Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.
One zone not circulating in a multi-zone system

pavehydro
Member Posts: 2
I have a 4-zone radiant system with a high efficiency water heater as my heat source and 4 Grundfos UP(S)-15 pumps. Sometimes the system works great. Other times one or more of the zones does not circulate the water. I notice this most when two or more pumps come on at once (example if the power goes then comes on a while later or if two zones kick on at the same time as normal based on thermostat settings). All air is removed and I've confirmed its not air-bound. If I open the garden hose valve on the return side briefly (3 to 5 seconds), the zones begin to flow normally. I am not sure what to do to fix my circulation issue. Install a pump on the main return line maybe? Also, there are three settings on the pumps. I have no idea what to set these at or if they are correct since the system was installed before I bought the house recently. The radiant system is only two or three years old.
0
Comments
-
I've drawn a rough sketch of the system in my cellar.
0
Categories
- All Categories
- 86.9K THE MAIN WALL
- 3.2K A-C, Heat Pumps & Refrigeration
- 57 Biomass
- 425 Carbon Monoxide Awareness
- 109 Chimneys & Flues
- 2.1K Domestic Hot Water
- 5.7K Gas Heating
- 105 Geothermal
- 160 Indoor-Air Quality
- 3.6K Oil Heating
- 70 Pipe Deterioration
- 975 Plumbing
- 6.3K Radiant Heating
- 386 Solar
- 15.4K Strictly Steam
- 3.4K Thermostats and Controls
- 54 Water Quality
- 44 Industry Classes
- 47 Job Opportunities
- 17 Recall Announcements