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Catalyst Cleaning Procedure
1.) Disconnect unit from power supply.
Note:
If the unit is powered on during cover removal, a safety switch will disconnect power.
Caution: Electrical plug must be disconnected before servicing. A break in power caused by the
safety switch is not considered disconnecting power.
2.) Remove access cover by loosening (6) screws with a Phillips-Head screwdriver.
3.) Disconnect MOLEX connectors powering catalyst panels. See Figure 7. Older models may use
wire nuts. See Figure 8. Take note of when each wire is connected. They will need to be rewired in
the same way once panel is put back into place.
4.) Remove catalyst panel. See Figure 9.
5.) If the catalyst has only light to moderated dust build up, use a hand sprayer with water only to
rinse the catalyst. Avoid heavy concentration of spray on ballast tray.
If catalyst is soiled with resin (E.T.S.) or grease, spray catalyst liberally with Nu-Calgon CalClean,
Special HD, or another suitable coil cleaner. Do not spray ballast tray. Allow to sit for 15 minutes
before rinsing with pump up water spray bottle.
Caution: Do not spray high-pressure water to clean catalyst. Excessive use of high-pressure water
will remove catalyst coating. This type of damage will void the product warranty.
6.) Allow catalyst to dry before reinserting into unit.
7.) Place catalyst panel back into DT-FP. Be sure that arrows on panel point in the direction of air
flow. See Figure 9.
Note:
Air flows through catalyst panel first, then through fan motor housing.
8.) Using MOLEX connectors or wire nuts, wire catalyst panel in the same way they were originally
wired. See Figures 7 and 8.
9.) Before reattaching cover, check to make sure that lamps operate. Reconnect unit to power and
turn on. Briefly press in safety switch with your hand or with a tool. If lamps are operating correctly, a
green glow will illuminate from green lamp sleeve.
Caution:
Exposure to UV light is dangerous. Be sure to wear proper PPE when inspecting lamps.
See page 9.
10.) Once lamp operation is verified, reattach access cover. Reinsert (6) screws and tighten with a
Phillips-Head screwdriver.