How the Bitzer IQ Module works in refrigeration systems with Bitzer reciprocating compressors

This video explains how the Bitzer IQ Module in refrigeration systems works with Bitzer reciprocating compressors.
The new, intelligent operating concept with Bitzer IQ Modules was developed to take full advantage of the potential of new technologies in terms of energy efficiency and straightforward integration into refrigeration systems, whilst ensuring simple service.
where the refrigeration industry is going in terms of gas

Afcon addresses where the industry in going in terms of gas use? 

Currently in Europe there are many discussions regarding the phasing out of the staple refrigerants previously used in Refrigeration applications namely R404a and R507a. Both these refrigerants have a high Global Warming Potential of over 4000. The current guidelines recommend using refrigerants with a GWP of 2500 or below. So the options being advocated in Europe are divided into following groups.
a. HFO/HFCs these being R448a, R449A, R452A - these are non-flammable synthetic refrigerants
b. Hydrocarbon’s these being Natural gas refrigerants – R290 Propane ( flammable refrigerants)
c. Ammonia
d. CO2
Several case studies have shown that the use of Hydrocarbon’s provide efficiencies with less refrigerant required and low power consumption on the plant. Also certain Refrigerant companies are manufacturing Hydrocarbon blends to be a direct replacement for R22 systems. However stringent guidelines must be observed because of the flammability.
Ammonia and CO2 are still only used by contractors who are specialists in these Natural gases so it is clearly not a solution to all requirements.
Since South Africa generally follows Europe – I think the large importers of refrigerants in South Africa will eventually govern the changeover via price and availability, indirectly influencing which refrigerants become the industry standard in the future. Watch out for the increasing prices on R404a/R507a eventually pushing contractors and suppliers to look at alternatives.
Bitzer recently advised in their Distributor’s meeting in Leipzig that new plants must be capable of longevity, so they must be designed with the long term ability of working on several refrigerants without the main components requiring change. This seems the best advice for the present.
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Afcon Supplier Profile

Afcon profiles Carel's Stuart Williams

Over the last 20 years Stuart has cultivated his knowledge at Cool Power, Barlows, Samsung, SANBS, and now at Carel. Currently Stuart’s focus is on expanding Carel’s brand name and sales in the KZN and Eastern Region.

Much like our last Customer Profile feature, Craig Scott, (click to view this article), Stuart enjoys the challenges that the industry and his job offers, namely providing high efficiency controls for each unique customer's need and project, at a competitive rate. Once this has been achieved Stuart enjoys site visits, where he can view the controls in action, and ultimately the successful job.

Carel Control’s products have been successfully used across many industries, including pharmaceutical, diary and retail. Over the last three years Stuart has been involved in many successful projects. One of these being the new Dairy Day dairy in Howick, as well as another with Cipla. Stuart was also involved in the installation of Carel’s first HEOS, water loop refrigeration system, in Durban.

Stuart’s impact at Carel can be seen by the considerable increase in Carel sales that have been achieved over the last three years, with Afcon being one of the its most successful wholesalers.




Afcon recently had the pleasure of attending Bitzer’s EMEA Distributor’s conference in Leipzig, Germany. The delegates come from the EMEA region – Europe, Middle East and Africa. This event occurs every two years and enables Bitzer distributors to stay informed of the latest innovations and future concepts.
One of the most impressive new options on the Bitzer compressors is their new IQ module, the CM-RC-01 device to replace standard SE-B1 motor protection module. This device has the following benefits:
It controls all the devices that are mounted on the compressor and comes from the factory pre-wired.
Bitzer compressor with IQ module
Oil heater
Oil protection
Motor Protection (PTC)
Discharge gas temperature protection
Pressure transducers (LP and HP)
Refrigeration Injection (RI)
Additional fan cooling Capacity Regulation (CRII)
Start Unloading (SU)
High Pressure switch
The device also allows for the control of CRII unloaders – meaning that you no longer require a sophisticated PLC controller only a device that has an external 0-10v signal.
The IQ device has a built in Data Logger and Bluetooth facility, plus as an added benefit compressors ordered with this device can have a 2 year extended warranty – since the compressor cannot run outside its envelope with this controller.

The main applications of Onda brazed plate heat exchangers is for the evaporation and condensation of refrigerant gas in air-conditioning and refrigeration plants, the hot water production in heat pumps and heat recovery. Onda's brazed plate heat exchangers are compatible with all modern refrigerants.

Only top quality materials are used in the manufacture the ONDA brazed plate heat exchangers.  The Plate heat exchangers are made from Stainless steel thickness 0.0138” (316L type), the connections are also Stainless steel (304L type) and the brazing material is copper. 


