Kramer 3/4 HP Medium Temperature Walk-In Cooler Refrigeration System
The Kramer KFO080M4SDA outdoor condensing unit and KL6A066ADASC low profile unit cooler form a factory-matched medium temperature package rated at 7,800 BTUH with R448A or R449A refrigerant at 25°F suction and a 10°F TD. A 3/4 HP ZB07KAE scroll compressor drives a two-circuit distributor-fed evaporator coil, adding roughly thirty percent more capacity than the 1/2 HP package without growing the cabinet. It suits busier walk-in coolers in restaurants, grocery and specialty food stores, convenience stores, breweries and taprooms, commissary kitchens, and produce or dairy storage rooms.
Is a 3/4 HP Refrigeration System the Right Size?
This package targets refrigeration loads around 7,800 BTUH, which typically fits a well-insulated medium temperature box up to roughly 8 ft × 8 ft holding 35°F to 38°F. It is most often chosen not because a box grew, but because the work inside it did. A cooler that holds temperature comfortably on 1/2 HP during slow months can fall behind once daily deliveries increase, warm product is loaded in volume, or door traffic climbs through a busy service period.
Load is driven by insulation R-value, the outdoor ambient the condensing unit sees, door-opening frequency, the quantity and entering temperature of product loaded each day, target box temperature, and how quickly the box must recover after a delivery. The 3/4 HP unit also holds capacity better as ambient climbs, still producing meaningful cooling at 100°F and 110°F outdoor design conditions, which matters for rooftop and unshaded slab installations in hot climates. Confirm the selection against a calculated load rather than floor area.
Ideal for: Higher-turnover walk-in coolers in full-service restaurants and commissary kitchens, grocery and specialty food retailers, convenience stores, craft breweries and taprooms, wineries, catering operations, florists, and produce, dairy, or beverage storage rooms.
Need more capacity? Step up to the Kramer 1 HP KFO100M4SDA & KL6A073ADASC Refrigeration System for larger medium-temperature walk-in cooler applications requiring additional refrigeration capacity. For smaller boxes with lighter product turnover, the Kramer 1/2 HP KFO060M4SDA & KL6A052ADASC system may be the better match.
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 | KFO080M4SDA — 3/4 HP Medium Temperature Condensing Unit |
|---|---|
| Indoor Evaporator | KL6A066ADASC Low Profile Unit Cooler |
| Application | Medium Temperature Walk-In Cooler Refrigeration System |
| 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 |
A useful detail for anyone replacing an existing 1/2 HP Kramer package: the KFO080M4SDA condensing unit uses the same FM1 cabinet, the same approximate 195 lb shipping weight, the same 3/8 in. liquid and 5/8 in. suction connections, and the same 15 amp minimum circuit ampacity and maximum overcurrent protection as the 1/2 HP model. In practice the existing pad, mounting, line set specification, and breaker generally carry over. The KL6A066ADASC evaporator also shares the 27-1/8 in. cabinet width and two-point hanger spacing of the smaller coil. Both units ship under a nitrogen holding charge, so plan on field-supplied R-448A or R-449A refrigerant and commissioning by an EPA 608 certified technician.
Condensing Unit & Evaporator Features
KFO080M4SDA Outdoor Condensing Unit
- 3/4 HP ZB07KAE scroll compressor rated for medium temperature duty
- 8,020 BTUH at 95°F ambient and 25°F suction on R448A or R449A, holding 7,070 BTUH at 110°F ambient
- 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 5.6 rated load amps and 48 locked rotor amps, on a 15 amp minimum circuit ampacity
- Compact FM1 cabinet at 28-1/4 in. deep by 27-7/8 in. wide by 18-3/4 in. high, approximately 195 lb, 70 dBA at 10 ft, AWEF 7.60
KL6A066ADASC Low Profile Unit Cooler
- 7,800 BTUH with R448A or R449A at 25°F SST and 10°F TD, and 6,600 BTUH on R404A
- Two-circuit coil fed by a refrigerant distributor with a 1/2 in. connection, improving refrigerant distribution across the face of the coil
- Factory-mounted SBFSE-AA-C thermostatic expansion valve, selected for R448A and R449A service
- Single heavy-duty 12 in. balanced aluminum fan moving 775 CFM through a draw-through air pattern
- Dual-speed electronically commutated 115V motor 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, with slide-out end panels for front or side service access
- 27-1/8 in. wide by 18-1/8 in. high by 15-1/2 in. deep, approximately 47 lb, two hanger slot locations, AWEF 9.00, 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 is the KFO080M4SDA designed for?
This package matches a refrigeration load near 7,800 BTUH, which commonly corresponds to a properly insulated medium temperature box up to roughly 8 ft × 8 ft holding 35°F to 38°F. Product turnover and door traffic influence the requirement as much as floor area, so verify the selection against a calculated load.
How is the KFO080M4SDA different from the 1/2 HP KFO060M4SDA?
The 3/4 HP unit uses a larger ZB07KAE scroll compressor and pairs with a two-circuit distributor-fed evaporator instead of the single-feed coil used on the 1/2 HP package, raising matched capacity from 6,000 BTUH to 7,800 BTUH. Both share the same FM1 cabinet, connection sizes, and 15 amp circuit requirement, so the added capacity does not require a larger pad or a heavier electrical service. Locked rotor amps do rise from 35.7 to 48, which is worth noting when sizing generator backup or evaluating long conductor runs.
What refrigerant does the KFO080M4SDA system use?
This Kramer refrigeration package is configured for R448A and R449A refrigerants, which are commonly used in modern commercial medium-temperature refrigeration applications.
Does this system ship with refrigerant?
No. Both the condensing unit and the evaporator ship with a nitrogen holding charge only. R-448A or R-449A refrigerant is field supplied, and the system must be evacuated, charged, and commissioned by an EPA 608 certified technician.
Is this system designed for walk-in freezers?
No. This package is designed for medium-temperature walk-in coolers. Freezer applications require refrigeration equipment designed for lower operating temperatures and appropriate defrost methods.
Can the KFO080M4SDA condensing unit be installed outdoors?
Yes. The KFO080M4SDA is designed as an outdoor condensing unit rated for ambient air temperatures up to 110°F, while the KL6A066ADASC evaporator installs inside the walk-in cooler.
What businesses commonly use this refrigeration system?
Boxes at this capacity are typical in full-service restaurant and commissary kitchens, grocery and specialty food retailers, convenience stores, craft breweries and taprooms, wineries, catering operations, florists, and produce, dairy, or beverage storage rooms with steady daily turnover.
Kramer KFO Condenser Technical SpecificationsKramer Installation GuideKramer Maintenence ManualKramer KL6 Technical SpecificationsKramer KL6 CatalogKramer Warranty
