Hoshizaki 73168 service manual Operation, Power Switch ON, Rail Cooling Switch OFF Cabinet

Stage 1:

5-minute Comp delay timer

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

1. Cabinet C.

Cycle Steps

1.Startup

•2-minute

Comp delay timer starts

•6-hour DT starts

2. Cool Down			3. Cool Down Achieved			4. Cabinet Defrost
									From 5 below
		2-minute Comp						DTh in control
		delay timer starts			to
				CTh reaches
					CTh warms setpoint
				3.6°F (2°C)		• 6 hour DT expires, then
				or more
							resets
				below setpoint
						• 100-minute defrost
	CTh in control						termination timer starts

Cooling	Sequence of
	Operation

Initial startup begins here

To 5 below

12

CabFM energized	CabFM energized	CabFM energized	CLLV energized
CLLV energized	CLLV energized	CLLV energized	DH energized
PH energized	Comp energized	PH energized	CabFM de-energized
	ConFM energized	Comp de-energized	Comp de-energized
	PH energized	ConFM de-energized	ConFM de-energized
			PH de-energized

From 4 above

5.Cabinet Cool Down Defrost Recovery (defrost terminated)

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)

Stage 2:

5-minute CabFM and

PH delay timer

To 2 above

CLLV energized	CabFM and PH	CabFM energized
DH de-energized	energize for 10 sec.	CLLV energized
CabFM de-energized	CLLV energized	Comp energized
Comp de-energized	Comp energized	ConFM energized
ConFM de-energized	ConFM energized	PH energized
PH de-energized

Legend: CabFM-cabinet fan motor Comp-compressorConFM-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