Hydronic Heat Pump circulator with integral check valve
Glycol fill tank: 25%-50% propylene glycol throughout system. Alternatively, a flat plate
heat exchanger or heat pump indirect tank can isolate glycol from distribution water (see
previous figures).
Buffer tank.
Buffer tank hydraulically separates HPX from load piping; load pump(s) sized for head
loss of building side of tank only. Buffer tank needs vacuum breaker for cooling mode.
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