Carrier WeatherExpert 48N2 User manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480121-01 Printed in U.S.A. Form 48N-8SI Pg 1 10-16 Replaces: 48N-7SI
Installation Instructions
CONTENTS
Page
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . .1,2
ACOUSTICAL CONSIDERATIONS . . . . . . . . . . . . . . .2,3
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Acoustic Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37
Step 1 — Perform Jobsite Survey . . . . . . . . . . . . . . . . 3
Step 2 — Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 3 — Roof Mount Unit. . . . . . . . . . . . . . . . . . . . . . . . 3
Step 4 — Slab Mount Unit . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 5 — Install Curb Gasketing . . . . . . . . . . . . . . . . 15
Step 6 — Install Field-Fabricated Ductwork . . . . . 15
Step 7 — Rig Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Step 8 — Connect Condensate Drain. . . . . . . . . . . . 15
Step 9 — Install Outdoor Hoods. . . . . . . . . . . . . . . . . 24
Step 10 — Route Field Wiring . . . . . . . . . . . . . . . . . . . 25
Step 11 — Make Field Electrical Connections . . . 26
Step 12 — Connect Air Pressure Tubing . . . . . . . . 28
• VARIABLE FREQUENCY DRIVE
• POWER EXHAUST
•RETURNFAN
Step 13 — Remove Supply-Fan Shipping
Bracket Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Step 14 — Remove Power Exhaust Shipping
Bracket Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Step 15 — Remove Optional Return-Fan
Shipping Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Step 16 — Connect Gas Piping. . . . . . . . . . . . . . . . . . 30
Step 17 — Configure Optional Modulating Gas
Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Step 18 — Install Flue/Inlet Hoods . . . . . . . . . . . . . . 31
Step 19 — Install Supply-Air Thermistors . . . . . . . 32
Step 20 — Install Unit Accessories. . . . . . . . . . . . . . 32
Two-Piece Unit Fit Up . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
CONTROLS INSTALLATION. . . . . . . . . . . . . . . . . . 37-49
Constant Volume (CV)/Staged Air Volume
(SAV) Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
• CONTROL WIRING
Variable Air Volume (VAV) Units . . . . . . . . . . . . . . . . 38
Option and Accessory Control Wiring. . . . . . . . . . . 38
Carrier Comfort Network®(CCN) Interface . . . . . . 44
Optional UPC Open Installation . . . . . . . . . . . . . . . . . 44
Smoke Control Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 46
GENERAL
This installation instruction contains basic unit installation
information, including installation of thermostats and remote
temperature sensors.
For additional information and service instructions, refer to
the Controls, Start-Up, Operation, Service and Troubleshooting
literature.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance func-
tions of cleaning coils and filters and replacing filters. All
other operations should be performed by trained service per-
sonnel. When working on air-conditioning equipment, observe
precautions in the literature, tags and labels attached to the unit,
and other safety precautions that may apply.
Follow all safety codes, including ANSI (American Nation-
al Standards Institute) Z223.1. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguisher available for all brazing operations.
WARNING
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance. Do not touch any electrical
switch; do not use any phone in your building. Immediately
call your gas supplier from a neighbor’s phone. Follow the
gas supplier’s instructions. If you cannot reach your gas sup-
plier, call the fire department.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
WARNING
Improper installation, adjustment, alteration, service, or
maintenance can cause injury or property damage. Refer to
this manual. For assistance or additional information, con-
sult a qualified installer, service agency, or the gas supplier.
CAUTION
Disconnect gas piping from units when leak testing at pres-
sures greater than 0.5 psig. Pressures greater than 0.5 psig
will cause gas valve damage resulting in a hazardous
condition. If gas valve is subjected to pressure greater than
0.5 psig, it must be replaced. When pressure testing field-
supplied gas piping at pressures of 0.5 psig or less, the unit
connected to such piping must be isolated by manually
closing the gas valve.
WeatherExpert®
48N2,N3,N4,N5,N6,N7,N8,N9
Packaged Rooftop Cooling Units with Gas Heat and
ComfortLink Controls

2
ACOUSTICAL CONSIDERATIONS
In order to minimize sound transmitted to the space, please
conform to the following recommendations (see Fig. 1):
Location
• Avoid locating the unit above sound-sensitive areas.
Instead, locate the unit above restrooms, storage areas,
corridors, or other noise-tolerant areas.
• Avoid mounting the unit in the middle of large roof
expanses between vertical supports. This will minimize
the phenomenon known as roof bounce.
• Install the units close to vertical roof supports (columns
or load bearing walls).
• Locate the units at least 25 feet away from critical areas.
If this is not possible, the ductwork and ceiling structure
should be acoustically treated.
• Consider the use of vibration isolators or an acoustic curb.
Ductwork
• Utilize flexible connectors between the unit and the sup-
ply and return ducts.
• Supply and return air main trunk ducts should be located
over hallways and/or public areas.
• Provide trailing edge turning vanes in ductwork elbows
and tees to reduce air turbulence.
• Make the ductwork as stiff as possible.
• Use round duct wherever possible because it is less noisy.
• Seal all penetrations around ductwork entering the space.
• Make sure that ceiling and wall contractors do not attach
hangers or supports to ductwork.
• Provide as smooth and gradual transition as possible when
connecting the rooftop unit discharge to the supply duct.
• If a ceiling plenum return is utilized, provide a return
elbow or tee to eliminate line-of-sight noise to the space.
Face the entrance of the return duct away from other
adjacent units.
Acoustic Insulation
• Provide acoustic interior lining for first 20 feet of supply
and return duct or until the first elbow is encountered.
The elbow prevents line-of-sight transmission in the sup-
ply and return ducts.
• Install a double layer of 2-in. low density quilted fiber-
glass acoustical pad with a 1/8-in. barium-loaded vinyl
facing on top of the roof deck before building insulation
and roofing installation occur. Place the material inside
the curb and for 4 to 8 ft beyond the unit perimeter,
dependent upon unit size (larger units require a wider
apron outside the curb). Openings in the pad should only
be large enough for the supply and return ducts. An alter-
nate approach is to use two layers of gypsum board with
staggered seams in addition to the acoustical pad.
WARNING
DO NOT USE TORCH to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective gloves and gog-
gles and proceed as follows:
a. Shut off electrical power to unit.
b. Recover refrigerant to relieve all pressure from sys-
tem using both high-pressure and low pressure ports.
c. Traces of vapor should be displaced with nitrogen
and the work area should be well ventilated. Refrig-
erant in contact with an open flame produces toxic
gases.
d. Cut component connection tubing with tubing cutter
and remove component from unit. Use a pan to catch
any oil that may come out of the lines and as a gage
for how much oil to add to the system.
e. Carefully unsweat remaining tubing stubs when nec-
essary. Oil can ignite when exposed to torch flame.
Failure to follow these procedures may result in personal
injury or death.
CAUTION
DO NOT re-use compressor oil or any oil that has been
exposed to the atmosphere. Dispose of oil per local codes
and regulations. DO NOT leave refrigerant system open to
air any longer than the actual time required to service the
equipment. Seal circuits being serviced and charge with
dry nitrogen to prevent oil contamination when timely
repairs cannot be completed. Failure to follow these proce-
dures may result in damage to equipment.

