Trane 4YCY4024, Installer'S Manual

Page: 13 / 28

Page 13
Installer’s Guide
Rooftop Installation -- Frame Mounting
For roof top 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 mem-
ber centrally located channel rail. See Figures 12 and 13 on
page 15. Vibration isolators should be installed as indicated in
Figure 9, 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 on page 11, if conversion is needed.
4. All fabricated outdoor ducts should be as short as possible.
5. Place the unit on the frame. Refer to Figures 12 or 13 on page
15.
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 care-
ful consideration when locating the duct entrance openings.
Figures 1 to 6, on pages 4-9, provide unit dimensions.
12. Continue with the following installation sections to complete
the installation: Ductwork on page 16, Gas Piping on page 17,
Filter on page 19, and Electrical Wiring on page 19.
Figure 9. Vibration Isolators/Snow Feet Locations
Small Cabinet
*****018-036
Medium Cabinet
*****042-060
Rooftop Installation -- Flat Roof - No Curb/Frame
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. Three (3) sleeper
rails are 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
as indicated on Figure 9, 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 on page 11, if conversion is needed.
4. All fabricated outdoor ducts should be as short as possible.
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. 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 care-
ful consideration when locating the duct entrance openings.
Figures 1 to 6, on pages 4-9, provide unit dimensions.
12. Continue with the following installation sections to complete
the installation: Ductwork on page 16, Gas Piping on page 17,
Filter on page 19, and Electrical Wiring on page 19.
IMPORTANT: Unit requires vibration isolator supports 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.
NOTE: These views represent the base as viewed looking up from underneath the unit.