Hoshizaki REFRIGERATED PREP TABLE WITH RAISED RAIL 73168 User Manual download pdf (Page 12)

12

C. Sequence of Operation Charts

1. Cabinet Cooling

Legend:

CabFM-cabinet fan motor

Comp-compressor

ConFM-condenser fan motor

CLLV-cabinet liquid line valve

CTh-cabinet thermistor

DH-defrost heater

DT-defrost timer

DTh-defrost thermistor

DTst-defrost thermostat

PH-perimeter heater

CabFM energized

CLLV energized

PH energized

Comp de-energized

ConFM de-energized

4. Cabinet Defrost

1. Startup 2. Cool Down 3. Cool Down Achieved

CabFM energized

CLLV energized

Comp energized

ConFM energized

PH energized

CTh in control

DTh reaches 49°F (9.4°C) or

100-minute defrost termination timer expires or

DTst temperature reaches 120°F±5°F (49°C±3°C)

CabFM energized

CLLV energized

PH energized

CTh warms to

setpoint

•2‑minute

Comp delay

timer starts

•6‑hourDT

starts

5. Cabinet Cool Down Defrost Recovery

(defrost terminated)

CabFM energized

CLLV energized

Comp energized

ConFM energized

PH energized

Stage 1:

5-minute Comp

delay timer

DTh in control

To 5 below

From 5 below

To 2 above

From 4

above

•6hourDTexpires,then

resets

•100‑minutedefrost

termination timer starts

CabFM and PH

energize for 10 sec.

CLLV energized

Comp energized

ConFM energized

Stage 2:

5-minute CabFM and

PH delay timer

Power Switch "ON," Rail Cooling Switch "OFF"

CLLV energized

DH energized

CabFM de-energized

Comp de-energized

ConFM de-energized

PH de-energized

CLLV energized

DH de-energized

CabFM de-energized

Comp de-energized

ConFM de-energized

PH de-energized

CTh reaches

3.6°F (2°C)

or more

below setpoint

2-minute Comp

delay timer starts

Cycle Steps

Initial startup

begins here

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 65 66

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