Onda advanced heat transfer systems anconAfcon Logo with Onda

Afcon is the sole importer of Onda Brazed Plate Heat Exchangers in South Africa.  Call us now for more information or browse our website





Afcon's stand at the SAIRAC GOLF Day

The SAIRAC Golf Day held on Friday 8th September, was the usual success and very well supported by the industry, with a record field of 38 four balls.  Thank you to Tarryn Ching for her exceptional organisation.  As always it is fantastic to meet our fellow HVAC&R colleagues in a relaxed atmosphere.

For the third year running Afcon sponsored the 11th hole.  We thank all of you who visited our hole, and are certain the banter and cheer experienced cannot have been rivalled by any other.  It was a glorious day out on the course in sunny Durban.  Our congratulations to the winners of the day and to the Airconditioning Project's four ball who won the SAIRAC trophy.

To view the images bigger please click on each image.  Our marketing team would love to hear your feedback on our new newsletter format.

Afcon SAIRAC Golf DayAfcon and Carel SAIRAC Golf Day






Afcon and Concorde Refrigeration SAIRAC Golf DayAfcon and Dragt & Associates SAIRAC Golf Day 





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Afcon & Daikin SAIRAC Golf Day

  Afcon & Daikin SAIRAC Golf Day





Afcon & Eurocool SAIRAC Golf Day

   Afcon & the Wild Duck Socks SAIRAC Golf Day





Afcon & Airconditioning Projects - Dave Cooper, Leigh Waller, Mark Cox SAIRAC Golf Day

Afcon, Airco and CS Air SAIRAC Golf Day

Afcon SAIRAC Golf Day





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Afcon & Eurocool SAIRAC Golf DayAfcon and Connies Refrigeration, Connie Steyn and Anna-Rett Steyn SAIRAC Golf Day





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Afcon Customer Profile - Craig Scott

This week we sat down with Craig Scott, of CS Air, to chat about where he started, where he is now, and everything in between.

Craig has been in the HVAC industry for 25 years, and first entered it at Republic Refrigeration and Airco, where his interest was sparked and he began his apprenticeship. Craig went on to work for Republic Refrigeration and Airco for two years thereafter, before moving to ACS, Air-conditioning and Pump Installations, where he worked for the next 10 years.

In 1999 Craig opened his own company and CS Air was born. Over the respective 18 years CS Air has worked on many exciting projects, and found it’s specialty in central plants particularly chilled water plants.

A current example of an exciting project that CS Air is working on, is the systems installation for the new Cornubia Virgin Active. Virgin Active has been a client of CS Air for nearly 25 years, and CS Air has been involved in the majority of Natal’s Virgin Active installations. Another project that CS Air has been able to “sink their teeth into” of late, is the new Sibaya Dunes development, which involves the installation of large Samsung VRV systems in the presidential apartments.

Craig is very passionate about what he does, and he states that his passion comes from his love of the challenge the HVAC industry provides. One of the major challenges of the industry is the technological advancements, which companies must keep abreast of. However Craig stated, that with the support of suppliers who bring in products that allow CS Air to provide the greatest efficiency and cost effectiveness to its clients, these challenges can be overcome.


Afcon Craig Scott CS Air



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What is the difference between Ethylene Glycol and Propylene Glycol? 

What You Need To Know

Both ethylene glycol and propylene glycol solutions will effectively lower the freezing point of water allowing it to be freely pumped through a variety of heat exchangers, and can be used interchangeably for most applications. While there are many minor variations in the properties between ethylene glycol and propylene glycol solutions, however there are two key differences that dictate which of the glycols is chosen for a particular application, namely toxicity and viscosity.


Ethylene glycol is more toxic than propylene glycol. About 2 - 4 ounces of ethylene glycol can be fatal if ingested by an adult human. Whereas, propylene glycol is a food additive and is not harmful to humans if ingested in moderate amounts. Therefore, propylene glycol solutions are preferred for many applications, particularly when human exposure can occur.


While differences in viscosity between ethylene glycol solutions and propylene glycol solutions at elevated temperatures are minimal, at temperatures below -18C the viscosity differences become significant. If heat transfer at these low temperatures is required, ethylene glycol solutions should be used. In addition, ethylene glycol solutions will require less pumping horsepower under cold conditions. If these liquid characteristics are important, ethylene glycol is usually chosen for the application.







 Why you need Major Tech Tools today

Major Tech test instruments have been designed and manufactured to operate under the harshest conditions, offering reliability and accuracy for Engineers, Electricians and Electronic Technicians. Major Tech’s instruments are all made to stringent specifications and offer top quality innovative product, as well as and reliability.Afcon carries a wide range of Major Tech products the most popular being the Multimeters, Clamp-on Meters, Thermo-Hygrometers, Thermometers etc. Afcon can advise and order any specialist equipment required. For a full llist of all the instrumentation both handhel and bench equipment that will assist you in carrying out your work, please contact us using the form button on home page and we will get back to you with the information.

