CHAMPION USN10 - Manual (Page 55)

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PART 5: BASIC SERVICE
5.3.5 Float Switch Replacement
Refer to Fig. 6.4, Fig. 6.5, and Fig. 6.6, Part 6, Replacement Parts, for a detailed drawing of the float
switch assembly. The tank contains a float switch assembly which monitors the water level in the tank.
When the water level drops below a preset level the ball on the float switch stem drops and opens a reed
switch . The control relay associated with the float switch changes state. A set of normally closed
contacts open interrupting power to the 120VAC control circuit and the dishwasher stops. If you suspect
a defective float switch: Turn power off at the dishwasher control cabinet. Drain the tank and inspect the
float.
Make sure the float is clean and moves freely. Identify the float switch wires in the junction box located
on the lower corner of the dishwasher front. Disconnect the float switch and connect its associated
control wires together. Turn power on and restart the dishwasher. If the dishwasher operates normally,
then replace the float. To remove the float assembly: Remove the float switch cover. Remove the
5/16-18 nut on the outside of the tank. The mounting hole is keyed so the float switch will not turn.
Remove the float switch assembly from the inside of the tank. Install a replacement in reverse order.
Reconnect the float switch wires in the junction box. Turn power on, refill the tank, and test the
dishwasher for normal operation.
5.3.6 Drain and Overflow Assembly
Refer to Fig. 6.3, Part 6, Replacement Parts, for a detailed drawing of the drain and overflow assembly.
Note items 1-4. These parts make up the overflow assembly. The assembly consists of an overflow tube
with drain box topped by a hinged cover. The cover tilts up to allow inspection and cleaning. Lift up the
hinged cover and inspect the overflow tube if an obstruction is suspected. Item 10 shows the drain
screen. This screen should be inspected daily and cleaned. Item 12 illustrates the drain assembly. It
consists of soldered copper pipe and if defective must be replaced as a unit. Note the cleanout plug to the
left of the drain valve. This plug can be removed to clean possible obstructions from the drain assembly.
Item 13 shows the 1-1/2" cleanout plug in the drain trunk line. Remove the plug to inspect and clean the
main dishwasher drain line.
5.3.7 Thermometer Replacement
Refer to Fig. 6.4, Fig 6.5, and Fig. 6.6, Part 6, Replacement Parts, for a detailed drawing of the ther -
mometer assemblies. The thermometers are mounted to brackets on the front of the dishwasher. Ther-
mometer capillary tubes run from the bottom of the dishwasher to the right and left ends of the tanks.
The thermometer bulbs are retained inside the tanks by a 1/2" locknut. The final rinse thermometer bulb
mounts directly into the upper final rinse piping at the top of the dishwasher. Tank and final rinse ther-
mometers are factory sealed indicating devices which are accurate within ±3° of the intended range of
use. The thermometers cannot be calibrated and must be replaced if defective. To replace a thermometer:
Drain the machine and turn off all power. Have a helper hold the thermometer bulb from the outside of
the machine. Remove the 1/2" locknut from the inside of the tank and pull the thermometer sensor bulb
out of the tank. Remove the nuts and retainer from the thermometer bracket. Pull the thermometer out
the front of the bracket. Replace the thermometer and reassemble in reverse order. Be sure to apply
plumber's putty, (Champion P/N 104889), to seal the thermometer bulb fitting in the tank. Return the
dishwasher to normal operation and check the
temperature reading.