3 component repair and replacement – CHAMPION USN10 User Manual

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PART 5:

BASIC SERVICE

5.3 Component Repair and Replacement

(Cont.)

5.3.8 Tank Heat Thermostat Adjustment and Replacement

Refer to Fig. 6.4, Fig. 6.5 and Fig. 6.6 , Part 6, Replacement Parts, for a detailed drawing of the

thermostat assembly. The tank has a control thermostat mounted on its front in a stainless steel

enclosure. The thermostat capillary tube runs to the side of the tank. The thermostat sensor bulb

enters the tank and is secured inside the tank with a 1/2" locknut. The thermostat is adjusted by

turning a small adjustment screw mounted on the side of the device. The thermostat has an

operating range of 110-200°F. Place the machine in normal operation and monitor the thermom-

eter. Wash tank temperature should maintain a minimum of 150°F. Final rinse booster tank

temperature should maintain a minimum of 180°F.

Wash Tank Temperature = 150°F minimum

Final Rinse Booster Tank Temperature = 180°F minimum

To adjust a thermostat: Turn the adjusting screw incrementally 1/8 to 1/4 of a turn clockwise.

Monitor the temperature thermometer after each adjustment until the desired temperature setting

is maintained during normal dishwasher operation.

To replace a thermostat: Drain the tanks and turn off all power to the dishwasher.

Have a helper hold the thermostat sensor bulb from the outside of the machine and remove

the 1/2" locknut from the interior of the tank. Pull the bulb and capillary back to the thermostat

junction box. Note the wire locations and disconnect the thermostat. Remove two retaining nuts

and remove the thermostat assembly. Install a new thermostat in reverse order. Be sure to apply

plumber's putty, (Champion P/N 104889), to seal the thermostat bulb fitting in the tank. Return

the dishwasher to normal operating condition and adjust the thermostat as described above.

5.3.9 Tank Heat High Limit Adjustment and Replacement

Refer to Fig 6.4, Fig. 6.5 and Fig. 6.6, Part 6, Replacement Parts, for the detailed drawing of the

thermostat and high limit assembly. The tank has two types of thermostats. The tank heat thermo-

stat (as described in 5.3.8) and a tank high limit thermostat. The high limit thermostat protects

the tank from overheating. The high limit thermostat is located below the tank thermostat and

above the element. The high limit is not adjustable. It contains a red pushbutton located in the

center. The red button pops out if the temperature exceeds 210°F/99°C. Press the red button to

reset the high limit. Determine the cause of the high temperature condition.

To replace the highlimit: Drain the tanks and turn off all power to the dishwasher. Have a

helper hold the high limit bulb from the inside of the machine and remove the locknut from the

interior of the tank. Pull the bulb back to the junction box. Note the wire location s and discon-

nect the high limit. Install the new high limit in the reverse order, making sure that you apply a

plumber's putty (Champion P/N 104889), to seal the high limit fitting in the tank. Return the

dishwasher to normal operating condition.

5.310 Final Rinse (Steam) Thermostat Adjustment and Replacement

Refer to Fig. 6.16, Part 6, Replacement Parts, for a detailed drawing of the steam booster

assembly. Note Item 1. This shows the location of the final rinse control thermostat. The

thermostat has a range of 105-195°F. However, the operating range for final rinse application is

180-195°F. The thermostat wiring to the normally closed and common contacts. The normally

closed contacts open when the thermostat is satisfied.

The final rinse thermostat controls operation of the steam booster solenoid. It senses the outlet

temperature of the final rinse water leaving the booster and energizes or denergizes the steam

solenoid as needed to maintain the final rinse temperature within 180-195°F.