Carrier | 50PG03-16 | Installation Instructions

48/50PG03-16
Single-Package Rooftop Units
Roof Curb Adapter Accessory
Installation Instructions
Part Numbers: CRADCURB001A00, CRADCURB002A00, CRADCURB003A00
PACKAGE USAGE
EXISTING ROOFTOP UNIT
48/50DJ,HJ,TF,TFF,TJ,TM004-007
50HJQ,TFQ004-007
48/50DJ,HJ,TF,TFF,TJ,TM008-014
50HJQ,TFQ008-012
48/50HJ015-017
48/50TJ,TM016-028
50HJQ014,016
EXISTING ROOF CURB
CRRFCURB001A00, or
CRRFCURB002A00, or
CRRFCURB022A00*
CRRBCURB003A00, or
CRRFCURB004A00, or
CRRFCURB023A00*
CRRFCURB010A00 or
CRRFCURB011A00
ADAPTER CURB USAGE
RETROFIT UNIT
CRADCURB001A00
48/50PG03-07
CRADCURB002A00
48/50PG08-14
CRADCURB003A00
48/50PG16
*Roof curbs CRRFCURB022A00 and CRRFCURB023A00 are COBRA™ full perimeter roof curbs. The accessory roof curb adapters will work with
these curbs.
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 filters. All other operations should be
performed by trained service personnel. When working on airconditioning equipment, observe precautions in the literature,
tags and labels attached to the unit, and other safety precautions
that may apply.
GENERAL
The accessory roof curb adapter is used when retrofitting a
48/50PG unit onto an existing Carrier roof curb. The roof curb
adapter mounts on existing DJ, HJ, TF, TJ, TM roof curbs to
allow the installation of a 48/50PG unit onto the existing curb.
INSTALLATION
To prevent injuries and rain damage, do not leave roof
opening uncovered. If unit installation is not completed
immediately after adapter curb is installed, provide an adequate temporary cover for the roof opening.
3. Turn off all gas to the existing unit (if applicable). Shut
off electric power and install lockout tag.
4. Remove existing electrical connections from existing
unit.
5. If existing unit is a gas heat unit, remove gas connection
from existing unit.
6. Some installations may have the existing ductwork attached to the unit instead of the roof curb. If this is the
case, unattach the ductwork from the unit and attach ductwork to roof curb.
7. Remove the existing HVAC unit from the roof.
8. Reinforce the existing roof curb and roof structure as
required.
9. Install sealing gasket on the top of the curb and duct openings. When installed, the weight of the accessory roof curb
adapter will compress the gasket to seal the joint between
the accessory and the existing curb. Gasket strips must fit
tightly together to leave no gaps for leakage.
IMPORTANT: Gasketing is critical for water integrity.
Improperly installed gasketing can result in air leaks and
poor unit performance.
Table 1 — Accessory Adapter Curb
Pressure Drop (in. wg)
ACCESSORY
Follow all local, state, and other applicable codes when
installing the accessory roof curb adapters.
NOTE: All accessory roof curb adapters increase the external
static pressure. The added static pressure must be included
when calculating system requirements. See Table 1.
1. The accessory roof curb adapters have been designed to
fit existing Carrier roof curbs. Before installing, check to
ensure that the dimensions on the existing curb match the
dimensions shown in Fig. 1.
2. Make sure the existing curb and roof structure are capable
of supporting the accessory roof curb adapter and unit.
The adapter curb and unit together will weigh more than
the existing unit.
CRADCURB001A00
CRADCURB002A00
CRADCURB003A00
UNIT
48/50PG03
48/50PG04
48/50PG05
48/50PG06
48/50PG07
48/50PG08
48/50PG09
48/50PG12
48/50PG14
48/50PG16
PRESSURE DROP
(at 400 cfm/ton)
0.12
0.16
0.21
0.27
0.32
0.18
0.22
0.28
0.36
0.21
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 534-80246
Printed in U.S.A.
Form 48/50PG-22SI
Pg 1
8-05
Replaces: New
Book 1 1 4 4
Tab 1a 1b 6a 6b
GAS SERVICE
PLATE
1 - 4 3/16
[427]
(INSIDE)
0-6
[152]
(INSIDE)
0 - 7 1/16
[179]
(INSIDE)
TYP
2 3/8
[61]
1-2
[356]
OR
2-0
[610]
5 - 7 1/8
[1705]
3 - 0 15/16
[938]
1 - 8 3/16
[513]
(INSIDE)
GAS SERVICE
PLATE
0 - 4 5/16
[110]
(INSIDE)
3 TO 6 TON UNITS
TYP
2 3/8
[61]
1 - 8 3/16
[513]
(INSIDE)
0 - 2 15/16
[75]
1-2
[356]
OR
2-0
[610]
6-6
[1981]
7 to 121/2 TON UNITS
4 - 1 3/4
[1264]
5 -10 1/2
(1791)
SUPPLY
COMPR
OPENING
SECT.
CURB
PLAIN VIEW OF ROOF CURB
OUTLINE OF UNIT
RETURN
OPENING
CURB
6 -2 3/16
(1885)
(REF SUPPLY OPENING)
5 -9
(1753)
0 - 1/4
0 -5 3/16
(132)
1- 0
(305)
1 -1 15/16
(349)
1 -7 13/16
(504)
15 TON UNITS
1 -13/16
(310)
1 -10 3/4
(578)
Fig. 1 — Existing DJ, HJ, TF, TJ, TM Roof Curb Dimensions
2
10. Set the accessory curb adapter on top of the existing curb.
Make sure openings in accessory adapter curb line up
with the openings in existing roof curb and there is a tight
seal. See Fig. 2 and 3.
11. Secure the accessory adapter to the existing roof curb
using field-supplied fasteners.
12. Install sealing gasket on the top of the accessory adapter
curb and duct openings. When installed, the weight of the
unit will compress the gasket to seal the joint between the
accessory and the unit. Gasket strips must fit tightly
together to leave no gaps for leakage.
13. Make all necessary gas and electrical connections.
14. Set 48/50PG unit on top of accessory adapter curb. Refer
to 48/50PG installation instructions for information on
mounting the unit.
INSULATED DECKS
C
A
B
20"
RETURN OPENING IN BOTTOM
CURB ADAPTOR
SUPPLY TRANSITION
CRADCURB
001A00
002A00
DIMENSIONS (in.)
A
B
C
833/4
345/8
483/16
961/4
451/2
573/16
Fig. 2 — Curb Adapter — CRADCURB001A00 and 002A00
3
87 7/16"
106 3/4"
79 1/4"
72"
106 1/4"
87.46"
41 3/4"
14"
10"
24 1/4"
LEGEND
RA — Return Air
SA — Supply Air
Fig. 3 — Curb Adapter — CRADCURB003A00
Copyright 2005 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 534-80246
Printed in U.S.A.
Form 48/50PG-22SI
Pg 4
8-05
Replaces: New
Book 1 1 4 4
Tab 1a 1b 6a 6b
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