Trane 4TCY4024, Installer'S Manual

                                                           Page 11

Installer’s Guide

Figure 7. Typical Ground Level Applications

Step 4—Unit Installation

 NOTE: The factory ships this unit for horizontal installation.

Ground Level Installation

To install the unit at ground level:
1.  Place the unit on a pad the size of the unit or larger.  The unit 

must be mounted level for proper drainage of water through 
the holes in the base pan. To attach the unit securely to the 
slab, use extreme mounting kit, BAYEXMK003A. 

The pad must not come in contact with the structure (see 
Figure 7). Be sure the outdoor portion of the supply and return 
air ducts are as short as possible.

Unit requires vibration support as indicated in Figure 7 below 
and in Figure 9 on page 13.

2.  Location of the unit must allow service clearance around it.  

Clearance of the unit must be given careful consideration.  
See Figures 1 to 6, pages 4-9.

NOTE: Any reduction of the unit clearances indicated in these 

illustrations may result in condenser coil starvation or the 

recirculation of warm condenser air.  Actual clearances, which 

appear to be inadequate should be reviewed with a local 

engineer.

 IMPORTANT: 

A minimum 0” clearance to combustible mate-

rial shall be maintained on air outlet duct.

3.  Attach the supply and return air ducts to the unit as explained 

in the following Ductwork Installation section.

4.  Flexible duct connectors must be of a flame retardant mate-

rial. Insulate any ductwork outside of the structure with at least 
two (2) inches of insulation and weatherproof. There must be 
a weather proof seal where the duct enters the structure.

5.  Do not expose the unit to direct roof water runoff.
6.  Seal all holes through exterior walls in accordance with local 

codes.

7.  Continue with the following installation sections to complete 

the installation: Ductwork on page 16, Filter on page 16, and 
Electrical Wiring on page 17.

Rooftop Installation -- Curb Mounting

Convert Horizontal Airflow to Down Airflow

The factory ships the unit  for horizontal airflow.  Perform  this 
procedure to convert it to down airflow:

1.  Remove the three (3) sheet metal screws securing the supply 
air cover and the four (4) sheet metal screws securing the return 
air cover from the base of the unit. Remove the covers from the 
base. See Figure 8, page 12.

2.  Place the covers over the horizontal supply and return open-
ings (painted side out). Align the screw holes, and secure using 
the same screws removed in step 1.

Install Full Perimeter Roof Mounting Curb

1.  Verify that the roof mounting curb is correct for the unit. There 
are two curbs depending on the unit cabinet sizes: 

    • 

4TC*3018 through 4TC*3036 use model BAYCURB050A.

    • 

4TC*3042 through 4TC*3060 use model BAYCURB051A.

2. Assemble and install the curb following the instructions in the 
     Installer's Guide included with the appropriate curb.  

SIDING

RETURN 
AIR 
DUCT

SUP-
PLY AIR 
DUCT

EXTERIOR 
WALL

INSULATE WEATH-
ERPROOF OR RAIN 
SHIELD

FLEXIBLE DUCT 
CONNECTORS

ISOLATORS 1 PER COR-
NER AND 1 UNDER UNIT 
CONTROL BOX

SUPPORT PAD FOUNDA-
TION

OUTDOOR AIR DIS-
CHARGE

NOTE

: Use the extreme 

mounting kit, BAYEXM-
K002AA, to secure the unit to 
the slab.