Controls And Adjustments; A) Default Dip Switch Settings; B) Harvest Control - Thermistor - Hoshizaki KM-251BAH Service Manual

3. Controls and Adjustments

a) Default Dip Switch Settings

The dip switches are factory-adjusted to the following positions:
Dip Switch No.
KM-251BAH OFF ON OFF ON ON
S5 Dip Switch (Do Not Adjust)
Dip Switch No.
KM-251BAH ON ON OFF OFF ON
S4
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)
Check a thermistor for resistance by using the following procedure:
1) Disconnect the connector K3 on the board.
2) Remove the thermistor. See "V.I. Removal and Replacement of Thermistor."
S4 Dip Switch
1 2 3 4 5
1 2 3 4 5
Freeze Timer (9 & 10)
Do not adjust (3, 4, 5, 6, 7, & 8)
0
10
32
50
70
90
6 7 8 9
ON ON OFF OFF OFF
Resistance (kΩ)
-18 14.401
-12 10.613
0 6.000
10 3.871
21 2.474
32 1.633
14
10
S5 (do not adjust)
Float switch
control and refill
counter. Do not
adjust.