Carrier WeatherMaster® 50GC Electric Cooling Rooftop Unit – Supplied & Professionally Installed by 4Most Energy
The WeatherMaster® 50GC is a single-package, all-electric rooftop unit built for buildings without gas service or pursuing electrification targets, sized 6.0 to 12.5 nominal tons. Two tandem scroll compressors deliver two-stage electric cooling on a Puron® (R-410A) refrigeration circuit rated up to 17.7 IEER and 12.4 EER, while the patented EcoBlue™ vane axial indoor fan system — direct-drive, electronically commutated, with 75% fewer moving parts than a belt-drive forward-curved fan — cuts fan energy up to 40% and eliminates belt, pulley, and bearing maintenance.
Where heat is required, factory- or field-installed electric resistance heater modules use nickel-chrome open-coil elements with integral overcurrent fusing (protected in circuits not exceeding 48 amps each) and automatic-reset thermal limit controls, with airflow ratings scaling from 1,800–3,000 CFM on the smallest size up to 3,750–6,250 CFM on the 12.5-ton unit. All 50GC units meet DOE 2023 minimum efficiency standards and ASHRAE 90.1/IECC requirements, and are AHRI 340/360 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 208-230/460/575V, 3-phase, along with proper thru-the-base electrical routing and heater circuit breaker coordination.
Roof curb selection (14 in. or 24 in.), structural load review, and field-convertible vertical-to-horizontal airflow configuration (factory kit required on size 14 only) round out the code-driven installation requirements that determine whether the unit’s rated IEER and heater capacity are actually delivered. 4Most Energy is a certified installer for rooftop unit installation Toronto, packaged RTU replacement GTA, and Carrier WeatherMaster 50GC 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 IEER and heater performance figures on the nameplate are what the building actually gets.
Warranty
Carrier backs the WeatherMaster® 50GC with a 3-year limited parts warranty from the factory.
Documents
Why Install the Carrier WeatherMaster® 50GC with 4Most Energy?
- EcoBlueTM vane axial indoor fan system irect-drive ECM motor, 75% fewer moving parts, up to 40% better efficiency, and slow ramp-up for quieter, more reliable operation than belt-drive forward-curved fans.
- Two-stage electric cooling with tandem scroll compressors fully active evaporator coil and mixed air temperature protection on all models, with internal line-break overload protection and rubber-grommet mounting.
- Optional factory- or field-installed electric resistance heat nickel-chrome open-coil elements, integral circuit fusing, magnetic heater contactors, and automatic-reset thermal limit controls in a dedicated insulated heater compartment.
- Optional single-point power kit simplifies electrical connection to one field-supplied power source instead of separate unit and heater circuits.
- Up to 17.7 IEER with 2-speed indoor fan motor no variable frequency drive required to hit this efficiency tier.
- Optional Humidi-MiZer® adaptive dehumidification system sub-cooling and hot gas reheat modes for improved part-load humidity control (07–14 sizes).
- Optional SystemVuTM intelligent controller large multi-line display, USB data port, and built-in i-Vu®, CCN, and BACnet compatibility for building automation integration.
- New unit control board with dial-and-switch indoor fan adjustment, phase reversal/phase loss protection, and quick LED run/alert/fault status.
- Tool-less filter access door and no-strip screw collars throughout for faster service and field repairs.
- Field-convertible horizontal airflow on all models (factory kit required on size 14 only), reducing replacement complexity on legacy curbs.
Carrier 50GC Specifications
| Model | Nominal Tons |
Net Cooling (MBH) |
EER | IEER (2-speed fan) |
Rated CFM |
Sound (dBA, A-wtd) |
Base Unit Weight (lb) |
|---|---|---|---|---|---|---|---|
| 50GC*07 | 6.0 | 72.0 | 12.4 | 17.7 | 2,650 | 82 | 714 |
| 50GC*08 | 7.5 | 90.0 | 12.2 | 17.7 | 3,400 | 82 | 830 |
| 50GC*09 | 8.5 | 96.0 | 12.0 | 17.5 | 3,500 | 82 | 830 |
| 50GC*12 | 10.0 | 114.0 | 11.6 | 17.2 | 3,750 | 87 | 971 |
| 50GC*14 | 12.5 | 146.0 | 12.2 | 16.7 | 5,250 | 83 | 1,313 |
Ratings per AHRI Standards 340/360 at 80°F/67°F wb indoor, 95°F db outdoor.
