Float Switch Check And Cleaning - Hoshizaki DCM-300BAH Service Manual

E. Float Switch Check and Cleaning
1. Float Switch Check
1) Remove the front panel and move the control switch to the "DRAIN" position.
2) Press and hold the safety switch to start draining the appliance.
IMPORTANT! Appliance will not start unless the safety switch is engaged.
3) Allow the water to drain from the reservoir, then release the safety switch. Move the
control switch to the "ICE" position.
4) Remove the FS molex plug from the control box and check continuity across FS
wires. Black (BK) to red (R) for the upper float and black (BK) to blue (BU) or dark blue
(DBU) for the lower float. See Fig. 7. With the water reservoir empty, the float switches
are open.
If open, continue to step 5. If closed, follow the steps in "II.E.2. Float Switch Cleaning."
After cleaning the float switches, check them again. Replace if necessary.
5) Connect the FS molex plug on the control box.
6) Press and hold the safety switch to start filling the reservoir.
7) Once the reservoir is full and GM starts, release the safety switch.
8) Remove the FS molex plug from the control box and check continuity across FS
wires. Black (BK) to red (R) for the upper float and black (BK) to blue (BU) or dark blue
(DBU) for the lower float. They should be closed. If open, follow the steps in "II.E.2.
Float Switch Cleaning." After cleaning the float switches, check them again. Replace if
necessary. Replace the front panel in its correct position.
2. Float Switch Cleaning
Depending on water conditions, scale may build up on FS. Scale on the switch can cause
the floats to stick. In this case, FS should be cleaned and checked.
1) Remove the front panel and move the control switch to the "DRAIN" position.
2) Press and hold the safety switch to start draining the appliance.
3) Allow the water to drain from the reservoir, then release the safety switch.
4) Turn off the power supply.
5) Remove FS assembly from the reservoir cover. See Fig. 8.
6) Wipe down FS assembly with a mixture of 1 part Hoshizaki Scale Away and 25 parts
warm water. Rinse the FS assembly thoroughly with clean water.
7) While not necessary, the floats can be removed from the shaft during cleaning. If you
remove them, note that the blue float is on top. The floats must be installed with the
magnets inside them towards the top of the switch. See Fig. 7. Installing the floats
upside down will affect the timing of FS operation.
8) Rinse FS assembly thoroughly with clean water and replace in its original position.
9) Replace the front panel in its correct position.
10) Move the control switch to the "ICE" position.
11) Turn on the power supply to start the automatic icemaking process.
Legend: Comp–compressor; FS–float switch; GM–gear motor
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