Carrier WeatherExpert 48N4 User manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480128-01 Printed in U.S.A. Form 48N-9SI Pg 1 10-16 Replaces: New
Installation Instructions
Part No. CRFLUEDS009A00, CRFLUEDS010A00
TABLE OF CONTENTS
PACKAGE CONTENTS . . . . . . . . . . . . . . . . . . .. . . . . 1
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
PACKAGE CONTENTS
MODEL USAGE
NOTE: The asterisk is used as a wild card for characters and numbers.
GENERAL
This installation instruction contains installation informa-
tion for the Applied Rooftop unit, N Series (ART-N) chimney.
The chimney is installed for better control of exhaust gas flow
and to prevent exhaust gas recirculation into the unit.
SAFETY CONSIDERATIONS
Installation of this accessory can be hazardous due to sys-
tem pressures, electrical components, and equipment location
(such as a roof or elevated structure).
Only trained, qualified installers and service technicians
should install, start up, and service this equipment.
When installing this accessory, observe precautions in the
literature, labels attached to the equipment, and any other safe-
ty precautions that apply.
• Follow all safety codes.
• Wear safety glasses and work gloves.
• Use care in handling and installing this accessory.
Recognize safety information. This is the safety-alert sym-
bol . When you see this symbol on the unit and in instruc-
tions 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 haz-
ard 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 installa-
tion, reliability, or operation.
IMPORTANT: Read these instructions completely
before attempting to install this accessory.
ACCESSORY
PACKAGE NO. QTY DESCRIPTION
CRFLUEDS009A00
1 Chimney (Btm)
1 Chimney (Top)
1 Bracket Panel (L)
1BracketPanel(R)
2 Transition Duct Assy
1 Installation Instruction
1Gasket
1 Bag of 36 Screws
CRFLUEDS010A00
1 Chimney (Btm)
1 Chimney (Mid)
1 Chimney (Top)
1 Bracket Panel (L)
1BracketPanel(R)
2 Transition Duct Assy
1 Installation Instruction
2Gasket
1 Bag of 42 Screws
ACCESSORY PART NUMBER USAGE
CRFLUEDS009A00 48N**N*, 48N**P*, 48N**Q*
CRFLUEDS010A00 48N**R*, 48N**S*, 48N**T*
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury and/or death.
Before beginning any modification, be certain that the
main-line electrical disconnect switch is in the OFF posi-
tion. Close the main gas supply shutoff valve. Tag discon-
nect switch and gas valve with suitable warning labels.
CAUTION
CUT HAZARD
Failure to follow this caution may result in personal in-
jury. Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety glass-
es and gloves when handling parts and servicing furnaces.
48N2,N3,N4,N5,N6,N7,N8,N9
Gas Heat Chimney Accessory

2
INSTALLATION
The number of openings on the chimney differs based on
the chassis and heat size; see Fig. 1 and 2 for schematics.
1. Determine the chassis size of the unit:
a. 75 to 105 ton cooling capacity is considered small
chassis
b. 120 to 150 ton cooling capacity is considered large
chassis
2. Determine the heat capacity of the unit:
a. For small chassis:
• 800,000 Btu/hr is low heat
• 1,200,000 Btu/hr is medium heat
• 1,520,000 and 1,600,000 Btu/hr are high heat
b. For large chassis:
• 1,200,000 Btu/hr is low heat
• 1,600,000 Btu/hr is medium heat
• 2,000,000 Btu/hr is high heat
3. The chimney for each chassis size comes pre-assembled
for low heat furnace. Remove the block-off plate to adjust
the chimney to the heat size of the unit. See Fig. 1 and 2
to determine how many block-off plates must be re-
moved.
4. Replace the removed block-off plates with the transition
duct. See Fig. 3.
5. Remove all flue exhaust hoods (Fig. 4) from the unit skin.
6. Install both long brackets on both sides of the flue exhaust
duct on the unit skin. Make sure the screw holes on the
bracket align with the screw holes on the unit skin. Note
that the flat side of the bracket is the lower side of the
bracket. See Fig. 5-10.
Fig. 1 — Openings and Block-off Plates
Arrangement for Small Chassis Unit
BLOCK-OFF
PLATE
OPENING
LOW HEAT HIGH HEATMEDIUM HEAT
Fig. 2 — Openings and Block-off Plates
Arrangement for Large Chassis Unit
BLOCK-OFF
PLATE
OPENING
LOW HEAT MEDIUM HEAT HIGH HEAT
Fig. 3 — Transition Duct
A48-8942
Fig. 4 — Flue Exhaust Hood
A48-8943

