Flow Rate Vs. Driving Pressure; Appendix A - Performance Monitoring; Service Assemblies - Pentair FRESHPOINT U440 Service Manual

TROUBLESHOOTING continued
Error Messages
Message
ERR1
ERR2

FLOW RATE VS. DRIVING PRESSURE

Figure 16 FreshPoint Flow Vs. Pressure Drop
NOTE: Curves are shown for a clean membrane at various
water temperatures.
NOTE: Flow decreases 3% for each 1.8F° (1C°) decrease in
feed water temperature.
APPENDIX A - PERFORMANCE
MONITORING
The consistency of performance of the ultrafilter membrane
can be assessed by measuring the transmembrane pressure
(TMP)*, filtrate flow rate, and water temperature and
comparing the results to the unit's previous performance.
Most beneficial is to have the data from when the membrane
was first installed for comparison.
Establishing Initial Conditions
1. If a flush tank has been installed, isolate it by closing the
ball valve.
2. Open the faucet closest to the FreshPoint system.
3. Record the filtrate flow rate as reported by the FreshPoint
controller as Finitial.
4. Record the pressure at the UF module inlet as Pinitial.
5. Record the known or estimated water temperature as
Tinitial.
Assess the current performance of the ultrafilter membrane by
normalizing its current performance to its initial performance
as follows:
6. If a flush tank has been installed, isolate it by closing the
ball valve.
7. Open the faucet closest to the FreshPoint system. This
should be the same faucet used during the initial testing.
8. Record the filtrate flow rate as reported by the FreshPoint
controller as Fcurrent.
Description
Service Volume or Service Days has expired
Communication error
Press the Extra Cycle button to clear. The
service volume and days will be reset.
Check dip switches and communication cable
connections and cycle power to controller. If a
multi-unit system, turn off power to all units,
correct cable or switch issues and restore
power first to slave unit(s), then to master
unit.
9. Record the pressure at the UF module inlet as Pcurrent.
10. Record the known or estimated water temperature as
Tcurrent. If the water temperature is assumed to not have
changed, this term of the equation will reduce to 1.
11. Calculate the current flow rate normalized to the initial
performance by the following equation:
Fnormalized = Fcurrent*[ Pinitial/ Pcurrent]*[1+(
Tinitial°F- Tcurrent°F)*0.017]
*TMP will be approximated by the inlet pressure, measured at the center ½" NPT
port in the bottom head, when a faucet near the UF system is opened.

SERVICE ASSEMBLIES

357707 .........................Stainless Steel Vessel Assy, U440
61595-03 .....................UF Filter Element Assy, 4"
41972 ...........................Bracket, Mounting, UF Filter
41976 ...........................Clamp Assy, UF Filter
4002963 .......................Timer, Service, U440, 24VDC
357716 .........................Fitting Kit, Inlet, U440
60700-10 .....................DLFC, ¾" F x ¾" F NPT, 10 gpm
4002792 .......................Fitting Kit, Outlet, U440
61823 ...........................Kit, 1" Turbine w/ ¾" NPT
4002793 .......................Fitting Kit, Drain, U440
4002607 .......................Solenoid Assy, U440, DC, Drain, NC
60699-70 .....................DLFC, ¾"F NPT, 7.0 gpm
357719 .........................UF Adapter Kit, 357707/61595
4002788 .......................Inlet Solenoid Kit, DC
4002786 .......................Outlet Solenoid Kit, DC
See FreshPoint Pricing Guide for complete list of service parts,
assemblies, and pricing.
Correction
FreshPoint U440 • 23