DURAWATT EXR WATER HEATER

8.Open water outlet valve. Water heater is ready for operation. Heat up time will be dependent on input and tank capacity.

9.After startup and with the water heater operating, allow the water in the tank to reach desired temperature and the heating elements shut off. Draw hot water from a nearby outlet valve until the heating elements energize. This will assure proper operation of the heating elements, thermostat and other operating controls.

MAINTENANCE

1.A preventative maintenance program should be established to assure a long, trouble free life of the water heater.

2.Flushing of the tank is recommended every two or three months, depending on water conditions. To flush, disconnect (lockout) power to the unit. Open the drain valve and allow water to flow through the tank until it runs clear. Close the drain valve. Draining two or three gallons of water from the bottom of the tank on a weekly basis will also help prevent the accumulation of sediment. A scale of lime will normally form on the heating elements and the surface of the tank during heating cycles. The more hot water used, the more fresh water containing the scale-forming elements are brought into the tank. As the temperature increases, the rate of scale deposited will also increase. Sediment and scale accumulations in the tank will greatly reduce the heating ability of the heater by reducing the effectiveness of the heat transfer surfaces and can result in element failure.

3.Since PVI cannot control the use of the water heater, the water conditions or maintenance, the warranty on the heating elements does not cover poor performance, structural failure or leaking due to an excessive accumulation of scale.

4.The temperature and pressure relief valve should be checked at regular intervals. Open and close the valve to insure proper operation. If the valve does not open or close properly when tested, it must be replaced. Replace the relief valve with a like kind or one meeting the requirements stated on the rating decal located on the valve.

WARNING: THE RELIEF VALVE IS A SAFETY DEVICE. DO NOT PLUG VALVE.

5.All electrical connections must be checked two weeks after startup to assure tightness. Heating and cooling from operation can loosen connections. Every month, connections should be inspected for any discoloration of wire terminal points.

6.The contactors are sealed and require no periodic maintenance other than checking wire connections. These contactors contain MERCURY and must be returned directly to the

manufacturer for proper disposal. To return contactors, please call WATLOW CUSTOMER SERVICE @507-454-5300 for a “Return Material Authorization” number. Mail the contactor

directly to the address provided by WATLOW CUSTOMER SERVICE for proper disposal. Contact PVI @800-433-5654 to purchase the new contactor. Please have the water heater serial number when ordering replacement contactors and the printed rating of the contactor to be replaced.

7.Fuses for the load circuits are fast acting to prevent the contactor from rupturing in the event of a heater short circuit. Replace with same type and rating.

PV500-33 05-2002

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Section 33