American Standard uses an anti-scald device much like Delta faucets. This device prevents accidental scalding due to the shower handle being turned too far to the hot setting. The anti-scald will only allow the water to reach a certain temperature. Over time the anti-scald needs adjusting. Adjusting the anti-scald is much like turning the dial on a thermostat. It is a good idea to adjust the anti-scald in small increments. The cartridge has a set of numbers ranging from zero to nine, with nine being the hottest temperature range.
Things You'll Need
Turn off the water supply to the shower. The cut-off valves are behind the shower wall. The access to the valves is in the adjacent room. Ensure that the faucet handle is also in the off position.
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Place a towel or rag over the bathtub drain. Locate and remove the set screw securing the handle to the faucet cartridge with a Phillips-head screwdriver. Pull the handle away from the cartridge.
Remove the securing screws holding the rear cover plate to the wall with the Phillips-head screwdriver. Pull the cover plate and the cartridge sleeve away from the cartridge.
Insert a flat-head screwdriver between the base of the cartridge and rear of the anti-scald dial. The anti-scald dial is an indicator notch or arrow pointing to a number on the cartridge. Twist the screwdriver to pop the indicator forward so that you can adjust the indicator.
Turn the indicator with your fingers to the next number on the cartridge. Push the anti-scald indicator back in until it locks into position. Place the cartridge sleeve around the cartridge with the flanged end pointing to the wall. Reattach the cover plate and the faucet handle. Turn the water supply on to test the water temperature. Continue adjusting as necessary.