TD140 Hardware Maintenance Guide 7.13.2
41
4
TD140 Maintenance Guidelines
Rev. 001-140228
13.
Check that the PEM’s OK LED is solid green.
When all the power feeds are present, only the green OK LED is lit.
C
LEANING
OR
R
EPLACING
THE
I
NLET
A
IR
F
ILTER
Routine air filter maintenance is required to ensure the shelf operates efficiently. Depending
on your environment, you may need to change the air filter every 30 days. Do not wait longer
than 90 days to change the air filter.
Keep extra filters available for changing the inlet air filter, but ensure the supply is no more
than a year old. The ideal storage condition for the polyurethane foam is a cool, dry, dark
environment. High temperature, humidity, and ultraviolet light adversely affect the filter media.
Foam also degrades when exposed to solvents and sulfates, such as engine exhaust.
Keeping relative humidity between 40% and 80% and temperature between 4.4° C and
32.2° C (40° F to 90° F) yields an acceptable environment. Covering the filters with dark
plastic keeps the foam dry and protects it from ultraviolet light.
Cleaning the filter regularly helps ensure effective filtration and airflow. How often you perform
filter maintenance depends entirely on the platform’s environment. Some environments
require more frequent maintenance than others.
Refer to the following sections for more information:
Remove the Filter Tray and Filter
Replace the Filter and Install the Tray
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