Labconco SteamScrubbe & FlaskScrubbe Glassware Washers 44204 Series - Manual (Page 52)

Labconco Glassware Washer Service/Technical Manual
46
contact (Overfill) is actuated then the washer will stop and display
an “Overfill Alarm”. If the first contact isn’t actuated in time (3
min for tap, 5 min for DI/Pure) the washer will stop and display a
“Low Water Alarm”. See the Troubleshooting section for further
details.
**Completely drain and disconnect electrical power to the unit before
proceeding with any of these instructions.
Replacing the Pressure Switch
1. Pull the unit out of its installation space.
2. If the unit is a freestanding unit or has the cosmetic back panel,
remove the back panel.
3. Pull the black insulation jacket up and secure it.
4. Locate the Pressure switch.
5. Remove the pressure switch from the back of the tank. (note: the
switch is held in place by a self clamping tab its back side)
6. Remove the wiring connectors from the switch.
7. Loosen, unclamp and remove the Pressure Switch Hose.
8. Connect the pressure switch hose to the new Pressure Switch.
9. Reconnect the connections as shown on the wiring diagram.
a. 5-yellow to 22
b. 7BC-Black to 21
c. 7AB-Black to 11
d. 6-Orange to 12
10. Test the unit in diagnostics
a. Fill the unit in tap and check the water level
b. Drain
c. Fill the unit with DI/Pure (if applicable) and check the level
d. Drain
11. Run a single Rinse Only cycle to test for any alarms.
12. If the unit passes all tests, seat the Pressure Switch into its place.
Figure 19
Left: Pressure switch with Hose
Clam and Wiring Connectors.
The Wiring Connectors are
attached on the first, third, fourth
and sixth pins (from left to right:
22, 21, 11, and 12). The two
connectors on the left are the
leads to the “Overfill Switch” and
the leads on the right are to the
“Initial fill Switch.”
The Blue Oval encircles the
Pressure Hose’s clamp at the
Pressure Switch. When
tightening this clamp, care must
be taken not to over tighten, or
place angular force on the
connector. Over-tightening can
cause the grommet in the hose to
crack. Angular force will cause
the connector nipple to break,
rendering the pressure switch
useless.