Trane 4YCC4024A1060A Installer's Manual page 16

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
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 l l a a t t R R o o o o f f - - N N o o C C u u r r b b / / F F r r a a m m e e
For roof top applications using field fabricated ducts
and sleeper rails rather than a curb or frame, use the
following procedure:
1. Locate and secure the sleeper rails to the roof by
bolting (three (3) rails required). One on each end to
support the edges of the unit and one across the
center of the unit. The center rail must run inside
both drip lips. Vibration isolators should be
installed, adjust as necessary for your sleeper rails.
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.
Table 2. Lifting and Rigging
Base of unit
rest on top of
curb rails
16
Drip lip on
perimeter of
unit
Spreader Bars
Gasket Seal
5. Place the unit on the rails.
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 rails.
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. No exposure 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:
Ductwork, Filter and Electrical Wiring.
Drip Lip
Dimple
BAYLIFT002A
Lifting Lugs
18-EB31D1-1F-EN