Hoshizaki KM-650MRH, KM-650MAH, KM-650MWH Controls and Adjustments, Default Dip Switch Settings

3. Controls and Adjustments

a)Default Dip Switch Settings

The dip switch is factory-adjusted to the following positions:

Dip Switch No.	1	2	3	4	5	6	7	8	9	10
KM-650MAH	OFF	OFF	OFF	OFF	ON	ON	OFF	OFF	OFF	OFF
KM-650MWH	OFF	OFF	OFF	OFF	ON	ON	OFF	OFF	OFF	OFF
KM-650MRH	OFF	OFF	OFF	OFF	ON	ON	OFF	OFF	ON	OFF

Freeze Timer (9 & 10)

Normally in the OFF position.

Pump-Out Frequency Control (5 & 6)

Pump-Out Timer (3 & 4)

Harvest Timer (1 & 2)

b)Harvest Control – Thermistor

A thermistor (semiconductor) is used for a harvest control sensor. The resistance varies depending on the suction line temperatures. The thermistor detects the temperature of the evaporator outlet to start the harvest timer. No adjustment is required. If necessary, check for resistance between thermistor leads, and visually check the thermistor mounting, located on the suction line next to the evaporator outlet.

Temperature (°F)	Temperature (°C)	Resistance (kΩ)
0	-18	14.401
10	-12	10.613
32	0	6.000
50	10	3.871
70	21	2.474
90	32	1.633

Check a thermistor for resistance by using the following procedure:

1)Disconnect the connector K3 on the board.

2)Remove the thermistor. See "V.K. Removal and Replacement of Thermistor."

3)Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 minutes.

4)Check for a resistance between thermistor leads. Normal reading is within 3.5 to 7 kΩ. Replace the thermistor if it exceeds the normal reading.

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