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Centrifugal Pumps: Determining Flow Rate Using Amp Readings

Norm Hall January 23, 2023 Commissioning and Balance, Commissioning and Balance, Monday Morning Minutes, Motors, Pumps, Pumps

We understand that the best way to determine the flow rate of an operating pump is the proper readout of gauges attached to the pump …

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amp readingscentrifugal pumpsflow ratePumps
hydronic pump
hydronic pump

Create a New Variable Speed Pump Control Curve after Hydronic Balancing

Norm Hall June 29, 2020 Commissioning and Balance, Commissioning and Balance, Monday Morning Minutes, Pumps, Pumps, Variable Speed

This week, the R. L. Deppmann Monday Morning Minutes will explain how to show multiple speeds on a pump curve and how to determine what …

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hydronic pump
hydronic pump

Hydronic Pump Balance using the Variable Speed Drive (VFD) with No Balance Valve on Pump

Norm Hall June 22, 2020 Commissioning and Balance, Commissioning and Balance, Monday Morning Minutes, Pumps, Pumps, Variable Speed

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 …

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Hydronic Pump Balance using the Variable Speed Drive (VFD) with Assistance from a Triple Duty Valve

Norm Hall June 15, 2020 Commissioning and Balance, Commissioning and Balance, Monday Morning Minutes, Pumps, Pumps, Variable Speed

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 …

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tower system
tower system

Open Cooling Tower System Pumps – Balancing the Pump Using a Drive

Norm Hall June 8, 2020 Commissioning and Balance, Commissioning and Balance, Monday Morning Minutes, Pumps, Pumps, Variable Speed

Open cooling tower pumps are traditionally operated as constant speed. When balanced, the extra pump head or over-heading is throttled across the discharge balance valve …

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Balancing & Trimming Hydronic Constant Speed Pumps

Norm Hall June 1, 2020 Commissioning and Balance, Commissioning and Balance, Monday Morning Minutes, Pumps, Pumps

The HVAC hydronic system is proportionally balanced per ASHRAE 90.1 energy standards. The proportional balance, when properly completed, will result in all the extra pump …

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circuit setter balance valve
circuit setter balance valve

Hydronic Pump Energy Savings and Proportional Balancing Technique

Norm Hall May 25, 2020 Commissioning and Balance, Commissioning and Balance, Monday Morning Minutes, Proportional, Pumps

ASHRAE Energy Standard 90.1 indicates the hydronic system shall have proportional balance and the pump over-heading shall be removed through speed reduction or impeller trimming. …

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pump
pump

Process System Pump Selection: Controls to Reduce Maintenance Time

Norm Hall May 4, 2020 Commissioning and Balance, Constant Speed, Monday Morning Minutes, Pumps, Troubleshooting, Troubleshooting

In the last R. L. Deppmann Monday Morning Minutes I defined the difference between flat curves and steep curves in a hydronic pump selection. I …

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Hydronic Pump Impeller
Hydronic Pump Impeller

HVAC Hydronic Pumps – Should I Trim the Impeller or Trim with Speed? (Part 2 of 2)

Norm Hall December 9, 2019 Commissioning and Balance, Monday Morning Minutes, Pumps, Pumps, Test and Balance, Variable Speed

In the last R. L. Deppmann Monday Morning Minutes, I offered a couple of reasons why an engineer would schedule a larger impeller than needed …

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Hydronic Pump Impeller
Hydronic Pump Impeller

HVAC Hydronic Pumps – Should I Trim the Impeller or Trim with Speed? (Part 1 of 2)

Norm Hall December 2, 2019 Commissioning and Balance, Monday Morning Minutes, Pumps, Pumps, Test and Balance, Variable Speed

Engineers schedule a pump capacity in GPM and head along with the horsepower. The pump manufacturer traditionally trims the impeller from the maximum size, also …

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Providing quality products and outstanding service to customers in Northern Ohio & Michigan since 1927.
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  • Products
    • Overview
    • Pumps and Accessories
    • Boilers and Water Heaters
    • Hydronic Systems
    • Plumbing Systems
    • Steam and Condensate
    • Variable Frequency Drives (VFDs)
    • Glycol Installation
    • Snowmelt Designs
  • System Design
    • Overview
    • Project Gallery
    • Selection and Design Tools
  • Contractors
  • Service & Parts
    • Overview
    • Startup and Warranty
    • Parts
    • Service and Maintenance
  • Education
    • Overview
    • Training Opportunities
    • Factory Classes
  • About RLD
    • Overview
    • Team Deppmann
    • R.L. Deppmann Locations
    • Careers
    • Community Engagement
    • Press and News