Evaporator Hose Routing, Side-Mounted - Carrier Transport Air Conditioning Installation Procedures Manual

Always keep hose capped until ready to connect to a
system component (See Figure 4--5).
1. Determine which side of the vehicle the hoses
should be routed; the drivers side or passenger side.
2. Determine what route the hoses will take. Take into
consideration there are going to be obstacles that
the hoses may have to be routed around, such as
seats, wheelchair lifts, windows, etc.
3. Lay out the hose cover backs in the position that they
eventually will be installed, and mark their position.
Mark the sides and where they stop at the floor and
wall. This will give you an outline where the holes for
the hoses should be placed.
Before drilling holes for the hoses in the wall or through
the floor, make sure there are no electrical harnesses,
braces, etc. in the path of the hose routing and hole saw.
4. Drill a 3/16 inch pilot hole in the center of where you
are going to drill the two 1 1/2 inch holes. This will
show you if you can safely cut the two 1 1/2 inch
holes in the floor.
5. Drill two 1-1/2 inch holes side by side within the hose
cover markings.
6. Saw out any material remaining between the two
holes, leaving an oblong hole to route the hoses
through.
7. Repeat steps 1. through 6. to obtain access to the
wall or floor, depending which one you start with.
8. Remove any sharp edges from around the holes to
prevent hose cutting and/or chaffing.
9. After holes are drilled, sawed and deburred, you are
ready to mount the hose cover backs using a com-
mon fastener such as screws, pop rivets, etc.
When drilling into the vehicle wall, always use a drill stop
to help protect against damaging any wiring that might
be located behind the wall.
To help keep hoses, harness, and drain lines secure and
in the center of the hose covers, 3/16 inch holes can be
drilled in the hose cover backs. Insert Tie-Wraps
through the holes before securing the hose cover backs
to the wall (See Figure 4--21) .
10.Drill a 3 inch hole in the vehicle wall in order to rout
the hoses and harness to the evaporator area.
11. Remove (deburr) any rough edges from around the
cut-out.
12.Using a small piece of "Trim-Loc" or similar material
around the cut-out will help protect the hoses and
harness from chaffing and/or cutting. See xxxx
13.Route the hoses and harness at this time.
14.Before fastening to the hose cover backs, protect the
hoses and harness wherever they go through the
floor or wall. A piece of scrap drain hose or heater
hose, split down the middle, can be used for protec-
tion.
15.After hoses and harness are protected, secure them
to the hose cover backs with the Tie-Wraps.
At this time the evaporator can be mounted. See
Section 2 for the proper procedures for installing a rear
mounted evaporator assembly.
16.You may now make the appropriate connection to
the evaporator.
Proper hose to fitting clamping is critical. Do not attempt
to attach any hose or fitting until you have familiarized
yourself with Carrier Transport AC's Quick-Click
hose/fitting crimping procedures.
4.5 EVAPORATOR HOSE ROUTING, SIDE-
MOUNTED
The side-mounted evaporator should be installed in the
desired location. Refer to Section 2 for proper
procedures for installing a side-mounted evaporator
assembly.
1. Always keep hose capped until ready to connect to a
system component.
Side mount hose cover kits are supplied with 45 degree
angle pieces and a transition to aid in routing hoses and
harnesse down the side of the bus/vehicle.
2. Select a window post nearest the evaporator to route
the hoses down. In most cases hoses will need to be
routed around seats, emergency exits, etc. Use the
45 degree angles to obtain the proper clearance.
3. Lay out the hose cover backs in the position they will
eventually be installed.
Take extra precaution when routing hoses to a side
mounted evaporator. You are restricted to a limited
amount of space to route the hose. Make sure the hoses
do not bend to the point of kinking the hose. This would
result in poor system performance and/or failure.
4. Mark where the hose cover back meet the evapora-
tor and the floor. This will give you an outline where
the holes for the hoses should be placed.
Before drilling holes for the hoses in the wall or through
the floor, make sure there are no electrical harnesses,
braces, heater lines, etc. in the path of the hose routing
and hole saw.
On many of the larger buses there are heater hose lines
with covers running the length of the bus floor. On most
applications there is enough room inside the heater
hose covers to route the hose, harness, and drain line
behind the heater hose. Extreme care must be taken so
as not to drill into, cut, or kink the heater lines. This type
routing takes a little more time, but makes for a much
neater installation.
5. Drill a 3/16 inch pilot hole in the center of where you
are going to drill the two 1 1/2 inch holes through the
floor. This will show you if you can safely cut the two 1
1/2 inch holes through the floor.
6. Drill the two 1-1/2 inch holes side by side within the
hose cover markings.
7. Saw out any material remaining between the two
holes, leaving an oblong hole to route the hoses
through.
8. Remove any sharp edges from around the holes to
prevent hose cutting and/or chaffing.
9. After holes are drilled, sawed and deburred, you are
ready to mount the hose cover backs using a com-
mon fastener such as screws, pop rivets, etc.
When drilling into the vehicle wall, always use a drill stop
to help protect against damaging any wiring that might
be located behind the wall.
4--7
T--311