3
INSTALLATION
Step 1 — Perform Jobsite Survey — Complete
the following checks before installation.
1. Consult local building codes and the NEC (National
Electrical Code) (ANSI/NFPA [American National Stan-
dards Institute/National Fire Protection Association] 70)
for special installation requirements.
2. Determine unit location (from project plans) or select unit
location. Refer to Acoustical Considerations section.
3. Check for possible overhead obstructions which may in-
terfere with unit lifting or rigging.
Step 2 — Place Unit — Inspect unit for transportation
damage. If any damage is found, file a claim with the transpor-
tation agency.
Provide clearance around and above unit for airflow, safety,
and service access. Do not restrict top (area above condenser
fans) in any way. Allow at least 6 ft on all sides for rated perfor-
mance, code compliance, and service. On units equipped with
power exhaust option, high velocity air is exhausted out the
hood. Unit should be positioned with at least 10 ft clearance be-
tween the exhaust hood and any obstruction. See Fig. 2 for
multiple unit minimum separation. See Tables 1-6 for addition-
al unit and fan data.
Check unit dimensional drawings on pages 19-23 for unit
arrangement and minimum performance and service
clearances.
Do not install unit in an indoor location. Do not locate air in-
lets near exhaust vents or other sources of contaminated air.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Level by using unit frame as a reference.
Step 3 — Roof Mount Unit — Check building codes
for weight distribution requirements. Refer to Acoustical Con-
siderations section. Unit and accessory weights are shown in
Tables 1 and 2. Unit may be mounted on class A, B, or C roof-
ing material.
ROOF CURB — Assemble and install roof curb as described
in instructions shipped with the accessory. Accessory roof curb
and information required to field fabricate a roof curb is shown
in Fig. 3 and 4. Install insulation, cant strips, roofing, and
counter flashing as required. For unit condensate drain to func-
tion properly, curb must be level or within tolerances shown in
Fig. 3.
NOTE: Units with double-wall floor design (“Double Wall on-
the-bottom”) are not compatible with roof curbs.
STEEL BEAMS — If roof curb is not used, support unit with
steel beams along its entire length and then support steel as re-
quired. Cross members are required to support across its width
at each lifting lug location; use more cross members for sup-
port as needed.
Step 4 — Slab Mount Unit — Provide a level con-
crete slab that extends beyond unit cabinet at least 6 inches.
Use gravel apron in front of condenser coil air inlet to prevent
grass and foliage from obstructing airflow. Provide a slab mini-
mum 8 in. thick with sufficient height above grade to allow for
condensate trap as described in Step 8.
Flexible
Connectors
Supply and
Return
Vibration
Isolators
in Roof
Curb
Intake
Plenum
Supply
Fan
Discharge
Plenum Compressor/
Condensing
Section All Roof
Penetrations
Should Be
Sealed
Air Tight
Round Duct Controls
Rumble Best
Supply and Return
Ducts Lined with
Acoustical Duct Liner
Fig. 1 — Acoustical Considerations
CAUTION
Do not lift unit with forklift truck. Move unit with over-
head rigging only.

4
A
B
C
D
E
F
a48-8682
MINIMUM SPACING (ft)
UNIT A B C D E F
48
Series 12 8 12 10 10 10
50
Series 10 8 8 10 10 10
Fig. 2 — Multiple Unit Minimum Separation

5
Table 1 — Physical Data 48N Sizes N-T (75-150 Tons Nominal Capacity)
LEGEND * Base unit includes: economizer dampers and hoods, filter tracks less filters, evaporator coil
mounting less the evaporator, extended plenum, and standard efficiency condenser. For 75-
105 nominal ton units only, base unit weight also includes the short supply fan section.
BASE UNIT N P Q R S T
NOMINAL CAPACITY (tons) 75 90 105 120 130 150
WEIGHT (lb)
Base Unit* 12,000 12,455 12,455 16,170 16,860 17,040
Split Unit - Main Section 9,110 9,565 9,565 12,880 13,570 13,750
Split Unit - Return Section 2,890 2,890 2,890 3,290 3,290 3,290
COMPRESSORS Scroll
Quantity 566 8 8 8
Oil Charge (oz) per Compressor 110 110 110 110 110 110
Compressor A1 ZP182 ZP154 ZP182 ZP182 ZP154 ZP182
Compressor A2 ZP182 ZP154 ZP182 ZP154 ZP182 ZP182
Compressor A3 0 ZP154 ZP182 ZP154 ZP182 ZP182
Compressor A4 0 0 0 ZP154 ZP182 ZP182
Compressor B1 ZP137 ZP182 ZP182 ZP182 ZP154 ZP182
Compressor B2 ZP137 ZP182 ZP182 ZP154 ZP182 ZP182
Compressor B3 ZP137 ZP182 ZP182 ZP154 ZP182 ZP182
Compressor B4 0 0 0 ZP154 ZP182 ZP182
Stages of Capacity, % Total Capacity 0,18,23,41,65,
82,100 0,11,15,33,49, 67,82,100 0,13,17,33,50, 67,83,100 0,11,14,28,40, 52,64,76,88,100 0,8,11,22,35, 48,61,74,87,100 0,9,13,25,38, 50,63,75,88,90
Number of Refrigerant Circuits 222 2 2 2
REFRIGERANT
Type R-410A
Charge Amount See Table 6
METERING DEVICE
Type... Quantity per Circuit Electronically controlled expansion devices... two (2) per circuit
STANDARD EFFICIENCY UNIT CONDENSER MCHX
Material Aluminum Aluminum Aluminum Aluminum Aluminum Aluminum
Number of Total Coils 444 4 6 6
Total Face Area (sq ft) 138.7 173.3 173.3 173.3 173.3 260.0
HIGH EFFICIENCY UNIT CONDENSER MCHX
NA
Material Aluminum Aluminum Aluminum Aluminum Aluminum
Number of Total Coils 466 6 6
Total Face Area (sq ft) 138.7 173.3 260.0 260.0 260.0
EVAP-STANDARD CAPACITY with STD EFFICIENCY RTPF
Material CU-AL CU-AL CU-AL CU-AL CU-AL CU-AL
Quantity 222 2 2 2
Tube Type Cross Hatched Cross Hatched Cross Hatched Cross Hatched Cross Hatched Cross Hatched
Rows (each) 446 4 6 6
FPI 16 16 16 16 16 16
Total Face Area (sq ft) 78.8 78.8 78.8 99.6 99.6 99.6
EVAP-STANDARD CAPACITY with HIGH
EFFICIENCY RTPF
NA
Material CU-AL CU-AL CU-AL CU-AL CU-AL
Quantity 222 2 2
Tube Type Cross Hatched Cross Hatched Cross Hatched Cross Hatched Cross Hatched
Rows (each) 446 4 6
FPI 16 16 16 16 16
Total Face Area (sq ft) 78.8 78.8 78.8 99.6 99.6
EVAP-HIGH CAPACITY with STD EFFICIENCY RTPF
Material CU-AL CU-AL CU-AL CU-AL CU-AL CU-AL
Quantity 222 2 2 2
Tube Type Cross Hatched Cross Hatched Cross Hatched Cross Hatched Cross Hatched Cross Hatched
Rows (each) 668 6 8 8
FPI 16 16 16 16 16 16
Total Face Area (sq ft) 78.8 78.8 78.8 99.6 99.6 99.6
EVAP-HIGH CAPACITY with HIGH EFFICIENCY RTPF
NA
Material CU-AL CU-AL CU-AL CU-AL CU-AL
Quantity 222 2 2
Tube Type Cross Hatched Cross Hatched Cross Hatched Cross Hatched Cross Hatched
Rows (each) 668 6 8
FPI 16 16 16 16 16
Total Face Area (sq ft) 78.8 78.8 78.8 99.6 99.6
CONDENSER FAN, STANDARD EFFICIENCY
Number of Fans 466 6 9 9
Type Prop/Metal Prop/Metal Prop/Plastic Prop/Plastic Prop/Metal Prop/Plastic
Diameter (in.) 30.5 30 30.5 30.5 30 30.5
Motor Hp 111 1 1 1
Nominal Cfm 41,000 81,000 81,000 81,000 93,000 122,400
Motor Rpm 1140 1140 1140 1140 1140 1140
CONDENSER FAN, HIGH EFFICIENCY
Number of Fans 699 9 9
NA
Type Prop/Metal Prop/Plastic Prop/Plastic Prop/Plastic Prop/Plastic
Diameter (in.) 30.5 30.5 30.5 30.5 30.5
Motor Hp 111 1 1
Nominal Cfm 61,000 93,000 93,000 93,000 93,000
Motor Rpm 1140 1140 1140 1140 1140
Cu-Al — Copper-to-Aluminum
DWDI — Double Width Double Inlet
FPI — Fins per Inch
MBtuh — Btuh in Thousands
MCHX — Microchannel Heat Exchanger
RTPF — Round Tube Plate Fin
SWSI — Single Width Single Inlet

