Float Switch Check And Cleaning - Hoshizaki F-500BAJ Service Manual

E. Float Switch Check and Cleaning
1. Float Switch Check
A dual float switch is used to determine that there is sufficient water in the reservoir
during fill and refill. CB monitors UFS to de-energize WV when UFS closes during fill and
refill. CB monitors LFS to energize WV when LFS opens during the freeze cycle (refill).
CB monitors the time between LFS opening and UFS closing (90-sec. low water safety).
CB also monitors the time between UFS closing and LFS opening (30-min. freeze timer).
No adjustment is required.
1) Remove the front panel. Next, move the power switch to the "OFF" position, then move
the control switch to the "DRAIN" position.
2) Move the power switch to the "ON" position to drain the appliance.
3) After the water has drained, move the power switch to the "OFF" position and unplug
the appliance from the electrical outlet (F-300BAJ) or turn off the power supply
(F-500BAJ).
4) Disconnect the FS molex plug from the control box and check continuity across FS
wires. (BK) to (R) for UFS and (BK) to (BU) for LFS. See Fig. 4. With the water reservoir
empty, FS switches are open. If open, continue to step 5. If closed, follow the steps in
"II.E.2. Float Switch Cleaning." After cleaning the floats, check them again. Replace if
necessary.
5) Reconnect the FS molex plug on the control box.
6) Plug the appliance back into the electrical outlet (F-300BAJ) or turn on the power supply
(F-500BAJ). Next, move the control switch to the "ICE" position, then move the power
switch to the "ON" position and let the water reservoir fill.
7) Once the reservoir is full and GM starts, move the power switch to the "OFF" position,
then unplug the appliance from the electrical outlet (F-300BAJ) or turn off the power
supply (F-500BAJ).
8) Disconnect the FS molex plug from
the control box and check continuity
across FS wires. (BK) to (R) for UFS
and (BK) to (BU) for LFS. With the
water reservoir full, FS switches
are closed. If open, follow the steps
in "II.E.2. Float Switch Cleaning."
After cleaning the floats, check them
again. Replace if necessary.
9) Reconnect the FS molex plug on the
control box.
10) Move the power switch to the "ON"
position to start the automatic
icemaking process.
11) Replace the front panel in its correct position, then Plug the appliance back into the
electrical outlet (F-300BAJ) or turn on the power supply (F-500BAJ).
Float Switch Assembly
Reservoir Cover
Reservoir
Fig. 3
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