When there is no hydronic pump discharge balance valve, the variable frequency drive (VFD) is an important part of the balance procedure. How does the …
Hydronic Pump Balance using the Variable Speed Drive (VFD) with Assistance from a Triple Duty Valve
Most centrifugal pumps in heating and cooling systems have some oversizing in the head calculation. Once the HVAC hydronic system is proportionally balanced per ASHRAE …
Variable Speed Hydronic Pump Selection – Should I Specify the Largest Impeller?
We recently received an inquiry from an engineering firm deciding whether to change their pump schedule. They currently select the pumps at design capacity and …
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 …
Permanent Magnet (PMAC) Motors & Electronically Commutated (ECM) Motors in Hydronic Systems (Part 1)
Hydronic system pumps and other HVAC and plumbing equipment will often have a variety of motor choices to specify. One of the newer additions to …
Hydronic System Centrifugal Pump Basics: Mechanical Seal Failure and Options
Hydronic and plumbing system pump service is one of the most popular seminars R. L. Deppmann offers for contractors and owners. Questions in these seminars …
Hydronic System Centrifugal Pump Trim: Inertia Bases
Vibration control is critical in all buildings for the comfort of the occupants. All rotating devices in the HVAC system cause vibration and pumps are …
Hydronic System Centrifugal Pump Trim: Check Valves
Check valves are extensively used on centrifugal pumps in hydronic heating and cooling systems. The technology being used is well over fifty years old. Today, …
Centrifugal Pump Readout for Contractors
The proper readout of a centrifugal pump in a hydronic system is important. Pump readout will determine the head pressure the pump is developing which …