Service Manual

11
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Charts
1. Refrigerator
3. Cool Down Restart
1. Startup/Cool Down
2. Cool Down Achieved
CTh in control
Slight Delay at Startup
CTh cools to 3°F (1.7°C) below setpoint. Factory default 38°F (3°C)
CTh warms to 3°F (1.7°C) above setpoint
4. Defrost
5. Defrost Termination
Note:
a) EvapFM de-energizes when door is opened on -FS models and when upper door is opened on -HS models. b) 2-min. minimum Comp on timer starts when Comp energizes. c) 2-min. minimum Comp off timer starts when Comp de-energizes. d) 5-min. minimum defrost time. e) 1-hr. maximum defrost time. f) "dEF" displayed during defrost. g) 15-minute temperature delay timer starts when Comp/ConFM energize.
Power on
2-min. Comp off timer starts
2-min. Comp on timer starts
2-hr cumulative compressor run or 2-hr continuous compressor run defrost timer terminates
Legend: Comp-compressor ConFM-condenser fan motor CTh-cabinet thermistor DTh-defrost thermistor EvapFM-evaporator fan motor MH-mullion heater
5-min. minimum defrost
DTh in control
DTh warms to 44°F (6.6°C) or 1-hr maximum defrost timer terminates
Comp energized ConFM energized EvapFM energized
Comp de-energized ConFM de-energized EvapFM de-energized (60-sec. delay before de-energized)
EvapFM energized Comp de-energized ConFM de-energized
Comp energized ConFM energized EvapFM energized
Cycle Steps
Refrigerator Sequence Flow Chart
MH energized