Kramer 5 HP Medium Temperature Walk-In Cooler Refrigeration System
The Kramer KFO500E4SDA outdoor condensing unit and two KL6A181ADASC low profile unit coolers form a factory-matched 5 HP medium temperature refrigeration package for the largest walk-in coolers in this line, at and beyond roughly 20 ft × 40 ft. A single ZS38K4E scroll condensing unit feeds two three-fan KL6A181 coils for maximum capacity split across the room. Configured for R448A or R449A refrigerant, it is built for high-volume distribution, food processing, and large cold-storage facilities.
Is a 5 HP Refrigeration System the Right Size?
This package is matched to the largest standard medium temperature coolers, at and beyond about 20 ft × 40 ft holding 35°F to 38°F. At 25°F suction on R448A or R449A the KFO500E4SDA condensing unit produces 43,160 BTUH at a 95°F ambient, with a matched system rating near 43,248 BTUH at 25°F SST — the highest capacity in this single-phase line and above the largest box in the standard selection guide.
With more capacity than the 4.5 HP KFO450 behind two KL6A181 coils, this package is the choice for the biggest and busiest rooms, still holding 36,460 BTUH at a 110°F ambient. Rooms of this scale differ enough in construction and usage that a computed heat-load calculation should always drive the final selection.
Ideal for: high-volume distribution centers, food-processing plants, large central commissaries, and industrial cold storage.
Representative box sizes: this package is commonly applied to coolers such as 20 ft × 40 ft and larger footprints determined by a calculated heat load, with more capacity in hand than the 4.5 HP KFO450 package.
For a smaller room, see the Kramer 4.5 HP KFO450E4SDA 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 | KFO500E4SDA — 5 HP Medium Temperature Condensing Unit |
|---|---|
| Indoor Evaporator | Two KL6A181ADASC Low Profile Unit Coolers |
| Application | Medium Temperature Walk-In Cooler Refrigeration System |
| System Capacity | Approximately 43,248 BTUH matched system (R448A/R449A, 25°F S.T.), across two coils |
| 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 KFO500E4SDA condensing unit and the two KL6A181ADASC evaporators 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
KFO500E4SDA Outdoor Condensing Unit
- 5 HP ZS38K4E scroll compressor for medium temperature commercial refrigeration
- 43,160 BTUH at 95°F ambient and 25°F suction on R448A or R449A
- 36,460 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 28.5 rated load amps and 169 locked rotor amps, on a 41.8 amp minimum circuit ampacity with 70 amp maximum overcurrent protection
Two KL6A181ADASC Low Profile Unit Coolers
- 21,200 BTUH per coil with R448A or R449A at 25°F SST and 10°F TD (18,100 BTUH on R404A), for a combined matched system near 43,248 BTUH
- Two multi-circuit distributor-fed coils for even refrigerant distribution across the coil face
- Factory-mounted thermostatic expansion valve, selected for R448A and R449A service
- Two KL6A181ADASC coils moving a combined airflow (2,325 CFM each) through a draw-through pattern for even temperature across a large room
- 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
- Each coil UL and cUL listed with 3/8 in. liquid and 5/8 in. suction connections
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 KFO500E4SDA matched to?
The largest standard medium-temperature coolers, at and beyond about 20 ft × 40 ft holding 35°F to 38°F. Above the selection guide's largest box, a computed heat load should always be used.
How is the KFO500E4SDA different from the 4.5 HP KFO450E4SDA?
Both share the same 20 ft × 40 ft standard ceiling, but the KFO500E4SDA uses the largest compressor in the single-phase line, a ZS38K4E, with two KL6A181 coils, raising matched capacity from about 39,104 to 43,248 BTUH at 25°F SST for the largest or busiest rooms.
Is the KFO500E4SDA the largest system in this single-phase line?
Yes. At 5 HP it is the top of the single-phase medium-temperature range shown here. Larger capacity is available in three-phase configurations, such as the 6 HP KFO600E4SEA.
What electrical service does the KFO500E4SDA require?
It draws the most of any system in this line: about 28.5 rated load amps and 169 locked rotor amps on 208-230V single-phase, needing a 41.8 amp minimum circuit ampacity and 70 amp maximum overcurrent protection. Each evaporator is powered separately at 115V.
Why two KL6A181 coils rather than one larger coil?
Splitting the load across two coils places cooling at two points in a large room for even temperature, and keeps each evaporator to a manageable size for handling, mounting, and airflow. Both run from the single ZS38K4E condensing unit.
What kinds of facilities need a system this large?
High-volume distribution centers, food-processing plants, large central commissaries, and industrial cold storage.
Kramer KFO Condenser Technical SpecificationsKramer Installation GuideKramer Maintenence ManualKramer KL6 Technical SpecificationsKramer KL6 CatalogKramer Warranty
