Category : Chilled Water Systems
Always good to get out of the country to carry out global chilled water system service. 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.
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.
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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. The chiller did not stop when a test was carried out. I didn't want to valve off the water system 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. After several attempts of trimming I got the switch to settle down, then carried out tests to make sure it would not happen again.
Chilling Plant Service
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