Rooftop Unit

Carrier® WeatherMaker® - 20 Ton Packaged Rooftop Gas Heat & Electric Unit R-454B (460-3) service and support

Carrier Commercial Rooftop Unit - 48FE Rooftop Unit Repair, maintenance, and replacement planning

Product service snapshot

Carrier® WeatherMaker® - 20 Ton Packaged Rooftop Gas Heat & Electric Unit R-454B (460-3) service details

Carrier® WeatherMaker® - 20 Ton Packaged Rooftop Gas Heat & Electric Unit R-454B (460-3) is a Carrier® rooftop unit record from the Carrier Enterprise catalog. Catalog model: 48FEDM24A2A6-0A0A0. Product family: 48FE. Green Flow Solution uses this page for commercial model identification, service planning, maintenance conversations, repair diagnostics, and replacement matching.

Brand: Carrier
Model or series: Carrier® WeatherMaker® - 20 Ton Packaged Rooftop Gas Heat & Electric Unit R-454B (460-3)
Equipment type: Rooftop Unit
Product group: Commercial Rooftop Unit - 48FE

Technical snapshot

Carrier® WeatherMaker® - 20 Ton Packaged Rooftop Gas Heat & Electric Unit R-454B (460-3) technical snapshot

Product Specs

Model: 48FEDM24A2A6-0A0A0
Manufacturer Number: 48FEDM24A2A6-0A0A0
Vendor Number: 48FEDM24A2A6-0A0A0
Catalog Brand: Carrier®
Product Family: 48FE
AHRI Usage: Packaged
Air Flow Direction: Horizontal / Vertical
Approvals: AHRI Certified; cULus
BTU Input: 176,000-220,000
BTU Output: 142,000-178,000
Blower Motor HP: 2 2/5
Blower Motor RPM: 250-2,000
Blower Motor Speeds: 2
Blower Motor Type: ECM (Electronically Commutated Motor)
Blower Wheel Diameter: 22"
Brand: Carrier®
CFM: 4,200-7,000
CFM Heating: 3,000-11,000
Color: Gray
Compressor Type: Scroll
Condenser Coil Fins Per Inch (FPI): 18
Condenser Fan Blade Diameter: 22
Condenser Fan Motor Qty: 4
Condenser Motor HP: 1/4
Condenser Motor RPM: 1,100
Condenser Motor Type: PSC (Permanent Split Capacitor)
Cooling Capacity: 248,000
Country Of Origin: MEX
Cycle/Hertz: 60 Hz
Drain Connection Size: 3/4"
Drive Type: Direct
EER: 10
Energy Star Rated: NO
Evaporator Coil Fins Per Inch (FPI): 15
Evaporator Coil Metering Device: TXV/TEV - Thermostatic Expansion Valve
Fuel Type: Natural Gas or LP
Gas Connection Size: 3/4"
Gas Connection Type: NPTF
Heat Exchanger Type: Tubular
Height: 49.375
IEER: 14.5
Ignition Type: Direct Spark (DSI)
Length: 86.375
Locked Rotor Amps (LRA): 140
Maximum Overcurrent Protection (MOCP): 70
Outdoor Air Filter Size (OA) In Inches (W X H X D): (4) 16 x 25 x 1
Phase: Three
Prop 65: YES
Rated Load Amps (RLA): 17.1
Refrigerant: R-454B
Return Air Filter Size (RA) In Inches (W X H X D): (6) 20 x 25 x 2
Sound Level (dBA): 86.5
Stages Cooling: 2
Stages Heating: 2
Thermal Efficiency: 81%
Tier: WeatherMaker®
Tonnage: 20
Voltage: 460 VAC
Weight: 2000
Width: 141.5

Useful troubleshooting details

Confirm the exact model number, serial number, installed equipment type, and site voltage before service or replacement planning.
Match replacement equipment and accessories against current Carrier compatibility requirements, refrigerant type, capacity, airflow, and local code requirements.

Service planning

How GreenFlow handles Carrier® WeatherMaker® - 20 Ton Packaged Rooftop Gas Heat & Electric Unit R-454B (460-3) requests

Identify the equipment

Confirm the model or series name, serial number if available, photos, and whether the unit is roof, exterior, basement, or mechanical-room equipment.

Describe the service issue

Share no heat, no cooling, weak airflow, error codes, alarms, leaks, noise, control problems, or comfort complaints.

Review access and history

Include access notes, tenant or business-hour constraints, filter status, recent repairs, and maintenance records when available.

Plan the next step

GreenFlow can route the request for diagnostics, repair planning, maintenance, replacement scope, or related system upgrades.

Carrier® WeatherMaker® - 20 Ton Packaged Rooftop Gas Heat & Electric Unit R-454B (460-3) service questions

What Carrier Carrier® WeatherMaker® - 20 Ton Packaged Rooftop Gas Heat & Electric Unit R-454B (460-3) alarm or error-code details should I share?

Share the exact alarm, fault, or status message shown on the unit controller, thermostat, service app, or building automation system. Photos of the control screen, unit nameplate, and thermostat/BAS screen help the team understand the issue before dispatch.

What should I check before requesting Carrier® WeatherMaker® - 20 Ton Packaged Rooftop Gas Heat & Electric Unit R-454B (460-3) service?

Confirm the thermostat or building schedule, whether one tenant space or multiple zones are affected, recent filter or maintenance history, and whether the RTU is locked out, noisy, short cycling, or not responding. Do not open rooftop panels or reset electrical equipment if it is unsafe.

Why would a Carrier® WeatherMaker® - 20 Ton Packaged Rooftop Gas Heat & Electric Unit R-454B (460-3) run but not heat or cool correctly?

Possible causes include airflow restrictions, dirty filters, economizer or damper issues, sensor or control faults, compressor or reversing-valve issues, defrost problems, refrigerant concerns, electrical faults, or building automation scheduling. A technician needs the full symptom and alarm context to diagnose it safely.

When is a Carrier® WeatherMaker® - 20 Ton Packaged Rooftop Gas Heat & Electric Unit R-454B (460-3) issue urgent?

Treat the request as urgent when no heat or no cooling affects occupied space, an alarm or lockout is active, there is electrical odor, unusual noise, water intrusion, unsafe rooftop access, or repeated tenant comfort complaints. Include business hours and access notes when scheduling.

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