York® Series 20 ZR (J**ZR) Packaged Rooftop Unit with Hot Gas Reheat – Supplied & Professionally Installed by 4Most Energy
The York Series 20 ZR (J**ZR) is a large-tonnage packaged rooftop unit purpose-built for applications that need active humidity control. Every unit ships with a factory-standard hot gas reheat coil (17.2 sq. ft. face area, 2-row), so no field-installed dehumidification accessory is required. It is rated up to 11.2 EER and 13.2 IEER across three sizes — J15ZR, J20ZR and J25ZR (15, 20 and 25 nominal tons) — with gross cooling capacities from 189,000 to 303,000 Btu/h. Dual independent refrigerant circuits with scroll compressors (50/100% capacity steps) and split-face condenser coils are standard on R-410A refrigerant. Balanced two-stage gas heat delivers 80% steady-state efficiency through aluminized steel (standard) or stainless steel (optional) tubular heat exchangers. The unit is also available cooling-only or with electric heat, and is manufactured by Johnson Controls in an ISO 9001 certified facility.
Reliable dehumidification depends on correct field installation. Ontario installations require verified roof curb structural capacity for units up to 2,760 lb, a properly sized gas line and venting for two-stage combustion up to 400 MBH input, and electrical service matched to the unit's 208/230/460/575V, 3-phase rating. Reheat coil charge, combustion setup, and structural curb support must be commissioned correctly, or the unit will underperform against its rated capacity. 4Most Energy's licensed gas technicians perform combustion analysis, dual-circuit refrigerant charge verification, and Smart Equipment™ controller commissioning on every large-tonnage packaged rooftop unit installation in Toronto and across the GTA, with each installation documented for TSSA and ESA compliance.
Replacement Option
The York® Series 20 J**ZR can replace older Trane, Lennox, Daikin, Rheem, and AAON large-tonnage packaged rooftop units using an appropriate roof curb adapter, letting building owners upgrade to humidity-controlled cooling without modifying existing roof penetrations or ductwork. It shares a common footprint with the Series 20 J**ZJ (high efficiency) and Series 20 J**ZF (standard efficiency) lines; if your space does not need reheat, the J**ZJ will typically deliver lower operating costs.
Warranty
York backs the Series 20 J**ZR with a 1-year complete unit warranty, a 5-year compressor warranty, and a 10-year aluminized steel gas heat exchanger warranty (stainless steel heat exchanger available as a factory option). 4Most Energy handles startup, combustion test documentation, and warranty registration on your behalf.
Documents
Why Install the York Series 20 J**ZR with 4Most Energy?
Gas Heat & Combustion Expertise
Licensed TSSA gas technicians size the gas line for two-stage heat up to 400 MBH, verify supply pressure, and complete combustion analysis at startup.
Proper System Sizing
We start with a commercial block load calculation, then confirm tonnage, gas heat input, and electrical and gas capacity before ordering.
Professional Rooftop Installation
Crane rigging at all four base-rail corners, curb verification, ductwork, gas, electrical, and controls coordinated in one project.
Reheat Coil Commissioning
Hot gas reheat setup and dual-circuit R-410A charge verification so the unit controls humidity and delivers its rated cooling capacity.
Transparent Installation Planning
Before installation, we review the existing rooftop unit, curb, gas and electrical service, and access requirements, so your quote reflects the real scope of work.
Ongoing Maintenance Support
Semi-annual (spring and fall) reheat and evaporator coil cleaning, dual-circuit charge checks, belt and filter replacement, combustion analysis, and Smart Equipment™ diagnostics.
- Factory-standard hot gas reheat coil on every J**ZR model — dedicated humidity control without a separate field-installed accessory, ideal for large retail, medical, institutional, and high-occupancy spaces.
- Large-capacity cooling up to 11.2 EER and 13.2 IEER across 15, 20, and 25 nominal ton sizes.
- Dual independent refrigerant circuits scroll compressors provide 50/100% capacity steps for staged, efficient operation.
- Split-face condenser coils with 3/8-inch copper tube / aluminum fin evaporator coils for proven reliability at large tonnage.
- Balanced two-stage gas heat 80% steady-state efficiency with aluminized steel (standard) or stainless steel (optional) tubular heat exchangers.
- Smart Equipment™ control platform on-board diagnostics, fault message display, anti-short-cycle protection, and BACnet MS/TP, Modbus, N2, and Verasys communication.
- Convertible duct connections bottom or horizontal connections, field-configurable without panel cutting.
- Full-perimeter base rails corner rigging holes for reliable overhead crane placement.
- Low-ambient capability compressor operation down to 25°F as standard, extended to 0°F with an accessory low-ambient kit.
- Common Series 20 footprint shared with the J**ZJ and J**ZF lines for mixed-fleet servicing and simplified roof curb planning.
Series 20 J**ZR Specifications
| Model | Nominal Tons | Gross Cooling (Btu/h) | Net Cooling (Btu/h) | EER | Max IEER (IntelliSpeed) | Hot Gas Reheat Coil | Refrigerant Circuits | Compressor Steps | Gas Heat Efficiency | Sound (dBA, AHRI 270) |
|---|---|---|---|---|---|---|---|---|---|---|
| J15ZR | 15 | 189,000 | 180,000 | 11.2 | 13.2 | Standard | 2 | 50/100% | 80% | 92 |
| J20ZR | 20 | 243,000 | 228,000 | 11.0 | 13.2 | Standard | 2 | 50/100% | 80% | 92 |
| J25ZR | 25 | 303,000 | 288,000 | 10.0 | 12.3 | Standard | 2 | 50/100% | 80% | 92 |
Baseline configuration shown: standard-static constant-volume indoor blower, no electric heat, two-stage gas heat. High-static blowers, electric heat,
and other gas heat sizes are available. Ratings per AHRI standards; outdoor sound per AHRI Standard 270.
