Kramer 3 HP Low Temperature Refrigeration Condensing Unit
The Kramer KFO300L4SEA is a 3 HP outdoor condensing unit built for low-temperature walk-in freezer refrigeration. A ZF09K4E low-temperature scroll compressor delivers approximately 9,000 BTUH at a 95°F ambient and a -20°F saturated suction temperature on R448A or R449A refrigerant, holding a walk-in freezer near a -10°F box temperature. Sold as the condensing unit only, it forms a complete system when matched with a Kramer low-profile electric-defrost evaporator.
Is a 3 HP Low-Temp Condensing Unit the Right Size?
At 95°F ambient and -20°F SST the KFO300L4SEA produces about 9,000 BTUH on R448A or R449A, matched to a walk-in freezer holding roughly -10°F. 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, and required pull-down time, so size from a calculated load rather than floor area alone.
This listing is for the outdoor condensing unit only. To build a complete walk-in freezer system, it pairs with a matched Kramer low-profile unit cooler with electric defrost — the KFO300L4SEA is factory-matched to the KL6E077DDASC evaporator. Low-temperature evaporators use electric defrost rather than air defrost, because a freezer coil accumulates frost that off-cycle box air cannot clear.
Ideal for: large walk-in freezers in supermarkets, commissary kitchens, frozen-food distribution, and commercial cold storage.
Need more capacity? Step up to the Kramer 3.5 HP KFO350L4SEA Low-Temp Condensing Unit. For a smaller freezer, see the Kramer 2.5 HP KFO250L4SEA Low-Temp Condensing Unit.
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.
Condensing Unit Specifications
| Condensing Unit Model | KFO300L4SEA |
|---|---|
| Horsepower | 3 HP |
| Compressor | ZF09K4E Low-Temperature Scroll Compressor |
| Application | Low Temperature Walk-In Freezer Refrigeration |
| Refrigerant | R448A or R449A |
| Capacity | Approximately 9,000 BTUH at 95°F ambient and -20°F SST |
| Electrical | 208-230V, Three Phase, 60 Hz |
| Minimum Circuit Ampacity | 15 A |
| Maximum Overcurrent Protection | 20 A |
| Matched Evaporator | KL6E077DDASC Low Profile Unit Cooler (sold separately) |
| Factory Charge | Nitrogen Holding Charge — Refrigerant Field Supplied |
| Manufacturer Warranty | 1 Year |
Condensing Unit Features
- 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
- Configured for R448A and R449A, the current-generation replacements for R404A in low-temperature refrigeration
- 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 a 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 three phase, drawing about 8.7 rated load amps and 83 locked rotor amps, on a 15 amp minimum circuit ampacity and 20 amp maximum overcurrent protection
Specifications & Manuals
Product documentation includes technical specifications, installation information, maintenance instructions, and warranty information to assist with equipment selection, installation, and service. This condensing unit carries a 1 year manufacturer warranty; see the Kramer warranty documentation above for full coverage terms and conditions.
Frequently Asked Questions
What is the KFO300L4SEA designed to do?
It is a 3 HP low-temperature condensing unit for large walk-in freezers, rated about 9,000 BTUH at 95°F ambient and -20°F SST on R448A or R449A for a box near -10°F.
Which evaporator does the KFO300L4SEA match with?
Kramer factory-matches it with the KL6E077DDASC low-profile electric-defrost unit cooler, sold separately to complete the walk-in freezer system.
What compressor does the KFO300L4SEA use?
A ZF09K4E Copeland low-temperature scroll compressor, built for the deep suction temperatures of freezer duty.
What circuit does the KFO300L4SEA need?
A dedicated 208-230V three-phase, 60 Hz circuit sized for about 8.7 rated load amps, with an 15 amp minimum circuit ampacity and 20 amp maximum overcurrent protection.
Will any low-profile coil work, or only the matched evaporator?
For rated performance use the matched KL6E077DDASC coil, which is selected to balance the condensing unit's capacity at freezer conditions. Contact Budget Heating before substituting a different evaporator.
Is the KFO300L4SEA charged at the factory?
No. It ships under a nitrogen holding charge; R-448A or R-449A is added during field charging and commissioning by an EPA 608 certified technician.
Kramer KFO Condenser Technical SpecificationsKramer Installation GuideKramer Maintenence ManualKramer Warranty
