My 20 year old house has a functioning 5 zone system. Water returns from each zone controlled by a thermostat and is collected in a manifold. That water is then pumped by a single speed grundfos circulator pump through my 163 MBH burnham gas boiler to a hot water manifold that supplies the finned baseboard radiators. Between the two manifolds there is a bypass with a gate valve in the middle. Both manifolds and the bypass are 1.25” copper.
How should the bypass valve be set? Both mechanical contractors in my small town have had a look but neither has provided a good answer. Closed and open seem like wrong answers. There is no easy way to measure flow or pressure in the system other than the temp/pressure gauge coming out of the boiler. I need a simple answer to what I am sure is a difficult question. Slightly open? 1/3 open? Half?
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