Blog Locate a Wholesaler Careers Contact R. L. DEPPMANN NEWS AND INFORMATION Monday Morning Minutes Service Tip of the Month Announcements Constant Speed 2-Way Control vs. Variable Speed Pumps for Heating and Cooling Coils (Part 2) NORM HALL NOVEMBER 22, 2021 HYDRONIC DESIGN, MONDAY MORNING MINUTES, PRIMARY SECONDARY, PRIMARY SECONDARY PIPING, PUMPS, VARIABLE SPEED An engineer asked a question about using a variable speed pump for air temperature control in lieu of a two-way control valve. What are the … Read More CONSTANT SPEED PUMPING HEATING AND COOLING COILS PRIMARY-SECONDARY PIPING VARIABLE SPEED PUMPING Constant Speed 2-Way Control vs. Variable Speed Pumps for Heating and Cooling Coils (Part 1) NORM HALL NOVEMBER 15, 2021 HYDRONIC DESIGN, MONDAY MORNING MINUTES, PRIMARY SECONDARY, PRIMARY SECONDARY PIPING, PUMPS, VARIABLE SPEED An engineer asked a question about using variable speed pumps for air temperature control in lieu of a two-way control valve. The question clearly makes you … Read More CONSTANT SPEED PUMPING HEATING AND COOLING COILS PRIMARY-SECONDARY PIPING VARIABLE SPEED PUMPING Hydronic Primary-Secondary Piping – How Important are the Two Close Tees? NORM HALL NOVEMBER 8, 2021 HYDRONIC DESIGN, MONDAY MORNING MINUTES, PRIMARY SECONDARY, PRIMARY SECONDARY PIPING, PUMPS, VARIABLE SPEED Every year we get questions about the importance of primary-secondary piping rules around boilers and coils. Recently, I also received a call about using a … Read More HYDRONIC PIPING PRIMARY-SECONDARY HYDRONIC PIPING PRIMARY-SECONDARY PIPING SECOND AFFINITY LAW Solving Minimum Flow in a Primary Variable System (Part 3) NORM HALL OCTOBER 11, 2021 HYDRONIC DESIGN, MONDAY MORNING MINUTES, PIPING AND INSTALLATION, PRIMARY VARIABLE, PUMPS, SELECTION & SPECIFICATION, VARIABLE SPEED The engineer is aware of the importance of minimum flow to the pumps in hydronic systems. The R. L. Deppmann Monday Morning Minutes Part 1 … Read More BYPASS CONTROL VALVE CONSTANT FLOW BYPASS HYDRONIC SYSTEMS PRESSURE DIFFERENTIAL BYPASS VALVE PRIMARY VARIABLE SYSTEMS Minimum Flow in Variable Speed Pumps for Building Hydronic HVAC Systems (Part 2) NORM HALL OCTOBER 4, 2021 HYDRONIC DESIGN, MONDAY MORNING MINUTES, PIPING AND INSTALLATION, PRIMARY VARIABLE, PUMPS, SELECTION & SPECIFICATION, VARIABLE SPEED The HVAC engineer designing a hydronic system understands the need to protect the circulating pumps from a dead head or no flow condition. This week, … Read More HYDRONIC HEATING AND COOLING SYSTEMS MINIMUM FLOW REQUIREMENTS PRIMARY SECONDARY SYSTEM VARIABLE PRIMARY SYSTEMS Minimum Flow in Variable Speed Pumps for Building Hydronic HVAC Systems (Part 1) NORM HALL SEPTEMBER 27, 2021 HYDRONIC DESIGN, MONDAY MORNING MINUTES, PIPING AND INSTALLATION, PRIMARY VARIABLE, PUMPS, SELECTION & SPECIFICATION, VARIABLE SPEED Every week a question comes into R. L. Deppmann about the minimum flow rate through hydronic pumps and the best way to achieve it. Today, … Read More FLOW RATE OF A HYDRONIC PUMP FLOW RATE REQUIREMENTS HYDRONIC PUMP HYDRONIC SYSTEMS MINIMUM FLOW RATES Variable Speed Hydronic Pump Selection – Should I Specify the Largest Impeller? NORM HALL JULY 12, 2021 MONDAY MORNING MINUTES, OPERATING COST & ENERGY, PUMPS, VARIABLE SPEED 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 … Read More BELL AND GOSSETT COST ENERGY EFFICIENCY HVAC HYDRONIC SYSTEM IMPELLER TRIMMING IMPELLERS AND SPEED PUMP VARIABLE SPEED A Mobile App for Domestic Hot Water Recirc. & Residential Circulators NORM HALL JULY 5, 2021 ECM, MONDAY MORNING MINUTES, VARIABLE SPEED Someday, there will be a mobile app that can provide a warning when your domestic water and/or residential heating pumps stop working. For smaller gallon … Read More BELL & GOSSETT ECOCIRC XL ECM CIRCULATOR PUMP BELL AND GOSSETT DOMESTIC RECIRCULATION DOMESTIC WATER BALANCE HVAC HYDRONIC SYSTEM HYDRONIC HEATING SYSTEMS MOBILE APP PUMPS Variable Speed Chilled Water Systems: Demand Reset NORM HALL JUNE 21, 2021 ASHRAE 90.1, CODES & STANDARDS, MICHIGAN ENERGY CODE, MONDAY MORNING MINUTES, VARIABLE SPEED There are multiple methods to vary pump speed in HVAC chilled water systems. A common method is the use of a differential pressure transmitter at … Read More ASHRAE ENERGY STANDARD 90.1 BELL AND GOSSETT CHILLED WATER SYSTEMS DEMAND RESET DIFFERENTIAL PRESSURE SENSOR HVAC SYSTEMS MICHIGAN ENERGY CODE OHIO ENERGY CODE VARIABLE SPEED XYLEM Energy Savings Using Variable Speed Water Pumps on Constant Flow Condensers NORM HALL AUGUST 30, 2020 BALANCING, CONTROLS, COOLING TOWER, COOLING TOWERS, MONDAY MORNING MINUTES, PIPING & PUMPS, PUMPS, VALVES, VARIABLE SPEED, VARIABLE SPEED PUMPS When using multiple parallel condensers with constant speed pumps, the flow rate at part load may be excessive and problematic. Our last blog on this … Read More CONDENSER PUMPS CONDENSER WATER LOAD CONSTANT FLOW CONDENSER PUMPS SINGLE PUMP OPERATION 1 2 3 ... 4 → About Us Providing quality products and outstanding service to customers in Northern Ohio & Michigan since 1927. 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