Carrier WeatherMaster 50GE Electric Cooling Rooftop Unit – Supplied & Professionally Installed by 4Most Energy
The WeatherMaster 50GE is a single-package, all-electric rooftop unit built for small commercial buildings without gas service or pursuing electrification targets, sized 3 to 5 nominal tons. A two-stage scroll compressor circuit on next-generation Puron AdvanceTM (R-454B) refrigerant delivers up to 16.8 SEER2 and 12.0 EER2 (17.2 SEER/12.5 EER under DOE 2018 Appendix M ratings), while the patented EcoBlueTM vane axial indoor fan system — direct-drive, electronically commutated, with 75% fewer moving parts than a belt-drive forward-curved fan — cuts fan energy and eliminates belt, pulley, and bearing maintenance. Where heat is required, factory- or field-installed electric resistance heater modules scale airflow from 900–1,500 CFM on the 3-ton unit up to 1,500–2,500 CFM on the 5-ton unit. R-454B carries a global warming potential of 466 — a 75% reduction versus legacy R-410A — and, as an A2L mildly flammable refrigerant, the unit ships with a factory-installed, UL 60335-2-40–certified leak detection and dissipation system designed to operate for the life of the unit. All 50GE units meet ASHRAE 90.1 and DOE minimum efficiency standards, comply with the US Energy Policy Act (2005), and are AHRI 210/240 certified and UL listed.
Rated performance depends entirely on correct field installation. Electric heat rooftop units place a heavier draw on building electrical capacity than a comparable gas/electric unit, so Ontario installations require ESA-compliant sizing of the service, disconnect, and single-point power connection to the unit's MCA/MOCP rating at 208/230-1/3-60, 460-3-60, or 575-3-60, along with proper thru-the-base electrical routing and heater circuit breaker coordination. Roof curb selection (14 in. or 24 in.), structural load review, field-convertible vertical-to-horizontal airflow configuration, and correct commissioning of the A2L refrigerant leak dissipation system round out the code-driven installation requirements that determine whether the unit's rated SEER2 and heater performance are actually delivered. 4Most Energy is a certified installer for rooftop unit installation Toronto, packaged RTU replacement GTA, and Carrier WeatherMaster 50GE installation Ontario projects, providing licensed gas technician near me-calibre electrical commissioning rigor and ENERGY STAR–calibre rooftop unit Toronto service standards on every job — so the SEER2 and heater performance figures on the nameplate are what the building actually gets.
Replacement Option
The WeatherMaster 50GE is engineered to fit existing 3-to-5-ton roof curbs, and using an appropriately sized curb adapter to bridge differing roof curb and duct footprints it can also replace aging Trane, Lennox, York (Johnson Controls), Daikin, Rheem, and AAON electric cooling packaged rooftop units of comparable tonnage. This lets 4Most Energy replace an aging all-electric rooftop unit from any of these manufacturers without necessarily requiring a full roof curb and structural rework, minimizing both project cost and rooftop downtime.
Warranty
Carrier backs the WeatherMaster® 50GE with a 3-year limited parts warranty from the factory. 4Most Energy handles warranty registration and start-up documentation on your behalf.
Documents
Why Install the Carrier WeatherMaster 50GE with 4Most Energy?
- EcoBlue vane axial indoor fan system direct-drive ECM motor, 75% fewer moving parts, slow ramp-up, and phase loss protection for quieter, more reliable operation than belt-drive forward-curved fans.
- Puron Advance (R-454B) refrigerant 466 GWP, a 75% reduction versus legacy R-410A, easily meeting the EPA's <700 GWP requirement, paired with a factory-installed, UL 60335-2-40–certified leak dissipation control board and sensor designed to last the life of the unit.
- Two-stage electric cooling with scroll compressor TXV metering, fully active evaporator coil, internal line-break overload protection, and no-strip screw collars throughout for faster field service.
- Optional factory- or field-installed electric resistance heat scalable airflow ratings matched to unit size, for buildings without gas service or pursuing all-electric code compliance.
- Optional single-point power kit simplifies electrical connection to one field-supplied power source instead of separate unit and heater circuits.
- Up to 16.8 SEER2 / 12.0 EER2 two-stage cooling capacity control on Standard/Medium or High Static EcoBlue vane axial fan configurations.
- Optional Humidi-MiZer adaptive dehumidification system improved part-load humidity performance on N-series models.
- Optional SystemVu intelligent DDC controller large backlit display, quick-status LEDs, USB data port, and built-in i-Vu®, CCN, and BACnet compatibility for building automation integration, plus EconomizerONE fault detection and diagnostics.
- Re-designed unit control board (UCB) with dial-and-switch indoor fan adjustment, large terminal connections, and clearly labeled plug-in connection points to reduce installation time.
- Tool-less filter access door, handled access panels, and a sloped, corrosion-resistant composite drain pan that sheds water and will not rust.
- Field-convertible horizontal airflow on all 3-to-5-ton models, simplifying replacement on existing curbs.
