Service Manual

12
3. Undercounter and Work Top: Freezer
Freezer Sequence Flow Chart
Legend: Comp-compressor ConFM-condenser fan motor CTh-cabinet thermistor DH-defrost heater DT-defrost timer DTh-defrost thermistor EvapFM-evaporator fan motor MH-mullion heater PH-perimeter heater
1. Startup/Cool Down
2. Cool Down Achieved
Comp energized ConFM energized EvapFM energized MH energized PH energized
CTh in control
Setpoint Achieved
CTh warms above setpoint
3. Defrost
Comp de-energized ConFM de-energized EvapFM de-energized MH de-energized PH de-energized
5. Defrost Termination
DTh in control
2-min. Comp off timer starts
2-min. Comp on timer starts
6-hr. or 8-hr. DT starts
Defrost Termination: 50°F (°10C) achieved or 1 hr. backup defrost timer terminated.
8-hr. DT terminates Evap. temp. below 41°F (5°C) 5-min. min. DT starts 60-min. max. DT starts DH energized Comp de-energized ConFM de-energized EvapFM de-energized
MH de-energized
PH de-energized
Defrost Initiation: Time/Temp achieved.
Note: Delays
a) 2-min. minimum Comp on timer starts when Comp energizes. b) 2-min. minimum Comp off timer starts when Comp de-energizes. c) 5-min. minimum defrost time. d) 1-hr. maximum defrost time. e) DOT (drip off time) 3-min. Comp/ConFM delay timer starts when defrost termination temperature is met (drip off time (DOT)). f) FDD (fan delay after defrost) EvapFM starts once 7-min. EvapFM delay timer terminates or DTh reaches 25°F (-4°C).
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DH de-energized 8-hr. DT starts After DOT Delay: Comp energized ConFM energized MH energized PH energized After FDD EvapFM energized
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Defrost Terminated
8-hr. DT terminates
Evap. temp. below 41°F (5°C)
Power on Red LED On (5 sec. Delay)
Red LED off Green LED Flashes If Red LED ashes, check CTh or DTh