Power Soak 37179 PS-275 Service Manual - Manual (Page 36)

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7.6 Liquid Level Sensors
There are two Liquid Level Sensors in the side wall of the wash tank, and two in the
side wall of the sanitize tank (if equipped with a sanitize tank). The sensor located at
the bottom of the tank is used to detect when the tank has been drained and the sensor
at the top of the tank is used to determine when the tank is full. To check operation,
unplug the white connector from the UPM. Measure the resistance between the face of
the liquid level sensor and the appropriate pin of the white connector (see section 6.0 in
this manual). If the reading is greater than one ohm, clean the face of the sensor,
inspect the wiring connections or replace the sensor. A reading greater than one ohm
may be caused by a dirty sensor, a broken wire, or a loose connection. The loose
connection may be at the sensor connection to the wiring harness or the wiring harness
connector may not be tight at the back of the Control Panel.
Description UPM pin number Wire Color
Wash Tank Low ( W-L) Pin 20 White with Orange stripe
Wash Tank High (W-H) Pin 21 White with Green stripe
Sanitize Tank Low (S-L) Pin 22 White with Yellow stripe
Sanitize Tank High (S-H) Pin 23 White with Blue stripe
Wash Tank High
Level Sensor
Hole Cover
Or
Optional
Chemical Dispenser
Wash Tank Low
Level Sensor