Float Switch Check And Cleaning; Float Switch Check - Hoshizaki KM-320MAH Service Manual

E. Float Switch Check and Cleaning
FS is used to determine that there is sufficient water in the water tank after the 1-min.
fill cycle and after each harvest cycle. FS is also used to determine that the appropriate
volume of water has been converted into ice before switching out of the freeze cycle. No
adjustment is required.

1. Float Switch Check

To check FS, follow the steps below.
1) Turn off the power supply.
2) Remove the front panel, then move the
control switch to the "OFF" position.
3) Drain the water tank.
a) On KM-320M_H, KM-515M_H,
KM-600M_H, KM-650M_H, and
KM-901M_H, remove the base cover, then
disconnect one end of the pump tubing to
drain the water tank. See Fig. 3. After the
water tank has drained, reconnect the pump
tubing.
b) On KM-1340M_H and KM-1601M_H, remove the rubber cap covering the overflow
pipe in the water tank. Remove the overflow pipe by turning it counterclockwise. After
the water tank has drained, replace the overflow pipe and the rubber cap in their
correct positions. Note: Be sure the overflow pipe o-ring is in its correct position on
the overflow pipe.
4) Remove the control box cover.
5) Disconnect FS connector from CB K5 connector.
6) Check for continuity across FS leads. With the water tank empty, FS should be open.
If open, continue to step 7. If closed, follow the steps in "II.E.2. Float Switch Cleaning."
After cleaning FS, check it again. Replace if necessary.
7) Reconnect FS connector to CB K5 connector, then replace the control box cover in its
correct position.
8) Move the control switch to the "ICE" position. Replace the front panel in its correct
position, then turn on the power supply. After 1 min., the 1-min. fill cycle should end and
the initial harvest cycle should begin. If the initial harvest cycle begins, FS is good and
the check is complete. If the initial harvest cycle does not begin, continue to step 9.
9) Turn off the power supply.
10) Remove the front panel. Move the control switch to the "OFF" position.
11) Remove the control box cover.
12) Disconnect FS connector from CB K5 connector.
Disconnect This
End of Pump
Tubing to Drain
Water Tank
Base Cover
34
Fig. 3