The manual for this unit reveals a machine built for durability and simple operation. Its primary function is to maintain cabin comfort during ground operations, especially in extreme climates where environmental control is critical for both passengers and onboard electronics.
Turn the master electrical switch to the ON position. Wait for the digital control panel to boot up and self-diagnose.
On the control interface, select COOLING or VENTILATION mode.
This "H-CUP" model (Heating-Conditioned Utility Power) provides both cooling and heating capabilities for aircraft passenger comfort in various climates. It is widely recognized for using environmentally friendly and a corrosion-resistant galvanized steel frame. Key Specifications Cooling Capacity : 24 nominal tons of refrigeration. Heating Capacity : 234,000 BTU/hr (approx. 68.5 kW). Air Flow : Up to 190 lb/min (86 kg/min). tld acu-302-h-cup manual
Comprehensive Operation and Maintenance Manual for the TLD ACU-302-H-CUP Air Conditioning Unit
Engage the blower fan switch. Once the airflow stabilizes, engage the compressor clutch switch. The engine RPM will automatically ramp up to handling speed to accommodate the compressor load. Shutting Down the Unit
The is a powerhouse of Ground Support Equipment (GSE), functioning as a self-contained diesel-electric air conditioning and heating unit designed specifically for narrow-body aircraft, regional jets, and commuter planes worldwide . This model is particularly valued for its "H" designation, which indicates the inclusion of a high-capacity heating system alongside its standard 24-ton cooling capability. The Anatomy of a Ramp Essential The manual for this unit reveals a machine
Irradiate a set of cards to a known dose (e.g., 1 mSv) using a calibrated Cs-137 or Co-60 source. The manual provides a formula:
For maintenance technicians, the is gold. Here are the highlights every shop should bookmark:
Allow the engine to idle for 3–5 minutes to stabilize oil pressure and operating temperature. Connecting to the Aircraft Wait for the digital control panel to boot
Unlike resistive heating readers, the ACU-302-H-CUP uses a gas heating system. The manual details:
Replace fuel filters. Inspect electrical control box contacts. Check compressor oil level via the built-in crankcase sight glass.
Inside the cabin, passengers feel a sudden, refreshing breeze. They have no idea that outside, a 7,500-pound machine is working tirelessly to maintain their comfort. The manual ensures that even if a sensor detects high pressure or a loss of phase, the unit’s safety shutdowns will kick in, protecting both the machine and the multi-million dollar aircraft it’s tethered to. Quick Specs from the Manual Specification 24 Nominal Tons Heating Capacity 234,000 BTU/hr Engine Cummins Diesel (Tier 3/Stage IIIA) Refrigerant Environmentally safe R-134a Run Time Up to 16 hours on a 77-gallon tank