Kramer 4 HP Low Temperature Refrigeration Condensing Unit
The Kramer KFO400L4SEB is a 4 HP outdoor condensing unit built for low-temperature walk-in freezer refrigeration. A ZF13K4E low-temperature scroll compressor delivers approximately 12,990 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. This is the condensing unit only; it pairs with a matched Kramer low-profile electric-defrost evaporator for a complete large freezer system.
Is a 4 HP Low-Temp Condensing Unit the Right Size?
At 95°F ambient and -20°F SST the KFO400L4SEB produces about 12,990 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 KFO400L4SEB is factory-matched to the KL6E105DDASC 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 frozen-storage and distribution freezers, food-processing plants, and central commissaries.
Need more capacity? Step up to the Kramer 5 HP KFO500L4SEB Low-Temp Condensing Unit. For a smaller freezer, see the Kramer 3.5 HP KFO350L4SEA 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 | KFO400L4SEB |
|---|---|
| Horsepower | 4 HP |
| Compressor | ZF13K4E Low-Temperature Scroll Compressor |
| Application | Low Temperature Walk-In Freezer Refrigeration |
| Refrigerant | R448A or R449A |
| Capacity | Approximately 12,990 BTUH at 95°F ambient and -20°F SST |
| Electrical | 208-230V, Three Phase, 60 Hz |
| Minimum Circuit Ampacity | 21.1 A |
| Maximum Overcurrent Protection | 30 A |
| Matched Evaporator | KL6E105DDASC Low Profile Unit Cooler (sold separately) |
| Factory Charge | Nitrogen Holding Charge — Refrigerant Field Supplied |
| Manufacturer Warranty | 1 Year |
Condensing Unit Features
- 4 HP ZF13K4E low-temperature scroll compressor rated for walk-in freezer duty
- Approximately 12,990 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 11.9 rated load amps and 99 locked rotor amps, on a 21.1 amp minimum circuit ampacity and 30 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 KFO400L4SEB built for?
It is a 4 HP low-temperature condensing unit for large frozen-storage and distribution freezers, rated about 12,990 BTUH at 95°F ambient and -20°F SST on R448A or R449A.
Which evaporator is matched to the KFO400L4SEB?
Kramer matches it with the KL6E105DDASC low-profile electric-defrost unit cooler, sold separately to complete the freezer system.
What electrical service does the KFO400L4SEB require?
A dedicated 208-230V three-phase, 60 Hz circuit sized for about 11.9 rated load amps, with a 21.1 amp minimum circuit ampacity and 30 amp maximum overcurrent protection.
Why is a timed electric defrost required on the matched coil?
At these box temperatures the evaporator frosts heavily, so the matched KL6E105DDASC uses electric defrost heaters on a timed cycle; the KFO400L4SEB provides the defrost termination connections for it.
Does the KFO400L4SEB include defrost and pressure controls?
Yes. It includes fixed high-pressure and adjustable low-pressure controls plus provisions for the matched electric-defrost evaporator's defrost termination.
Is the unit factory-charged with refrigerant?
No. It ships under a nitrogen holding charge; R-448A or R-449A is added in the field during charging and commissioning by an EPA 608 certified technician.
Kramer KFO Condenser Technical SpecificationsKramer Installation GuideKramer Maintenence ManualKramer Warranty
