ETC Unison - Vacuuming out dimmer racks

Unison Station User Manual 25
Vacuuming out dimmer racks
Even in a dimmer rack with an effective air filter, air seal leaks, open door
operation and other factors will let in some dust. You should inspect your
dimmer rack when you clean the air filter and vacuum the front of the dimmer
modules if necessary.
1. Open the door and look at the modules’ air vents. If dust is thick enough
to hide the paint color, you should vacuum the front of the modules.
2. Leave the modules inside the rack . Most dust collects on the dimmer
choke vents and SCR grills of the dimmer modules. Removing modules
exposes the phase voltage buss bars inside the rack.
WARNING! Phase voltages inside the rack can be deadly. Do not remove
rack modules unless you are a qualified technician.
3. Use a narrow vacuum cleaner nozzle to remove dust from the dimmer
modules. Pay particular attention to the dimmer choke vents, the SCR
grills and the CEM grill. Do not push or blow debris into the modules or
rack interior.
4. When you are finished, close the door.
OFFOFFOFFOFF
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➂ CEM grill
➁ SCR grill
➀ Choke vent
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➁
➂