Hoshizaki HR24A Cool Down Restart, Defrost Initiation, Defrost Termination, Energy Saving Mode

Models: HR24A

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4. Cool Down Restart

EvapFM and Comp icons are on. CTh warms to 4°F above setpoint. Comp icon turns on and Comp energizes. 3-min. Comp run timer starts.

5. Defrost Initiation

EvapFM and Defrost icons are on.

a)Automatic Defrost Initiation: EvapFM and Defrost icons are on. EvapFM continues. 6-hr. DT terminates. 30‑min. DT starts. If Comp run time < 3 min., Comp icon and Comp continue until 3-min. Comp run timer terminates. Once 3-min. Comp run timer terminates, Comp icon turns off, Comp de-energizes, and defrost starts.

b)Manual Defrost Initiation: EvapFM and Defrost icons are on. To initiate a manual defrost, press and hold the "+" button until the defrost icon turns on. EvapFM continues. 30‑min. DT starts. If Comp run time < 3 min., Comp icon and Comp continue until 3-min. Comp run timer terminates. Once 3-min. Comp run timer terminates, Comp icon turns off, Comp de‑energizes, and 30-min. DT starts.

Note: If the display module panel is locked, press and hold the "-" button and the power button until "UnL" appears briefly on the display module.

6. Defrost Termination

Comp icon is on. EvapFM icon flashing. 30-min. DT terminates. 6-hr. DT starts. Comp icon turns on and Comp energizes. 3-min. Comp run timer starts. 2-min. EvapFM timer starts, EvapFM icon starts flashing, and EvapFM de-energizes. When 2-min. EvapFM timer terminates, EvapFM icon turns steady and EvapFM energizes.

7. Energy Saving Mode

ESM initiates during periods of inactivity. Once CTh cools to setpoint, 20-min. ESM timer starts. DS must remain engaged without activation (door open) for 20 min. after CTh has achieved setpoint for ESM to initiate. Once 20-min. ESM timer terminates, EvapFM operates on ESM cycle. See "EvapFM ESM Cycle" below.

Note: If DS is activated (door open) before 20-min. ESM timer terminates, ESM timer resets and 20-min. ESM timer re-starts once CTh cools to setpoint again.

EvapFM ESM Cycle:

If Comp is de-energized when 20-min. ESM timer terminates, EvapFM de-energizes.

If Comp is energized when 20-min. ESM timer terminates, EvapFM continues and cycles off with Comp.

During ESM Comp off time, EvapFM operation is 1 min. on and 5 min. off. EvapFM operates on and off with Comp.

Legend: CB–control board; Comp–compressor; CTh–cabinet thermistor; CT–cabinet temperature; DM–display module; DS–door switch; DT–defrost timer; ESM–energy saving mode; EvapFM–evaporator fan motor

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Hoshizaki HR24A service manual Cool Down Restart, Defrost Initiation, Defrost Termination, Energy Saving Mode