Hi mowjoe,
Thank you for your question. The Monitor pressure balance feature is designed to maintain the temperature of the water when the pressure changes on one side (like when a toilet is flushed in the home). The cartridge balances the flow of water to the side with the lowest pressure. If the cold water supply is turned off, the cartridge will close off the hot side as well, so no water will flow.
Best regards,
Jon
Answered by: DeltaFaucet3
Date published: 2016-12-21