American Water Heater American Water Heaters Residential Gas Water Heater Benutzerhandbuch

15

As water is heated, it expands (thermal expansion). In a closed system

the volume of water will grow when it is heated. As the volume of water 

grows there will be a corresponding increase in water pressure due to 

thermal expansion. Thermal expansion can cause premature tank failure 

(leakage). This type of failure is not covered under the limited warranty.

Thermal expansion can also cause intermittent Temperature-Pressure 

Relief Valve operation: water discharged from valve due to excessive 

pressure build up. This condition is not covered under the limited warranty. 

The Temperature-Pressure Relief Valve is not intended for constant relief 

of thermal expansion.

A properly sized thermal expansion tank must be installed on 

all closed systems to control the harmful effects of thermal 

expansion. Contact a local plumbing service agency to have a 

thermal expansion tank installed.

be installed on this water heater when connected to copper pipe.
All gas piping must comply with local codes and ordinances or with the 

National Fuel Gas Code (ANSI Z223.1/ NFPA-54). Copper and brass tubing

and fittings (except tin lined copper tubing) should not be used.

Figure 10 shows typical attachment of  water piping to the water heater. 

The water heater is equipped with 3/4 inch NPT water connections.
note: If using copper tubing, solder tubing to an adapter before 

1.  Locate the temperature and pressure relief valve on the water heater 

(also known as a T&P relief valve). See Figure 11.

2.  Locate the slit running the length of the T&P relief valve insulation.

3. Spread the slit open and fit the insulation over the T&P relief valve. See

Figure 11.  Apply gentle pressure to the insulation to ensure that it is fully 

seated on the T&P Relief Valve. Once seated, secure the insulation with 

duct tape, electrical tape, or equivalent.  IMPORTANT:  The insulation 

and tape must not block the discharge opening or hinder access to the 

manual relief lever (Figure 11). Ensure a discharge pipe is installed into

the T&P valve discharge opening per the instructions in this manual.

4. Locate the hot water (outlet) & cold water (inlet) pipes to the water heater.

5.  Locate the slit running the length of a section of pipe insulation.

6. Spread the slit open and slip the insulation over the cold water (inlet)

pipe. Apply gentle pressure along the length of the insulation to ensure 

that it is fully seated around the pipe. Also, ensure that the base of 

the insulation is flush with the water heater. Once seated, secure the

insulation with duct tape, electrical tape, or equivalent.  

7. Repeat steps 5 and 6 for the hot water (outlet) pipe.

8.  Add additional sections of pipe insulation as needed.

Temperature-Pressure Relief Valve

must  comply  with  ANSI Z21.22-

CSA 4.4 and ASME code.

Properly sized Temperature-Pressure 

Relief Valve must be installed in 

opening provided.
Can  result  in  overheating  and

excessive  tank  pressure.
Can cause serious injury or death.

This water heater is provided with a properly rated/sized and certified

combination Temperature-Pressure  Relief  Valve  (T&P  valve)  by  the

manufacturer. The valve is certified by a nationally recognized testing

laboratory that maintains periodic inspection of production of listed 

equipment of materials as meeting the requirements for Relief Valves 

for Hot Water Supply Systems, ANSI Z21.22 • CSA 4.4, and the code

requirements of ASME.
If replaced, the new T&P valve must meet the requirements of local 

codes, but not less than a combination Temperature-Pressure Relief 

Valve rated/sized and certified as indicated in the above paragraph.

The new valve must be marked with a maximum set pressure not to 

exceed the marked hydrostatic working pressure of the water heater 

(150 psi = 1,035 kPa) and a discharge capacity not less than the water

heater Btu/hr or kW input rate as shown on the water heater’s model

rating plate.
Note: In addition to the factory installed Temperature-Pressure Relief 

Valve on the water heater, each remote storage tank that may be 

installed and piped to a water heating appliance must also have its 

own properly sized, rated and approved Temperature-Pressure Relief 

Valve installed. Call the toll free technical support phone number listed 

on the back cover of this manual for technical assistance in sizing a 

Temperature-Pressure Relief Valve for remote storage tanks.
For safe operation of the water heater, the Temperature-Pressure 

Relief Valve must not be removed from its designated opening nor 

plugged. The Temperature-Pressure Relief Valve must be installed 

directly into the fitting of the water heater designed for the relief

valve. Install discharge piping so that any discharge will exit the 

pipe  within  6  inches  (15.2  cm)  above  an  adequate  floor  drain,

or external to the building. In cold climates it is recommended 

that it be terminated at an adequate drain inside the building. Be 

certain that no contact is made with any live electrical part. The