Carrier Aquazone™ 50WC Horizontal Water Source Heat Pump – Supplied & Professionally Installed by 4Most Energy
The Aquazone™ 50WC Horizontal is engineered equipment: AHRI certified to ISO 13256-1, ETL/Intertek listed, and built around Puron Advance™ (R-454B) refrigerant with a GWP of 465 — well under U.S. EPA and Canadian regulatory limits of 700. The unit's double-isolated rotary compressor (sizes 007–030) or scroll compressor (024–070) rides on a floating basepan with rubber grommet isolation, and a stainless steel drain pan with a factory-installed condensate overflow sensor protects against the corrosion and cracking that shortens the life of steel or plastic pans. Factory-installed hanger bracket kits, a field-convertible discharge (straight-through or end blow), and a 1-inch supply air duct-flange connection are built into every horizontal unit for a straightforward ceiling retrofit.
None of that performance is realized without correct installation. A 50WC Horizontal replacement or new install requires water loop balancing to the unit's rated 1.5–4.0 GPM per ton, duct collar sizing and acoustic lining matched to the unit's rated CFM, and ESA-compliant electrical work sized to the correct MCA/MOCP for the unit's voltage configuration — anything from 115V single-phase to 575V three-phase depending on size. Because horizontal units are not internally trapped from the factory, an external condensate trap and a 1/4-inch-per-foot drain pitch are required at installation — a detail that's easy to miss and a common cause of nuisance shutdowns when skipped. R-454B is a mildly flammable (A2L) refrigerant; installation and service must be performed by a licensed refrigeration mechanic under Ontario's refrigeration trade requirements, which 4Most Energy provides on every job.
Most of the horizontal units still in service across GTA office, retail, and condo ceilings today are legacy Carrier 50PCH, McQuay CCH0, or Daikin WCCW/WGCH models — the Aquazone 50WC Horizontal matches the ceiling-suspended footprint, duct collar locations, and water loop connections these older units used, so a straight-across swap is the standard job, not the exception. 4Most Energy is a certified installer for water source heat pump installation Toronto, water source heat pump replacement GTA, and Carrier Aquazone 50WC installation Ontario projects, and provides licensed gas technician near me and ENERGY STAR water source heat pump Toronto–calibre service across the region — so the unit's rated performance is what you actually get, not just what's on the spec sheet.
Carrier Water Source 50WC-3PD
Warranty
Carrier backs every Aquazone™ 50WC Horizontal unit with a standard 12-month parts warranty from start-up (or 18 months from ship date, whichever occurs first), plus a compressor parts warranty of up to 5 years from shipping. Optional extended warranty coverage is available at the time of purchase. 4Most Energy handles warranty registration and the required Check, Test & Start documentation on your behalf.
- Puron Advance™ (R-454B) low-GWP refrigerant — GWP of 465, well under EPA/regulatory limits of 700.
- Double-isolated rotary (007–030) or scroll (024–070) compressor on a floating basepan with rubber grommet mounting for exceptionally quiet operation.
- Stainless steel drain pan with factory-installed condensate overflow sensor.
- Field-convertible discharge — straight-through or end blow (sizes 015–070), simplifying retrofits into existing ductwork without additional components.
- Factory-installed hanger bracket kits with heavy-duty steel brackets and rubber grommets for sound and vibration isolation from the building structure.
- Three fan motor options — PSC (3-speed, standard), Constant Torque ECM, and Constant Airflow ECM (constant CFM delivery, sizes 015–070).
- Copper coaxial refrigerant-to-water heat exchanger, with cupronickel available for open tower, geothermal, or higher-corrosion water loops.
- Unit Protection Module (UPM) standard — high/low refrigerant pressure protection, air and water coil freeze protection, condensate overflow shutdown, and intelligent alarm reset.
- Optional hot gas reheat (HGRH), hot gas bypass (HGBP), and waterside economizer (WSE) for free cooling when loop water is between 40–65°F.
- Optional Carrier i-Vu® TruVu™ DDC controller with BACnet® IP connectivity for building automation integration.
- AHRI Certified (ISO 13256-1), ETL/Intertek Listed.
Technical Specifications
| Parameter | Value |
|---|---|
| Refrigerant | R-454B (Puron Advance™, A2L, GWP 465) |
| Heat exchanger | Copper coaxial standard; cupronickel optional |
| Fan motor | PSC standard; Constant Torque ECM or Constant Airflow ECM optional |
| Minimum operating water flow | 1.5 GPM/ton |
| Standard entering water temp range (water loop) | 50°F–80°F (rated); extended range 20°F–110°F |
| Ground loop / ground water entering temp | 32°F–77°F (ground loop); 50°F–59°F (ground water) |
| Maximum water working pressure | 400 psig standard; 300 psig with factory 2-way valve option |
| Controller | Unit Protection Module (UPM) standard; Carrier i-Vu® TruVu™ DDC optional (BACnet® IP) |
| Electrical protection | 5 kA SCCR standard; 65 kA SCCR optional |
| Filtration | 1" MERV 5 standard; optional 2" MERV 8, 2" MERV 13, or 4" MERV 13 |
| Cabinet finish | Heavy gauge galvanized steel |
| Certifications | AHRI Certified (ISO 13256-1), ETL/Intertek Listed, CSA C22.2 No. 60335-2-40 |
50WC Horizontal units are sized by nominal cooling capacity (sizes 007 through 070, corresponding to ½ through 6 tons — see the size table).
