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INSTALLATION GUIDE
CARE AND MAINTENANCE
TROUBLESHOOTING
Water leaks at fittings:
Slowly tighten until leak stops.
Water leaks persist:
Turn off water at the main water supply
shut-off valve. Remove threaded fittings.
Reapply Teflon
®
tape to the right and
screw fittings back onto head assembly.
CLEANING
The exterior of your filtration system
can be cleaned with warm, soapy water.
Rinse well with fresh, clean water.
Never use chemical cleaning products on
the system’s exterior surface as they may
damage the housing.
FILTER REPLACEMENT
We recommend you change the filter in the AO-WH-PREL system every three (3) or six
(6) months depending on your choice of filter. It should be replaced earlier if there is a
significant drop in water pressure.
TIPS
Before changing filter, turn off water supply. Place a bucket under filtration system to catch the small amount
of water that will run out after housing removal. If non-A. O. Smith brand filter is used, installer must ensure
the replacement filter is appropriate.
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AO-WH-PREL
The following range of A. O. Smith
filters can be used with this housing
AO-WH-PREL-R
AO-WH-PREL-RP
AO-WH-PREL-RC
AO-WH-PREL-RCP
AO-WH-PREL-RPP
A. O. Smith Corporation P.O. Box 1597 | Johnson City, TN 37605-1597 | 877.333.7108
1. Turn off the shut-off valves.
2. Relieve pressure in housing by pushing
the red pressure relief button.
3. Unscrew housing and remove old filter.
Wash housing thoroughly with mild
soap and water. Rinse thoroughly.
4. Insert new filter and re-install housing.
Ensure filter is centered and seated in the
housing before tightening onto head.
5. Hand-tighten housing onto cap until
snug. If necessary, use filter head
wrench to fully tighten the housing,
ensuring a watertight seal.
DO NOT OVER-TIGHTEN.
6. Turn on shut-off valves. If any leaks
appear, tighten housing as needed.
7. Flush system for five (5) minutes.
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