Global Chilled Water System Service

Chilled Water System Service near Saint Basil's Cathedral

Global Chilled Water System Service

Moscow Visit

Always good to get out of the country to carry out chilled water system service around the globe. Just had a little free time this visit to see Red Square and Saint Basil's Cathedral. Most of the visit was bogged down resolving issues

Electrical Problems

One of the water cooled chillers was pumping down due to electrical problems. One of the solenoids for the evaporator was not opening. All checked out okay with the solenoid coil and valve. Following the wiring diagram lead to the relay board. The relay board is responsible to run various components around the compressor. It was not obviously blown and there were no dry soldered joints on the back. I decided to tighten up the wiring and unplug, then plug all the connectors back in. When I ran the chiller again the problem went away

Chilled Water System Global Service

As we provide a global service for chilled water systems: we cannot get back the day after leaving site. Therefore, after resolving the above issue, I ran the system in local with some of the other systems off to prove it. All was okay. After completing the rest of the service on the chillers I put the whole of the plant back in Auto to prove it all together

0161 370 7193

service@maximuschillers.com

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Flow Switch Failure During Global Chilled Water System Service

The flow switch failed in one of the most remote plant rooms in the globe for chilled water system service. This is due to security issues. As one of the service checks- I tried to trip the chiller on flow fail. The chiller did not stop. I didn't want to valve off the water system repeatedly as the air handlers are old and 'dead heading' could cause failure. Instead I decided to use the Hand/ Off/ Auto switch for the pump. There are two adjusting screws on the flow switch. After several attempts I got it to settle down, then carried out tests to make sure it would not happen again

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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


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