6
Table 1 — Physical Data 48N Sizes N-T (75-150 Tons Nominal Capacity) (cont)
LEGEND * Base unit includes: economizer dampers and hoods, filter tracks less filters, evaporator coil
mounting less the evaporator, extended plenum, and standard efficiency condenser. For 75-
105 nominal ton units only, base unit weight also includes the short supply fan section.
BASE UNIT N P Q R S T
NOMINAL CAPACITY (tons) 75 90 105 120 130 150
HUMIDI-MIZER®COIL
Type MCHX
Material Aluminum
Quantity 1
Surface E-Coated
Total Face Area (sq ft) 34.5 43 43 43 43 43
STANDARD AND HIGH CAPACITY HOT WATER COILS
Type RTPF
Material Aluminum Fin, Copper Tube
Quantity 2
Tube Type Smooth
Rows (each) 2
FPI 12
Total Face Area (sq ft) 22.4 26.4
STANDARD AND HIGH CAPACITY STEAM COIL
Type RTPF
Material Aluminum Fin, Copper Tube, Steel Header, Sloped Casing
Quantity 2
Tube Type Smooth
Connection Size, Length (in.) 2.50, 3.00
Total Face Area (sq ft) 40.1 49.0
HEATING SECTION LOW (48N ONLY)
Heating Section 2223 3 3
Number of Heat Exchangers 18 18 18 27 27 27
Output (MBtuh) 648 648 648 972 972 972
Temperature Rise Range (F) 10-40 10-40 10-40 15-45 15-45 15-45
Efficiency (%) 81 81 81 81 81 81
Burner Orifice Quantity, Diameter (in.), Drill No. 18, 0.1285, 30 18, 0.1285, 30 18, 0.1285, 30 27, 0.1285, 30 27, 0.1285, 30 27, 0.1285, 30
Manifold Pressure (in. wg) 3.1 3.1 3.1 3.1 3.1 3.1
Line Pressure (in. wg) (min...max) 5.8-11 5.8-11 5.8-11 6.2-11 6.2-11 6.2-11
Firing Stages (Standard) 2222 2 2
Firing Stages (Modulating) 14-100% 14-100% 14-100% 9-100% 9-100% 9-100%
Number of Gas Valves 2223 3 3
HEATING SECTION MED (48N ONLY)
Heating Section
NA
334 4 4
Number of Heat Exchangers 27 27 36 36 36
Input/Output (MBtuh) 972 972 1296 1296 1296
Temperature Rise Range (F) 20-50 20-50 20-50 20-50 20-50
Efficiency (%) 81 81 81 81 81
Burner Orifice Quantity, Diameter (in.), Drill No. 27, 0.1285, 30 27, 0.1285, 30 36, 0.1285, 30 36, 0.1285, 30 36, 0.1285, 30
Manifold Pressure (in. wg) 3.1 3.1 3.1 3.1 3.1
Line Pressure (in. wg) (min...max) 6.3-11 6.3-11 6.2-11 6.2-11 6.2-11
Firing Stages (Standard) 222 2 2
Firing Stages (Modulating) 9-100% 9-100% 7-100% 7-100% 7-100%
Number of Gas Valves 334 4 4
HEATING SECTION HIGH (48N ONLY)
Heating Section 3445 5 5
Number of Heat Exchangers 27 36 36 45 45 45
Input/Output (MBtuh) 972 1296 1296 1620 1620 1620
Temperature Rise Range (F) 20-50 25-65 25-65 25-55 25-55 25-55
Efficiency (%) 81 81 81 81 81 81
Burner Orifice Quantity, Diameter (in.), Drill No. 27, 0.1285, 30 36, 0.1285, 30 36, 0.1285, 30 45, 0.1285, 30 45, 0.1285, 30 45, 0.1285, 30
Manifold Pressure (in. wg) 3.1 3.1 3.1 3.1 3.1 3.1
Line Pressure (in. wg) (min...max) 6.3-11 6.3-11 6.3-11 6.2-11 6.2-11 6.2-11
Firing Stages (Standard) 2222 2 2
Firing Stages (Modulating) 9-100% 7-100% 7-100% 5-100% 5-100% 5-100%
Number of Gas Valves 3445 5 5
SUPPLY FAN
Standard Supply Fan
Diameter (in.) 28 32
Wheel and Blade Type DWDI Airfoil DWDI Airfoil
Maximum Allowable Cfm 42,000 60,000
Maximum Allowable Speed (rpm) 1,800 1,550
Shaft Diameter at Pulley (in.) 2.25 2.5
High Static Supply Fan
Diameter (in.) 40 40
Wheel and Blade Type DWDI Airfoil DWDI Airfoil
Maximum Allowable Cfm 52,500 60,000
Maximum Allowable Speed (rpm) 1,250 1,250
Shaft Diameter at Pulley (in.) 33
Cu-Al — Copper-to-Aluminum
DWDI — Double Width Double Inlet
FPI — Fins per Inch
MBtuh — Btuh in Thousands
MCHX — Microchannel Heat Exchanger
RTPF — Round Tube Plate Fin
SWSI — Single Width Single Inlet

