Hot Water Heater Pressure Relief Valve Discharge Pipe Installation

This temperature pressure relief valve is attached to the discharge pipe.

Hot water heater pressure relief valve discharge pipe installation.

8 termination of the tpr drain pipe cannot be more than 6 inches or less than two pipe diameters above the floor ground or waster receptor flood rim level. This is especially crucial for cast iron valves. Not be smaller than the diameter of the outlet of the valve served and shall discharge full size to the air gap. Temperature and pressure relief valves shall be installed so that the sensing element of the valve extends into the heater tank and monitors the temperature in the top 6 inches of the heater or tank.

Step 2 hold the tpr valve with the slip joint pliers. Pressure relief valve installation mounting. Not be directly connected to the drainage system. This is a very simple video on how to replace add a discharge pipe on a water heater.

For flanged valves be sure to draw the bolts down evenly. The tpr valve will activate if either water temperature measured in degrees fahrenheit or pressure measured in pounds per square inch psi exceed safe levels. Thread the tpr valve clockwise into the pressure relief fitting on the water heater and tighten it by hand until it is tight. It s designed to release the pressure when there is too much of a load built up inside the water heater.

A trapped tpr dischage pipe is a common defect when a replacement water heater s tpr valve is lower than the original one and the installer connects to the exisitng discharge piping at the wall. The valve should be connected to a discharge pipe also called a drain line that runs down the length of the water heater tank. Brush pipe joint compound on the threads on the tpr valve using the brush supplied with the pipe joint compound. Mount prvs in a vertical position which means upright and with the spindle vertical.

Verify the proper valve is installed the tprv on a water heater is set to discharge at 150 psi or 210 fahrenheit. A valve installed in any position other than vertical might not perform correctly. Whether you re installing a new indoor or outdoor tankless water heater or replacing a pressure release valve include a length of pvc pipe as a discharge line. Discharge through an air gap located in the same room as the water heater.

These numbers will be printed right on the valve or on a tag attached to the. Every relief valve which is designed to discharge water or steam shall be connected to a discharge pipe.