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2. Sequence Flow Chart
HR24A Sequence Flow Chart
• Defrost icon turns on.
• If Comp run time
<3min., Comp icon
and Comp continue
until 3-min. Comp run
timer terminates. Once
3-min. Comp run timer
terminates, Comp
de-energizes and defrost
starts.
Legend:
Comp-compressor
CTh-cabinet thermistor
ESM-energy saving mode
EvapFM-evaporator fan motor
DT-defrost timer
1. Startup
3. Cool Down Achieved
EvapFM continues
Comp energized
CTh in control
• CTh cools to setpoint.
Factory default is 39°F.
• 3-min. Comp run timer
terminates.
• 2-min. Comp off timer
starts.
4. Defrost
EvapFM continues
Comp de-energized
Note:
• EvapFM de-energizes when door is open.
• There is a Comp delay of 2 min. at startup.
• There is a minimum Comp run time of 3 min.
• There is a Comp delay of 2 min. after a power interruption.
• To initiate manual defrost, press and hold the "+" button until the
defrost icon turns on the display module.
• Defrost lasts 30 min.
Power on
EvapFM continues
Comp de-energized
EvapFM energized
3-min. Comp
run timer starts.
30-min. DT terminates
6-hr. DT starts
2. Cool Down
CTh 4°F
above setpoint
• 2-min. Comp delay.
• Comp icon ashes
during Comp delay.
CTh warms to 4°F
above setpoint
Energy Saving Mode
20-Min. ESM Timer Starts
EvapFM continues
Comp cycles on and off as
required by CTh
Setpoint
Achieved
• Door must remain
closed for 20min. after
setpoint achieved.
20-Min. ESM Timer Terminates
Comp cycles on and off as
required by CTh
EvapFM energizes on and off
with Comp cycle
EvapFM when Comp de-energized:
1 min. on, 5 min. off
• When Comp de-energized, EvapFM
operates 1 min. on, 5 min. off.
Door Switch activated (door open):
20-min. ESM Timer resets
EvapFM energizes