RD-2-7783 (REV. A) Page 2SUBJECT TO CHANGE WITHOUT NOTICE
1. Remove the headliner or loosen enough to drop the center portion. (Disregard if no headliner).
2. Determine the most suitable location for mounting the air conditioning unit.
a. Mark the front-to-rear centerline of the cab on the outside of the cab roof.
b. Place the mounting template on the roof using the centerline as a guide.
c. Consider position of horns and marker lights.
d. Ensure that air flow to the unit is not obstructed.
e. Do not mount the unit with the front lower than the rear, as this will prohibit water drainage.
f. Avoid cutting roof stiffeners if possible. If stiffeners are cut or roof is weakened due to the cutout, reinforcement may
be required.
g. A Mounting Channel Kit No. RD-2-1302-0 is available if it is necessary to reduce the bolt spacing width. The minimum
recommended spacing width is 14 inches to ensure proper support. The channels bolt directly to the unit and either
one large or two tapered rubber spacers are used to space the unit away from the roof. See Figures 1 and 2.
3. Tape the template to the roof at the desired location. Mark the mounting hole location and the roof cut-out area (punch or
scribe the roof).
4. Cut the roof where marked and drill the mounting holes 1/2". Remove burrs and sharp edges.
5. Temporarily install the headliner and trace the cut-out onto it from the roof. Remove the headliner and cut out the area
marked. Use caution and do not cut headliner opening larger than roof opening (check against template if in doubt).
6. Should roof reinforcing be required, fabricate and install at this time.
7. Clean the outside roof area around the cut-out and mounting holes using a mild solvent.
8. Apply a thin film of adhesive 1”wide around upper surface of roof cut-out and mounting holes. Apply sealer to the face of
the sealing ring on the unit. See Figure 1. Make sure that the drain tube is located within the sealing ring. A wire or string
may be wrapped around sealing ring to keep it in place if necessary.
9. Set unit on cab. Make sure that drain tube is not pinched and roof brace is installed, if required.
10. Select spacers as required to level and support unit. See Figure 2.
11. Apply adhesive to the faces of all spacers and locate over mounting holes.
12. Tighten the four cap screws provided evenly until the spacers take the load and just begin to “bulge" slightly. Do not over-
tighten. Bottom of unit and roof may distort and cause water leakage.
13. Remove cover and install (4) 3/8 - 16 nuts on mounting cap screws to prevent them from backing out. Apply sealant
around bolt threads and nut plates to prevent water leakage into cab.
