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The water within the water heater tank expands as it is heated and
increases the pressure of the water system. If the relieving point of
the water heater’s temperature-pressure relief valve is reached, the
valve will relieve the excess pressure. The temperature-pressure
relief valve is not intended for the constant relief of thermal
expansion. This is an unacceptable condition and must be corrected.
It is recommended that any devices installed which could create a
closed system have a by-pass and/or the system have an expansion
tank or device to relieve the pressure built by thermal expansion in the
water system. Expansion tanks are available for ordering through a
local plumbing contractor. Contact the local water supplier and/or a
service agency for assistance in controlling these situations.
NOTE: To protect against untimely corrosion of hot and cold
water fittings, it is strongly recommended that di-electric
unions or couplings be installed on this water heater when
connected to copper pipe.
Figure 3 shows the typical attachment of the 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 attaching the adapter to the cold water inlet connection.
Do not solder the cold water supply line directly to the cold
water inlet, it will harm the dip tube and damage the tank.
FIGURE 3.
WATER PIPING PRESSURE TEST
This section is only for the manufacturer installing the water heater
when the installation is to comply with H.U.D. Standards.
When testing the water ways, H.U.D. Standards state: “Water
distribution system: All water piping in the water distribution system
shall be subjected to a pressure test. The test shall be made by
subjecting the system to air or water at 100 psi for 15 minutes without
loss of pressure. When air pressure is used, the water heater
shall not be connected during the test.”
FIGURE 4.
TEMPERATURE-PRESSURE RELIEF VALVE
This heater is provided with a properly certified combination
temperature - pressure relief valve by the manufacturer.
• If water piping system is to be air pressure tested, the water
heater must be disconnected from the water piping system.
• Failure to disconnect the water heater during air pressure
testing of the water system could result in DEATH, SERIOUS
BODILY INJURY, OR PROPERTY DAMAGE.