Service Manual

12
2. Freezer
3. Cool Down Restart
Legend: Comp-compressor ConFM-condenser fan motor CTh-cabinet thermistor DH-defrost heater DrH-drain heater DTh-defrost thermistor EvapFM-evaporator fan motor MH-mullion heater PH-perimeter heater TXVH-thermostatic expansion valve heater
1. Startup/Cool Down
2. Cool Down Achieved
Comp energized ConFM energized EvapFM energized (30-sec. delay after Comp energized)
CTh in control
Slight Delay at Startup
CTh cools to 3°F (1.7°C) below setpoint. Factory default -2°F (-19°C)
CTh warms to 3°F (1.7°C) above setpoint
4. Defrost
Comp de-energized ConFM de-energized EvapFM de-energized (60-sec. delay after Comp de-energized)
5. Defrost Termination
DH de-energized *After Drip Time Delay: Comp energized ConFM energized EvapFM energized *(Once DTh reaches 15°F (-9°C) or 4-min. EvapFM terminates, whichever comes rst)
DTh warms to 77°F (25°C) or 1-hr maximum defrost timer terminates
Note: *Delays
a) EvapFM delays energizing if DTh above 32°F (0°C). b) EvapFM de-energizes when door is opened on -FS models and when upper door is opened on -HS models. c) 2-min. minimum Comp on timer starts when Comp energizes. d) 2-min. minimum Comp off timer starts when Comp de-energizes. e) 5-min. minimum defrost time. f) 1-hr. maximum defrost time. g) "dEF" displayed during defrost. h) 3-min. Comp/ConFM delay timer starts when defrost termination temperature is met. i) 4-minute EvapFM delay timer starts when Comp/ConFM delay timer terminates j) 15-minute temperature delay timer starts when EvapFM energizes
Power on
DH energized Comp de-energized ConFM de-energized EvapFM de-energized
2-min. Comp off timer starts
2-min. Comp on timer starts
5-hr. cumulative Comp run or 4-hr. continuous run defrost timer terminates
Freezer Sequence Flow Chart
DrH energized MH energized PH energized TXVH energized (F2A Models)
5-min. minimum defrost
DTh in control
5-hr. cumulative Comp run or 4-hr. continuous run defrost timer starts