Hoshizaki service manual HR24A Sequence Flow Chart, Startup, Cool Down Achieved, Defrost

HR24A Sequence Flow Chart

1. Startup

2. Cool Down

3. Cool Down Achieved

4. Defrost

• Defrost icon turns on.

• If Comp run time

• CTh cools to setpoint.

< 3 min., Comp icon

and Comp continue

Factory default is 39°F.

towarmsCTh4°F

setpointabove

until 3-min. Comp run

F4CTh° setpointabove

• 3-min. Comp run timer

timer terminates. Once

• 2-min. Comp delay.

3-min. Comp

terminates.

3-min. Comp run timer

• 2-min. Comp off timer

terminates, Comp

• Comp icon flashes

run timer starts.

starts.

de‑energizes and defrost

during Comp delay.

starts.

Power on

CTh in control

EvapFM energized EvapFM continues

EvapFM continues

EvapFM continues

30-min. DT terminates

Comp energized

Comp de-energized

Comp de-energized

6-hr. DT starts

2. Sequence Flow Chart

12

Setpoint Achieved

	Energy Saving Mode
	• Door must remain		• When Comp de-energized, EvapFM
	closed for 20 min. after
	setpoint achieved.		operates 1 min. on, 5 min. off.
20-Min. ESM Timer Starts		20-Min. ESM Timer Terminates
EvapFM continues		Comp cycles on and off as
Comp cycles on and off as			required by CTh
	required by CTh	EvapFM energizes on and off
			with Comp cycle
		EvapFM when Comp de-energized:
			1 min. on, 5 min. off

Door Switch activated (door open): 20-min. ESM Timer resets EvapFM energizes

Legend: Comp-compressorCTh-cabinet thermistor ESM-energy saving mode EvapFM-evaporator fan motor

DT-defrost timer

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.