7
Table 1 — Physical Data 48N Sizes N-T (75-150 Tons Nominal Capacity) (cont)
LEGEND * Base unit includes: economizer dampers and hoods, filter tracks less filters, evaporator coil
mounting less the evaporator, extended plenum, and standard efficiency condenser. For 75-
105 nominal ton units only, base unit weight also includes the short supply fan section.
BASE UNIT N P Q R S T
NOMINAL CAPACITY (tons) 75 90 105 120 130 150
OPTIONAL POWER EXHAUST
Power Exhaust
Diameter (in.) 20 23
Wheel and Blade Type DWDI Forward Curve
Maximum Allowable Cfm 42,000 60,000
Maximum Allowable Speed (rpm) 1,200 1,200
Shaft Diameter at Pulley (in.) 1.75 1.75
High Static Power Exhaust
Diameter (in.) 36 40
Wheel and Blade Type DWDI Forward Curve DWDI Forward Curve
Maximum Allowable Cfm 42,000 60,000
Maximum Allowable Speed (rpm) 650 600
Shaft Diameter at Pulley (in.) 2.5 3
OPTIONAL RETURN FAN
Return Fan
Diameter (in.) 40 40
Wheel and Blade Type SWSI Plenum Airfoil SWSI Plenum Airfoil
Maximum Allowable Cfm 52,500 60,000
Maximum Allowable Speed (rpm) 1236 1236
Shaft Diameter at Pulley (in.) 2.5 2.5
High Static Return Fan
Diameter (in.) 45 50 56
Wheel and Blade Type SWSI Plenum Airfoil
Maximum Allowable Cfm 60,000 60,000 60,000
Maximum Allowable Speed (rpm) 850 780 720
Shaft Diameter at Pulley (in.) 3
MIXED AIR FILTERS
MERV 7 Pleated Filters 2 inch, MERV 7 2 inch, MERV 7
Quantity 28 28
Size (in.) 20x24x2 20x25x2
MERV 8 Pleated Filters 4 inch, MERV 8 4 inch, MERV 8
Quantity 28 28
Size (in.) 20x24x4 20x25x4
MERV 14 Pleated Filters 4 inch, MERV 14 4 inch, MERV 14
Quantity 28 28
Size (in.) 20x24x4 20x25x4
MERV 14 Cartridge Filters, 2 or 4-in. in Pre-Filters 12 inch, MERV 14 Cartridge Filters 12 inch, MERV 14 Cartridge Filters
Quantity 20 20
Size (in.) (15) 20x24x12, (5) 24x24x12 24x24x12
MERV 14 Bag, 2 or 4-in. in Pre-Filters 12 inch, MERV 14 Bag Filters 12 inch, MERV 14 Bag Filters
Quantity 20 20
Size (in.) (15) 20x24x12, (5) 24x24x12 24x24x12
MERV 15 Bag, 2 or 4-in. in Pre-Filters 19 inch, MERV 15 Bag Filters 19 inch, MERV 15 Bag Filters
Quantity 20 20
Size (in.) (15) 20x24x19, (5) 24x24x19 24x24x19
FINAL FILTERS
MERV 14 Cartridge Filters, 2 or 4-in. in Pre-Filters 12 inch, MERV 14 Cartridge Filters 12 inch, MERV 14 Cartridge Filters
Quantity 19 19
Size (in.) (14) 20x24x12, (5) 24x24x12 24x24x12
MERV 15 Bag, 2 or 4-in. in Pre-Filters 19 inch, MERV 15 Bag Filters 19 inch, MERV 15 Bag Filters
Quantity 19 19
Size (in.) (14) 20x24x19, (5) 24x24x19 24x24x19
MERV 17 HEPA, 2 or 4-in. in Pre-Filters 12 inch, MERV 17 HEPA Filters, 99.99% 12 inch, MERV 17 HEPA Filters, 99.99%
Quantity 19 19
Size (in.) (14) 24x12x12, (5) 24x24x12 24x24x12
OUTSIDE AIR SCREENS
Standard Hood (Motorized OA and Economizer
Options) Aluminum Frame, Permanent
Quantity 12 Screens 16 Screens
Size (in.) 16 7/8 x 31 16 7/8 x 31
Cu-Al — Copper-to-Aluminum
DWDI — Double Width Double Inlet
FPI — Fins per Inch
MBtuh — Btuh in Thousands
MCHX — Microchannel Heat Exchanger
RTPF — Round Tube Plate Fin
SWSI — Single Width Single Inlet

8
Table 2 — Operating Weights of Options and Accessories (lb)
LEGEND
NOTE: Please refer to E-CAT for selection.
OPTION OR ACCESSORY 48N UNIT SIZE (TON NOMINAL CAPACITY)
N
(75) P (90) Q (105) R (120) S (130) T (150)
Economizer 140 140 140 140 140 140
Filters
2 in. MERV 7 90 90 90 100 100 100
4 in. MERV 8 150 150 150 175 175 175
4 in. MERV 14 175 175 175 210 210 210
12 in. MERV 14 Bag with 2 in. Pre-Filter 200 200 200 225 225 225
12 in. MERV 14 Bag with 4 in. Pre-Filter 260 260 260 300 300 300
19 in. MERV 15 Bag with 2 in. Pre-Filter 300 300 300 335 335 335
19 in. MERV 15 Bag with 4 in. Pre-Filter 320 320 320 350 350 350
12 in. MERV 14 Cartridge with 2 in. Pre-Filter 350 350 350 375 375 375
12 in. MERV 14 Cartridge with 4 in. Pre-Filter 370 370 370 400 400 400
Field Use Filter Section 635 635 635 665 665 665
Evaporator
Standard Capacity 625 625 832 795 1053 1053
High Capacity 832 832 1110 1053 1402 1402
High-Efficiency Condenser 310 691 691 691 None NA
Extended Chassis 320 320 320 335 335 335
Humidi-MiZer®Dehumidification System 475 495 495 510 510 510
Gas Heat
Low 937 937 937 1099 1099 1099
Medium NA 1067 1067 1229 1229 1229
High 1067 1197 1197 1469 1469 1469
Modulating 50 50 50 50 50 50
Blank Section
4 ft 530 530 530 555 555 555
8 ft 1060 1060 1060 1110 1110 1110
Post Filters
19 in. MERV 15 Bag with 2 in. Pre-Filter 830 830 830 890 890 890
19 in. MERV 15 Bag with 4 in. Pre-Filter 850 850 850 905 905 905
12 in. MERV 14 Cart with 2 in. Pre-Filter 880 880 880 930 930 930
12 in. MERV 14 Cart with 4 in. Pre-Filter 900 900 900 955 955 955
12 in. MERV 17 HEPA with 2 in. Pre-Filter 905 905 905 965 965 965
12 in. MERV 17 HEPA with 4 in. Pre-Filter 930 930 930 980 980 980
Supply Fan
High-Static Supply Fan 1274 1274 1274 1169 1169 1169
Standard Supply Fan 965 965 965 1071 1071 1071
PE (Power Exhaust) Fan
High-Static PE Fan 927 927 927 927 927 927
Standard PE Fan 619 727 727 727 727 727
Return Fan
High-Static Return Fan 974 1086 1298 1298 1298 1298
Standard Return Fan 895 895 895 895 895 895
Supply/PE/Return Motor Includes VFD
460 Volt ODP
7.5 Hp 183 183 183 183 183 183
10 Hp 209 209 209 209 209 209
15 Hp 320 320 320 320 320 320
20 Hp 374 374 374 374 374 374
25 Hp 417 417 417 417 417 417
30 Hp 456 456 456 456 456 456
40 Hp 697 697 697 697 697 697
50 Hp 784 784 784 784 784 784
60 Hp 897 897 897 897 897 897
75 Hp 1275 1275 1275 1275 1275 1275
100 Hp 1488 1488 1488 1488 1488 1488
ODP — Open Drip Proof
TEFC — Totally Enclosed, Fan Cooled
VFD — Variable Frequency Drive

