Norm Hall
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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
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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
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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
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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
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Every year we get questions about the importance of primary-secondary piping rules around boilers and coils. Recently, I also received a call about using a... READ MORE
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Solving Minimum Flow in a Primary Variable System (Part 3)
Norm Hall
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October 11, 2021
The engineer is aware of the importance of minimum flow to the pumps in hydronic systems. The R. L. Deppmann Monday Morning Minutes Part 1... READ MORE
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The HVAC engineer designing a hydronic system understands the need to protect the circulating pumps from a dead head or no flow condition. This week,... READ MORE
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Variable Speed Chilled Water Systems: Demand Reset
Norm Hall
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June 21, 2021
There are multiple methods to vary pump speed in HVAC chilled water systems. A common method is the use of a differential pressure transmitter at... READ MORE
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Cooling Tower Spring Startup Tips
Norm Hall
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April 19, 2021
The weather is warming, and our attention turns away from heating and toward system air conditioning. To protect the cooling tower pumps, we offer a... READ MORE
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Tis’ the Season to Start Your Air-Cooled Chillers
Norm Hall
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April 12, 2021
Many air-cooled chillers do not have glycol and are drained for the winter season. Most cooling towers are also drained for our cold winter months.... READ MORE
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