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15
b) Freezer
Freezer Sequence Flow Chart
3. Cool Down Restart
Legend:
Comp-compressor
ConFM-condenser fan motor
CTh-cabinet thermistor
DH-defrost heater
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
Slight
Delay at
Startup
CTh cools to
3°F (1.7°C)
below setpoint.
Factory default
-4°F (-20°C)
CTh warms
to 3°F (1.7°C)
above setpoint
4. Defrost
EvapFM energized
MH energized
PH energized
Comp de-energized
ConFM de-energized
5. Defrost Termination
MH energized
PH energized
DH de-energized
DTh warms to 59°F (15°C)
Note:
a) EvapFM de-energizes when door is opened on FS and when upper door is opened on HS.
b) 2-minute minimum Comp on timer starts when Comp energizes.
c) 2-minute minimum Comp off timer starts when Comp de-energizes.
d) 3-minute Comp delay timer starts when defrost termination temperature is met.
e) 8-minute EvapFM delay timer starts when defrost termination temperature is met. (3-minute
delay timer if defrost initiated manually)
f) 13-minute temperature display delay timer starts when defrost termination temperature is met.
g) 5-minute minimum defrost time.
h) 1-hour maximum defrost time.
DTh in control
Power on
DH energized
MH energized
PH energized
Comp de-energized
ConFM de-energized
EvapFM de-energized
2-min. Comp off
timer starts
MH energized
PH energized
13-minute temperature display
delay timer starts
3-min. Comp delay timer starts
(EvapFM starts with Comp on manual
defrost restart)
8-min. EvapFM delay timer starts
(except on manual defrost restarts)
2-min. Comp on
timer starts
DTh reaches 32°F (0°C),
then 4-hour cumulative
Comp run timer starts
DTh is at or below 32°F (0°C)
and 4-hour cumulative Comp
run timer terminates