Instruction manual

101
7.5 Replacing the Fuses
CAUTION: Disconnect power to the controller before opening the front panel!
Locate the fuses on the relay interface board on the lower left side of the back of the controller
enclosure. See figure 5, Identification of Parts. Gently remove the old fuse from its retaining clip.
You can verify that the fuse has been blown by measuring continuity between the ends of the fuse
using an ohmmeter. If it is blown, discard. Press the new fuse into the clip, secure the front panel
of the controller, and return power to the unit.
Warning! Use of non-approved fuses can affect product safety approvals. Specifications are
shown below. To ensure that UL/CSA and CE product safety certifications are maintained, it is
recommended that a Walchem fuse be used.
Fuse Walchem P/N
F1 Protects Input 102833 5 x 20 mm 1.6 amp 250 V
F2 Protects pH, ORP, and Dispersant
relay outputs
102834 5 x 20 mm 6.3 amp 250 V
F3 Protects Bleed, Feed, Bio 1 and Bio 2
relay outputs
102834 5 x 20 mm 6.3 amp 250 V
Bleed relay is unfused if model code
voltage code = 6, 7, or E