 MT770 1000A AC Clamp Meter Major TechKTK0707SG Screw Driver Set Major TechMT685 Liquid Probe -50ºC ~ 649ºC Major Tech MT600 Digital Pocket Thermometer, -50°C ~ 150°C Major Tech MT25 AC Voltage & Current Data Logger Major Tech

KTV150 150mm Digital Calliper Major TechMT948 Thermo-Anemometer, Separate Vane Major Tech  MTD2 24 Hour Analogue Slim Industrial Timer Major Tech MTD10 Compact Digital Multimeter Major Tech




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What is “Dew Point”?

The Dew point is the temperature at which vapour will condense, or when associated with glide, the higher or highest boiling point of mixture.


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Which fouling factors are suggested for the selection of shell and tube heat exchangers?

The fouling factor is important for the selection of an evaporator. The values suggested to input in selection software are:

For evaporators:
- Normal water in closed circuit: 0,000043 m2K/W;
- Water in open circuit: 0,000086 m2K/W;
- Solutions with glycol <40%: 0,000086 m2K/W;
- Solutions with glycol >40%: 0,000172 m2K/W.

For condensers:
- Normal city water: 0,000043 m2K/W;
- Treated tower water: 0,000043 m2K/W;
- River water: 0,000086 m2K/W;
- Solutions with glycol <40%: 0,000086 m2K/W;
- Solutions with glycol >40%: 0,000172 m2K/W.




Eberle AC Controls

Eberle is a leading European brand that manufactures energy efficient residential and commercial heating and air-conditioning controls. Eberle has over 80 years of experience and prides itself on reliability, quality, technical excellence and sustainable production.

Afcon holds a wide range of, reasonably priced, Eberle controls. This range includes controls with dual heating and cooling options as well as single function controls. We also offer the choice of LED indicators and models with proportional outputs for heating and cooling.

For more information on Eberle AC Controls, and controls technical specifications, click here . . .


Eberle Airconditioning Controls Afcon







In 2014 F-Gas regulations, in Europe, were amended in order to prompt a phasedown of the use of HFCs. This regulation change was undergone with the hope that HFCs would be reduced to only 21% of its current usage by 2030. This goal is on track to being achieved as a 63% decrease is expected by 2018.

This phase down is being achieved through the introduction of quota allocations and sectorial bans on high-GWP HFCs as well as multiple governments taking further steps to reduce the use of refrigerants with a substantial impact on the environment.

Bitzer has expanded their range of compressors to meet this need for environmentally sustainable refrigeration. The Bitzer Ammonia Compressor Pack (ACP) does just that. Bitzer’s ACP is designed for a wide range of operations in high, mid and low temperature applications in industrial refrigeration and process cooling.

Bitzer Ammonia Compressor Afcon


Technical specifications

- Available with a capacity range of 100 to 450 TR

- Modular compressors units comprise up to 3 compressors

- Compressor packs can be connected (up to 9 compressors) and connected to a single controller

- Equipped with frequency inverter

- Common oil separator



- Optimal part load performance

- High efficiency: individual compressors can be turned on and off depending on requirements

- Maximum redundancy for high operating reliability: system has multiple ammonia screw compressors which increases its reliability over single industrial compressors

- Bitzer advanced oil management system

- Reduced installation costs

- Durability

- Fast availability for all replacement parts

For more infoamtion . . . 

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What does “Approach” mean in heat exchangers?

This term refers to the difference between the leaving process fluid temperature and the change of state temperature of the refrigerant. For evaporators, if water is cooled from 12°C to 6°C and evaporating temperature is 1°C, the approach is 5K. For condensers, if water is warmed from 30°C to 35°C and condensing temperature is 40°C, the approach is 5K.

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Bitzer Compressors and Ammonia Seminar

Following the success of last year’s Roadshow Bitzer South Africa offered another Road Show event in Durban yesterday, covering Bitzer compressors and Ammonia applications.

The event was held at the Durban Country Club. And was a great success. Thank you to all who attended, and to Bitzer South Africa for hosting.


If you are interested in the information discussed at this seminar . . .

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Afcon Bitzer Ammonia Compressor Seminar FridgemacAfcon Bitzer Ammonia Compressor Seminar

Afcon Bitzer Ammonia Compressor SeminarAfcon Bitzer Ammonia Compressor Seminar Fridgemac

Afcon Bitzer Ammonia Compressor Seminar


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What is “Bubble Point”?

The bubble point is the temperature at which a liquid forms bubbles (usually the lowest boiling point of one of the constituents of a mixture like R407C).





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