Case Study – PLC & Electronics Expansion Valves Error with Heavy Contamination System







Name : Johannes Maersk
Type: Container Ship
Construction year : 2001
IMO: 9215189
Carrying Capacity: 2833 TEU
LOA: 216.3M
Width: 32.3M

Service Location: Anchorage, Singapore





The Problems & Concerns;

  1. Low Main AC system Performance
  2. Overhauling Operations on Main ACs N°1 & 2
  3. Internal parts replacement & decontamination
  4. PLC & electronics expansion valves error troubleshooting
  5. HVAC system renewal and commission


The Findings & Solution:

It was found that the vessel suffered from overall low HVAC performance which was due to the PLC malfunctioning, causing system unable to perform due to electronic based.

The provided solution was that we will be able to resolve PLC malfunction error as well as refurbished and retrofitted for both Main AC system through overhauling.



Case Study 5 Steps FlowChart - Johannes Maersk

The scenario..

This was a case of general HVAC malfunction. Low performance of the system was due to the 2 main AC compressors. The bad performance of both units caused cooling deficiency

as well as suction, discharge and oil pressure issues. Hence, general compressor overhauling services were proposed.

According to the number of operating hours of the compressors, we conducted operations of parts renewal and cleaning of the main AC as well as decontamination of compressors with nitrogen flushing.

Troubleshooting was done due to the PLC malfunction to bypass the electronics in order to kick start the system with overhauling of 2x Compressors SMC108S concurrently.

Thanks to our well organized stock management, we were able to provide our client with all required spare parts without delay.


what you need to know

PLC & Electronics Expansion Valves ERROR & TROUBLESHOOTING

As professionals, we bring to your attention the complexity of HVAC systems and especially when talking about electrical wiring and circuit boards. In addition to being highly technical, such operations can also turn out to be very dangerous for you and your crew. In this case study, PLC malfunction and error occured making the compressors to not load & unload properly. This lead our engineers to decide to bypass and build a new expansion valve which turned out successful.

Both compressers were running well after thanks to our PLC operations.


PLC & Electronics Expansion Valves ERROR & TROUBLESHOOTING

Over the years, we have developed unique work processes that guarantee safety, efficiency and quality.

Since system flushing is a long and meticulous operation to proper ensure the cleaning and decontamination, we are able to flush two compressors at the same time, which makes our operations much faster.

Overhauling operations on all types of Compressors

At Roger international, we know most compressor related issues come from poor maintenance or irregular routine checks. The compressors we conducted operations on are both Sabroe SMC108S types. Because we are familiar with Sabroe® products and have been working with them for years, we know how to offer you the latest improvements and technologies for your existing compressor.

If your piston compressor is either an SMC, TSMC or HPC model, we can upgrade it. This will make your compressor more reliable and save you money on maintenance and service. It is also a cost effective alternative to increasing refrigeration capacity. In addition, it can also lead to a higher running speed and increased capacity of your VSD-equipped machines.

Our team of experts offer adapted service intervals for compressors with 10 000, 15 000 and 20 000 running hours.

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Service Rendering on Compressors



Service Rendering on Air Compressors

Packaged Units


Spare Parts
Spare Parts Replacements

Evaporator Coils


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