Correct sizing depends on the served zone's square footage, glazing/exposure, occupancy, and the existing ductwork's airflow capacity — not simply matching the nameplate of the unit being removed, since legacy Carrier 50PCH, McQuay CCH0, and Daikin WCCW/WGCH units were sometimes oversized by the standards of their era. Because the 50WC is available with rotary or scroll compressors and three different fan motor options, 4Most Energy's load calculation also confirms the correct compressor type, motor option, and discharge orientation for your ceiling cavity before ordering. If the space has a history of humidity complaints or the water loop can sustain 40–65°F temperatures, the hot gas reheat or waterside economizer options should be evaluated during sizing.
Model Sizes at a Glance — 50WC Horizontal
| Size Code | Nominal Capacity | Compressor Type | Approx. Operating Weight | Approx. Shipping Weight |
|---|---|---|---|---|
| 007 | ½ ton (7,000 Btuh) | Rotary | 98 lb | 130 lb |
| 009 | ¾ ton (9,000 Btuh) | Rotary | 106 lb | 135 lb |
| 012 | 1 ton (12,000 Btuh) | Rotary | 114 lb | 143 lb |
| 015 | 1¼ ton (15,000 Btuh) | Rotary | 147 lb | 169 lb |
| 018 | 1½ ton (18,000 Btuh) | Rotary | 155 lb | 189 lb |
| 024 | 2 ton (24,000 Btuh) | Rotary or Scroll* | 183 lb | 214 lb |
| 030 | 2½ ton (30,000 Btuh) | Rotary or Scroll* | 187 lb | 221 lb |
| 036 | 3 ton (36,000 Btuh) | Scroll | 205 lb | 250 lb |
| 042 | 3½ ton (42,000 Btuh) | Scroll | 213 lb | 247 lb |
| 048 | 4 ton (48,000 Btuh) | Scroll | 267 lb | 292 lb |
| 060 | 5 ton (60,000 Btuh) | Scroll | 285 lb | 315 lb |
| 070 | 6 ton (70,000 Btuh) | Scroll | 296 lb | 345 lb |
- Site assessment — existing unit inspection (brand, model, condition), water loop and electrical evaluation, ductwork condition check.
- Load calculation and unit sizing — confirm correct 50WC Horizontal size, compressor type, fan motor option, and discharge orientation.
- Ceiling access and lift setup — open the ceiling tile or cut a drywall access panel above the unit and position a lift to safely reach and support the equipment.
- Isolation and disconnection — lockout/tagout of electrical and water loop; safe removal of the old unit, with refrigerant recovery if applicable.
- Suspension and mounting — new hanger rods, brackets, and vibration isolators installed to structural requirements.
- Water piping and ductwork connections — braided stainless supply/return hoses, isolation valves/strainer, an external condensate trap sloped at 1/4" per foot toward the drain, and duct collar tie-in with acoustic lining.
- Electrical connection — ESA-compliant hookup to the building's dedicated circuit and disconnect, sized to the unit's rated MCA/MOCP.
- Commissioning — flow rate, temperature differential, refrigerant circuit verification, and (if equipped) TruVu™ DDC or option card configuration, with warranty registration filed.
- Ceiling close-up, patch, and paint — the access opening is closed, drywall patched, and painted to match the surrounding ceiling before the crew leaves site.
Standard warranty: 12 months parts from start-up or 18 months from ship date, whichever occurs first, plus a 5-year compressor parts warranty. Optional extended warranty coverage is available at purchase — 4Most Energy will review the right level of coverage for your building's usage profile.
Ongoing maintenance is minimal: fan motors are permanently lubricated on most configurations and require no oiling. Filters should be checked every 60 days initially and adjusted to your building's actual lint/dust load thereafter; the stainless steel condensate drain pan should be inspected annually; since horizontal units use an external condensate trap, that trap and drain line pitch should be checked at every service visit. 4Most Energy offers scheduled maintenance plans that cover filter changes, condensate pan inspection, refrigerant circuit checks, and annual performance logging.
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
How do I know if I even have this type of unit?
Look for a removable ceiling tile or small access panel with no visible equipment in the room — just a grille or duct register. If a technician has ever opened that panel to change a filter, that's this unit.
Is the Aquazone 50WC Horizontal a direct replacement for my existing unit?
In most cases, yes — including for the legacy Carrier 50PCH series, McQuay CCH0 series, and Daikin WCCW/WGCH series units that make up most of the horizontal water source heat pumps still in service across GTA ceilings. The ceiling-suspended footprint, duct collar locations, and water connections on these older models are compatible with standard retrofit practice, though 4Most Energy always verifies exact dimensions and discharge configuration before ordering.
What older models does the 50WC Horizontal typically replace?
Most of our horizontal replacement jobs involve swapping out a Carrier 50PCH, McQuay CCH0, or Daikin WCCW/WGCH — the five model families that make up the bulk of what's still installed in GTA office, retail, and condo ceilings from this equipment's earlier generations. We service and replace other brands as well.
Will you need to cut open my ceiling to do the work?
Yes, for a replacement or new install — the unit sits above the ceiling, so we open a tile or cut a drywall access panel, bring in a lift to safely support the equipment, and close, patch, and paint the opening to match your ceiling before we leave. Repairs on an existing unit sometimes only need the existing access panel opened, with no patching required.
Is R-454B refrigerant safe in an occupied building?
Yes — R-454B is a mildly flammable (A2L) refrigerant with a GWP of 465, used safely worldwide in sealed HVAC systems. It must be installed and serviced by a licensed refrigeration mechanic, which 4Most Energy provides on every job.
How long does a typical unit replacement take?
Most single-unit horizontal water source heat pump replacements in occupied condo, office, or hotel space, including ceiling patch and paint, are completed in a single day.
Horizontal Heat Pump
