Can anyone confirm port operation of the Termovar Mixing Valve that is stamped as 72 DegC. My understanding is that Port 3 is always open while Port 2 is completely closed until the sensed water temperature is greater than 160 DegF (72 DegF). Likewise, Port 1 is completely open until the water temperature is greater than 160 DegF. As the water temperature rises above 160 Deg F, Port 1 begins to close while Port 2 begins to open. Furthermore, Port 2 is completely open when the temperature reaches 172 DegF while Port 1 continues to close but never completely.
My questions are as follows:
(1) Is the theory of operation described above correct?
(2) Is it true that Port 2 does not open fully until the temperature is at 172 DegF? This seems high.
(3) Does Port 1 completely close or not? From what I have read this is never clear. If it does not close completely, how near closed is it?
(4) At what point does the Termovar sense the water temperature (i.e. at Port 1, Port 2, etc.)?
(5) Is operation of the Termovar reverse to what is described above when the measured temperature is falling?
This questions arises because I have measured the output of the boiler (with IR meter) when the Tx was 190 DegF and a particular zone calling for heat likewise just after the header was reading near 190 DegF (i.e. within 3 DegF).
Just a while ago, the temperature of the boiler outlet I measure at 168 DegF while the same zone calling for heat was only reading 154 DegF. I of course am wondering if the return port (Port 2) was partially closed and instead the majority of flow was being diverted back to boiler through Port 1. This is of course very detrimental to maintaing room temps on really cold nights as a wood load is near exhausted.
I had an earlier thread regarding discrepancies in Boiler output and header temperatures and still trying to make 100% sense of what I am observing
Thanks
My questions are as follows:
(1) Is the theory of operation described above correct?
(2) Is it true that Port 2 does not open fully until the temperature is at 172 DegF? This seems high.
(3) Does Port 1 completely close or not? From what I have read this is never clear. If it does not close completely, how near closed is it?
(4) At what point does the Termovar sense the water temperature (i.e. at Port 1, Port 2, etc.)?
(5) Is operation of the Termovar reverse to what is described above when the measured temperature is falling?
This questions arises because I have measured the output of the boiler (with IR meter) when the Tx was 190 DegF and a particular zone calling for heat likewise just after the header was reading near 190 DegF (i.e. within 3 DegF).
Just a while ago, the temperature of the boiler outlet I measure at 168 DegF while the same zone calling for heat was only reading 154 DegF. I of course am wondering if the return port (Port 2) was partially closed and instead the majority of flow was being diverted back to boiler through Port 1. This is of course very detrimental to maintaing room temps on really cold nights as a wood load is near exhausted.
I had an earlier thread regarding discrepancies in Boiler output and header temperatures and still trying to make 100% sense of what I am observing
Thanks