Hoshizaki 73183 Freezer Sequence Flow Chart, b Freezer, Startup/Cool Down, Cool Down Achieved

b) Freezer

Freezer Sequence Flow Chart

1. Startup/Cool Down

2. Cool Down Achieved

4. Defrost

5. Defrost Termination

3. Cool Down

Restart

DTh is at or below 32°F (0°C)

DTh warms to 59°F (15°C)

CTh cools to

DTh reaches 32°F (0°C),

and 4-hour cumulative Comp

3-min. Comp delay timer starts

3°F (1.7°C)

CTh warms

run timer terminates

then 4-hour cumulative

(EvapFM starts with Comp on manual

Slight

below setpoint.

to 3°F (1.7°C)

Comp run timer starts

defrost restart)

Delay at

Factory default

above setpoint

8-min. EvapFM delay timer starts

Startup

-4°F (-20°C)

(except on manual defrost restarts)

CTh in control

DTh in control

13-minute temperature display

2-min. Comp on

2-min. Comp off

Power on

timer starts

timer starts

delay timer starts

15

MH energized

Comp energized

EvapFM energized

DH energized

MH energized

PH energized

ConFM energized

MH energized

MH energized

PH energized

EvapFM energized

PH energized

PH energized

DH de-energized

MH energized

Comp de-energized

Comp de-energized

PH energized

ConFM de-energized

ConFM de-energized

EvapFM de-energized

Legend: Comp-compressorConFM-condenser fan motor CTh-cabinet thermistor DH-defrost heater DTh-defrost thermistor EvapFM-evaporator fan motor MH-mullion heater PH-perimeter heater

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.