The Glitch + The Fix: Diagnosing an insufficient heat complaint
Figure 1 is photo sent to me for a “diagnosis.” It shows part of a floor heating system in a commercial building located in a cold climate. The manifold station serves eight circuits of 5/8” PEX tubing. The copper piping supplying the manifold station is 3/4” size. Water temperature to the supply manifold is regulated by a thermostatic mixing valve. There’s a flo-check valve at the top of the copper piping assembly. Flow appears to be created by a small zone circulator. The insulated horizontal piping makes a “U-turn” just to the left of the risers from the floor circuits.