ROOFCURB ADAPTER ACCESSORY - Installation Instructions - 7/13 Catalog No. IIK-CRADCU04-04

Oct 29, 2026

Installation instructions for a rooftop unit roofcurb adapter accessory, sized for single packaged rooftop units in the 10–25 ton range (sizes 012-028). The guide lists package contents, compatibility tables for replacing specific Carrier carrier curb models, and key limitations for certain 1993–1997 units. It provides safety considerations, general ordering and field verification requirements, and describes the adapter’s insulated, gasketed, internally transitioned design, including dimensions, weight, and air-side pressure drop data.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages4

Reading Time10 min

AccessFree to download

PACKAGE CONTENTS

SAFETY CONSIDERATIONS

GENERAL

Features

Dimensions and Weight

Table 1-Air Side Pressure Drop

INSTALLATION CONSIDERATIONS

CRADCURB004A00 CRADCURB005A00 ROOFCURB ADAPTER ACCESSORY SINGLE PACKAGE ROOFTOP UNITS SELECT 10 TO 25 TONS SIZES 012-028 Installation Instructions IMPORTANT: Read these instructions completely before attempting to install the accessory roofcurb adapter. PACKAGE CONTENTS | WHEN
REPLACING PAST
CARRIER MODEL* | USE ADAPTER
CURB | WHEN
REPLACING WITH
NEW CARRIER
MODEL | | --- | --- | --- | | 48/50DR 012-016 | CRADCURB004A00 | 48/50TC 17-28;
48/50HC 17-24;
50TCQ 17-24 | | 48/50TJ 016-028
(Except 48TJE 024,028) | | | | 48/50HJ 015-017,025 | | | | 48/50TM 016-025 | | | | 48/50 DP 012-020 | | | | 50PQ 012-016 | | | *Using curb similar to: CRRFCURB010A00 CRRFCURB011A00 | WHEN
REPLACING PAST
CARRIER MODEL* | USE ADAPTER
CURB | WHEN
REPLACING WITH
NEW CARRIER
MODEL | | --- | --- | --- | | 48/50TM 028 | CRADCURB005A00 | 48/50TC 28; 48/50HC 24 | *Using curb similar to: CRRFCURB025A00 IMPORTANT: For 48TJE 024-028 units built between 1993 and 1997 and using roofcurb 48DP900041, 48DP900051, or 48DP900061, please contact your Carrier representative. These curb adapters are not suitable. SAFETY CONSIDERATIONS Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment. Untrained personnel can perform the basic maintenance functions of replacing filter. All other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that my apply. Follow all safety codes. Wear safety glasses and work gloves. Recognize safety information. This is the safety-alert symbol ! . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies a hazard which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation. GENERAL IMPORTANT: Before ordering curb adapter, contractor must confirm that dimensions of existing curb on job site matches dimensions of existing curb in Fig. 2 and 3. IMPORTANT: Before new HVAC unit is set in place, inspect structural stability of existing curb and building’s roof load capability. Reinforce, if required. These curb adapters are designed to allow an older/existing HVAC unit tobe replaced with a newer model while using the existing unit’s roofcurb, and eliminating the need to and the liability associated with re-roofing required when a new roofcurb is set. This is accomplished by setting a curb adapter on top of the existing curb which transitions to the new unit’s footprint and support requirements. The curb adapter includes internal duct transitions to minimize field duct modifications and static pressure loss. (See Table 1.) Features • Fully assembled curb adapter. • Includes internal transitions. • Internally insulated with 1”-1.5 lbs insulation. • Gasketing package provided. Copyright 2013 Carrier Corporation ● 7310 W. Morris St. ● Indianapolis, IN 46231 Edition Date: 7/13 Catalog No. IIK-CRADCU04-04 Manufacturer reserves the right to discontinue, or change at any time, specification or designs without notice and without incurring obligations Replaces: IIK-CRADCU04-03 | | A | WEIGHT | | --- | --- | --- | | CRADCURB004A00 | 121 5/8” | 385 lbs. (175 kg) | | CRADCURB005A00 | 135 5/8” | 425 lbs. (193 kg) | Fig. 1-Roof Cur

FAQs

What should be checked before ordering the curb adapter?

Before ordering, the contractor must confirm the dimensions of the existing curb on the job site match the dimensions shown in Fig. 2 and Fig. 3.

Who should install or service the air-conditioning equipment?

Only trained and qualified service personnel should install, repair, or service the air-conditioning equipment; untrained personnel may perform only basic maintenance such as replacing the filter.

How does the roofcurb adapter affect airflow calculations?

The adapter increases the system’s external static pressure, so it must be included when calculating the unit airflow requirements.

Oct 29, 2026

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