What are the typical O&M procedures for run-around glycol loops? Are there particular design strategies to minimize O&M requirements?
A. The O&M is typical to any hydronic and coil system – glycol needs to be annually checked and periodically replaced, pumps need minimal maintenance, system performance needs to be checked and optimized, and coils need to be cleaned if pressure drop starts to increase across coils. Filters should be installed before supply and exhaust coils. If corrosive conditions are expected use a coil coating to minimize corrosion on the exhaust coil. The filters can be low efficiency – they are there mostly to catch things like wipes that get sucked into the exhaust system. Be sure to design to allow filer replacement without having to enter the exhaust stream.
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