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Articles by John Siegenthaler, P.E.

John Siegenthaler: How to wire fresh air dampers

The 2018 version of NFPA 54 prescribes methods for providing this air into confined spaces using one or two openings to outside space.

John Siegenthaler, P.E.

March 27, 2018

A simple circuit to coordinate fresh air dampers.

One change to get it right

The Glitch & Fix: February 2018

John Siegenthaler, P.E.

February 26, 2018

One Chance to Get It Right

John Siegenthaler: Tell me more about 'nubbed' foam panels

John Siegenthaler, P.E.

February 26, 2018

Designers need more information on “nubbed” foam insulation panels.

Siegenthaler: There's no such thing as 'head pressure'

John Siegenthaler, P.E.

January 30, 2018

Anyone who has worked on the technical side of the hydronics industry has used terminology such as: pressure, differential pressure, head and head loss. These terms all have legitimate and specific meanings.

The Glitch figure 1

The Glitch & Fix: January 2018

John Siegenthaler, P.E.

January 30, 2018

John Pughe is a long-time colleague of mine and a true hydronics professional. He recently sent me an “as installed” and “as corrected” schematic for a hydronic heating system with twin 200,000 Btu/hr mod/con boilers, and 15 zones, each powered by its own circulator.

The Glitch

The Glitch & Fix: Underused Functionality

The Glitch & Fix: December 2017

John Siegenthaler, P.E.

December 30, 2017

Can you spot several details that will lead to problems? How would you design the system differently?

Back to hydronics basics

John Siegenthaler, P.E.

December 30, 2017

A knowledge of basic science reveals situations that seem too good to be true.

Myths and methods for protecting boilers against flue gas condensation.

John Siegenthaler, P.E.

November 27, 2017

Stay above the dew point.

John Siegenthaler: Renewable Heating Design

Details for bypassing thermal storage

Backflow-prevention devices guard fire protection water entering potable supply.

John Siegenthaler, P.E.

October 24, 2017

Through and around.

The Glitch: Can you identify, describe, and propose a fix for several problems that are likely to develop with this system

Level-headed

John Siegenthaler, P.E.

October 24, 2017

An unpressurized outdoor wood-fired heater is installed to supply heat to fin-tube baseboard install in a two-story home.

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