Trane 4YCC4024A1060A Installer's Manual page 15

4. When the curb and air ducts have been properly
installed, the unit is ready to be hoisted to the roof
and set in position.
I I m m p p o o r r t t a a n n t t : : To prevent damage to the sides and top of
the unit when hoisting use "spreader
bars".
I I m m p p o o r r t t a a n n t t : : The unit must be lowered into position. The
P.V.C. rubber tape on the curb flange
permits the unit to be repositioned if
required without destroying the P.V.C.
rubber seal affixed to the mounting curb.
Table 1. Vibration Isolators/Snow Feet Locations
Note: These views represent the base as
viewed looking up from underneath
the unit.
Important: Unit requires vibration isolator
support in the general areas
shown. Locate 3/4" thick
vibration isolators on the
bottom of the basepan as
illustrated by black dots for
ground level pad applications.
Modify vibration isolator
location as necessary for
frame and rail applications.
R R o o o o f f t t o o p p I I n n s s t t a a l l l l a a t t i i o o n n — — F F r r a a m m e e M M o o u u n n t t i i n n g g
For rooftop applications using field fabricated frame
and ducts use the following procedure:
1. Locate and secure the frame to the roof by bolting
or welding. Frame must provide adequate center
support via a cross member centrally located
channel rail. See Table 4, p. 17
Vibration isolators should be installed as indicated
in Table 1, p. 15, adjust as necessary for your
frame. The isolators must be placed on base pan,
not drip lip. Add flashing as required. Flashing must
conform to local building codes.
2. Prepare the hole in the roof in advance of installing
the unit.
3. Secure the horizontal or down airflow ducts to the
roof. Refer to the previous Convert from Horizontal
Airflow to Down Airflow section if conversion is
needed.
4. All fabricated outdoor ducts should be as short as
possible.
5. Place the unit on the frame.
18-EB31D1-1F-EN
Small Cabinet
****4024 - 4036
and Table 5, p. 18.
S S t t e e p p 4 4 — — U U n n i i t t I I n n s s t t a a l l l l a a t t i i o o n n
P P l l a a c c i i n n g g t t h h e e U U n n i i t t o o n n t t h h e e M M o o u u n n t t i i n n g g C C u u r r b b
1. The unit is designed with a perimeter drip lip that is
lower than the unit base pan.
2. Position the unit drip lip down over and in contact
with the outside corner of the curb.. Continue to
lower the unit on top of the curb, with the unit drip
lip astraddle, and in contact with, both the end and
side rail of the curb. The unit should now rest on
top of the curb. Use the extreme mounting kit,
BAYEXMK001A, to add additional hold down
strength to the mounting.
N N o o t t e e : : The ductwork is installed as part of the curb
installation. Do not attach ductwork to the unit
and lower the unit with ductwork onto the curb.
6. The unit must be mounted level for proper drainage
of water through the holes in the base pan.
7. Secure the unit to the frame.
8. Insulate any ductwork outside of the structure with
at least two (2) inches of insulation and then
weatherproof. There must be a weatherproof seal
where the duct enters the structure.
9. The unit should not be exposed to direct roof water
runoff.
10. Flexible duct connectors must be of a flame
retardant material. All duct work outside of the
structure must be insulated and weatherproofed in
accordance with local codes.
11. Access and service clearances for the unit must be
given careful consideration when locating the duct
entrance openings. Figures 1 to 6 provide unit
dimensions.
12. Continue with the following installation sections to
complete the installation: Ductwork, Filter, and
Electrical Wiring.
Medium Cabinet
****4042 - 4060
15