9
Table 2 — Operating Weights of Options and Accessories (lb) (cont)
LEGEND
NOTE: Please refer to E-CAT for selection.
OPTION OR ACCESSORY 48N UNIT SIZE (TON NOMINAL CAPACITY)
N
(75) P (90) Q (105) R (120) S (130) T (150)
Supply/PE/Return Motor Includes VFD
460 Volt TEFC
7.5 Hp 267 267 267 267 267 267
10 Hp 283 283 283 283 283 283
15 Hp 368 368 368 368 368 368
20 Hp 437 437 437 437 437 437
25 Hp 576 576 576 576 576 576
30 Hp 604 604 604 604 604 604
40 Hp 991 991 991 991 991 991
50 Hp 925 925 925 925 925 925
60 Hp 1163 1163 1163 1163 1163 1163
75 Hp 1275 1275 1275 1275 1275 1275
100 Hp 1488 1488 1488 1488 1488 1488
Supply/PE/Return Motor Includes VFD
575 Volt ODP
7.5 Hp 186 186 186 186 186 186
10 Hp 204 204 204 204 204 204
15 Hp 327 327 327 327 327 327
20 Hp 369 369 369 369 369 369
25 Hp 433 433 433 433 433 433
30 Hp 456 456 456 456 456 456
40 Hp 697 697 697 697 697 697
50 Hp 784 784 784 784 784 784
60 Hp 897 897 897 897 897 897
75 Hp 1194 1194 1194 1194 1194 1194
100 Hp 1488 1488 1488 1488 1488 1488
Supply/PE/Return Motor Includes VFD
575 Volt TEFC
7.5 Hp 228 228 228 228 228 228
10 Hp 277 277 277 277 277 277
15 Hp 382 382 382 382 382 382
20 Hp 436 436 436 436 436 436
25 Hp 616 616 616 616 616 616
30 Hp 652 652 652 652 652 652
40 Hp 795 795 795 795 795 795
50 Hp 897 897 897 897 897 897
60 Hp 933 933 933 933 933 933
75 Hp 1194 1194 1194 1194 1194 1194
100 Hp 1488 1488 1488 1488 1488 1488
Supply/PE/Return Motor Includes VFD Bypass
7.5 Hp 10 10 10 10 10 10
10 Hp 10 10 10 10 10 10
15 Hp 10 10 10 10 10 10
20 Hp 20 20 20 20 20 20
25 Hp 20 20 20 20 20 20
30 Hp 40 40 40 40 40 40
40 Hp 40 40 40 40 40 40
50 Hp 40 40 40 40 40 40
60 Hp 40 40 40 40 40 40
75 Hp 60 60 60 60 60 60
100 Hp 75 75 75 75 75 75
Condenser Grilles
Standard Efficiency 100 100 100 100 125 125
High Efficiency 100 125 125 125 125 NA
Condenser Louvers
Standard Efficiency 225 225 225 225 290 290
High Efficiency 225 290 290 290 290 NA
Service Valves and Replacable Core Filter Drier 40 45 45 50 50 50
Low Ambient 50 50 50 50 50 50
UV Lights 100 100 100 130 130 130
Marine Lights 75 75 75 75 75 75
Split - 2 Piece Unit 268 268 268 280 280 280
ODP — Open Drip Proof
TEFC — Totally Enclosed, Fan Cooled
VFD — Variable Frequency Drive

