Kramer 2.5 HP Medium Temperature Walk-In Cooler Refrigeration System
The Kramer KFO250E4SDA outdoor condensing unit and KL6A161ADASC low profile unit cooler form a factory-matched 2.5 HP medium temperature refrigeration package for walk-in coolers up to roughly 16 ft × 24 ft. A ZS19KAE scroll compressor is paired with a larger three-fan KL6A161 coil, extending capacity for deeper, higher-throughput rooms. Configured for R448A or R449A refrigerant, it is built for supermarket back rooms, produce and floral distribution, commissary kitchens, and beverage warehousing.
Is a 2.5 HP Refrigeration System the Right Size?
This package suits medium temperature coolers up to about 16 ft × 24 ft holding 35°F to 38°F. At 25°F suction on R448A or R449A the KFO250E4SDA produces 18,770 BTUH at a 95°F ambient, with a matched system rating near 18,800 BTUH at 25°F SST — roughly 380 square feet of well-insulated cooler at average usage.
The larger KL6A161 coil and higher airflow keep temperature even across a longer room, and the system holds 16,480 BTUH at a 110°F ambient for hot outdoor locations. As always, door traffic and daily product load move the requirement, so heavy-use rooms should size down a step and every job is best confirmed with a calculated load.
Ideal for: supermarket and grocery back rooms, produce and floral distribution, commissary and catering operations, craft breweries, and beverage warehousing.
Representative box sizes: this package is commonly applied to coolers such as 18 ft × 20 ft, 14 ft × 24 ft, and 16 ft × 24 ft.
Need more capacity? Step up to the Kramer 3 HP KFO300E4SDA & KL6A235ADASC Refrigeration System. For a smaller room, see the Kramer 2 HP KFO200E4SDA & KL6A141ADASC 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 | KFO250E4SDA — 2.5 HP Medium Temperature Condensing Unit |
|---|---|
| Indoor Evaporator | KL6A161ADASC Low Profile Unit Cooler |
| Application | Medium Temperature Walk-In Cooler Refrigeration System |
| System Capacity | Approximately 18,800 BTUH matched system (R448A/R449A, 25°F S.T., 10.0°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 KFO250E4SDA condensing unit and the KL6A161ADASC 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
KFO250E4SDA Outdoor Condensing Unit
- 2.5 HP ZS19KAE scroll compressor for medium temperature commercial refrigeration
- 18,770 BTUH at 95°F ambient and 25°F suction on R448A or R449A
- 16,480 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 16.2 rated load amps and 75 locked rotor amps, on a 22.3 amp minimum circuit ampacity with 35 amp maximum overcurrent protection
KL6A161ADASC Low Profile Unit Cooler
- 18,800 BTUH with R448A or R449A at 25°F SST and 10°F TD, and 16,100 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
- Three balanced aluminum fans moving 2,355 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 walk-in cooler does the KFO250E4SDA cover?
Medium-temperature coolers up to about 16 ft × 24 ft holding 35°F to 38°F, including deeper, higher-throughput rooms. Size from a calculated load.
How is the KFO250E4SDA different from the 2 HP KFO200E4SDA?
A larger ZS19KAE compressor and the three-fan KL6A161 coil raise matched capacity from about 16,789 to 18,800 BTUH at 25°F SST, supporting a deeper room and stronger recovery under heavy loading.
Is a three-phase version of this system available?
Yes. The single-phase model shown here is the KFO250E4SDA; the equivalent 208-230V three-phase condensing unit is the KFO250E4SEA. Choose based on the power available at the site.
Does the KFO250E4SDA ship with a refrigerant charge?
No. The condensing unit and coil ship under a nitrogen holding charge; R-448A or R-449A is added in the field during evacuation, charging, and commissioning by an EPA 608 certified technician.
Will it keep running in cold outdoor weather?
Yes. Flooded head pressure control is standard, maintaining head pressure so the system continues to operate as the outdoor ambient falls.
Is air defrost appropriate at this size?
Yes. For a cooler held at 35°F and warmer, off-cycle air defrost clears the coil, regardless of system size, so no defrost heaters are needed.
Kramer KFO Condenser Technical SpecificationsKramer Installation GuideKramer Maintenence ManualKramer KL6 Technical SpecificationsKramer KL6 CatalogKramer Warranty
