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3-18
Section 3 - Service and Repair
Figure 12. CO2175R & 2175RF Only: Typical Frost Free Airflow Configuration
THERMISTORS
Three or four thermistors are employed. All are of the type 2.
These measure the refrigerator, freezer, ice maker, or evaporator
drain pan.
REED SWITCH
A reed switch is mounted to the underside of the cabinet and a
magnet is mounted to the door. When the door is closed the
magnet trips the switch which turns the light and display off.
For the CO2175DWR model there is a second reed switch
mounted on the inside rear left corner of the top drawer.
Both drawers are monitored individually; however, when either
drawer is opened both cabinets light and the displays energize.
DEFROST
These units defrost on time and temperature. The Defrost Cycle
runs for a minimum of 18 minutes (adjustable), and stops at a
maximum of 45 minutes or when T4 reaches 42°F (non-
adjustable), whichever comes first.
Air flow in at
evaporator blade
Air passes though
fin tube evaporator
Condensate drains down trough under
evaporator, into drain pan, and into
condensate pan through drain hose. The
drain trough is warmed during defrost by
contact with evaporator fins and drain
heater attached to the drain pan.
Air flow out at
evaporator outlet
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