Nortel DMS-100 Series Maintenance Manual page 654

13-52 OPM routine maintenance procedures
Secondary (diffuser) filter replacement in cooling unit
OPM
(continued)
Secondary (diffuser) filter replacement in cooling unit
At the ECU
1
2
297-8361-550 Standard 04.01 September 2000
WARNING
Damage to airflow sensor blades
Turn the ECU fans OFF before you remove or insert the
secondary (diffuser) filters. Removal of these filters while the
fans are ON can damage the air flow sensor blades.
DANGER
To prevent burns to fingers or hands
Use caution when you remove ECU secondary (diffusers)
filters, because the ECU is warm when the heaters are in use.
DANGER
Rotating fan blades
Do not reach in more than 15.24 cm (6 in.) beyond the upper
lip of the air-intake grille. If you do reach in this far, your
fingers can contact the rotating blades of the cooling unit
fans.
On the environment control unit (ECU), set the fan switch to OFF.
Pull out and remove the diffuser filter. Refer to the following figure for the
location of the diffuser filter.