DURAWATT
®
ELECTRIC WATER HEATERS
PV500-6 05/13
8
5
START-UP PROCEDURES AND OPERATION
WARNING: Turn off all electrical service to the appliance when accessing the controls located inside the
control cabinet. The cabinet contains high voltage wiring and terminals. If the electrical service is not
turned off and these wires or terminals are touched, a dangerous shock causing personal injury or loss of
life could occur. Close the control cabinet before restoring electrical service to the appliance.
Coupez l'alimentation avant intervention sur l'appareil.
1. Use multimeter to check resistance to ground between all element terminals and the element mounting flange.
(See table 1)
Fill the heater with water. Open the relief valve to allow air in the tank to escape. Be sure all connections into
the tank are tight as leaks at tank fittings or heating elements can cause damage.
Check inside of electrical enclosure for leaks with tank full of water at water line pressure. Heating element
gaskets are pressure tested at factory but may leak if unit has been in dry storage for a long period of time.
If leaks are present, tighten all four nuts uniformly on the element mounting flange in a criss-cross pattern.
Tighten one nut, then the nut on the diagonal from the first nut. Next, tighten the nut adjacent to the second nut,
and then the nut diagonal from the third nut. Repeat this sequence until all nuts are tight. Each nut should be
tightened to 15 foot pounds of torque. To avoid warping the flange, do not over tighten.
IMPORTANT:
All leaks must be corrected prior to turning on electricity to avoid damage to electrical
components within the enclosure.
Electric element (design may vary): 3 phase elements have 3 terminals; 1 phase elements have 6 terminals.
FIGURE 3
2. The tank must be full of water before turning on electricity. If elements are energized without water in the tank,
they will burn out immediately. Warranty is void on dry starts.
3. Check all electrical connections for tightness before turning the unit on.
4. Energize manual disconnect switch. Check for proper voltage (with voltmeter) on power circuit. Voltage should
not vary more than 5% from voltage shown on data plate. If voltage exceeds these limits, immediately turn off
main disconnect and contact utility company.
5. Energize control circuit switch. Check for proper voltage.