Specifications
| Model | Nominal Tons | Net Cooling (MBH) | SEER2 | EER2 | SEER (Appendix M) | EER (Appendix M) | Rated CFM Range | Sound (dBA, A-wtd) | Base Unit Weight (lb) |
|---|---|---|---|---|---|---|---|---|---|
| 50GE*04 | 3.0 | 36.0 | 16.8 | 12.0 | 17.2 | 12.5 | 900–1,500 | 75.4 | 490 |
| 50GE*05 | 4.0 | 48.0 | 16.8 | 12.0 | 17.2 | 12.5 | 1,200–2,000 | 79.0 | 510 |
| 50GE*06 | 5.0 | 58.5 | 16.8 | 12.0 | 17.2 | 12.5 | 1,500–2,500 | 79.0 | 555 |
Ratings per AHRI Standard 210/240 at 80°F/67°F wb indoor, 95°F db outdoor. SEER2/EER2 reflect DOE 2023 (M1) test procedure; SEER/EER reflect DOE 2018 Appendix M ratings (208/230-3-60, 460-3-60, and 575-3-60 voltage codes only).
| Electric Heat Airflow Range | 04 | 05 | 06 |
|---|---|---|---|
| Minimum Airflow (CFM) | 900 | 1,200 | 1,500 |
| Maximum Airflow (CFM) | 1,500 | 2,000 | 2,500 |
Installation & Commissioning Process
| Step | Phase | Key Requirements & Scope |
|---|---|---|
| Step 1 | Site Assessment | Existing unit and curb inspection, electrical service capacity check, and roof structural/access evaluation. |
| Step 2 | Load Calculation & Sizing | Confirm correct tonnage, electric heater kW (if required), airflow configuration (vertical or horizontal), and control option (standard thermostat or SystemVu™). |
| Step 3 | Rigging & Crane Setup | WeatherMaster's lightweight base-rail design simplifies crane placement onto the existing or new roof curb for these 3-to-5-ton units. |
| Step 4 | Roof Curb & Structural Prep | Install or verify 14 in./24 in. roof curb, full-perimeter seal, and structural support for the unit's operating weight. |
| Step 5 | Electrical Connection | ESA-compliant hookup to the building's disconnect and single-point power kit, sized to voltage, phase, and MCA/MOCP rating, with thru-the-base electrical connections. |
| Step 6 | Ductwork Tie-in | Supply and return duct connection matched to vertical or horizontal discharge, with sealed transitions. |
| Step 7 | Commissioning | Refrigerant charge verification, A2L leak dissipation system test, heater circuit/thermal limit test, airflow confirmation, control setup, and warranty registration. |
| Step 8 | Final Walkthrough | Filter access, service clearances, and control operation demonstrated before the crew leaves site. |
Carrier's standard coverage on the WeatherMaster 50GE is a 3-year limited parts warranty from the factory. 4Most Energy completes and files the required start-up documentation to keep warranty coverage valid.
Routine maintenance is straightforward by design: the EcoBlueTM direct-drive fan requires no belts, pulleys, or shaft bearings to inspect or replace, and the tool-less filter door simplifies the most frequent service task. Carrier recommends annual inspection of heater element continuity and thermal limit controls where electric heat is installed, condenser coil cleaning, condensate drain pan/trap inspection, and a functional test of the A2L refrigerant leak dissipation system's "Test" button and status LED. 4Most Energy offers scheduled maintenance plans covering filter changes, heater circuit testing, refrigerant circuit and leak-sensor checks, and control board diagnostics via the unit's built-in LED status indicators.
Service Area
Greater Toronto Area (GTA) and surrounding regions
Toronto, Markham, Richmond Hill, Vaughan, Aurora, Newmarket, Scarborough, Brampton, and Mississauga.
Extended Service Area: Stouffville, Oshawa, Barrie, Orangeville, Hamilton, St. Catharines, Guelph, Kitchener.
Frequently Asked Questions
Why choose the all-electric 50GE over the gas heat 48GE?
The 50GE is the right choice where gas service isn't available at the building, where local code or a decarbonization/electrification policy requires all-electric equipment, or where the building's electrical capacity comfortably supports resistance heat. 4Most Energy can help weigh operating cost and electrical service implications against the 48GE during the quote.
What is R-454B, and does the refrigerant change affect installation?
R-454B (Puron AdvanceTM) is Carrier's next-generation refrigerant with a GWP of 466 — 75% lower than R-410A — classified as "mildly flammable" (A2L) by ASHRAE. The 50GE ships with a factory-installed leak detection and dissipation system certified to UL 60335-2-40 that requires no field configuration, but 4Most Energy's technicians follow A2L- specific handling, charging, and commissioning procedures during installation.
Does the 50GE require a bigger electrical service than a gas heat rooftop unit?
Often, yes, when electric heat is installed — resistance heaters draw considerably more current than an equivalent gas heat option, so 4Most Energy always verifies available service capacity and MCA/MOCP requirements before ordering, and flags any service upgrade needed.
Is the 50GE a direct replacement for our existing rooftop unit?
In most cases the unit is designed to fit on existing 3-to-5-ton curbs without modification, though 4Most Energy always verifies curb dimensions, electrical connection points, and structural load before ordering.
How loud is the 50GE, and will it be a problem for occupied space below the roof?
A-weighted outdoor sound is 75.4 dBA on the 3-ton size and 79.0 dBA on the 4- and 5-ton sizes. For sound-sensitive locations, 4Most Energy can advise on curb placement, sizing alternatives, or accessory sound treatment during the quote.
