Thermostatic Cartridge Calibration Instructions for 1/2" Exposed Thermostatic Shower System

The thermostatic mixing valve cartridge mixes hot water and cold water to maintain a preset water temperature. The thermostatic cartridge provides comfort and safety, because it maintains the water temperature to a preset temperature, even if there is a sudden decrease in the cold water pressure, to prevent scalding from excessively hot water.

Thermostatic cartridges may be calibrated to set the water temperature range and the maximum water temperature.

Adjusting the Water Temperature Range

The Coventry Brassworks thermostatic valve has been tested to perform correctly at the factory, and the maximum temperature of 110°F has been set. If you desire a hotter or colder temperature range, you may recalibrate the valve after installation, when both hot and cold lines are 100% operational, and all installation debris has been flushed from the water lines.

  1. Use a small screwdriver to loosen the screw located at the base of the large temperature control lever.
  2. Grasp firmly the center of the large temperature control lever and pull carefully outwards, to detach it from the stem of the thermostatic cartridge.
  3. To increase the factory set temperature, slowly rotate the cartridge stem counterclockwise using your bare fingers. To reduce the temperature from the factory setting, slowly rotate the cartridge stem clockwise using your bare fingers. (Do not use pliers on the stem of the cartridge.)
  4. Insert the temperature control lever back onto the cartridge stem with the handle pointing to the 6 o’clock position.
  5. Tighten the set screw on the temperature control lever.

Setting the Maximum Water Temperature

The Coventry Brassworks thermostatic valve has been tested to perform correctly at the factory, and the maximum temperature of 110°F has been set.

After installation or when replacing the thermostatic cartridge, the maximum temperature of the thermostatic cartridge may need to be reset. It is important that you set the maximum water temperature properly to preserve the anti-scald feature of the shower valve.

  1. Use a small screwdriver to loosen the screw located at the base of the large temperature control lever.
  2. Grasp firmly the center of the large temperature control lever and pull carefully outwards, to detach it from the stem of the thermostatic cartridge.
  3. With the shower running, slowly turn the stem of the thermostatic cartridge counterclockwise using your bare fingers until a maximum hot temperature is reached. This should be 102°F to 108°F, or slightly uncomfortably hot to the touch. To increase the temperature, turn counterclockwise; to decrease the temperature, turn clockwise. (Do not use pliers on the stem of the cartridge.)
  4. Without turning the cartridge stem, insert the temperature control lever back onto the cartridge stem with the handle pointing to the 3 o’clock position. In this position it will be close to its stops, and when fully on will not move any further in a counterclockwise direction.
  5. Tighten the set screw on the temperature control lever.

The shower should now be set so that the user can adjust the temperature from cold to a secure and comfortable hot temperature.

Use your hand to test the temperature of running water before bathing.

Do not dismantle the thermostatic cartridge. Doing so may make the cartridge inoperable and will also void the warranty.