Electric Heat Airflow Specifications
| Airflow Range | 07 | 08 | 09 | 12 | 14 |
|---|---|---|---|---|---|
| Minimum airflow (CFM) | 1,800 | 2,250 | 2,550 | 3,000 | 3,750 |
| Maximum airflow (CFM) | 3,000 | 3,750 | 4,250 | 5,000 | 6,250 |
The 50GC is sized first by cooling load (6.0–12.5 nominal tons) using a proper commercial load calculation not by matching the tonnage of the unit being replaced, since older rooftop units on the same curb were frequently oversized by the standards of their era.
Where electric heat is required, the heater kW should be matched to the building’s actual heat loss calculation and the unit’s rated minimum-to-maximum airflow range for that size, and confirmed against available electrical service capacity before ordering electric heat draws considerably more current than an equivalent gas heat option and can require a service upgrade on older buildings. Sound-sensitive sites (schools, offices, mixed-use buildings with rooftop-adjacent occupied space) should weigh the 82–87 dBA outdoor sound ratings across sizes into curb placement and unit selection.
4Most Energy performs load calculation, electrical capacity verification, and roof structural review as part of every quote before ordering.
| Step | Title | Description |
|---|---|---|
| Step 1 | Site assessment | existing unit and curb inspection, electrical service capacity check, and roof structural/access evaluation. |
| Step 2 | Load calculation and unit sizing | confirm correct tonnage, electric heater kW (if required), airflow configuration (vertical or horizontal), and control option (standard thermostat or SystemVuTM). |
| Step 3 | Rigging and crane setup | WeatherMaster’s lighter base-rail design and multi-point rigging shackles simplify crane placement onto the existing or new roof curb. |
| Step 4 | Roof curb and 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, where equipped, single-point power kit, sized to the unit’s voltage, phase, and combined unit/heater MCA/MOCP rating, with thru-the-base electrical connections as specified. |
| Step 6 | Ductwork tie-in | supply and return duct connection matched to vertical or horizontal discharge, with turning vanes and sealed transitions. |
| Step 7 | Commissioning | refrigerant charge verification, heater circuit and thermal limit test (if equipped), airflow confirmation, and control system setup (thermostat or SystemVuTM/BAS integration), with warranty registration filed. |
| Step 8 | Final walkthrough | filter access, service clearances, and control operation demonstrated before the crew leaves site. |
Carrier’s standard coverage on the WeatherMaster® 50GC 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, and condensate drain pan/trap inspection. 4Most Energy offers scheduled maintenance plans covering filter changes, heater circuit testing, refrigerant circuit 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 50GC over the gas heat 48GC?
The 50GC 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 48GC during the quote.
Does the 50GC 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 50GC a direct replacement for our existing rooftop unit?
In most cases the unit is designed to fit on legacy Carrier R-410A curbs and many competitor curbs without modification, though 4Most Energy always verifies curb dimensions, electrical connection points, and structural load before ordering.
How loud is the 50GC, and will it be a problem for occupied space below the roof?
A- weighted outdoor sound ranges from 82 dBA (sizes 07–09 and 14) to 87 dBA (size 12). For sound-sensitive locations, 4Most Energy can advise on curb placement, sizing alternatives, or accessory sound treatment during the quote.
Does the 50GC support building automation system integration?
Yes — the optional SystemVuTM controller provides built-in i-Vu®, BACnet, and Carrier Comfort Network (CCN) capability, or the unit can operate on a conventional thermostat with standalone controls.
