The Glitch & The Fix

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Can you identify at least four errors in this design?

Given all the recent interest in solar domestic water heating, Joe Wrenchturner decides to have a go at it.

A manually set three-way mixing valve was installed to regulate the supply temperature to the concrete-slab radiant floor system.

A heating contractor, who’s tired of coaxing 500-pound cast-iron boilers into homes, decides to try out a wall-mounted mod/con boiler because of its light weight and side wall venting.

The installer feels that a mix of primary/secondary piping along with some “alternative techniques” is appropriate.

As part of an extensive renovation and insulation upgrade, the owner decides to upgrade the heat and convert the 2-pipe steam system to hot water.

An installer is advised to use a buffer tank to prevent short cycling of a low mass boiler serving several independently controlled space heating zones ...

An installer is asked if a geothermal heat pump can be combined with radiant floor heating.

The installer got a great price on a “contractor pack” of 3/4-inch copper tees, so the supply and return manifolds are built with 3/4-inch copper, as are all the zone circuits ...

Here’s an extremely messed up installation for you to ponder.