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Removal of the Polyarc/Controller
1. Make sure that the Polyarc has been cooled to room temperature.
2. Turn of the PID controller using the switch on the front of the unit.
3. Disconnect the Polyarc heater cable assembly from the PID controller by first
unscrewing the nut on the connector, then pull the cable connector out of the controller
connector on the back of the box.
4. Unplug the controller from the 120V grounded outlet.
Replacing the Fuse
In the unlikely event that the controller display remains blank/dark after properly installing the
controller/Polyarc on your system and turning it on, the circuit protection fuse may have blown.
Each unit is shipped with a spare fuse to address these situations.
1. To inspect/replace the fuse, open the small spring-loaded fuse holder located on the
back-right side of the enclosure by inserting a small bladed instrument (e.g. screw driver)
in the slot in the middle of the holder, and while gently pressing it in towards the
enclosure, rotate it counter-clockwise until the tabs line up and the holder pops out of the
holder. (Figures 5 and 6)
(Figure 5) (Figure 6)
2. Remove the fuse from the holder and inspect its filament to confirm that it has blown (i.e.
the small wire in the middle of the fuse will be broken).
3. If the fuse is blown, insert the new fuse into the holder (direction does not matter), and
re-insert the fuse holder into the enclosure.
4. Prior to turning the PID controller back on, make sure that any potential causes that can
be identified for causing the fuse to blow have been addressed.
