Service Manual

12
2. Refrigerator: Prep Table
Refrigerator: Prep Table Sequence Flow Chart
2. Cool Down
3. Cool Down Achieved
CTh closed
Comp energized
ConFM energized
EvapFM energized
CTh open
EvapFM energized
Comp de-energized
ConFM de-energized
4. Defrost
8-hr. DT terminates
20-min. DT starts
EvapFM energized
Comp de-energized
ConFM de-energized
20-min. DT terminates
8-hr. DT starts
Legend: Comp–compressor; ConFM–condenser fan motor; CTh–cabinetthermostat;
8-hr. DT–8-hour defrost timer; 20-min.DT–20-minutedefrosttimer;
EvapFM–evaporatorfanmotor
CTh above setpoint
CTh cools to setpoint
CTh above setpoint CTh above setpoint
20 min. DT in control
CTh in control
1. Startup
EvapFM energized
Freezer Sequence Flow Chart
1. Startup/Cool Down
2. Cool Down Achieved
CTh closed
Comp energized
ConFM energized
EvapFM energized
MH energized
PH energized
CTh open
Comp de-energized
ConFM de-energized
EvapFM de-energized
MH de-energized
PH de-energized
3. Defrost
8-hr. DT terminates
20-min. DT starts
DH energized
Comp de-energized
ConFM de-energized
EvapFM de-energized
MH de-energized
PH de-energized
3. Freezer: All
Legend: Comp–compressor; ConFM–condenser fan motor; CTh–cabinetthermostat;
DH–defrostheater; 8-hr. DT–8-hour defrost timer;
20-min.DT–20-minutedefrosttimer; EvapFM–evaporatorfanmotor;
MH–mullionheater; PH–perimeterheater
20-min. DT terminates
8-hr. DT starts
DH de-energized
CTh in control
CTh above setpoint
CTh cools to setpoint
CTh above setpoint
CTh above setpoint
20 min. DT in control