Correct Instulation of TRV's W/Monoflows

John_32

I have a small cape house w/ a new buderious boiler and want to create either 1 or 2 zones using 1 pump w/monoflows and TRV's on each inlet to cast iron radiators. I also will being using an outside reset but was told to use a diff. pressure bypass(which I have no idea about) I also will have another zone for indirect DHW. Any help with this is greatly needed!!!

Ray Landry

TRV's and Monoflow systems

If you're going to install TRV's with monoflow you will need to be dead on with the amount of GPM's that the trv will allow to pass through it. The whole idea behind diverter tee systems is to create a pressure differential and force a certain amount of water into the radiator, while allowing the rest of the water to travel to the next radiator. If you choose a TRV with the wrong GPM's, it will not allow the water to travel into the radiator and a lack of heat or even no heat at all will occcur. If memory serves me from reading pumping away.. you're supposed to pick a TRV with a high flow rate to really pull the water up into the convector.

You would need a diff. pressure bypass becasue your system is designed with every radiatior open, but when TRV's satasfy and don't allow water into them, the volume of the system decreases and the pump that was designed to handle ALL the radiators is now choking through a smaller volume. THe bypass is installed to give the water some place to go when less radiators are calling for heat.

This isn't exactly a DIY'er kind of job, you might want to consider hiring a professional