10
Table 3 — Supply Fan and Drive Data
Table 4 — Power Exhaust Fan and Drive Data
FAN MOTOR HP MOTOR RPM
MOTOR
SHAFT
SIZE (in.) FAN RPM
FAN
SHAFT
SIZE (in.)
DRIVE
SHEAVE
BROWNING BUSHING TYPE
DRIVEN
SHEAVE
BROWNING BUSHING TYPE BELTS QTY OF BELTS
FAN
SPEED
(rpm)
Standard Fan
75-105 Tons
Nominal
Capacity
50 1770 2.125 1800
2.25
4B5V70 B 2 1/8 4B5V68 B 2 1/4 5VX530 4 1821/1821
40 1770 2.125 1600 3B5V68 B 2 1/8 3B5V74 B 2 1/4 5VX540 3 1628/1628
30 1765 1.875 1450 3B5V70 B 1 7/8 3B5V86 B 2 1/4 BX55 3 1448/1448
25 1765 1.875 1400 3B5V64 B 1 7/8 3B5V80 B 2 1/4 BX53 3 1425/1425
20 1765 1.625 1250 3B5V56 B 1 5/8 3B5V80 B 2 1/4 BX53 3 1255/1255
Standard Fan
120-150 Tons
Nominal
Capacity
60 1775 2.375 1550
2.5
4B5V70 B 2 3/8 4R5V80 R1 2 1/2 5VX600 4 1595/1595
50 1770 2.125 1400 4B5V70 B 2 1/8 4R5V90 R1 2 1/2 5VX630 4 1412/1412
40 1770 2.125 1300 3B5V68 B 2 1/8 3R5V92 R1 2 1/2 5VX630 3 1328/1328
30 1765 1.875 1200 3B5V70 B 1 7/8 3R5V103 R1 2 1/2 5VX670 3 1229/1229
25 1765 1.875 1100 3B5V64 B 1 7/8 3R5V103 R1 2 1/2 5VX660 3 1125/1125
High Static
75-150 Tons
Nominal
Capacity
100 1775 2.875 1250
3
5R5V90 R1 2 7/8 5B5V124 R1 3 5VX830 5 1264/1264
75 1775 2.375 1100 4B5V80 B 2 3/8 4R5V132 R1 3 5VX840 4 1098/1098
60 1775 2.375 1050 4B5V70 B 2 3/8 4R5V118 R1 3 5VX800 4 1077/1077
50 1770 2.125 1000 4B5V70 B 2 1/8 4R5V125 R1 3 5VX830 4 1013/1013
40 1770 2.125 900 3B5V68 B 2 1/8 3R5V140 R1 3 5VX850 3 918/918
30 1765 1.875 800 3B5V70 B 1 7/8 3B154R R1 3 BX88 3 821/821
25 1765 1.875 750 3B5V64 B 1 7/8 3B154R R1 3 BX87 3 753/753
FAN MOTOR HP MOTOR RPM
MOTOR
SHAFT
SIZE (in.) FAN RPM
FAN
SHAFT
SIZE (in.)
DRIVE
SHEAVE
BROWNING BUSHING TYPE
DRIVEN
SHEAVE
BROWNING BUSHING TYPE BELTS QTY OF BELTS
FAN
SPEED
(rpm)
Standard
Fan 75 Tons
Nominal
Capacity
30 1765 1.875 1200
1.75
3B5V70 B 1 7/8 3R5V103 R1 1 3/4 5VX570 3 1229/1229
25 1765 1.875 1150 3B5V64 B 1 7/8 3R5V103 R1 1 3/4 5VX560 3 1125/1125
20 1765 1.625 1125 3B5V56 B 1 5/8 3B5V90 B 1 3/4 BX52 3 1120/1120
15 1770 1.625 1100 2B5V64 B 1 5/8 2Q5V103 Q1 1 3/4 5VX580 2 1128/1128
10 1755 1.375 1100 2BK52H H 1 3/8 2B5V74 B 1 3/4 BX51 2 1117/1117
7.5 1760 1.375 1100 2BK52H H 1 3/8 2B5V74 B 1 3/4 BX51 2 1120/1120
Standard
Fan 90-150
Tons
Nominal
Capacity
50 1770 2.125 1200
1.75
4B5V70 B 2 1/8 4R5V103 R1 1 3/4 5VX540 4 1225/1225
40 1770 2.125 1175 3B5V68 B 2 1/8 3R5V103 R1 1 3/4 5VX540 3 1197/1197
30 1765 1.875 1150 3B5V70 B 1 7/8 3B5V110 B 1 3/4 5VX580 3 1129/1129
25 1765 1.875 1125 3B5V64 B 1 7/8 3R5V103 R1 1 3/4 5VX550 3 1125/1125
20 1765 1.625 1100 3B5V56 B 1 5/8 3B5V90 B 1 3/4 BX52 3 1120/1120
15 1770 1.625 1050 2B5V64 B 1 5/8 2B5V110 B 1 3/4 5VX590 2 1036/1036
10 1755 1.375 1000 2BK52H H 1 3/8 2B5V80 B 1 3/4 BX51 2 1036/1036
7.5 1760 1.375 950 2BK52H H 1 3/8 2B5V90 B 1 3/4 BX53 2 927/927
High Static
75-090 Tons
Nominal
Capacity
40 1770 2.125 650
2.5
3B5V68 B 2 1/8 35V1870E E 2 1/2 5VX830 3 657/657
30 1765 1.875 625 3B5V70 B 1 7/8 3TB200 Q1 2 1/2 BX86 3 635/635
25 1765 1.875 600 3B5V64 B 1 7/8 3TB200 Q1 2 1/2 BX85 3 583/583
20 1765 1.625 550 3B5V56 B 1 5/8 3TB184 Q1 2 1/2 BX82 3 557/557
15 1770 1.625 500 2B5V64 B 1 5/8 25V2360E E 2 1/2 5VX950 2 490/490
10 1755 1.375 450 2BK52H H 1 3/8 2TB184 Q1 2 1/2 BX82 2 460/460
7.5 1760 1.375 425 2BK52H H 1 3/8 2TB184 Q1 2 1/2 AX81 2 425/425
High Static
105-150Tons
Nominal
Capacity
60 1775 2.375 600
3
4B5V70 B 2 3/8 4R5V212 R1 3 5VX930 4 597/597
50 1770 2.125 575 4B5V70 B 2 1/8 4R5V212 R1 3 5VX950 4 596/596
40 1770 2.125 550 3B5V68 B 2 1/8 3R5V212 R1 3 5VX930 3 579/579
30 1765 1.875 525 3B5V70 B 1 7/8 3B250R R1 3 BX103 3 509/509
25 1765 1.875 500 3B5V64 B 1 7/8 35V2360E E 3 5VX1000 3 488/488
20 1765 1.625 450 3B5V56 B 1 5/8 35V2360E E 3 5VX1000 3 428/428
15 1770 1.625 400 2B5V64 B 1 5/8 2B300R R1 3 BX112 2 391/391

11
Table 5 — Return Fan Drive Data
Table 6 — Refrigerant Charge
FAN MOTOR HP MOTOR RPM
MOTOR
SHAFT
SIZE (in.) FAN RPM
FAN
SHAFT
SIZE (in.)
DRIVE
SHEAVE
BROWNING BUSHING TYPE
DRIVEN
SHEAVE
BROWNING BUSHING TYPE BELTS QTY OF BELTS FAN SPEED (rpm)
Standard
Return Fan
All Sizes
50 1770 2.125 1236
2.5
4B5V70 B 2 1/8 4R5V103 R1 2 1/2 5VX1000 4 1232/1232
40 1770 2.125 1149 3B5V68 B 2 1/8 3R5V109 R1 2 1/2 5VX1000 3 1131/1131
30 1765 1.875 1025 3B5V70 B 1 7/8 3TB124 Q1 2 1/2 BX98 3 1015/1015
25 1765 1.875 940 3B5V64 B 1 7/8 3TB124 Q1 2 1/2 BX98 3 931/931
20 1765 1.625 930 3B5V56 B 1 5/8 3TB110 Q1 2 1/2 BX93 3 922/922
15 1770 1.625 890 2B5V64 B 1 5/8 2Q5V132 Q1 2 1/2 5VX1000 2 878/878
10 1755 1.375 770 2BK52H H 1 3/8 2TB110 Q1 2 1/2 BX90 2 761/761
7.5 1760 1.375 720 2BK52H H 1 3/8 2TB110 Q1 2 1/2 AX89 2 717/717
High Static
Return Fan
75 Tons
Nominal
Capacity
30 1765 1.875 850
3
3B5V70 B 1 7/8 3R5V150 R1 3 5VX1120 3 841/841
25 1765 1.875 825 3B5V64 B 1 7/8 3R5V140 R1 3 5VX1120 3 825/825
15 1770 1.625 680 2B5V64 B 1 5/8 2B160R R1 3 BX112 2 728/728
10 1755 1.375 600 2BK52H H 1 3/8 2B154R R1 3 BX105 2 548/548
7.5 1760 1.375 550 2BK52H H 1 3/8 2B154R R1 3 BX105 2 549/549
High Static
Return Fan
90 Tons
Nominal
Capacity
40 1770 2.125 780
3
3B5V68 B 2 1/8 3R5V160 R1 3 5VX1230 3 768/768
30 1765 1.875 750 3B5V70 B 1 7/8 3B160R R1 3 BX120 3 790/790
25 1765 1.875 720 3B5V64 B 1 7/8 3B160R R1 3 BX120 3 725/725
20 1765 1.625 650 3B5V56 B 1 5/8 3B154R R1 3 BX113 3 663/663
15 1770 1.625 600 2B5V64 B 1 5/8 2B200R R1 3 BX123 2 584/584
10 1755 1.375 520 2BK52H H 1 3/8 2B160R R1 3 BX112 2 528/528
7.5 1760 1.375 480 2BK52H H 1 3/8 2B184R R1 3 BX116 2 461/461
High Static
Return Fan
105-150
Tons
Nominal
Capacity
60 1775 2.375 720
3
4B5V70 B 2 3/8 4B174R R1 3 BX133 4 693/693
50 1770 2.125 680 4B5V70 B 2 1/8 45V1870E E 3 5VX1320 4 676/676
40 1770 2.125 650 3B5V68 B 2 1/8 35V1870E E 3 5VX1320 3 657/657
30 1765 1.875 580 3B5V70 B 1 7/8 3R5V212 R1 3 5VX1400 3 594/594
25 1765 1.875 550 3B5V64 B 1 7/8 3B200R R1 3 AX128 3 555/555
20 1765 1.625 500 3B5V56 B 1 5/8 3B200R R1 3 BX128 3 513/513
15 1770 1.625 450 2B5V64 B 1 5/8 2B250R R1 3 AX136 2 444/444
10 1755 1.375 400 2BK52H H 1 3/8 2B200R R1 3 AX128 2 392/392
UNIT SIZE
(NOMINAL CAPACITY, TONS) UNIT CONFIGURATION
CHARGE (LB) CHARGE (LB)
UNITS WITHOUT HUMIDI-MIZER®
SYSTEM
UNITS WITH HUMIDI-MIZER®
SYSTEM
Circuit A Circuit B Circuit A Circuit B
N
(75)
Standard Capacity Standard Efficiency 46.5 52.6 46.5 69.6
High Capacity Standard Efficiency 62.9 69.0 62.9 86.0
Standard Capacity High Efficiency 50.2 56.5 50.2 73.5
High Capacity High Efficiency 67.0 73.5 67.0 90.5
P
(90)
Standard Capacity Standard Efficiency 55.4 52.0 55.4 71.5
High Capacity Standard Efficiency 67.8 68.5 67.8 88.3
Standard Capacity High Efficiency 59.0 57.2 59.0 76.7
High Capacity High Efficiency 73.8 73.8 73.8 94.0
Q
(105)
Standard Capacity Standard Efficiency 71.5 67.9 71.5 87.4
High Capacity Standard Efficiency 89.5 81.9 89.5 101.4
Standard Capacity High Efficiency 77.5 72.9 77.5 92.4
High Capacity High Efficiency 91.6 88.2 91.6 107.7
R
(120)
Standard Capacity Standard Efficiency 59.9 57.1 59.9 76.6
High Capacity Standard Efficiency 80.3 77.1 80.3 96.6
Standard Capacity High Efficiency 66.5 63.3 66.5 82.8
High Capacity High Efficiency 87.1 83.3 87.1 102.8
S
(130)
Standard Capacity Standard Efficiency 84.9 81.2 84.9 100.7
High Capacity Standard Efficiency 106.0 99.5 106.0 119.0
Standard Capacity High Efficiency 84.5 80.7 84.5 100.2
High Capacity High Efficiency 105.5 99.0 105.5 118.5
T
(150)
Standard Capacity Standard Efficiency 82.5 82.0 82.5 101.5
High Capacity Standard Efficiency 103.5 101.2 103.5 121.7

