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 …
Centrifugal Pump Gauge Readout Corrections for Hydronic Glycol Systems
Ask any test/balance or service technician in the hydronic HVAC world to convert PSIG to feet of head and the multiplier of 2.31 is the …
Troubleshooting & Cleaning a DriSteem Humidifier Probe Assembly
If you have a DriSteem steam humidifier (including the Vaporstream, Vapormist or GTS model operating on standard softened or potable water) you need to periodically …
Centrifugal Pump Gauge Readout Corrections-Velocity Head Corrections
We recently had an inquiry from an engineer who was concerned about pump operation compared with the submitted pump curve. It appeared from the balance …