Controls and mixing valve layout for radiant floor heat (added to radiators)

Heating · Distribution Systems · printed page 156 (PDF page 157)

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Controls and Mixing Valve Layout for Radiant Floor Heat Radiant Heat – Controls and Mixing Valves

Text in the illustration

Controls and mixing valve layout for radiant floor heat (added to radiators)
return from radiators
150°F
radiators
boiler
pump
check valve
mixing valve
120°F
radiant floor heat
simplified for clarity

Generated explanation

This schematic shows a boiler serving radiators with an added radiant floor heating circuit. The radiator supply is labeled 150°F, while a mixing valve combines boiler supply water with cooler return water to provide a 120°F supply to the floor circuit. A check valve and pump are installed downstream of the mixing valve before the serpentine radiant floor tubing. Red and blue piping and directional arrows identify the supply and return flow paths, with the floor return connected back to the boiler and to the mixing valve. The layout is explicitly simplified for clarity and depicts no identified defects.

Components

boiler radiator supply piping radiator return piping radiant floor heating tubing mixing valve check valve circulator pump return piping expansion tank boiler flue