Figure 2-27 Em-9 Ducted Evaporator - Hose & Harness Routing - Carrier Transport Air Conditioning Installation Procedures Manual

2.4 EM-9 DUCTED EVAPORATOR
The EM-9 evaporator is normally located slightly
forward of the bus center on the drivers side and slightly
rear of the bus center on the passenger side. See
Figure 2-30.
To install the EM-9 ducted evaporator assembly utilize
the installation procedures outlined in Section 2.3, steps
a through r, then continue with the following steps:
NOTE
Because of the ducting that will be installed the
length of the bus, refrigerant hoses and electri-
cal harnesses can enter or exit the bus floor at
any convenient location. Hoses and harnesses
must be bundled and clamped to the bus ceiling
within the confines of the air conditioning ducts.
See Figure 2-27.
NOTE
Drain lines cannot be routed with the refrigerant
hoses and electrical harnesses as shown in
Figure 2-27. Drain lines must exit the evapora-
tor and immediately run down-hill. The drain
lines in Figure 2-27 are routed within the bus
wiring channel to the hose cover.
a Trim cover to the contour of bus ceiling. Trim around
the hose/harness cover if routed from rear of evaporator
cover. Temporarily install over evaporator assembly.
b Hold duct section against the evaporator cover,
ceiling, and wire channel (wall).
c Trace contour of duct end onto evaporator cover.
Do this on both sides of the cover.
d Cut duct tracing leaving approximately 1/4 inch on
evaporator cover. See Figure 2-27. This allows the duct
section to butt against the evaporator cover.
Figure 2-27 EM-9 Ducted Evaporator - Hose & Harness Routing
T--311
Trim Lock
Clamp
e Mark and cut the duct section when routing
hose/harness out of the ducting. Insure the hose cover
will completely cover the hole cut into the duct. See
Figure 2-29 and Figure 2-34.
f Snap a chalk line to insure duct sections are
installed straight on the ceiling and the wall.
g Starting at the evaporator, temporarily position a
duct section in place.
h Mark duct section as to where seats are located.
There should be one louver per seat.
i Using a hydraulic press or hole saw, cut 3 inch holes
where the louvers are to be located, alternating top to
bottom on all the duct sections. See Figure 2-28. Do not
install the louvers until the installation is complete.
j The rear duct sections should butt against the back
wall of the bus. The front duct sections must be capped.
Trim the end caps to fit inside the forward duct sections.
k Cut or punch a 3 inch opening in the drivers end cap
and install a louver assembly. See Figure 2-29.
l If preferred, trim evaporator, end caps, and hose
covers with trim lock.
Optional "school style ducting" is available from
Carrier Transport AC (See Figure 2-31 &
Figure 2-32). Contact the Carrier Transport Air
Conditioning Technical Service Hot Line
(1--800-450-2211) for availability.
m Clean evaporator and hose covers with a mild
cleaning solution. Clean all debris from the interior of the
bus.
n Install louvers in ducts and end cap. See
Figure 2-30 for
installation.
Tie-Wrap
Bus Wiring Channel
2--12
NOTE
a complete ducted evaporator
Clamp
Hose Cover
Change 07/09