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DD series sub-engine bus air conditioner

DD Series Sub-Engine Bus Air Conditioner

DD Series
Cooling Capacity:
Driven Type:
12-14 meter Bus

DD Series Bus Air Conditioner System Introduction

Guchen DD series bus air conditioner can equip with other vehicle engine driven bus ac units, such as working together with BD bus air conditioner, SD or PD series. When equip DD series bus air conditioner, the ac units will not rely on bus engine to generate cold air, that is to say, even the bus stops on the half way, the cold air will not stop! So DD series are also called as "independent bus air conditioner units". It is dedicated designed with multiple perfect protection functions for voltage, coil temperature, system pressure, temperature of motor and oil pressure.

DD Series Bus Air Conditioner System Features

Independent compressor drive, stable system pressure, not interfered by the main motor and with both quality of cooling and driving.
Bus air conditioner’s compressor is driven by this DD sub-engine, power input is very stable, which not affected by the vehicle engine, low noise, fuel saving, big displacement compressor, make the bus A/C have a strong cooling output
Use engine with high quality to ensure low noise, less fuel consumption and match large displacement compressor with strong cooling output.

DD Series Bus Air Conditioner Technology Data


Engine Voltage

AC Voltage

Engine Displacement

Engine Power

Cooling Range


Vehicle Mached 


Yanmar or Isuzu

DC 24V




12-14 meter Shuttle Bus

DD model is with humanisti rear starter design, rated power is 2.3 kW, rated voltage is 12V, hermetic structure, easy and fast operation and maintenance.

Guchen DD Series Independent Bus A/C Systems

Main Structure / Accessories
Main Structurer / Accessories of The Engine Include The following Parts:
main accessories of sub engine bus air conditioner
1. Radiator Fill   2. Lift Point   3. Air cleaner   4. Compressor   5. Fan of Radiator   6. Generator   7. Starter   8. Muffler   9. Generator for air conditioning

main accessories of dd sub engine bus air conditioner
1. Sigh Glass of Compressor   2. Oil Filter   3. Lift Point   4. Radiator   5. Control Box   6. Water Separator   7. Fuel Filter   8. Fuel Solenoid   9. Generator

Main Parameter of Diesel and the requirements of its accessory
◆ Suction and exhaust system

1. The diesel is equipped with muffler, the exhaust tail pipe is downward fitted, and the d = 57.2mm

2. Air cleaner is fitted in the suction pipe, d = 50mm

3. system is fitted with inlet air heater, DC 12v/400w-15S

 DD series independent bus air conditioner

◆ Suspension system

Front and rear suspension bracket is provided by user, installation dimension please refer the outline dimension


◆ Cooling system

Use suction type system plastic fan, with 8 pieces fan blades,

Water tank is provided

Water outlet of the engine is fitted upward, d = 28mm

Water pump inlet is fitted left side, (viewed from the end of the fan blade) d = 28 mm


◆ Fuel system

1. high pressure fuel pump: MP4

2. Power output control: cut off the electricity and shut up the fuel supply.

3. the engine is equipped with fuel feeding pump


◆ Lubrication system

Oil capacity of engine is about 3.4~7.4 liters, use the oil permitted by the engine,

Ambient temperature: -15°C < T < 40°C, system use 15W/40 CF-4,

In the other temperature, system use the other type of diesel lubricating oil not lower than the level of CF grade of GB11122, CD, CG, and CH grade oil are not permitted, the engine has no oil inside when leave the factory


◆ Electrical control system

Starter, rated power is 2.3 kW, rated voltage is 12V, hermetic structure

Denso adjuster, generator, 12V, 40A

No gauge on the diesel, with oil pressure switch, without water temperature sensor, and the connector of the water temperature sensor is blocked by the bolt to prevent the oil or water leaks.

Customer Installation and Reviews

Bus A/C project for Qatar old TATA buses: The clients ordered BD series bus ac units and equip with DD series independent ac units for their buses. As the local ambient temperature is very hot in summer, The combination of these two series is necessary. Our customer gave a highly commend on the superior performance of Guchen bus a/c system. The cooling capacity is enough for their local condition.
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