Reliant FVIR GAS WATER HEATER Technical Information PDF herunterladen (Seite 36)

THERMAL EXPANSION

THE FIX The ideal ﬁ x 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 beneﬁ t of saving water and prolonging the life of

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

supply pressures are desired. A supply water pressure of 80 PSI is a maximum set by

many local or state codes.

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 ﬂ owing 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 TEMPERATURE & PRESSURE VALVE (T&P VALVE) TO

HANDLE THERMAL EXPANSION! The T&P valve manufacturers designed the valve

to be an emergency relief device only. The T&P Valve could be subject to reduced

effectiveness or failure.

FIGURE

COLD WATER INLET VALVE

(SHUT-OFF VALVE)

HOT WATER

OUTLET

COLD WATER

INLET

PRESSURE REDUCING VALVE

WITH BYPASS

COLD WATER SUPPLY TO FIXTURES

IN A CLOSED SYSTEM USE A

THERMAL EXPANSION TANK

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 36