26
Catalyst Cleaning
As debris and contaminants accumulate on the catalyst, the effectiveness of the unit decreases. The
catalyst must be inspected periodically for buildup. It is recommended that this inspection be
performed during particle filter replacement.
Catalyst Inspection 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.) Using a flashlight, visually inspect catalyst. Look for clumps of dirt and debris.
6.) If catalyst appears clean and free of particulate, the catalyst will not need to be cleaned. Proceed
to next step to reassemble. If catalyst has accumulated dirt and debris, the catalyst panel should be
cleaned. Proceed to Catalyst Cleaning Procedure.
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.