Electric Air Conditioner For Electric Bus And Coach, Single Air Return

Innovative and compact
Full Electric Air Conditioner for Electric Bus, and Coach LMD Series, single Air Return Area, for 8-12m E-bus




LMD series new energy bus air conditioning is a kind of roof mounted air conditioner, with single air return area, and with different models to apply for the electric buses from 8m to 12m. The LMD series supports with various optional technology, like the Cloud control technology, the high-voltage connection anti-loosening technology, the roof unit integrated battery thermal management system(BTMS) technology, the vehicle thermal management technology, the DC750 high voltage technology, the Condensation water reduction technology, the air purifier technology inside the bus and the energy-saving aluminum alloy compressor.
Please contact with us at [email protected] for more details.

SONGZ Intelligent Electric Modular Architecture (SIEMA) Structure

Intelligent modular platform design (SONGZ SIEMA1 platform), which realizes modular design and combination of compressor, electrical control, condenser and evaporator, integrated thermal management system and etc. The product design is efficient and reliable, and the generalization rate of platform product spare parts can reach 72% .


1. Condenser and evaporator shell moduar.

2. Condenser room modular.

3. Evaporator room modular.

4. Electric control room modular.

5. Compressor room modular.

6. Battery thermal management system room modular.

Technical Specification of Electric Bus A/C LMD Series:






Cooling Capacity


16 kW

18 kW 

20 kW 

22 kW 

(Evaporator Room 40°C/ 45%RH / Condenser Room 30°C)

Recommended Bus Length(Applicable to China's climate )

8.0 ~8.8 m

8.9 ~9.4 m

9.5 ~10.4 m

10.5 ~12 m

Air Flow Volume(Zero Pressure)

Condenser(Fan Quantity)

6000 m3/h (3)

8000 m3/h (4)

8000 m3/h (4)

10000 m3/h (5)

Evaporator(Blower Quantity)

3600 m3 /h (4)

3600 m3 /h (4)

5400 m3 /h (6)

6000 m3 /h (6)

Roof Unit


2500×1900×300  (mm)

3105×1900×250  (mm)

3105×1900×250  (mm)

3105×1900×250  (mm)

Power Consumption



8.7 kW

9.6 kW

Technical Note:

1. The input power voltage of the air conditioner can adapt to DC320-DC820V, and it can be as low as to DC260V after starting, and the control voltage is DC24V (DC20-DC28.8). The technical status of the trolleybus air conditioner needs to be specifically confirmed with SONGZ, because the control method of this type of air conditioner is different, and the rated voltage of the trolleybus in foreign countries is different.

2. The refrigerant is R407C.

3. The fan is DC motor.

4. Integrated battery thermal management options:

4.1. The charging outlet water temperature is 7℃-15℃, the discharging outlet water temperature is 11℃-20℃, charging ≤10Kw, discharging ≤1-3Kw, the compressor needs to use Panasonic compressor;

4.2. The charging outlet water temperature is 7℃-15℃, the discharging outlet water temperature is 11℃-20℃, charging ≤10Kw, discharging ≤1-5Kw, the compressor needs to use Hitachi compressor;

4.3. The outlet water temperature of charging is 7℃-15℃, the outlet water temperature of discharging is 11℃-20℃, charging ≤10Kw, discharging ≤3-6Kw, Emerson compressor should be selected.

The LMD Series E-Bus AC Functions Upgrade (Optional)

In addition to the basic functions of refrigeration, heat pump heating and ventilation, the product can also upgrade the following functions according to customer and environmental requirements:

1. The ultra-low temperature heat pump heating function realizes -15 ℃ to meet the heat load of the whole vehicle, and -25 ℃ continuous heat pump operation.

2. Low-temperature heat pump heating function, to achieve high-efficiency heating in -3 ℃ low temperature environment.

3. Innovative development of two-stage compression engineering prototype, which can achieve stable operation at -35℃.


4. Develop new functions for hybrid bus, which can realize the heating function of the air conditioner for the bus, and provide the cooling function for the vehicle battery pack, protect the battery safety, and extend the battery life.

5. Integrated battery thermal management function, outputting 3-10kw battery cooling capacity according to customer requirements without affecting the cooling effect of the vehicle.

6. Air purification function, including four functions: electrostatic dust collection, ultraviolet light, strong ion generator, and photo catalyst filtration, to achieve sterilization, odor removal and efficient dust removal, and effectively block the transmission of viruses.


7. "Cloud control" function, realize remote control and diagnosis, and improve product service and monitoring capabilities through big data application.



8. PTC electric heating, according to different configurations and ambient temperature, start PTC in time, assist heating, and realize heating in the full temperature range.

LMD Series E-Bus A/C Technology Highlights:

1. Adopt streamline design, beautiful appearance.

2. The whole system adopts lightweight design, condenser without bottom shell structure design, lightweight fan design, which make the realization of the air conditioning system in low weight.

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3. The product EMC meets the requirements of GB/T 18655 level 3, the system adopts independent intellectual property rights insulation design, safe and reliable, and can also pass the EU standards.

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4. Safe and reliable, three-level insulation and fire protection design, high voltage anti-reverse connection function.

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5. Adapt frequency conversion technology, high-end products are equipped with electronic expansion valve, with precise control, energy saving and comfortable.

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6. Adopt the CFD simulation technology into the design.