Temperature & Pressure Relief Valve

For protection against excessive pressure and/or tempera- tures, a temperature and pressure relief valve has been installed in the water heater.

ANY REPLACEMENT VALVE MUST NOT EXCEED THE TEMPERATURE AND PRESSURE RATING. FAILURE TO INSTALL AND MAINTAIN A NEW, PROPERLY LISTED TEMPERATURE AND PRESSURE RELIEF VALVE WILL RELEASE THE MANUFACTURER FROM ANY CLAIMS WHICH MIGHT RESULT FROM EXCESSIVE TEMPERA- TURE OR WATER PRESSURE.

Pressure rating of the valve must not exceed the working pressure shown on the rating plate of the water heater. The discharge capacity must be equal to or greater than the input to the water heater. Temperature and Pressure Relief valve piping must terminate 152mm (6 in.), no more than 305mm (12 in.) (reference the applicable code) above a floor drain or external to the building. Do not thread, cap, or plug the end of this discharge line. Be certain that no con- tact is made with any live electrical part. Do not connect dis- charge line directly to drain (see Figure 2A). To prevent bod- ily injury, hazard to life or damage to property, the relief valve must be allowed to discharge water in the event of excessive temperature or pressure developing in the water heater. The function of the temperature and pressure relief valve is to discharge water in quantities should circum- stances demand. If the discharge pipe is not directed to drain as shown in Figure 2A, or other suitable means, the water flow may cause property damage.

The discharge line:

6.must not have any valve between the relief valve and the water heater.

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 caus- ing pressure inside the water heater to increase. This may cause the temperature and pressure relief valve to dis- charge small quantities of hot water. To prevent this, it is recommended that a diaphragm-type expansion tank (suit- able for potable water) be installed on the cold water supply line. The expansion tank must have a minimum capacity of

5.6litres (1.5 US gallons) for every 190 litres (50 US gal- lons) of stored water and be rated at the working pressure of the water heater. Contact the local water supplier or plumbing inspector for information on other methods to con- trol this situation.

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

Installation Checklist

Check Here

1.Have the vent location limitations and minimum height for vent termination and maximum vent length been checked?

2.Are the terminal and vent pipes installed and sealed properly?

3. Has the gas piping been leak tested?

1.must not be smaller than the outlet pipe size of the relief valve,

2.must not be plugged or blocked,

3.must be material capable of withstanding 99°C (210°F) without distortion,

4.must be installed so as to allow complete drainage of both temperature and pressure relief valve,

5.must terminate at an adequate drain, and

WARNING

Do not attempt to operate this water heater with the cold water inlet valve closed. Manually operate the Temperature and Pressure Relief valve at least once a year. Standing clear of the outlet (discharge water may be hot), lift and release the lever handle on the Temperature and Pressure Relief valve to make the valve operate freely.

NEVER OPERATE THE HEATER IF IT IS NOT COMPLETELY FILLED WITH WATER. TO MAKE SURE THE HEATER IS FILLED, OPEN A HOT WATER TAP UNTIL A FULL FLOW OF WATER IS VISIBLE WITH NO AIR ESCAPING.

4.Is there 508mm (20 in.) at the top and 25mm (1 in.) around the vent pipe?

5.Have you taken steps to prevent water damage in case of leaks?

6.Is the diptube installed in the cold water inlet connection?

7.Is the water heater completely filled with water?

8.Does the gas piping conform with the recom- mendations of your Local Gas Utility Company?

9.Is the vent terminal opening unobstructed?

10.Is a temperature and pressure relief valve installed?

11.Is the drain pipe from the T&P valve unob- structed?

12.Has all plastic and cardboard packaging mate- rial been removed from the heater and vent- ing?

If the answer to all of the questions above is “Yes”, read the Operating Instructions and proceed with lighting the heater.

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61009 REV. C (09-03) specifications

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