Kramer 4 HP Medium Temperature Walk-In Cooler Refrigeration System
The Kramer KFO400E4SDA outdoor condensing unit and two KL6A141ADASC low profile unit coolers form a factory-matched 4 HP medium temperature refrigeration package for large walk-in coolers up to roughly 20 ft × 40 ft. This is the first dual-evaporator system in the line: a single ZS29KAE scroll condensing unit feeds two three-fan KL6A141 coils, splitting airflow across a big room for even temperature. Configured for R448A or R449A refrigerant, it fits large distribution centers, central commissaries, and warehouse cold rooms.
Is a 4 HP Refrigeration System the Right Size?
This package is matched to medium temperature coolers up to about 20 ft × 40 ft holding 35°F to 38°F. At 25°F suction on R448A or R449A the KFO400E4SDA condensing unit produces 35,030 BTUH at a 95°F ambient, with a matched system rating near 34,556 BTUH at 25°F SST — roughly 800 square feet of well-insulated cooler at average usage.
Using two evaporators instead of one larger coil places cooling at both ends of a long room, which evens out temperature and shortens recovery in high-traffic spaces. The system holds 31,210 BTUH at a 110°F ambient. Rooms beyond 20 ft × 40 ft, or with heavy dock-door traffic, should be confirmed with a calculated heat load.
Ideal for: large distribution centers, central commissary kitchens, food-processing cold rooms, and warehouse-scale cold storage.
Representative box sizes: this package is commonly applied to coolers such as 20 ft × 36 ft and 20 ft × 40 ft.
Need more capacity? Step up to the Kramer 4.5 HP KFO450E4SDA Refrigeration System (dual coil). For a smaller room, see the Kramer 3.5 HP KFO350E4SDA & KL6A235ADASC 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 | KFO400E4SDA — 4 HP Medium Temperature Condensing Unit |
|---|---|
| Indoor Evaporator | Two KL6A141ADASC Low Profile Unit Coolers |
| Application | Medium Temperature Walk-In Cooler Refrigeration System |
| System Capacity | Approximately 34,556 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 KFO400E4SDA condensing unit and the two KL6A141ADASC 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
KFO400E4SDA Outdoor Condensing Unit
- 4 HP ZS29KAE scroll compressor for medium temperature commercial refrigeration
- 35,030 BTUH at 95°F ambient and 25°F suction on R448A or R449A
- 31,210 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 23.4 rated load amps and 137 locked rotor amps, on a 35.5 amp minimum circuit ampacity with 50 amp maximum overcurrent protection
Two KL6A141ADASC Low Profile Unit Coolers
- 16,300 BTUH per coil with R448A or R449A at 25°F SST and 10°F TD (14,100 BTUH on R404A), for a combined matched system near 34,556 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 KL6A141ADASC coils moving a combined airflow (2,355 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 does the KFO400E4SDA cover?
Large medium-temperature coolers up to about 20 ft × 40 ft holding 35°F to 38°F. At this scale a computed heat load should drive the final selection.
Why does the KFO400E4SDA use two evaporators?
A single coil cannot move enough air to hold temperature evenly across a room this large. The KFO400E4SDA feeds two KL6A141 coils from one condensing unit so cooling is delivered at two points in the space.
Do both evaporators run from a single condensing unit?
Yes. One ZS29KAE condensing unit serves both KL6A141 coils through a shared refrigerant circuit. The two coils are piped and controlled together as one system.
What electrical service does the KFO400E4SDA require?
The condensing unit runs on 208-230V single-phase, 60 Hz, drawing about 23.4 rated load amps with a 35.5 amp minimum circuit ampacity and 50 amp maximum overcurrent protection. Each 115V evaporator is powered separately.
Is this a freezer system?
No. It is built for medium-temperature walk-in coolers using air defrost. Freezer service requires low-temperature equipment with an electric or hot-gas defrost method.
What operations commonly use a dual-coil system like this?
Large distribution centers, central commissary kitchens, food-processing cold rooms, and warehouse-scale cold storage.
Kramer KFO Condenser Technical SpecificationsKramer Installation GuideKramer Maintenence ManualKramer KL6 Technical SpecificationsKramer KL6 CatalogKramer Warranty
