4
ETM Float Switch Maintenance
Each ETM machine contains three water level oat switches. These oat
switches control certain functions of the machine. The rst oat switch will
control the auto-ll feature. The second oat switch controls power to the
vacuums. The third oat switch controls when the large sump pump
comes on and helps to prevent cavitation in the pump. Having these
prevents water from getting into the vacuum stacks and from spilling out
of the solution tank.
Vacuum Float Switch Maintenance and Replacement
Cleaning and maintaining oat switches will help to extend the life your
machine. Regular cleaning is required for proper functionality. To clean the
vacuum level switch:
1. Remove 7” clear vacuum tank lid located on top of the vacuum tank.
2. Use a ashlight to locate the position of the oat switch. The vacuum
tank oat switch will be located on the inside wall of the tank just below the
vacuum ports.
3. Once located, reach in and hold the oat switch nger all the way to one
side by pushing on the opposite side.
4. Using your other hand, or nger, roll the clip off of its tabs by pulling on
the bottom of the opposite tab from which you are pushing. It should not
take a lot of pressure to remove the switch, so be careful not to break it.
5. Check oat nger and where it attaches for debris or any other damage.
If dirty, clean. If damaged, or one of the male tabs where the oat hooks is
damaged, refer to the oat switch replacement section.
6. Once cleaned, replace oat nger, at side down, onto the male position
tabs located on the oat switch body in the vacuum tank. First, hook one
side of the nger to one tab. Then roll and pull the tab with index nger
until other clip snaps into place.
7. Check to insure oat still works by turning on both vacuums with the
vacuum tank lid off. Reach inside and lift the oat nger. If vacuums turn
off, the oat works. If the vacuums stay on, oat body may need replace-
ment, or oat nger is installed upside down.
Vacuum Float Switch Replacement
Required:
-Colored tape
-New oat switch, rubber washer, and plastic nut
-Silicone
-Medium/deep depth 13/16” socket and ratchet
-Medium crescent wrench
-Philips screwdriver or drill
1. Using Philips head screw driver, remove ETM side panel by taking out
the ten Philips head screws holding panel onto machine.
2. Locate vacuum oat switch wires coming out of the black vacuum tank
directly under the vacuums. Disconnect the two oat switch wires that are
plugged into the system.
3. At this point, use the colored tape to mark the wires that the oat switch
was unplugged from. The back end of the vacuum oat switch should be
visible. Remove the 7” clear vacuum tank lid located on top of the vacuum
tank.
4. Use a ashlight to locate the position of the oat switch inside of the
tank. The vacuum oat switch will be located on the inside wall of the tank
below the vacuums.
5. Once located, reach in and hold the oat switch nger all the way to one
side by pushing on the opposite side.
1. Using your other hand, or nger, roll the clip off of its tabs by pulling on
the bottom of the opposite tab from which you are pushing. It should not
take a lot of pressure to remove the switch, so be careful not to break it.
2. Place the medium crescent wrench on the back nut of the oat switch
and the 13/16” socket on the inside nut of the oat switch. Loosen the oat
by rotating the ratchet counter clockwise until completely loose.
Make sure not to lose any nuts or rubber washers in case they are needed
in the future.
3. On the new oat switch, hold the oat switch nger all the way to one
side by pushing on the opposite side.
4. Using your other hand, or nger, roll the clip off of its tabs by pulling on
the bottom of the opposite tab from which you are pushing. It should not
take a lot of pressure to remove the switch, so be careful not to break it
5. Place the rubber washer over the threads of the new switch and all the
way down to the 13/16” nut side.
6. Place a thin layer of silicone on the rubber washer.
7. Thread oat switch (with actuating nger off) wires back through
vacuum tank hole and thread in using the 13/16” socket.
8. Using your hand, thread the plastic nut onto the back side of the oat
switch. Place medium crescent wrench on the nut to hold in place
9. Tighten the 13/16” oat until snug. Make sure at side of oat body is
facing towards the top of the vacuum tank.
10. Replace oat nger, at side down, onto the male position tabs located
on the oat switch body in the vacuum tank. First, hook one side of the
nger to one tab. Then roll and pull the tab with index nger until other clip
snaps into place.
11. Check to insure new oat switch works by turning on both vacuums
with the vacuum tank lid off. Reach inside and lift the oat nger. If vacu-
ums turn off, the oat works. If the vacuums stay on or will not turn on,
the oat nger may be installed upside down or wires were not connected
completely.
Auto-ll Float Switch Maintenance and Replacement
Cleaning and maintaining oat switches will help
to extend the life your machine. Regular cleaning is
required for proper functionality. To clean the auto-ll
level switch:
1. Remove silver cover on the front of the blue solution tank by removing
the four Philips head screws.
2. Use a ashlight to locate the position of the oat switch. The auto-ll
oat switch will be located on the inside wall of the tank just below the
water inlet.
3. Once located, reach in and hold the oat switch nger all the way to one
side by pushing on the opposite side.
4. Using your other hand, or nger, roll the clip off of its tabs by pulling on
the bottom of the opposite tab from which you are pushing. It should not
take a lot of pressure to remove the switch, so be careful not to break it.
5. Check oat nger and where it attaches for debris or any other damage.
If dirty, clean. If damaged, or one of the male tabs where the oat hooks is
damaged, refer to the oat switch replacement section.
6. Once cleaned, replace oat nger, at side down, onto the male position
tabs located on the oat switch body in the vacuum tank. First, hook one
side of the nger to one tab. Then roll and pull the tab with index nger
until other clip snaps into place.
7. Check to insure oat still works by turning on both vacuums with the
vacuum tank lid off. Reach inside and lift the oat nger. If vacuums turn
off, the oat works. If the vacuums stay on, oat body may need replace-
ment, or oat nger is installed upside down.
Auto-ll Float Switch Replacement
Required:
-Colored tape
-New oat switch, rubber washer, and plastic nut
-Silicone
-Medium/deep depth 13/16” socket and ratchet
-Medium crescent wrench
-Philips screwdriver or drill
1. Using Philips head screw driver, remove ETM side panel by taking out
the ten Philips head screws holding panel onto machine.
2. Locate vacuum oat switch wires coming out of the
blue solution tank directly behind the main pump. Disconnect the two oat
switch wires that are plugged into the system. At this point, use the
colored tape to mark the wires that the oat switch was unplugged from.
3. The back end of the vacuum oat switch should be visible.
4. Use a ashlight to locate the position of the oat switch inside of the
tank. The vacuum oat switch will be located on the inside wall of the tank
below the vacuums.
5. Once located, reach in and hold the oat switch nger all the way to one
side by pushing on the opposite side.
6. Using your other hand, or nger, roll the clip off of its tabs by pulling on
the bottom of the opposite tab from which you are pushing. It should not
take a lot of pressure to remove the switch, so be careful not to break it.
7. Place the medium crescent wrench on the back nut of the oat switch
GENERAL INFORMATION
