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Moen Solutions

1/2" Exact Temp Valve Filter Screen Cleaning

 

This article will provide instructions on how to properly clean the filter screens for a 3301 and 3321 1/2" Exact Temp valve. The valve was introduced in 2000 and retired in 2006.

Preparation:

  • Recommended Tools: Wrench, Phillips screwdriver, Tweezers or Needle-Nose Pliers
  • The following instructions assume the handles have been removed. For additional details, visit solutions.moen.com and select the type you are repairing. The faucet guide will contain specific information on handle assemblies associated with that style of product.

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The filter screen is located on the back side of the the check valve assembly.

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Preparing the Valve:

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1. Prior to cleaning the filter screens, the water supply to the valve must be shut off. The valve's internal flow stops are opened and closed by turning the two large (1 1/8") outer hex nuts (A) located in the center of the valve.

Turn off the flow to the valve by using a wrench to turn each of the large hex nuts (A) fully clockwise. To fully shut off the flow, several full turns of each hex nut (A) are required.

After shutting off the water to the valve, release any residual water by turning the flow extension (B) fully counterclockwise.

Accessing the Filter Screen:

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2. The filter screen is located on the back side of the the check valve assembly (C). To remove the check stop assembly (C), position a wrench on the large outer hex nut (A) and hold it stationary. Use a flathead screwdriver in the slot in the center of the check stop assembly (C) and unthread counter-clockwise until it comes out.

Cleaning the Filter Screen:

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3. Remove the filter screen (D) by sliding it off the back side of the check valve assembly (C).

If the filter screen (D) did not come out with the check stop assembly kit (C), use tweezers or needle-nose pliers to pull it out of the opening that the check stop assembly kit (C) was removed from.

Clean any debris from the filter screens (D) by rinsing the filter screens (D) with water.

Flushing the Valve:

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5. Flushing the valve eliminates any mineral build-up and loose debris that may have accumulated inside the valve body. To clear the system, water will need to be forced through the brass valve body.

To flush the valve, turn the water on by using a wrench to slightly rotate one of the large (1 1/8") outer hex nuts (A) counter-clockwise.

Turn the water back off by using a wrench to rotate the large (1 1/8") outer hex nuts (A) fully clockwise.

Repeat this process for the second large (1 1/8") outer hex nut (A).

Installing The Check Stop Assembly:

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6. Attach the filter screen (D) to the check stop assembly (C) by sliding the large opening of filter screen (D) onto the raised edge on the back of the check stop assembly kit (C).

Reinstall the check stop assembly kit (C) by using a flathead screwdriver in the slot in the center of the check stop assembly (C) and thread it clockwise into the valve until tight.

Turn on the flow to the valve by using a wrench to turn each of the large hex nuts (A) fully counter-clockwise. To fully turn on the flow, several full turns of each hex nut (A) are required.


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


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