When we show variable speed pump curves, we also want to show the control curve. This control curve looks very similar to a system curve …
Converting Constant Speed Pumps To Variable Speed – End Of Curve Concerns
In the R. L. Deppmann Monday Morning Minute from June 4th we offered some tips on converting an existing over-headed constant speed pumping system to a …
Pump Selection Criteria: Maximum Point on the Curve
How many times have you, as an engineer, looked at a number of pump curves and passed up a few because you did not like …
HVAC Hydronic Pumps: Impeller Trimming with a Drive (VFD)
In the last R. L. Deppmann Monday Morning Minute we covered the use of a B&G Triple Duty Valve to set the maximum speed in …
HVAC Hydronic Pumps: B&G Triple Duty Valve for Proportional Balance
The ASHRAE Standard 90.1-2013 and the State of Michigan 2015 Energy Code both require the trimming of impellers or reduction in the maximum speed when …
Smart ECM Pump Applications – Variable Speed Heating & Cooling System
ECM (Electronically Commutated Motor) pumps have electronics built into them which may be used to vary the speed of the pump. If the pump manufacturer …
Adjusting a Variable Frequency Drive (VFD) to Over Speed a HVAC Centrifugal Pump
The R. L. Deppmann Monday Morning Minutes from a few weeks ago discussed the option of a small amount of over speeding on B&G pumps …
How to Pick a HVAC Centrifugal Pump Part 10: Over speed a HVAC Pump using a VFD
The last R L Deppmann Monday Morning Minutes described the recommended limitations when over speeding a HVAC pump with a VFD. Today we will show …
How to Pick an HVAC Centrifugal Pump Part 9: Over speeding HVAC Pumps & Motors
There are times when slightly more capacity or a little more safety factor is needed from a pump selection. Often times we are asked about …
How to Pick an HVAC Centrifugal Pump Part 8: Motors for HVAC Centrifugal Pumps (Continued)
Motor speed for HVAC centrifugal pumps is a hot topic these days. Last week the R. L. Deppmann Monday Morning Minutes (MMM) began exploring motors …