Carrier 48TC**16 User Manual

Page 8

Positioning on Curb —

For full perimeter curbs CRRFCURB074A00 and 075A00,

the clearance between the roof curb and the front and rear

base rails should be

in (6.4 mm). The clearance between

the curb and the end base rails should be

in (13 mm). For

retrofit applications with curbs CRRFCURB003A01 and

4A01, the unit should be position as shown in Fig. 6.

Maintain the 15.5 in (394 mm) and 8

in (220 mm)

clearances and allow the 22

in (567 mm) dimension to

float if necessary.

C10003

Fig. 6 -- Retrofit Installation Dimensions

If the alternative condensate drain location through the

bottom of the unit is used in conjunction with a retrofit

curb, the hole in the curb must be moved 12.5 in (320

mm) towards the duct end of the unit. (See Fig. 7.)

Original
Position

New Position
(moved 12.5 in.)

C10904

Fig. 7 -- Alternative Condensate Drain Hole Positions

Although unit is weatherproof, guard against water from

higher level runoff and overhangs.

IMPORTANT:
If the unit has the factory--installed Thru--the--Base

option, make sure to complete installation of the option

before placing the unit on the roof curb.

See the following sections:

Factory--Option Thru--Base Connections
(Gas Connection) on page 11

Factory--Option Thru--Base Connections
(Electrical Connections) on page 17

NOTE: If gas and/or electrical connections are not
going to occur at this time, tape or otherwise cover the

fittings so that moisture does not get into the building or
conduit in the interim.

Remove all shipping materials and top skid. Remove extra

center post from the condenser end of the unit so that the

condenser end of the unit matches Figs. 26 and 27.

Recycle or dispose of all shipping materials.

Step 7 — Convert to Horizontal and Connect

Ductwork (when required)

Unit is shipped in the vertical duct configuration. Unit

without factory--installed economizer or return air smoke

detector option may be field--converted to horizontal ducted

configuration using accessory CRDUCTCV001A00. To

convert to horizontal configuration, remove screws from side

duct opening covers and remove covers.

Discard the supply duct cover. Install accessory

CRDUCTCV001A00 to cover the vertical supply duct

opening. Use the return duct cover removed from the end

panel to cover the vertical return duct opening.

Field--supplied flanges should be attached to horizontal

duct openings and all ductwork should be secured to the

flanges. Insulate and weatherproof all external ductwork,

joints, and roof or building openings with counter flashing

and mastic in accordance with applicable codes.

Do not cover or obscure visibility to the unit’s informative

data plate when insulating horizontal ductwork.

C06108

Fig. 8 -- Horizontal Conversion Panels

48TC

**16