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How to Adjust the Temperature Limit Stop on a Moentrol with Integrated Transfer Valve

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The article will explain how to adjust the maximum water temperature produced by a two handle 3320, 3330 or 3350 Moentrol with Integrated Transfer Valve shower system by modifying the 104249 limit stop. Moen recommends limiting the maximum temperature flowing from the shower to 120°F/49°C or less to prevent scalding.
​ Preparation:
  • The water supply shut off valves must be turned off- see article How to Turn Off the Water Supply to the Faucet.
  • Recommended Tools: 7/64" Hex Wrench, Thermometer
  • The following instructions assume the handle and associated handle pieces have been removed. For additional details, visit Vertical Spa: Moentrol with Integrated Transfer Valve and select the type you are repairing. The faucet guide will contain specific information on handle assemblies associated with that style of product.
  • We recommend covering the drain before removing the handle so as not loose any parts down the drain.

     

 

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Figure A

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For safety reasons plumbing guidelines recommend that the hot water in the shower should not exceed 120°F. 

The water temperature from my Moen shower system is not hot enough.

To adjust the Temperature Limit Stop,with the handle removed, loosen the adjustment hex screw with a 7/64" hex wrench and slide the screw to the highest position (See Figure A) on the metal stop tube sleeve. Tighten the hex screw. With the screw in this position your are accessing full hot water.

Test the hot water temperature (not to exceed 120°F). Move to the section in this article titled: How to test the hot water temperature.

The water temperature from my Moen shower system is too hot.

To adjust the Temperature Limit Stop, with the handle removed, loosen the adjustment hex screw with a 7/64" hex wrench and slide the screw downward. Tighten the hex screw. 

Test the hot water temperature (not to exceed 120°F).  Move to the section in this article titled: How to test the hot water temperature.
How to test the hot water temperature:

Place the handle or handle adapter back on the shower, pull the handle to the on position and rotate left. Use a thermometer to check the hot water temperature (not to exceed 120°F). If the temperature is still too hot, repeat the steps above.

Once the desired temperature is reached, reinstall the handle, see Vertical Spa: Moentrol with Integrated Transfer Valve.

For additional information on Moen products visit solutions.moen.com and select the type of faucet you are repairing. The faucet guide will contain repair details, troubleshooting and specific information on assembling handles associated with that style of product.

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