De-pressurize and unplug the ZAG before attempting any maintenance or removing the top or bottom panels!
Routine maintenance consists of periodic carbon replacement and outlet filter replacement. Under normal, intermittent use, desiccant should last up to six months.
Activated carbon/alumina replacement
Activated carbon canister is located behind top panel. Top half of canister is exposed to allow visual inspection of mixture. As the = mixture is used, its color changes from purple to brown. When ¾ of the canister has changed to brown, replace mixture. The mixture can not be regenerated and must be discarded.
Replacing the mixture
- Place towel or cloth across bottom panel to prevent scratches.
- Disengage four (4) panel screws by turning ¼ turn counterclockwise.
- Pull panel out and lay down on top of bottom panel.
- Unscrew nuts off brackets.
- Detach tubing by loosening compression fittings using 5/8” wrench.
- Remove canister from panel.
- Remove bottom black plug using 7/8” wrench.
- Pour out pellets while tapping canister lightly.
- Re-fill canister by slowly pouring in fresh activated carbon/impregnated alumina mixture.
- Tap side of canister while filing to settle mixture and reduce air pockets.
- Apply Teflon® tape to the plug and replace in bottom of canister and tighten.
- Reverse procedure to install canister to ZAG.
Final filter replacement
The final particulate filter should be replaced each time the activated carbon canister is changed. The filter is located immediately after outlet of CO catalyst canister.
- Loosen the four (4) panel screws by turning ¼ turn counterclockwise.
- Pull top panel out. Note orientation of filter so that it can be installed the same way.
- Loosen ¼” compression nuts on either end and pull filter from tubing.
- Remove nuts from old filter and place them on new filter.
- Install new filter with the standoff end (visible inside housing, supporting filter element) connected to catalyst canister outlet.
- Firmly tighten compression nuts on inlet and outlet tubing.
If unit fails to run when plugged in and turned on, first check the fuse.
- Disconnect power cord from power input module on bottom panel of unit.
- Using slotted tip screwdriver, pry up at slot located inside cord entry socket, about ¼” below surface of power input module. This will pull up fuse carrier that holds the fuse and a spare.
- Inspect fuse to see if it is blown. If so, remove it and replace it with spare fuse.
- If fuse is in good shape, re-install and plug system back in.
If unit does not work, unplug it and remove four socket head screws located on corners of bottom panel. Pull bottom panel out and inspect wiring connections to make sure they are secure. If any loose wires are evident, tighten the connection if possible. Refer to wiring schematic in Appendix B.