Bradford-White Corp Commercial Electric Water Heaters Manual De Usuario

CP-5M-5/02-Reprinted in U.S.A.

Excessive water pressure is not the most common
cause of relief valve leakage.  It is often caused by
a  “closed system.”  A check valve,  back flow
preventer or pressure reducing valve, in the inlet
system will not permit the expanded hot water
volume to equalize pressure with the main.  A
relief valve must release this water or the water
heater and plumbing system will be damaged.

When such a condition is encountered, local
codes or inspection agency should be consulted to
determine which of the following procedures is
acceptable in your area.

• Installation of an expansion tank.
• Removal of the check valve.

4. Examine the flange area of the elements for 

gasket leakage.  Tighten the screw-in flange 
or, if necessary,  follow the “Water and Lime 
Scale Removal” procedure to remove the 
element and replace the “O” ring gaskets that 
seal each element.

1. Place the water heater electrical disconnect 

switch on the “OFF” position.

2. Contact your mechanical contractor or 

service technician.