R. L. DEPPMANN NEWS AND INFORMATION

Primary Secondary Piping

Primary Variable

Previously, the R. L. Deppmann Monday Morning Minutes looked at pump location in a primary-variable boiler heating system. We made a very definitive statement about... READ MORE

Expansion & Compression Tanks

Primary Variable Heating Systems: Should I Pump Into the Boiler or Out of It?

Norm Hall

April 11, 2022

Boilers

Primary Variable

Tanks

We recently received several calls for our recommendation on whether to pump into the boiler or out of the boiler in a primary variable heating... READ MORE

Minimum Flow in a Variable Speed Pump: A Great Example

Norm Hall

March 14, 2022

Cooling Towers

What is the minimum flow rate a variable speed pump can provide without damage to the pump? This is a question every engineer should ask... READ MORE

Condensing Boiler Temperature Reset for Increased Efficiency (Part 3 of 4)

Norm Hall

February 14, 2022

We are continuing with the series on Condensing Heating System Efficiency. Today, we are discussing condensing boiler temperature reset for increased efficiency. Hydronic condensing heating... READ MORE

Hydronic System Design – High Delta T Can Improve Boiler Efficiency (Part 2 of 4)

Norm Hall

February 7, 2022

How can you increase the operating efficiency of your condensing boiler heating system? This question was raised in the last R. L. Deppmann Monday Morning... READ MORE

Permanent Magnet (PMAC) Motors & Electrically Commutated (ECM) Motors in Hydronic Systems (Part 3 of 3)

Norm Hall

December 27, 2021

You understand the differences between premium efficiency (IE3) motors and PMAC or ECM motors (IE4&5). You understand the cost implications of both styles of motors.... READ MORE

Permanent Magnet (PMAC) Motors & Electronically Commutated (ECM) Motors in Hydronic Systems (Part 2 of 3)

Norm Hall

December 20, 2021

Can I and should I specify permanent magnet motors (PMAC) on my hydronic system pumps? The last R. L. Deppmann Monday Morning Minutes showed the... READ MORE

Expansion & Compression Tanks

Ice Rink Cooling System – Commissioning the Glycol Expansion Tank

Norm Hall

November 29, 2021

Cold Fill Pressures

Glycol & Water Quality

Tanks

A customer recently called us about an unusual occurrence in a closed hydronic cooling system for an ice rink. The system was filled using a... READ MORE

Constant Speed 2-Way Control vs. Variable Speed Pumps for Heating and Cooling Coils (Part 2)

Norm Hall

November 22, 2021

Primary Secondary

Primary Secondary Piping

Variable Speed

An engineer asked a question about using a variable speed pump for air temperature control in lieu of a two-way control valve. What are the... READ MORE

Constant Speed 2-Way Control vs. Variable Speed Pumps for Heating and Cooling Coils (Part 1)

Norm Hall

November 15, 2021

Primary Secondary

Primary Secondary Piping

Variable Speed

An engineer asked a question about using variable speed pumps for air temperature control in lieu of a two-way control valve. The question clearly makes you... READ MORE