Kramer 1 HP Medium Temperature Walk-In Cooler Refrigeration System
The Kramer KFO100M4SDA outdoor condensing unit and KL6A073ADASC low profile unit cooler form a factory-matched medium temperature package rated at 8,500 BTUH with R448A or R449A refrigerant at 25°F suction and a 10°F TD. This is the point in the Kramer lineup where the evaporator steps up to a two-fan cabinet moving 1,600 CFM, roughly double the airflow of the single-fan coils below it, which is what makes even temperature distribution practical across a larger box. It suits high-volume walk-in coolers in restaurant and commissary kitchens, grocery and produce operations, beverage distributors, breweries, catering kitchens, and institutional foodservice.
Is a 1 HP Refrigeration System the Right Size?
This package matches refrigeration loads around 8,500 BTUH, typically a well-insulated medium temperature box up to roughly 10 ft × 10 ft held at 35°F to 38°F. At this size the conversation shifts from raw capacity to air distribution. A hundred square feet of floor area is more than a single-fan coil can cover evenly, and a box with stagnant corners will show temperature stratification and uneven product condition even when total capacity is adequate on paper. The two-fan KL6A073ADASC coil exists to solve that.
Load still depends on insulation R-value, outdoor ambient at the condensing unit, door-opening frequency, and the quantity and entering temperature of product loaded daily. Larger boxes also tend to mean deeper shelving and taller stacking, so plan coil placement and clear air path along with capacity. Kramer specifies 12 in. of clearance from the back wall for this unit cooler. Confirm the final selection against a calculated load rather than floor area alone.
Ideal for: High-volume walk-in coolers in restaurant and commissary kitchens, grocery, produce and specialty food operations, beverage distributors and wholesalers, craft breweries and taprooms, catering kitchens, hotel and banquet operations, and school or hospital foodservice.
Need more capacity? Step up to the Kramer KFO150E4SDA & KL6A094ADASC Refrigeration System for larger medium-temperature walk-in cooler applications requiring additional refrigeration capacity. For smaller boxes served adequately by a single-fan coil, the Kramer 3/4 HP KFO080M4SDA & KL6A066ADASC system may be the better fit.
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 | KFO100M4SDA — 1 HP Medium Temperature Condensing Unit |
|---|---|
| Indoor Evaporator | KL6A073ADASC 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 |
Worth planning around if you are replacing a smaller Kramer package: the outdoor and indoor halves upgrade very differently here. The KFO100M4SDA condensing unit stays in the same compact FM1 cabinet used by the 1/2 HP and 3/4 HP models, at the same approximate 195 lb, the same 3/8 in. liquid and 5/8 in. suction connections, and the same 15 amp minimum circuit ampacity, so the existing pad and breaker usually carry over. The KL6A073ADASC evaporator does not: it widens to 43-5/8 in. with hanger slots spaced 33-1/4 in. apart, so the ceiling hanger layout has to be set new rather than reused. 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
KFO100M4SDA Outdoor Condensing Unit
- 1 HP ZB08KAE scroll compressor, the largest offered in the compact FM1 medium temperature cabinet
- 9,380 BTUH at 95°F ambient and 25°F suction on R448A or R449A, still delivering 8,270 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 7.2 rated load amps and 47.2 locked rotor amps, on a 15 amp minimum circuit ampacity
- 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
KL6A073ADASC Low Profile Unit Cooler
- 8,500 BTUH with R448A or R449A at 25°F SST and 10°F TD, and 7,300 BTUH on R404A
- Two heavy-duty 12 in. balanced aluminum fans moving 1,600 CFM, roughly double the airflow of the single-fan coils in the smaller packages
- Baffled fan sections in the embossed aluminum casing prevent short cycling of discharge air between the two fan bays
- Two-circuit coil fed by a refrigerant distributor with a 1/2 in. connection for even refrigerant distribution across the coil face
- Factory-mounted SBFDE-AA-C thermostatic expansion valve, selected for R448A and R449A service
- Dual-speed electronically commutated 115V motors drawing a combined 1.6 amps, with thermal overload protection and California Title 24 compliance
- 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
- Removable 3/4-14 NPT drain fitting at the center rear of the pan, with slide-out end panels for front or side service access
- 43-5/8 in. wide by 18-1/8 in. high by 15-1/2 in. deep, approximately 52 lb, hanger slots spaced 33-1/4 in. apart, NSF compliant, 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 KFO100M4SDA designed for?
This package matches a refrigeration load near 8,500 BTUH, which commonly corresponds to a properly insulated medium temperature box up to roughly 10 ft × 10 ft holding 35°F to 38°F. At this footprint, airflow coverage matters as much as total capacity, which is why the package uses a two-fan unit cooler. Verify the selection against a calculated load.
How is the KFO100M4SDA different from the 3/4 HP KFO080M4SDA?
The condensing unit moves to a larger ZB08KAE scroll compressor, raising matched capacity from 7,800 BTUH to 8,500 BTUH. The bigger change is on the evaporator: the KL6A073ADASC uses two fans and moves 1,600 CFM, against a single fan and 775 CFM on the 3/4 HP package, in a cabinet that widens from 27-1/8 in. to 43-5/8 in. The outdoor unit keeps the same FM1 footprint and 15 amp circuit requirement, but the coil requires a new ceiling hanger layout because slot spacing changes from 17-1/4 in. to 33-1/4 in.
What refrigerant does the KFO100M4SDA system use?
This Kramer refrigeration package is configured for R448A and R449A refrigerants, which are commonly used in modern commercial medium-temperature refrigeration applications.
Why does this system use a two-fan evaporator?
A single-fan unit cooler cannot distribute air evenly across a box approaching 10 ft × 10 ft, which leads to warm corners and uneven product temperatures even when total system capacity is sufficient. The KL6A073ADASC uses two fans and baffled fan sections to spread 1,600 CFM across a wider discharge face, keeping temperatures more uniform through the space.
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 KFO100M4SDA condensing unit be installed outdoors?
Yes. The KFO100M4SDA is designed as an outdoor condensing unit rated for ambient air temperatures up to 110°F, while the KL6A073ADASC evaporator installs inside the walk-in cooler, mounted flush to the ceiling with 12 in. of clearance from the back wall.
What businesses commonly use this refrigeration system?
Boxes at this capacity are typical in restaurant and commissary kitchens, grocery, produce and specialty food operations, beverage distributors and wholesalers, craft breweries and taprooms, catering kitchens, hotel and banquet operations, and school or hospital foodservice.
Kramer KFO Condenser Technical SpecificationsKramer Installation GuideKramer Maintenence ManualKramer KL6 Technical SpecificationsKramer KL6 CatalogKramer Warranty
