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Plumber reversed the hot and cold lines during installation

My plumber reversed the hot and cold lines during installation of Amst.R110 rough valve.
Can the cartridge be reversed?

Thanks Fred

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Yes it can but I believe only the Pressure Balance Unit needs reversed.

1) Turn off water supply to unit
2) Remove handle/trim if installed
3) Remove cartridge by removing 3 screws holding cartridge
4) Remove retainer ring holding in P.B.U. in valve body by removing 3 screws
5) Remove Pressure Balance Unit, rotate 180ﹾ and reinsert
6) Reassemble in reverse order

Posted on Dec 31, 2008

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Will reversing the hot and cold lines prevent hot water flow when moving lever in opposite direction from normal?


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The hot and cold are reversed on our single handle shower (no tub faucet -- shower only)


Hot on left.
Cold on right.
Some single handle faucets have bleed-over where both hot and cold enter mixing valve each time handle is turned on, even when faucet calls for just cold or just hot.
Otherwise maybe a do-it-yourself plumber got pipes backwards... or maybe the tub used to be on other side of wall, and tub was moved during remodeling but pipes were not changed.

To fix problem:
First of all, turn off shower faucet. Turn on Hot at sink and put ear against shower faucet listening for sound of water flowing through the mixing valve.
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I just installed a Moen shower valve Model 82910cbn. The cold water supply is on. The shower works when the cold and hot water is going to the valve, but when I turn off the cold water supply going into...


This is taken from the Moen manual. You can download it here:
http://www.moen.com/shared/pdf/instruction_sheets/ins162e.pdf
Balance Spool Maintenance
The precise and instantaneous pressure control illustrated has been
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During construction or valve installation, foreign material such as solder
flux, pipe cuttings sand, dirt or wood is unavoidably introduced into the
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2. If the valve still does not function properly, turn off both the hot and
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screwdriver. The inner piston of the balancing spool should shake
back and forth freely. If this is not the case, jar the spool on either
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