3
Fig. 5 — Bracket Installation
A48-8944
FIRST BRACKET INSTALLED
Fig. 6 — Location of First Installed Bracket in
Relation to Flue Exhaust Duct
FLUE EXHAUST
BRACKET
A48-8945
Fig. 7 — First Installed Bracket Viewed
from Other Side
BRACKET
A48-8946
Fig. 8 — Bracket Correctly Installed with
Flat Part on Lower Side
FLAT SIDE
OF BRACKET
A48-8947

4
7. After both brackets are installed, as shown in Fig. 5-10,
install the bottom piece of the chimney (Fig. 11).
The chimney is shipped in 2 pieces for the small chassis
and 3 pieces for the large chassis.
Be sure the sides of the transition ducts encompass the
flue gas exhaust sides as shown in Fig. 12.
8. Use screws (provided) to attach the bracket to the
chimney (Fig. 13).
Fig. 9 — Bracket Correctly Installed with
Cutout on Upper Side
A48-8948
CUTOUT PART
OF BRACKET
Fig. 10 — Installation of Second
Supporting Bracket
SECOND
BRACKET
A48-8949
IMPORTANT: To guard against leakage, verify there
are no unfilled screw holes.
Fig. 11 — Installation of Bottom Piece
BOTTOM
PIECE
A48-8950
Fig. 12 — Correct Alignment of Transition Duct
with Flue Exhaust Duct
TRANSITION
DUCT
HOLE
FLUE
EXHAUST
DUCT
A48-8951

5
9. Place the white gasket over the top flange of the bottom
piece of the chimney (Fig. 13). When installed correctly,
this gasket prevents leakage between chimney pieces. Be
sure the gasket is not moved during the installation of the
top piece. The white gasket must not protrude; it should
be flush with the main body of the chimney. See Fig. 14
for correct installation.
10. Install the top piece for the small chassis or the middle
piece for the large chassis.
Small chassis: stack the top piece over the bottom piece
and secure it to the bracket with screws. For the small
chassis, this will be the last piece for installation. The top
piece always has the deflector assembly pre-installed
(Fig. 15).
Large chassis: stack the middle piece over the bottom
piece and secure it to the bracket with screws (Fig. 16):
IMPORTANT: Newer gaskets (not shown) are perfo-
rated with slots for condensate drainage. These gaskets
must be installed by aligning gasket slots with flange
holes.
Fig. 13 — Example of Typical Gasket (Without
Condensate Drainage Perforations)
GASKET
A48-8952
Fig. 14 — Bottom Piece after Installation
BOTTOM
PIECE,
INSTALLED
A48-8953
Fig. 15 — Deflector Assembly
A48-8954
Fig. 16 — Middle Piece after Installation
MIDDLE
PIECE,
INSTALLED
A48-8955

6
11. For the large chassis, after the middle piece is installed
and secured with screws to the bracket, place the white
gasket over the top flange of the bottom piece of the
chimney (Fig. 17). When installed correctly, this gasket
prevents leakage between chimney pieces. Be sure the
gasket is not moved during the installation of the top
piece. The white gasket must not protrude; it should be
flush with the main body of the chimney. See Fig. 14 for
correct installation.
12. For the chimney for the large chassis unit, once the sec-
ond gasket is placed over the middle chimney piece, in-
stall the top piece of the chimney. See Fig. 18. The height
and weight of the top piece for the large chassis require
careful attention during installation.
13. Once the installation is complete (Fig. 19), verify:
a. All gaskets are flush with the main body of the
chimney.
b. The bracket is straight and there are no ripples or
waves on the brackets; the bracket is flush with the
chimney body.
c.
MAINTENANCE
Inspect screens on bottom chimney piece and on deflector
assembly and remove any debris to ensure proper airflow and
heating efficiency. Inspect full length of flue stack for any
blockages which could impair flue performance. Inspect every
fall, and periodically during heating season.
IMPORTANT: Newer gaskets (not shown) are perfo-
rated with slots for condensate drainage. These gaskets
must be installed by aligning gasket slots with flange
holes.
Fig. 17 — Example of Typical Second Gasket for
Large Chassis (Without Condensate Drainage
Perforations)
GASKET
BETWEEN
TOP AND
MIDDLE
PIECESA48-8956
Fig. 18 — Top Piece for Large and Small Chassis
TOP PIECE
WITH DEFLECTOR
ASSEMBLY
A48-8957
Fig. 19 — Large Chassis 3-Piece Chimney
A48-8958

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480128-01 Printed in U.S.A. Form 48N-9SI Pg 8 10-16 Replaces: New
© Carrier Corporation 2016