12
“G”SUPPORT
TO END OF PEDESTAL
SEE CONDENSER
SECTION
DIMENSIONSARE SHOWN IN INCHES. DIMENSIONSIN [ ] ARE IN MILLIMETERS.
SEE CONDENSER
SECTION
Fig. 3 — Roof Curb

13
48N Roof Curb Sizes N, P, Q
(75-105 Ton Nominal Capacity)
* Use Applied Rooftop Builder program to select the proper roof curb.
48N Roof Curb Sizes R, S, T
(120-150 Ton Nominal Capacity)
Fig. 3 — Roof Curb (cont)
PART NUMBER* DIMENSION
A (in.) DIMENSION B (in.) DIMENSION C (in.)
CRRFCURB225A00 361.11 258.61 49.50
CRRFCURB226A00 376.20 273.70 49.50
CRRFCURB227A00 385.11 282.61 49.50
CRRFCURB228A00 400.20 297.70 49.50
CRRFCURB229A00 427.61 325.11 49.50
CRRFCURB230A00 439.86 337.36 49.50
CRRFCURB231A00 442.70 340.20 49.50
CRRFCURB232A00 451.61 349.11 49.50
CRRFCURB233A00 454.95 352.45 49.50
CRRFCURB234A00 463.86 361.36 49.50
CRRFCURB235A00 466.70 364.20 49.50
CRRFCURB236A00 475.86 373.36 49.50
CRRFCURB237A00 478.95 376.45 49.50
CRRFCURB238A00 488.11 385.61 49.50
CRRFCURB239A00 490.95 388.45 49.50
CRRFCURB240A00 499.86 397.36 49.50
CRRFCURB241A00 503.20 400.70 49.50
CRRFCURB242A00 512.11 409.61 49.50
CRRFCURB243A00 514.95 412.45 49.50
CRRFCURB244A00 527.20 424.70 49.50
CRRFCURB245A00 536.36 433.86 49.50
CRRFCURB246A00 551.45 448.95 49.50
CRRFCURB247A00 560.36 457.86 49.50
CRRFCURB248A00 575.45 472.95 49.50
PART NUMBER* DIMENSION
A (in.) DIMENSION B (in.) DIMENSION C (in.)
CRRFCURB261A00 386.04 283.54 49.50
CRRFCURB262A00 398.04 283.54 61.50
CRRFCURB263A00 410.04 307.54 49.50
CRRFCURB264A00 422.04 307.54 61.50
CRRFCURB265A00 440.29 325.79 61.50
CRRFCURB266A00 452.54 350.04 49.50
CRRFCURB267A00 464.54 350.04 61.50
CRRFCURB268A00 464.79 362.29 49.50
CRRFCURB269A00 476.54 374.04 49.50
CRRFCURB270A00 476.79 362.29 61.50
CRRFCURB271A00 488.54 374.04 61.50
CRRFCURB272A00 488.79 386.29 49.50
CRRFCURB273A00 500.79 398.29 49.50
CRRFCURB274A00 500.79 386.29 61.50
CRRFCURB275A00 512.79 398.29 61.50
CRRFCURB276A00 513.04 410.54 49.50
CRRFCURB277A00 524.79 422.29 49.50
CRRFCURB278A00 525.04 410.54 61.50
CRRFCURB279A00 536.79 422.29 61.50
CRRFCURB280A00 537.04 434.54 49.50
CRRFCURB281A00 549.04 434.54 61.50
CRRFCURB282A00 561.29 458.79 49.50
CRRFCURB283A00 573.29 458.79 61.50
CRRFCURB284A00 585.29 482.79 49.50
CRRFCURB285A00 597.29 482.79 61.50

