SECTION 22: HEATING AND AIR CONDITIONING
20
PA1621 Maintenance Manual All Series | Section Revised November 2017
FIGURE 19: PASSENGER’S UNIT EVAPORATOR COIL
22332
FIGURE 20: PASSENGER’S UNIT 2–PART AIR FILTER
ACCESS PANEL H-SERIES
FIGURE 21: PASSENGER'S UNIT 2-PART AIR FILTER
H SERIES
3.4 PASSENGER’S UNIT AIR FILTER – X3
SERIES
The cabin or passengers’ section air filter is
located in the evaporator compartment above
the evaporator coil and fans (Figure 22).
MAINTENANCE
Passenger’s unit air filter
Clean or replace filter at the intervals specified
by the Lubrication And Servicing Schedule in
Section 24: LUBRICATION & SERVICING.
To clean filter, back flush with water or soapy
water, then dry with air
FIGURE 22: PASSENGERS' SECTION AIR FILTER
CAUTION
Be sure not to reverse filter upon installation.
3.5 OVERHEAD COMPARTMENT FAN AIR
FILTER
Air conditioning evaporator coils may be
installed in both overhead compartment air
systems. Only the air filters are serviceable. The
air filters are accessible from inside the
overhead compartments (Figure 23).
MAINTENANCE
At the intervals specified by the Lubrication
And Servicing Schedule in Section 24:
LUBRICATION & SERVICING, slide out the
filters, then back flush with water, dry with air
and reinstall.
For air conditioning unit, ball valves are added
on supply and return lines in the condenser
compartment. They have service port to
evacuate the A/C overhead compartment circuit.
When work has to be done on an evaporator coil
unit, it will be easier to remove it and repair it on
a bench.
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