Most hydronic heating and chilled water systems end up with one operating pump and one 100% standby pump. It is easy to understand, and the …
HVAC Hydronic System Variable Speed Pump Operation
I am beginning a series on parallel staged variable speed (VS) pumps. As I write this series, it is important to understand and refer to …
HVAC Hydronic Pumps – Should I Trim the Impeller or Trim with Speed? (Part 2 of 2)
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 …
HVAC Hydronic Pumps – Should I Trim the Impeller or Trim with Speed? (Part 1 of 2)
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 …
Bock Opti-therm Water Heater Installation
Important installation instructions are commonly missed when installing Bock Opti-therm water heaters. The end of this article also shows a few periodic maintenance items that …
Hydronic Cold Fill Makeup Valve: Keep it Open or Closed?
The cold fill pressure setting in a closed hydronic heating or cooling system is still one of the key problems uncovered when our customer service …
Expansion Tank Air Side Maintenance Schedule
I recently visited a school mechanical room and was asked about the relationship between the makeup pressure reducing valve setting and the expansion tank pressure …
Top Workplaces Achievement – 2 years in a row!
For the second year in a row, we are proud to announce that the R.L. Deppmann Company has been named a 2019 Top Workplace Award …
Centrifugal Pump Gauge Readout: Adjustments to Balancing for Glycol Temperature
Glycol correction factors were the subject of many of the last few R. L. Deppmann Monday Morning Minutes. While writing these articles, I thought about …
Rebates, Rebates, Rebates
Equipment Efficiency Upgrades Incentives In Michigan and Ohio, both electric and gas utilities are offering rebates for building HVAC equipment efficiency upgrades as well as …