Im having some trouble with some newly istalled fan coil
units in cooling mode. With the units Trane provided piping
package pre assembled for hot h2o coil & chilled h2o coil.
It included a honeywell 3 way floating control valve &
actuator. The valve is a VC 6930 (special # for Trane I think) but same as VC6934. I have a low delta T of 7 on air
side (ra.72 sa 65) and the coil inlet is warmer (45F) than
coil outlet(39F). After confirming ch. water supply and
return wasnt backwards I started checking into the valve
and learned it can be piped 2 ways...diverting or mixing.
Mine are piped for mixing. My question is What is the
difference? when might mixing be perfered over diverting?
I dont recall ever seeing anything but diverting in my
limited experiance. Im guessing mixing might be better
if chilled water temp is extremely low
The heating valves & piping arrangement are exactly the
same but heat works ok and the inlet & outlet temps are
ok...the inlet being hotter. I did confirm Hot water not
flowing in cool mode.
Thanks for your replies and Ideas