| Physical & Electrical Data | J15ZR | J20ZR | J25ZR |
|---|---|---|---|
| Nominal airflow (CFM) | 5,000 | 6,000 | 7,600 |
| System power (kW) | 14.40 | 20.10 | 28.50 |
| Dimensions L × W × H (in.) | 180-19/32 × 92 × 52-5/8 | 180-19/32 × 92 × 52-5/8 | 180-19/32 × 92 × 52-5/8 |
| Operating weight (lb) | 2,360 | 2,660 | 2,760 |
| Roof curb height (in.) | 14 | 14 | 14 |
| Electrical service | 208/230/460/575V, 3-phase | 208/230/460/575V, 3-phase | 208/230/460/575V, 3-phase |
| Base electrical MCA | Confirmed at quote | Confirmed at quote | Confirmed at quote |
The J**ZR line is offered in three sizes (15, 20 and 25 ton); a 17.5 ton reheat model is not part of the Series 20 lineup. Base electrical MCA figures are model- and voltage-specific (208/230V, 460V, 575V) and are
confirmed at the time of quote based on the exact configuration selected.
Sizing a Series 20 J**ZR begins with a commercial Manual N or equivalent block load calculation, followed by confirmation that dehumidification is a functional requirement. The J**ZR's standard reheat coil is best suited to large retail, medical, laboratory, gymnasium, institutional, or other high-occupancy or moisture-sensitive spaces where independent humidity control matters. If the application does not require reheat, the higher-efficiency Series 20 J**ZJ (same cabinet footprint) will typically deliver lower operating costs. Within the J**ZR line, select nominal tonnage (15, 20 or 25 tons) to match the calculated load, then confirm gas heat input size based on building heating load and available gas service. 4Most Energy's site assessment confirms final model selection against actual roof curb, electrical, and gas infrastructure before ordering.
Installation & Assessment Checklist
| Phase | Description & Key Requirements | |
|---|---|---|
| Step 1 | Site Assessment | 4Most Energy evaluates roof curb structural capacity, gas line sizing, electrical service, and crane access. |
| Step 2 | Equipment Selection | Confirm the J**ZR model, tonnage, and heat exchanger option based on the load calculation and dehumidification requirements. |
| Step 3 | Permitting | Secure required building, gas, and electrical permits per the Ontario Building Code and the local authority having jurisdiction. |
| Step 4 | Rigging & Placement | The unit is craned into position on the roof curb using the base-rail rigging points at all four corners. |
| Step 5 | Connection & Commissioning | Licensed technicians complete the gas line connection, electrical hookup, ductwork tie-in, dual-circuit refrigerant charge verification, combustion analysis, and Smart Equipment™ controller setup. |
| Step 6 | Final Inspection & Documentation | Startup report, combustion test results, and warranty registration are completed and provided to the building owner. |
York® Series 20 J**ZR units carry a 1-year complete unit parts warranty and a 5-year compressor warranty from the date of installation. The standard aluminized steel gas heat exchanger carries a 10-year warranty, with a stainless steel heat exchanger available as a factory option. Warranty coverage requires professional installation and startup by a licensed contractor, along with documented annual maintenance.
Because the J**ZR's reheat coil operates whenever dehumidification is called for, 4Most Energy recommends semi-annual maintenance visits (spring and fall) rather than the annual visit typical for standard cooling-only units. Maintenance includes reheat coil and evaporator coil cleaning, refrigerant charge verification for both circuits, belt and filter replacement, electrical connection inspection, combustion analysis on gas-heat units, and Smart Equipment™ control board diagnostic review. 4Most Energy offers scheduled maintenance plans that keep this documentation in place for your warranty.
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
What is the difference between the Series 20 J**ZR and the J**ZJ or J**ZF lines?
All three share the same cabinet footprint, but the J**ZR includes a factory-standard hot gas reheat coil for dedicated humidity control, while the Series 20 J**ZJ prioritizes cooling efficiency and the Series 20 J**ZF is the standard-efficiency baseline, neither with a reheat function.
Do I need the reheat coil if I only need cooling and heating?
No. If your space does not have specific humidity control requirements, the higher-efficiency Series 20 J**ZJ line will typically provide lower long-term operating costs in the same footprint.
What sizes does the Series 20 J**ZR come in?
Three sizes: 15, 20, and 25 nominal tons (models J15ZR, J20ZR, and J25ZR). A 17.5 ton reheat variant is not offered in this line.
Can the J**ZR replace my existing large-tonnage rooftop unit without changing the roof curb?
In many cases, yes. The J**ZR shares a common footprint with other Series 20 models, and roof curb adapters are available for transitioning from other manufacturers' curbs. 4Most Energy confirms curb compatibility during the site assessment.
Do you need a crane to install the Series 20 J**ZR?
Yes. At 2,360 to 2,760 lb, the J**ZR is craned onto the roof curb using the base-rail rigging points at all four corners. 4Most Energy plans the lift and crane access during the site assessment and includes it in your quote.
What maintenance does the Series 20 J**ZR need?
Because the reheat coil runs whenever dehumidification is called for, we recommend semi-annual visits (spring and fall): reheat and evaporator coil cleaning, refrigerant charge verification on both circuits, belt and filter replacement, electrical inspection, combustion analysis on gas-heat units, and a Smart Equipment™ diagnostic review.
Are there energy rebates available for a Series 20 J**ZR installation in Ontario?
Rebate eligibility depends on the efficiency tier and the specific commercial program's thresholds, so 4Most Energy confirms current utility incentive eligibility at the time of quote. Residential programs do not apply to commercial rooftop equipment.
