Carbon reduction in building design is critical to the lifestyle of our future generations. Most engineers and their owner clients understand the concerns and welcome …
What is a Flexible Tube Condensing Boiler? Why My Client May Want It
Heating and cooling service contractors take the brunt of complaints over the high cost of condensing boiler repairs. A high efficiency condensing boiler heat exchanger …
Circulator Pump Curves & Step Sized Selections. A Domestic Water Recirculation Example
Circulator series pumps are those small inline pumps that have fixed impeller choices with no impeller trimming available. When these pumps have ECM technology, the …
Primary-Secondary Variable Heating Systems: Should I Pump Into the Boiler or away from It?
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 …
Primary Variable Heating Systems: Should I Pump Into the Boiler or Out of It?
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 …
Condensing Boiler Venting Material (Part 1)
Proper venting of hydronic condensing boilers is critical for the safety of occupants and the successful operation of the heating plant. The materials that may …
Minimum Flow in a Variable Speed Pump: A Great Example
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 …
Condensing Boiler Staging & Dual Return for Higher Efficiency (Part 4 of 4)
An engineer uses larger temperature differences and deep reset when designing a condensing hydronic heating system. The design may utilize staging of multiple boilers in …
Permanent Magnet (PMAC) Motors & Electrically Commutated (ECM) Motors in Hydronic Systems (Part 3 of 3)
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. …
Permanent Magnet (PMAC) Motors & Electronically Commutated (ECM) Motors in Hydronic Systems (Part 2 of 3)
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 …