Reliant FVIR GAS WATER HEATER Technical Information PDF herunterladen (Seite 68)

RESIDENTIAL GAS AND ELECTRIC WATER HEATER

TROUBLESHOOTING and SERVICE HANDBOOK

RELIANCE Water Heater Company Technical Training Department

THE FIX

The ideal fix involves the use of a pressure reducing valve if supply pressures are

above 60 to 70 psi, and a properly sized expansion tank. The PRV reduces supply

pressures to 40 to 60 psi allowing an economically priced and sized expansion tank to

be used. The PRV also offers the benefit of saving water and prolonging the life of

water flow valves. The PRV is not required if the system already has one or if high

supply pressures are desired.

The PRV is installed between the check valve and the water heating system. The

expansion tank is installed between the PRV and the water heating system. Follow the

manufacturers instructions for installing the expansion tank.

Run the thermal expansion check again. The pressure should increase only slightly

then hold steady throughout the recovery cycle. The expanded water is flowing back

from the heater and into the pressurized storage bladder of the expansion tank. Air

pressure will force this water out of the expansion tank into the supply once usage

resumes.

DO NOT DEPEND ON THE T&P VALVE TO HANDLE THERMAL EXPANSION! The

T&P valve, according to the makers of those valves, was designed as an emergency

relief device only. The T&P could be subject to reduced effectiveness or failure.

FIGURE

WARNING

Thermal expansion of water, if not compensated for in system design, will lead to the

early failure of components. These failures are not covered by the manufacturer’s

warranty, so it is extremely important that everyone be aware of the causes, symptoms

and solutions to thermal expansion in a closed water heating system.

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Reliant FVIR GAS WATER HEATER Technical Information Seite 68