistons and work much like an internal combustion engine. The pistons run up and down inside cylinders, producing suction and compression of the refrigerant gas. Each cylinder has a suction valve for the gas refrigerant and a discharge valve to deliver the gas to the condenser after having been compressed.

In general, these are noisy compressors and create considerable vibrations that are felt around the entire circuit. Moreover, these are more susceptible to liquid return. Their construction technology is however quite simple and well established, making these compressors the best choice in the past for low cost and low capacity commercial applications.

Reciprocating compressors are defined as open when one end of the crankshaft protrudes outside of the sump (the casing that houses the pistons and mechanisms inside the compressor) and can be opened. Semi-hermetic means the compressor itself and the motor are housed in the same casing, which is designed to be opened for inspection and servicing. In this case, the motor shaft and crankshaft are one single piece. Semi-hermetic compressors are made in such a way as to avoid air or dust from entering the mechanisms.

Reciprocating compressors are called hermetic when the casing is welded and sealed and the cylinder heads cannot be accessed for inspection or maintenance.

open reciprocating type deck unit
Open Reciprocating Type Deck Unit
semi hermetic reciprocating type deck unit
Semi-Hermetic Reciprocating Type Deck Unit


Scroll compressors use two scrolls, one fixed and the other moving and coupled to the motor. The scrolls are interleaved so as to be in contact with one another in various places and thus form a series of gradually thinner pockets of air towards the centre. The fluid is compressed by rotation of the orbiting scroll around the fixed scroll until being discharged in the centre.

Advantages of scroll compressors include smaller dimensions and lower weight. They also have very high efficiency at the design compressor ratio, which however decreases at different working conditions. Their best feature is low noise operation and reduced vibrations.

scroll type deck unit
Scroll Type Deck Unit


Over the past 73+ years Coles Refrigeration and Air-Conditioning have maintained their reputation as Newcastle’s leading air-conditioning and refrigeration company by ensuring their staff have the products, knowledge, expertise and experience to create efficient and reliable air-conditioning systems tailored to your specific requirements.

Contacting Coles refrigeration and Air-conditioning to organise a consultation with a sales engineer will ensure your system is able to meet all of your requirements in the most practical and efficient way.  This process is obligation free, free of charge and will provide you with not only a detailed quote but also honest valuable advice from recognised air-conditioning experts with decades of experience.

Client Reviews

  • Thank you Coles Refrigeration & Air Conditioning for the professional work you produced in installing the bar and kitchen at the Mark Hotel.

    Your professionalism, quality, honesty, and delivery timeframes were outstanding given you were under an extremely tight schedule to get the project completed. I was especially impressed with your effort to accommodate any additions to the original scope, including the client's request to refurbish the entire kitchen two weeks prior to Christmas. I have no hesitation in recommending you and Coles Refrigeration & Air Conditioning to future clients and trust we will continue to further strengthen the relationship between our companies.

  • Coles have been responsible for the provision, installation and servicing of all our beverage and catering equipment, air conditioning & general refrigeration. I have conducted business with Coles since 1994. I have no hesitation in recommending Coles Refrigeration & Air Conditioning to prospective clients.

  • We were impressed by the excellent sales advise, design, installation and after sales service we received. All equipment restoration was carried out professionally keeping costs to a minimum. Coles Refrigeration & Air Conditioning ensured that our budget was met and that we received the best available equipment within that budget. For future requirement, we will not hesitate to involve Coles Refrigeration & Air Conditioning. Thank you for the professional input and service!

  • Thank you for the excellent work produced by your staff during the fit out of our new kitchen. The stainless steel exhaust and benchwork are second to none. Our cool room, pantry and freezer are working beautifully and the shelving and the layouts are exactly to our requirements. I will always be available to be contacted to recommend the work you and your staff did on our new kitchen.

  • Throughout all the stages of development and construction, I always found the staff from Coles to be highly professional and diligent in their works. Cole's tradesmen who carried out the works at our site were always helpful and met our stringent OH&S requirements. The buildings that were refurbished present various challenges with timeframes and meeting relevant codes and standards. With Cole's help, we were able to meet and exceed all expectations. I have no hesitation in recommending Coles Refrigeration for any future works in which they tender.

  • Mitchel Cousins has presented at two workshops held by the Energy Hunter team, helping businesses gain an understanding of real life ways to improve performance, reliability and cost savings of plant and equipment. Mitchell displayed high level of knowledge in both his specific industry, as well as energy efficiency. It was a pleasure working with Mitchell and I would happily do so again.

  • I was on site this morning at 47 Darby Street for the RMS Fitout project, and the foreman was heaping a fair bit of praise on you guys for the quality and speed of work! Thanks for helping us out on this one.

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