Monthly Archives: June 2019

Global chilled water system service near Saint Basil's Cathedral

Global Chilled Water System Service

Moscow Visit

Always good for our engineers to get out of the country to carry out global chilled water system service. He 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 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. Our engineer decided to tighten up the wiring and unplug, then plug all the connectors back in. When he ran the chiller again the problem went away.

Chilled Water System Global Service

As we provide a global service: we cannot get back the day after leaving site. Therefore, after resolving the above issue, our engineer 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, he put the whole of the plant back in Auto to prove it all together.

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Flow Switch Failure During Global Chilled Water System Service

Due to security issues, this one of the most remote plant rooms for a flow switch to fail. The chiller did not stop when a test was carried out. Our engineer didn't want to valve off the water system as the air handlers are old and 'dead heading' could cause failure. Instead he decided to use the Hand/ Off/ Auto switch for the pump. After several attempts of trimming he got the switch to settle down, then carried out tests to make sure it would not happen again.

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Chilled water system maintenance showing flow switch at 0 reading

Chilled Water System Maintenance

Maintenance of the Chilled Water System Flow Switch

The chilled water system flow switch requires regular maintenance due to a to build up of contaminants on the sensor. Over time, slime accumulates giving false readings. The problem is relatively easy to sort out: a wipe with a cloth.

Retrieving the sensor

The more difficult part is retrieving the sensor. It is fixed with a bolt into the water system. Therefore, there is pressure inside the water system. This pressure is handled and the glycol drained into vessels.

0161 370 7193

service@maximuschillers.com

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Checking the Fault Out Level

As you can see from the picture: there is a green light on 0. This indicates that the pump is off, not to be confused with pressure. With the pump on: the green lights go all the way up to 9 with the fault out level showing red on 7. Flickering between the numbers indicates that the flow rate is starting to drop off.

Maintaining the Chilled Water System Fault Out Level

Using a terminal driver and the manual that comes with the flow switch: the buttons can pressed a number of times to 'self test' Also, the fault out level can be set.

Testing the Flow Switch

The flow switch is manually tested using one of two methods. This ensures that the switch will function correctly when it needs to.

Maximus Chillers offers the whole package for the maintenance of your plant. With state of the art equipment and the best engineers- we complete the picture. Weather you have a small problem like the above mentioned flow switch, or a big problem like compressor failure- Maximus Chillers can help.

Any Chiller- Any Problem- Any Part- Any Refrigerant- Anywhere- The MAXIMUS ADVANTAGE™

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Read more about flow measurement on Wikipedia.


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