An alarm bell with silencing switch is available as an option on this water heater. The alarm bell can be used to provide an audible indication of a control sensed malfunction. The user must specify the safety function or multiple safety functions that the alarm bell will sound on when the water heater is ordered from the factory. The alarm bell typically is used to indicate a low water condition or a high water temperature condition. The alarm is furnished with a silencing switch to turn off the audible alarm while trouble shooting a control sensed malfunction that is indicated by an audible alarm. Once the control sensed malfunction is corrected, the silencing switch must be returned to the “ON” position to
START-UP PROCEDURE
Never operate the heating elements without being certain the water heater is filled with water and a temperature and pressure relief valve is installed in the relief valve opening on top of the heater.
The pilot switch(es) (if equipped) mounted on the control cabinet permit the heater to be turned on and off without having to operate the electrical disconnect switch. The pilot switch interrupts only the 120 VAC control circuit in the water heater. Full power is still present at the terminal block, fuses and contactors.
DANGER:
Full power is present whenever the cabinet
door is opened, even with the pilot switch(es) turned off.
THERMAL EXPANSION OF WATER
A relief valve that discharges periodically may be due to thermal expansion in a closed system. Many water systems are equipped with pressure reducing valves, check valves or back flow preventers which may cause the water system to be closed. As water is heated it will expand in volume due to thermal expansion. The system must make allowance for this expansion. If an expansion tank is not provided in the system, water pressure may increase to the point where
the water heater’s temperature and pressure relief valve opens to relieve the excess pressure. The temperature and pressure relief valve is not intended for the constant relief of thermal expansion. This is an unacceptable condition and must be corrected. Do not plug or cap the relief valve discharge! A properly sized expansion tank is typically installed in the potable water system to relieve the pressure built up by thermal expansion of heated water. Consult your local plumbing contractor and plumbing wholesaler for assistance in properly selecting an expansion tank for your system.
As the water heater operates, there may be noises generated by the expansion and contraction of the metal parts of the water heater and related piping. These noises may occur during periods of heat up or cool down. They do not represent harmful or dangerous conditions.
FILLING THE WATER HEATER
1.Insure that the electrical power to the water heater is in the “OFF” position. If the power disconnect point is out of sight, lock it in the open (“OFF”) position and tag to prevent unexpected application of power.
2.Close the water heater drain valve(s).
3.Open a nearby hot water faucet to allow the air in the system to escape as the tank fills.
4.Fully open the cold water inlet valve to the water heater to begin filling the heater and piping.
NOTE: The cold water supply must be
left in the open position when the water heater is in use.
5.Check the nearby hot water faucet to verify that air is exiting the tank as it fills with water. Allow water to run until a constant flow is obtained at the faucet. This will insure that all air is purged from the system.
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