Kramer 3 HP Medium Temperature Walk-In Cooler Refrigeration System
The Kramer KFO300E4SDA outdoor condensing unit and KL6A235ADASC low profile unit cooler form a factory-matched 3 HP medium temperature refrigeration package for large walk-in coolers up to roughly 20 ft × 32 ft. A ZS21KAE scroll compressor drives a single high-capacity four-fan KL6A235 coil, a significant jump in capacity that serves warehouse-scale cooler rooms. Configured for R448A or R449A refrigerant, it fits grocery distribution, large produce and beverage operations, central commissaries, and cold storage.
Is a 3 HP Refrigeration System the Right Size?
This package is matched to medium temperature coolers up to about 20 ft × 32 ft holding 35°F to 38°F. At 25°F suction on R448A or R449A the KFO300E4SDA produces 27,960 BTUH at a 95°F ambient, with a matched system rating near 28,078 BTUH at 25°F SST — on the order of 640 square feet of well-insulated cooler at average usage.
The four-fan KL6A235 is the largest single coil in this line, spreading a high airflow across a big room to hold temperature evenly. The system delivers 24,950 BTUH at a 110°F ambient for hot installations. Warehouse rooms with dock doors and constant traffic carry heavier loads, so confirm the selection with a calculated heat load.
Ideal for: grocery and food distribution, large produce and beverage operations, central commissary kitchens, and commercial cold storage.
Representative box sizes: this package is commonly applied to coolers such as 20 ft × 20 ft, 18 ft × 24 ft, 20 ft × 24 ft, 20 ft × 28 ft, and 20 ft × 32 ft.
Need more capacity? Step up to the Kramer 3.5 HP KFO350E4SDA & KL6A235ADASC Refrigeration System. For a smaller room, see the Kramer 2.5 HP KFO250E4SDA & KL6A161ADASC system.
Recommended refrigeration applications are general guidelines only. Actual system requirements depend on insulation, ambient conditions, door openings, product load, and operating temperature. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Condensing Unit | KFO300E4SDA — 3 HP Medium Temperature Condensing Unit |
|---|---|
| Indoor Evaporator | KL6A235ADASC Low Profile Unit Cooler |
| Application | Medium Temperature Walk-In Cooler Refrigeration System |
| System Capacity | Approximately 28,078 BTUH matched system (R448A/R449A, 25°F S.T., 10.1°F TD) |
| Refrigerant | R448A or R449A |
| Compressor | High-Efficiency Scroll Compressor |
| Evaporator Defrost | Air Defrost |
| Electrical | 208-230V, Single Phase, 60 Hz Condensing Unit |
| Evaporator Electrical | 115V |
| Factory Charge | Nitrogen Holding Charge — Refrigerant Field Supplied |
| Manufacturer Warranty | 1 Year |
The KFO300E4SDA condensing unit and the KL6A235ADASC low profile evaporator are also stocked individually for replacement work. Ordering them together as this matched package keeps the condensing unit and coil capacities aligned at design conditions. All units ship under a nitrogen holding charge, so plan on field-supplied R-448A or R-449A refrigerant and evacuation, charging, and commissioning by an EPA 608 certified technician.
Condensing Unit & Evaporator Features
KFO300E4SDA Outdoor Condensing Unit
- 3 HP ZS21KAE scroll compressor for medium temperature commercial refrigeration
- 27,960 BTUH at 95°F ambient and 25°F suction on R448A or R449A
- 24,950 BTUH still available at 110°F ambient and 25°F suction for rooftop and unshaded slab installations
- Integral liquid sub-cooling circuit providing an average 3°F to 5°F of sub-cooling for improved efficiency and stable expansion valve operation
- Flooded head pressure control standard, supporting operation as outdoor ambient temperatures drop
- Generously sized condenser coil with enhanced copper tubes and aluminum fins in an all-weather painted galvanized steel housing
- Ships under a nitrogen holding charge, with a refrigerant receiver, isolation valve, and pressure relief plug
- Liquid line with sealed filter and sight glass, factory crankcase heater, and electronic air defrost timer
- Fixed high-pressure and adjustable low-pressure controls, with quick-access shut-off valves and color-coded point-to-point wiring
- 208-230V single phase draw of 20.8 rated load amps and 112 locked rotor amps, on a 32.2 amp minimum circuit ampacity with 50 amp maximum overcurrent protection
KL6A235ADASC Low Profile Unit Cooler
- 27,800 BTUH with R448A or R449A at 25°F SST and 10°F TD, and 23,500 BTUH on R404A
- Multi-circuit coil fed by a refrigerant distributor for even refrigerant distribution across the coil face
- Factory-mounted thermostatic expansion valve, selected for R448A and R449A service
- Four balanced aluminum fans moving 3,140 CFM through a draw-through air pattern
- Dual-speed electronically commutated 115V motors with thermal overload protection, compliant with California Title 24
- 6 fins-per-inch coil using 3/8 in. enhanced copper tubes mechanically expanded into corrugated aluminum fins with die-formed collars
- Air defrost configuration intended for coolers held at 35°F and warmer, factory wired to screw-type terminal strips
- Embossed aluminum casing with baffled fan sections, NSF compliant and designed to mount flush to the ceiling
- Removable 3/4-14 NPT drain fitting at the bottom of the pan, replaceable without changing the pan
- 3/8 in. liquid and 5/8 in. suction connections, UL and cUL listed
Specifications & Manuals
Product documentation includes technical specifications, installation information, maintenance instructions, warranty information, and KL6 Series literature to assist with equipment selection, installation, and service. This system carries a 1 year manufacturer warranty; see the Kramer warranty documentation above for full coverage terms and conditions.
Frequently Asked Questions
What size cooler is the KFO300E4SDA designed for?
Large medium-temperature coolers up to about 20 ft × 32 ft holding 35°F to 38°F. At warehouse scale a computed heat load is strongly recommended.
How is the KFO300E4SDA different from the 2.5 HP KFO250E4SDA?
It is a large step up: a ZS21KAE compressor and the four-fan KL6A235 coil raise matched capacity from about 18,800 to 28,078 BTUH at 25°F SST, extending coverage to roughly 20 ft × 32 ft.
Why does the KFO300E4SDA use a four-fan coil?
The KL6A235 is the largest single coil in this line. Four fans move about 3,140 CFM to spread cold air across a big room, which is what holds temperature evenly in a warehouse-scale cooler.
What size breaker does the KFO300E4SDA require?
The condensing unit calls for a 32.2 amp minimum circuit ampacity and a 50 amp maximum overcurrent protection on a dedicated 208-230V single-phase circuit; the evaporator is powered separately at 115V.
Can this system run on R-404A instead of R448A/R449A?
This package is configured and rated for R448A and R449A. R-404A is being phased down under refrigerant regulations, which is why Kramer builds these systems for the lower-GWP R448A/R449A blends.
What facilities typically run a system this size?
Grocery and food distribution, large produce and beverage operations, central commissary kitchens, and commercial cold storage.
Kramer KFO Condenser Technical SpecificationsKramer Installation GuideKramer Maintenence ManualKramer KL6 Technical SpecificationsKramer KL6 CatalogKramer Warranty
