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New York City wasted no time adopting portions of the recently published Standard 188-2015, Legionellosis: Risk Management for Building Water Systems. This is following the recent outbreak of...
Read MoreWhy has ASHRAE decided to address balancing in a standard that is written for the purpose of Legionella prevention? The reason has to do with domestic hot water recirculation systems – particularly large systems with multiple returns coming back to the boiler. If these return lines are not balanced it is possible that...
Read MoreBalancing isn’t just about adjusting valves. Sometimes (very often in fact) it is about evaluating the performance of the pump(s) under real world operating conditions. Remember what ASHRAE 90.1 has to say about Hydronic System Balancing: “Hydronic systems shall be proportionately balanced in a manner to first minimizethrottling losses; then the pump impeller shall be trimmed or pump speed shall be adjusted to meet...
Read MoreBalancing contractors and facility operators would have a much easier time balancing a hydronic system if they were present during the system design process. Unfortunately that is rarely the case so there is usually a certain amount of detective work that comes with balancing. The biggest part of that is getting a handle on the overall pumping system. You can’t effectively balance a system without understanding...
Read MoreThere are multiple choices for creating a balanced hydronic system. Here is a list of the most commonly used devices.
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