The scenario
A boiler room serving zoned hydronic heating and an indirect domestic water heater requires a P&ID showing the boiler loop, zone supply, and temperature control.
What is in this drawing
Read the decisions behind it.
01
Primary loop with boiler circulator and isolation valve to indirect tank
02
Three-way mixing valve controlled by supply temperature transmitter/controller
03
Zone circulator delivers supply to terminal units with return to boiler
Use for condensing boiler installations with indirect DHW tanks and multiple heating zones.
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