Hoshizaki 73168 service manual Cabinet and Rail Cooling

Power Switch "ON," Rail Cooling Switch "NORMAL" or "LOW" Position (continued)

When in the "NORMAL" position, RailFM operates continuously.

When in the "LOW" position, RailFM operates continuously when rail is cooling down and intermittently (per F9 setting) when rail cool down is achieved. See "II.D.4.a) Switch Settings" and "II.D.5. Service Menu."

2.

4. Cabinet Defrost

• 6-hour DT expires, then resets

• 100-minute defrost termination timer starts

DTh in control

To 5 below

C on	C off	C on	C off
R on	R on	R off	R off

Legend: C-cabinet cooling CabFM-cabinet fan motor Comp-compressor ConFM-condenser fan motor CLLV-cabinet liquid line valve CTh-cabinet thermistor

Cabinet and Rail Cooling

14

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

DH energized RailFM energized RLLV energized CabFM de-energizedCLLV de-energizedComp de-energizedConFM de-energizedPH de-energized

DH-defrost heater DT-defrost timer DTh-defrost thermistor DTst-defrost thermostat PH-perimeter heater R-rail cooling RailFM-rail fan motor RLLV-rail liquid line valve

(continued)

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 1:

When Comp is off: 5-minute Comp delay timer starts

When Comp is on: 5-minute recovery delay timer starts, Comp continues (rail on)

•C on-CTh at or above setpoint

•C off-CTh has reached 3.6°F (2°C) or more below setpoint

•R on-RTh at or above setpoint

•R off-RTh has reached 3.6°F (2°C) or more below setpoint

Stage 2: 5-minute CabFM and PH delay timer starts

To 2 previous page

C on	C on
R on	R off

C on	C on
R on	R off

CabFM energized PH energized

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

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

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