RELIEF DEVICES
An unplugged 3/4” NPT relief valve opening is provided for installing temperature and pressure relief valve.
CAUTION: TO REDUCE THE RISK OF EXCESSIVE PRESSURES AND TEMPERATURE IN THIS WATER HEATER INSTALL TEMPERATURE AND PRESSURE PROTECTIVE EQUIPMENT REQUIRED BY LOCAL CODES but not less than a combination temperature and pressure relief valve certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment or materials, as meeting the requirements for relief valve devices for hot water supply systems, ANSI Z21.22 (latest version).
This valve must be marked with a maximum set pressure not to exceed the marked maximum working pressure of the water heater. INSTALL THE VALVE INTO THE OPENING PROVIDED AND MARKED FOR THIS PURPOSE IN THE WATER HEATER, AND ORIENT IT OR PROVIDE TUBING SO THAT ANY DISCHARGE FROM THE VALVE WILL EXIT ONLY WITHIN 6 INCHES (152.4 mm) ABOVE, OR AT ANY DISTANCE BELOW THE STRUCTURAL FLOOR AND CANNOT CONTACT ANY LIVE ELECTRICAL PART. THIS DISCHARGE OPENING MUST NOT BE BLOCKED OR REDUCED IN SIZE UNDER ANY CIRCUMSTANCES.
The pressure setting of the relief valve should not exceed the pressure capacity of any component in the system. The
temperature setting of the relief valve should not exceed 210°F (98.9°C).
TEMPERATURE LIMITING CONTROL
The heater control circuit contains a high temperature cutoff switch which operates if excessive water temperatures are reached. The high temperature cutoff contacts open at 190°F (87.7°C) and must be manually reset (after a 30°F (16.6°C) drop in water temperature). Disconnect the power before resetting button.
HYDROGEN GAS (FLAMMABLE)
CAUTION
HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM SERVED BY THIS HEATERTHAT HAS NOT BEEN USED FOR A LONG PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE). HYDROGEN GAS IS EXTREMELY FLAMMABLE. To reduce the risk of injury under these conditions, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink before using any electrical appliance connected to the hot water system. If hydrogen is present, there will probably be an unusual sound such as air escaping through the pipe as the water begins to flow. THERE SHOULD BE NO SMOKING OR OPEN FLAME NEAR THE FAUCETAT THE TIME IT IS OPEN.
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