Hi is there anyone that can help with the following:
The site i'm on has a chiller system, 2x Carrier 30RH 12.5KW which supplies 4x Trane Fan Coil Units 2.5KW in ticket kiosks which are all piped in parallel. The Fan coil units have only a three port valve on them. The problem that we are experiencing is that the last ticket booth on the run isn't acheiving temperatures which are as low as the other kiosks. the supply temp on the flow is 14C and the return is 18C which I feel would indicate a load? However, the supply air temp is only 19C whereas, in the other booths the temperatures on the supply air are about 14C.
We have isolated the supply checked the flow pressure, checked correct operation of the three port valve, bled the coil and cleaned sediment from the system but, with no change in temperatures.
We have had someone out and they suggested another pump on the system, but when I explained the above to them and asked if a pump would solve the problem they said "maybe". (not very convincing). The Pressure and flow seem ok and there are no additions to the system so surely it would hve been set up correctly in the first place and there would be no need for an extra pump?
Can anyone give any suggestions or solutions to the problem of no flow, I would really appreciate any advice or suggestions. Many thanks.