4-6
b. Connect an ohm-meter across the switch terminals to measure the resistance across the limit
switch connection.
c. When the elements are down in the tank the interlock switch is closed and the resistance
across the switch will be zero.
d. Lift the element rack up while continuing to measure the resistance across the switch. The
rack only needs to be lifted a short distance to open the switch. A click should be heard when
the switch opens. The resistance will go up significantly when the switch opens. The
resistance will not be infinite unless the switch wires are disconnected. If there is any doubt
about the resistance, remove the wires and check the resistance. With the wires removed the
resistance will be infinite.
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