Chilled water system EEV service was being carried out because the mechanical parts had failed. This particular valve is prone to this fault. It is an OEM electronic expansion valve, so our technician found the voltage for the motor and found a similar part with the same amount of steps.
The EEV driver was found to be functioning satisfactorily. Sometimes, depending on how the mechanical part of the EEV has failed, the driver 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 valve has burned out the motor 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.
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Pump Down for Chilled Water System EEV Service
The chiller was pumped down and valved off. 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 its 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.
Restart after Chilled Water System EEV Service
After leak testing, the refrigerant system valves were opened back up and the plant switched back on. The correct superheat and subcooling values were achieved concluding a successful visit.
Chilling Plant Service
Read about Danfoss electronic expansion valves