14
DIMENSIONSARE SHOWN IN INCHES. DIMENSIONSIN [ ] ARE IN MILLIMETERS.
Fig. 4 — Roof Curb Condenser Section
Roof Curb Condenser Support
UNIT SIZE
NOMINAL TONS COND COILS 2V COND COIL 3V DIM.
DDIM.
EDIM.
FDIM.
G
75 ALL YES — 129.50 10.98 131.75±0.75 133.50 90 STD EFFICIENCY YES — 129.50 10.98 131.75±0.75 133.50 90 HIGH EFFICIENCY — YES 181.50 10.36 183.75±0.75 183.25 105 STD EFFICIENCY YES — 129.50 10.98 131.75±0.75 133.50 105 HIGH EFFICIENCY — YES 181.50 10.36 183.75±0.75 183.25 120 STD EFFICIENCY YES — 129.50 10.98 131.75±0.75 133.50 120 HIGH EFFICIENCY — YES 181.50 10.36 183.75±0.75 183.25 130 ALL — YES 181.50 10.36 183.75±0.75 183.25 150 ALL — YES 181.50 10.36 183.75±0.75 183.25 ACCESSORY PART NUMBER
CRRFCURB286A00 — 129.50 10.98 — —
— CRRFCURB287A00 181.50 10.36 — —

15
Step 5 — Install Curb Gasketing — After ductwork
has been connected to the roof curb, apply gasket material
(1/2-in. thick x 11/2-in. wide neoprene) where indicated.
Single-Thickness Gasketing (See Fig. 5 for Item Numbers)
— Apply gasketing in the following places:
1. Along both side rails (1) — 2 places, full length
2. Along return air end rail (2) — 1 place
3. Around return air internal duct flange (3) — 1 or 2 places
4. Around supply air internal duct flanges (4) — 3 places
5. Along supply section base rail (5) — 1 place
Condenser Section Roof Curb (See Fig. 6) — Apply single-
thickness gasket along both side rails (5).
Step 6 — Install Field-Fabricated Ductwork
Field-fabricated ductwork for vertical supply/vertical return
units must be attached to the roof curb, or to the support steel,
prior to the final rigging and installation of the unit. Supply and
return duct dimensions are shown in Fig. 3.
To attach ductwork to roof curb, insert duct approximately
10 to 11 in. up into roof curb. Connect ductwork to 14-gage
roof curb material with sheet metal screws driven from inside
the duct.
Secure all ducts to the building structure, using flexible duct
connectors between roof curbs and ducts as required. Ducts
passing through an unconditioned space must be insulated and
covered with a vapor barrier. Outlet grilles must not lie directly
below unit discharge.
Design supply duct strong enough to handle expected
static pressures. Field-fabricated ductwork for horizontal
supply/return units must be attached to the unit.
Step 7 — Rig Unit — Do not drop unit; keep upright.
Use spreader bars over the unit to prevent sling or cable dam-
age. Sheets of plywood placed along the condenser coils will
provide additional protection. All lifting lugs MUST be used
when lifting unit. Level by using unit frame as a reference. See
Fig. 7-9 for information. Unit and accessory weights are shown
in Tables 1 and 2. Weight distribution and center of gravity can
be found in Fig. 10. Additional unit dimensional data can be
found in Fig. 11 and 12.
Step 8 — Connect Condensate Drain — The drain
is a 2-in. FPT pipe connection located on the right-hand side of
the unit looking at the unit from the return air end. See Fig. 11
and 12. Figure 13 shows the additional length of units with an
extended chassis.
With field-supplied fittings and pipe sections, plumb the pri-
mary condensate drain to the 2-in. FPT connector on the base
rail. Use a trap height of at least 7 inches. See Fig. 14 and 15.
Apply a bead of RTV or similar sealant around the pipe joint at
the connector in the base rail.
WARNING
For vertical supply and return units, tools or parts could
drop into ductwork and cause an injury. Install a 90-degree
elbow in the supply and return ductwork between the unit
and the conditioned space. If a 90-degree elbow cannot be
installed, then a grille of sufficient strength and density
should be installed to prevent objects from falling into the
conditioned space. Failure to follow these instructions
could result in personal injury or property damage due to
falling objects.
SUPPLY
RETURN
1
2
3
4
5 ALONG SUPPLY
SECTION END RAIL
Fig. 5 — Gasket Location on Roof Curb
a48-8724
5
5
Fig. 6 — Gasket Location — Condenser Section Roof Curb

16
Fig. 7 — 48N 75-150 Ton Non-Split Rigging
Econ, Bar Rel, Standard
filters, High Cap Evap,
High Efficiency,
High Static Supply Fan
w/ largest motor, High
Static PE w/ largest
motor, No Heat, No Post
section, No Humidimizer,
No Extended Chassis,
No Split, No Field Filter Section
Econ, Bar Rel, Standard
filters, High Cap Evap, High
Efficiency, High Static Supply
Fan w/ largest motor,
High Static Power Exhaust
w/ Largest motor, Low gas heat,
No Post section, No Extended
chassis, No humidimizer,
No Split, No Field filter section

17
Fig. 8 — 48N 75-150 Ton Split (Main Unit) Rigging
Econ, Bar Rel, Cartridge filters, Hi Cap
Evap, High Efficiency, High Static
Supply Fan w/ largest motor, Hi Static
Return Fan w/ largest motor, High
Electric Heat, 8' Blank section w/ post
filters, Extended chassisw/ humidimizer,
Split, No Field filter section
Econ, Bar Rel, Cartridge filters,
Hi Cap Evap, High Efficiency,
High Static Supply Fan w/ largest motor,
Hi Static Return Fan w/ largest motor,
High gas heat, 8' Blank section
w/ post filters, Extended chassis
w/ humidimizer, Split, No Field filter

18
Fig. 9 — 48N 75-150 Ton Split (Return Section) Rigging
High Efficiency, High Static Supply Fan
w/ largest motor, Hi Static Return Fan
w/ largest motor, High Electric Heat, 8' Blank
section w/ post filters, Extended chassis
w/ humidimizer, Split, No Field filter section
Econ, Bar Rel, Cartridge filters, Hi Cap Evap,
High Efficiency, High Static Supply Fan
w/ largest motor,Hi Static Return Fan
w/ largest motor, High gas heat, 8' Blank
section w/ post filters, Extended chassis
w/ humidimizer, Split, No Field filter

19
1A3
00
B
Cond End 0 0
Return End
00
24
NOMINAL
CAPACITY
(tons)
CORNER WEIGHTS (lb) TOTAL (lb) CENTER OF
GRAVITY
1234 A (in.) B (in.)
48 Series Non-Split
75 4,129 4,047 4,892 4,796 17,864 275.9 67.2
90 4,396 4,310 5,359 5,254 19,319 308.1 67.2
105 4,478 4,390 5,526 5,417 19,810 309.8 67.2
120 5,455 5,347 6,474 6,346 23,622 309.7 67.2
130 5,385 5,279 6,719 6,587 23,970 316.7 67.2
150 5,436 5,329 6,816 6,682 24,263 317.5 67.2
48 Series Split
75 4,684 4,592 5,690 5,578 20,544 355.1 67.2
90 4,969 4,871 6,273 6,149 22,261 390.3 67.2
105 5,052 4,952 6,544 6,415 22,964 394.8 67.2
120 6,058 5,939 7,583 7,443 27,013 401.0 67.2
130 5,972 5,854 7,845 7,691 27,361 409.6 67.2
150 6,021 5,903 7,944 7,787 27,654 410.3 67.2
Fig. 10 — Weight Distribution and Center of Gravity
a48-8793

20
Fig. 11 — 48N Unit Sizes N, P, Q (75-105 Ton Nominal Capacity)