Hydrotech FreshPoint U440 Ultrafiltration System - Manual (Page 20)

Page 20
NOTE: Test the system first for plumbing leaks by closing the downstream faucet and/or connecting
the outlet union, and performing steps 11 through 13. Pressure decay with outlet plumbing closed
indicates a leak in the plumbing or valves, and the plumbing connections should be tightened or
replaced and the system retested until the plumbing passes. In the event a drain solenoid is leaking,
actuating a flush a few times may cause it to seat. If not, it should be replaced.
Turn on the air compressor.
With the drain solenoid valve closed, carefully pressurize the feed side (the inside of the fiber lumens) to 15.1
psig to 15.4 psig by pressing the air compressor hose chuck onto the air supply valve on the Technician’s
Decay Test Components, Figure 7. DO NOT PERMIT THE MODULE TO BE PRESSURIZED TO GREATER
THAN 16 PSIG.
Turn off the air compressor.
Begin timing the pressure decay when the pressure falls to 15.0 psig.
Record the pressures at 30, 60, 90, and 120 seconds.
Once the plumbing has passed the test, test the membrane and membrane seals by opening the nearest
downstream faucet to allow air to escape during the test, or crack open the outlet union.
NOTE: A membrane that is not properly wet-out or has been sitting for some time may cause a false
failure. Ensure that the membrane has been flushed properly before performing the Integrity Test.
Acceptance Criteria: After two minutes, the system should not have decayed from 15.0 psig to less than
14.5 psig.
If the system fails to hold pressure, replace the membranes and/or seals.
When the testing is complete, depressurize the modules by pressing the valve core in the air supply valve on
the Technician’s Decay Test Components, and by pressing the Extra Cycle button.
Close the ¼” valve at the bottom of the module.
10.
11.
12.
13.
14.
15.
16.
17.
18.
Installation Instructions
Figure 7: Technician’s Decay Test Assembly
Air Compressor
Quick-Disconnect Fitting
0.2 Micron Air Filter
Shut-Off Valve
Tee
Pressure Gage
Air Fill Valve
42613_REVA