involves a standard set of steps to ensure safety and efficient cooling or heating of the aircraft cabin.
: Features a Cummins QSB 4.5 (Tier 3) or QSF 3.8 (Tier 4) engine. Refrigerant : Uses environmentally safe R-134a . Key Operational Features
Whether you are troubleshooting a jammed carousel or performing an annual sensitivity check, always keep a copy of the TLD ACU-302-H-CUP manual within arm’s reach of the reader. In the world of radiation protection, ignorance is not bliss—it is a liability.
For full technical guidance, troubleshooting, and part lists, refer to official TLD manuals: tld acu-302-h-cup manual
Keep a close eye on the high-limit temperature sensors to ensure the air does not exceed safe thresholds for aircraft interior plastics and electronics. 4. Maintenance Schedules and Lubrication
The use of commercially available parts is a major benefit of the ACU-302 design. This means many components, particularly for the Cummins engine, can be sourced through heavy-duty truck or industrial engine parts distributors. However, TLD-specific parts (such as control panels, hinges, sensors, and the temp ramp down kit) are best obtained through the TLD parts and support network.
Routine preventative maintenance is the single most effective way to eliminate unscheduled downtime. The TLD ACU-302-H-CUP manual breaks down maintenance intervals by operating hours. Daily / Every 10 Hours Check engine oil and coolant. Drain the water separator on the fuel filter. Clean air intake screens. Weekly / Every 50 Hours Inspect compressor drive belts for tension and wear. involves a standard set of steps to ensure
: Includes refrigerant high-low pressure shutdown, blower loss of pressure interlock, and compressor temperature protection.
manual isn't just a book of instructions—it's the survival guide for a 24-ton powerhouse designed to keep aircraft cabins from becoming ovens or iceboxes. The Legend of the "H-CUP"
For maintenance technicians, the is gold. Here are the highlights every shop should bookmark: Key Operational Features Whether you are troubleshooting a
| Specification | ACU-302-H-CUP | Notes | | :--- | :--- | :--- | | | Cummins | | | Engine Model | QSB 4.5 or QSF 3.8 | Varies by emission standard | | Generator Output | 60 kW | | | Cooling Capacity | 84 kW (24 tons) | | | Air Flow | Up to 86 kg/min (190 lb/min) | | | Supplied Air Temp | 2-10°C (35-50°F) | @100°F & 50% RH | | Heating Capacity | 68.5 kW (234,000 BTU/hr) | | | Heating Ambient | Below -18°C (Below 0°F) | | | Heating Air Temp | 38-44°C (100-120°F) | | | Length | 4,715 mm (186") | | | Width | 2,096 mm (82.5") | | | Height | 1,804 mm (71") | | | Weight | 3,438 kg (7,580 lbs) | | | Fuel Tank Capacity | 291.5 liters (77 gallons) | | | Engine Oil Capacity | 15 liters | | | Coolant Capacity | 21 liters | |
: Delivery speeds up to 190 lb/min (86 kg/min). Refrigerant Type : Environmentally safe R-134a gas.