American Water Heater ADCG, DCG3-Series, 71681 warranty Please note the following

Index

Figure 8: Commercial Unit with Auxiliary Storage Heater - Forced Circulation

With or Without Building Recirculation - Top Inlet/Outlet Connections

	Outlet
	Boosted
Thermometer	Temperature	Thermometer
	Pre-Heated
	Water to
	the Booster

Hot Water to Fixtures

Thermal

Expansion

Tank

Pressure
Reducing	1 1/2” Cold
Valve
	water supply

Shut-off valve

Check valve	Shut-off
	valve

		Temperature and
	Temperature and	Pressure Relief Valve
	Pressure Relief Valve
Typical		Pre-Heater
Booster
Heater

Note: Install a vacuum relief valve if required by local codes.

Please note the following:

DO NOT install this water heater with iron piping. The system should be installed only with piping that is suit- able for potable (drinkable) water such as copper, CPVC, or polybutylene. DO NOT use PVC water piping. DO NOT use any pumps, valves, or fittings that are not compatible with potable water.

DO NOT use valves that may cause excessive restric- tion to water flow. Use full flow ball or gate valves only. DO NOT use 50/50 tin-lead solder (or any lead based solder) in potable water lines. Use 95/5 tin-antimony or other equivalent material.

DO NOT tamper with the gas valve/thermostat, igniter, or temperature and pressure relief valve. Tampering voids all warranties. Only qualified service technicians should service these components.

DO NOT use with piping that has been treated with chromates, boiler seal, or other chemicals.

DO NOT add any chemicals to the system piping which will contaminate the potable water supply.

Closed System/Thermal Expansion

Periodic discharge of the temperature and pressure relief valve may be due to thermal expansion in a closed water supply system. The water utility supply meter may contain a check valve, backflow preventer or water pressure reducing valve. This will create a closed water system. During the heating cycle of the water heater, the water expands causing pressure inside the water heater to increase. This may cause the temperature and pressure relief valve to discharge small quantities of hot water. To prevent this, it is recommended that a diaphragm-type expansion tank (suitable for potable water) be installed on the cold water supply line. The expansion tank must be properly sized for the application. Contact the local water suppli- er or plumbing inspector for information on other meth- ods to control this situation.

Important: Do not plug or remove the temperature and pressure relief valve.

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