Monthly Archives: May 2019

Chilled Water System EEV Service

Chilled Water System Service of EEV

The Expansion Valve Required Chilled Water System Service

Chilled water system service was being carried out because the mechanical parts of the expansion valve had failed. This particular valve is prone to this fault. It is an OEM part so our technician found the voltage for the motor and found a similar part with the same amount of steps

Electronic EEV Driver

The EEV driver was found to be functioning satisfactorily. Sometimes, depending on how the mechanical part has failed, this can be overloaded and burned out

Electronic Component Refurbishment

Where electronic parts, such as the EEV driver, are found to be burned out- Maximus Chillers has a refurbishment laboratory at head office. We have the capability to strip down the component and fault find where it has blown. Usually it is quite simple: the jammed mechanical part of the electronic expansion valve has burned out the power control on the driver for example. More complex fault finding and component replacement on the circuit board can be carried out also. Another option is to replace the driver with a like for like swap or retrofit to a different driver. In any case- we have the ability for: any part- any problem- any refrigerant anywhere

0161 370 7193

service@maximuschillers.com

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Pump Down of the Chilled Water System

The chilled water system was easily valved off and pumped down. This saves on the time and recovery vessel to pump the refrigerant out

Remove and Replace

Once pumped down, our engineer removed and replaced the valve, sealing it on it's knife edge seal. The wire was passed up the conduit and into the panel. The wiring colour scheme was different on the new valve so some time was taken to ensure it was wired up correctly

Open it up and Switch it on

After leak testing, the refrigerant system valves were opened back up and the plant switched back on. The correct superheat and subcooling valued were achieved concluding a successful chilled water system service visit

To read the Institute of Refrigeration guide to expansion valves Click Here


Industrial Refrigeration Oil Service

Industrial Refrigeration Oil Service

Industrial Refrigeration Oil Service

An industrial refrigeration oil service visit was arranged because of an oil return issue. Several fans had been down on the air cooled chilled water system. This causes the chilled water system to unload so as to prevent a fault occurring. The lower mass flow rate of the refrigerant caused oil to migrate to the low side of the system. Several vessels are available with various forms oil return control. These vessels were valved off. A two man team with the correct ammonia PPE and breathing apparatus carried out the job

Not Enough Oil Recovered During Service to the Industrial Refrigeration Plant

Only some of the oil was recovered using during the industrial refrigeration service of the plant. Therefore, the engineers decided to add new oil to get the chilled water system running. The only problem with doing this is that once running the machine, the oil has to be got back out. Therefore, the industrial refrigeration oil service had to be carried out a second time to resolve the oil return issue

0161 370 7193

service@maximuschillers.com

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Chilled Water System Repair by Fitting Fan Decks

For this chilled water system repair, scaffolding had been erected in accordance with the Risk Assessment. The old fan decks were lifted out by the two man team. A really good team was sent out: one of the men was more technical and the other more mechanical- complementing each other with their different skill sets. The new fans were an updated version and the wiring was different. The fault link had to be adapted but the 0-10v input from the controller was the same. The controller reads the pressure from a transducer, then sends out a voltage which the fan turns into the corresponding speed

Service Testing of the Chilled Water System

The fault link had been correctly modified, so service testing of the chilled water system was carried out. The machine loaded up to 62% and monitoring continued during the rest of the visit

Read More about International Institute of Ammonia Refrigeration Technology and Standards

 


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