Waters Prep Series Installation And Maintenance Manual page 154

Pump power fuse
The pump power fuse protects the pump from excessive current loads. If this
fuse is open, no power is available at the pump.
To replace the power pump fuse:
1. Shut down the controller and remove the power cord from its rear-panel
connector.
Warning:
switch and unplug the power cord from the rear panel.
2. Insert a small flat-blade screwdriver into the slot on the fuse holder for
the pump power fuse.
3. Turn the screwdriver to release the fuse holder.
4. Slide the holder with the fuse out of the rear panel.
5. Replace the open fuse with a new fuse.
Pump fuse operating voltages are 120/220 VAC 4 A and 125-VAC
Tip:
IEC (time delay) 5
6. Insert the new fuse and holder back into the fuse chamber on the rear
panel.
7. Lock the fuse holder into place using the screwdriver.
Proportioning valve fuse
A special power supply provides proper proportioning valve performance. If
you fail to hear the proportioning valve operating within the fluid handling
unit drawer during gradient operation, examine the fuse on the rear panel of
the fluid handling unit.
The 0.5-A fuse is housed on the rear panel of the fluid handling unit as shown
in the figure below. Replace this fuse with a 0.5-A fuse (Startup Kit).
3-70 Troubleshooting, Testing, and Maintenance
To avoid shock, turn off the controller front panel power
το
20 mm.