L22-393 R0 Page 76
24.5 Drain Valve and Return Valve Switches
These switches are a magnetically operated proximity switches. When the BLUE drain valve handle is
moved to the open position, the actuator moves away from the switch causing the switch to open.
When the drain valve is closed, the switch closes.
Opening the RED filter return valve handle closes the proximity switch, causing the “pump on” relay to
be energized; the pump begins to pump. Closing the filter return valve handle opens the proximity
switch, causing the relay to de-energize and the pump to stop pumping. These switches can be
checked with a Ω meter. When the switch is closed, there should be near zero resistance. The normal
gap between the actuator and the sensor switch on the valve handle is 1/8 inch to 1/4 inch (3 mm to 6
mm).
24.6 Transformer
The transformer is a multiple AC input voltage and 24 VAC output voltage. It can be checked by
reading the input and output voltages. A quick check for 24 VAC is done at the relay board behind the
front panel. The AC indicator is illuminated if the F1 fuse is good and the board is receiving 24 VAC.
See Section 6.1 Diagram Identifying Terminals for Second Resistance
24.7 Elements
Each element has three coils. Check all the element coils out of circuit with an Ω meter. The resistance
should correspond to the following:
208 Volt Element 14.1-16.4 Ω
240 Volt Element 18.8-21.8 Ω
If the resistance is outside of the rating, the element needs to be changed. Also check for continuity to
ground on each end of the suspect element. There should be no continuity to ground.
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