Thornx
New Member
Hello,
Under 'Status Information' my NFC-175 displays a "5.Supply Temp", and a "6.Return Temp". Then further down it shows "7. Sys Supply Temp" and "8.Sys Return Temp" I understand the difference between Supply and Return Temperatures, but was curious about "System" temps....
I spoke with Navien support, and they said that 5 and 6 are from thermistors inside the machine. The 'system' temps (7 & 8) are the external sensors attached to the supply and return pipes respectively.
However, my Supply Temp (5) shows 134F, while the Sys Supply Temp (7) shows 123F. The return side is similar with Return Temp (6) showing 131F, and Sys Return Temp (8) showing 124F.
These numbers seem very odd to me. First, I would assume that both Supply temps and should be very similar if not exactly the same, as the sensors are not far from one another. Same with the Return side. Second, my Delta T is only a few degrees (which is another issue) but the thermistors show a DT of 3 degrees, while the return shows a Delta T of +1 degree - which is also odd.
Of course Navien Tech just said call a plumber.....
Any insights from you guys?
Under 'Status Information' my NFC-175 displays a "5.Supply Temp", and a "6.Return Temp". Then further down it shows "7. Sys Supply Temp" and "8.Sys Return Temp" I understand the difference between Supply and Return Temperatures, but was curious about "System" temps....
I spoke with Navien support, and they said that 5 and 6 are from thermistors inside the machine. The 'system' temps (7 & 8) are the external sensors attached to the supply and return pipes respectively.
However, my Supply Temp (5) shows 134F, while the Sys Supply Temp (7) shows 123F. The return side is similar with Return Temp (6) showing 131F, and Sys Return Temp (8) showing 124F.
These numbers seem very odd to me. First, I would assume that both Supply temps and should be very similar if not exactly the same, as the sensors are not far from one another. Same with the Return side. Second, my Delta T is only a few degrees (which is another issue) but the thermistors show a DT of 3 degrees, while the return shows a Delta T of +1 degree - which is also odd.
Of course Navien Tech just said call a plumber.....
Any insights from you guys?