Thermo King SB-230 Trailer Refrigeration Unit

The Thermo King SB-230 belongs to the SR-3 generation of the SB series. Where earlier SB units were mechanically excellent but blind, the SB-230 was built to be monitored — every unit in the series can be upgraded to integrated wireless communications, and the controller is designed around remote setpoint management rather than a driver with a manual. Listed at $5,000. Thermo King SB-230 Specifications Type: single-temperature nose-mount trailer refrigeration unit Controller: SR-3 with OptiSet Plus load profiles Service interface: exterior-mounted HMI with USB port — no doors or panels to remove Telematics: upgradeable to Thermo King TracKing or third-party systems Engine: Thermo King four cylinder direct injection diesel Refrigerant: R-404A Condition: inspected used units, engine hours confirmed Price: $5,000 OptiSet Plus and the SR-3 OptiSet Plus lets a fleet lock a commodity to a setpoint profile rather than a number. Instead of trusting a driver to remember that ice cream runs at -20°F with continuous fans and bananas run at 58°F on cycle-sentry, the profile is loaded into the controller and the driver selects the commodity. The single largest cause of rejected reefer loads is a setpoint entered wrong, and this is the feature that removes it. The SR-3 also moved diagnostics outside. The HMI sits on the exterior of the unit with a USB port beside it, so a technician downloads data, uploads a profile or flash-loads new software standing on the ground with the doors shut. Buying Used Thermo King’s own certified pre-owned standard for trailer units is under 23,000 engine hours, and that is a fair line to hold. Ask us for the hour meter reading, a cooling/heating/defrost cycle test and serial-plate photographs before you commit. Genuine Thermo King parts are worth the premium on this platform — the aftermarket belt and bearing failures we see on trade-ins are almost always imitation parts. Applications Grocery and foodservice distribution, frozen and multi-drop chilled work, pharmaceutical freight where temperature data logging is contractually required, and any fleet standardising on telematics-capable reefers. Compare with the SB-210+ if you need electric standby, or the Precedent S-600 for a Tier 4 final, CARB-compliant platform. Freight Ships on a flatbed, forklift required at delivery. Freight is quoted to your ZIP code — send us the delivery address for a price.