Kramer 3 HP Low Temperature Walk-In Freezer Refrigeration System
The Kramer KFO300L4SDA outdoor condensing unit and KL6E077DDASC low profile unit cooler form a factory-matched 3 HP low-temperature refrigeration package for walk-in freezers up to roughly 10 ft × 12 ft. A ZF09K4E low-temperature scroll compressor is paired with a two-fan electric-defrost evaporator, delivering about 9,000 BTUH at 95°F ambient and a -20°F saturated suction to hold a freezer near a -10°F box temperature on R448A or R449A refrigerant. It suits large walk-in freezers in supermarkets, commissary kitchens, and frozen-food operations.
Is a 3 HP Low-Temp Freezer System the Right Size?
This package is matched to walk-in freezers up to about 10 ft × 12 ft holding a -10°F box. Its rated system capacity is near 8,976 BTUH at a -20°F saturated suction temperature. Because a freezer at -10°F carries a much higher heat load than a cooler of the same footprint, a freezer system covers a smaller box than a cooler of similar horsepower — size from a calculated freezer load rather than floor area.
Freezer load is driven by insulation R-value, outdoor ambient, door-opening frequency, the quantity and entering temperature of product frozen or stored each day, defrost frequency, and required pull-down time. Heavy door traffic or large daily product loading raises the requirement, so high-use freezers should size down a step. The matched KL6E077DDASC evaporator uses timed electric defrost, which is required below freezing because off-cycle air cannot clear coil frost.
Ideal for: large walk-in freezers in supermarkets, commissary kitchens, and frozen-food operations.
Need more capacity? Step up to the Kramer 3.5 HP KFO350L4SDA Walk-In Freezer System. For a smaller freezer, see the Kramer 2.5 HP KFO250L4SDA Walk-In Freezer System.
Recommended refrigeration applications are general guidelines only. Actual system requirements depend on insulation, ambient conditions, door openings, product load, defrost, and operating temperature. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Condensing Unit | KFO300L4SDA — 3 HP Low Temperature Condensing Unit |
|---|---|
| Indoor Evaporator | KL6E077DDASC Low Profile Electric-Defrost Unit Cooler |
| Application | Low Temperature Walk-In Freezer Refrigeration System |
| System Capacity | Approximately 8,976 BTUH (R448A/R449A, -20°F SST) |
| Refrigerant | R448A or R449A |
| Compressor | High-Efficiency Low-Temperature Scroll Compressor |
| Evaporator Defrost | Electric Defrost (2,250 W) |
| Electrical | 208-230V, Single Phase, 60 Hz Condensing Unit |
| Evaporator Electrical | 208-230V |
| Factory Charge | Nitrogen Holding Charge — Refrigerant Field Supplied |
| Manufacturer Warranty | 1 Year |
The KFO300L4SDA condensing unit and the KL6E077DDASC evaporator are also stocked individually for replacement work. Ordering them together as this matched package keeps the condensing unit and coil capacities aligned at freezer design conditions. Both 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
KFO300L4SDA Outdoor Condensing Unit
- 3 HP ZF09K4E low-temperature scroll compressor rated for walk-in freezer duty
- Approximately 9,000 BTUH at 95°F ambient and -20°F saturated suction on R448A or R449A
- Integral liquid sub-cooling circuit 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 defrost termination provisions for the matched electric-defrost evaporator
- 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 12.8 rated load amps and 88 locked rotor amps, on a 18 amp minimum circuit ampacity with 30 amp maximum overcurrent protection
KL6E077DDASC Low Profile Unit Cooler
- 8,800 BTUH with R448A or R449A at -20°F SST and 10°F TD, and 7,700 BTUH on R404A
- Two electronically commutated (EC) fan motors moving 1,570 CFM through a draw-through air pattern
- Timed electric defrost with approximately 2,250 watts of heaters (about 9.8 amps at 230V), required for low-temperature freezer service
- 6 fins-per-inch coil using enhanced copper tubes mechanically expanded into corrugated aluminum fins with die-formed collars
- Multi-circuit coil fed by a refrigerant distributor with a factory-mounted thermostatic expansion valve selected for R448A and R449A service
- Embossed aluminum casing with baffled fan sections, NSF compliant and designed to mount flush to the freezer ceiling
- Removable drain fitting at the bottom of the pan; a heated drain line is recommended in freezer service to prevent refreeze
- 208-230V EC fan motors with a separate 230V electric-defrost heater circuit, 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 freezer is the KFO300L4SDA system designed for?
It is matched to walk-in freezers up to about 10 ft × 12 ft holding a -10°F box, with a rated system capacity near 8,976 BTUH at -20°F SST. Confirm against a calculated freezer load, since a freezer carries a much higher heat load than a cooler of the same size.
How is the KFO300L4SDA different from the next size up?
The 3.5 HP KFO350L4SDA steps up to more capacity and a larger box; if your calculated load is near the top of this system's range, the next size is the safer choice.
What evaporator comes with the KFO300L4SDA system?
The KL6E077DDASC low-profile electric-defrost unit cooler, a two-fan coil moving 1,570 CFM, factory-matched to this condensing unit's capacity at freezer conditions.
What electrical service does the KFO300L4SDA require?
A dedicated 208-230V single-phase, 60 Hz circuit for the condensing unit, drawing about 12.8 rated load amps with a 18 amp minimum circuit ampacity and 30 amp maximum overcurrent protection. The evaporator, including its electric defrost, is a separate 208-230V connection.
What refrigerant does the KFO300L4SDA system use?
It is configured for R448A and R449A, the current-generation lower-GWP replacements for R404A in commercial low-temperature refrigeration.
Does the KFO300L4SDA system ship with refrigerant?
No. Both the condensing unit and the evaporator ship under a nitrogen holding charge; R-448A or R-449A is field supplied and the system is charged and commissioned by an EPA 608 certified technician.
Kramer KFO Condenser Technical SpecificationsKramer Installation GuideKramer Maintenence ManualKramer KL6 Technical SpecificationsKramer KL6 CatalogKramer Warranty
