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WL14DB Electric Bus Air Conditioner — High-Voltage Cooling & Heating System
EV system file EV-WL14DB | Purpose-built for battery-electric buses: high-voltage compressor drive, heat-pump heating and low auxiliary power consumption.
- Overview
- Recommended Products
1. Built for the Electric Bus Platform
An electric bus runs its AC directly from the high-voltage traction battery (DC 250–750 V) — there is no engine belt and no engine-driven compressor. The WL14DB is purpose-built for this: an electric compressor (LM-50) driven through a DC/DC converter, delivering 16 kW cooling and 12 kW heating for 6.0–7.0 m electric buses at a total power draw of just 4.6 kW.
2. Official Technical Data
Parameter |
Value |
Cooling capacity |
16 kW |
Heating capacity |
12 kW (heat-pump / PTC hybrid) |
Applicable vehicle |
6.0 – 7.0 m electric bus |
Input voltage |
DC 250 – 750 V |
Power consumption |
4.6 kW total |
Evaporator airflow |
3,200 m³/h |
Condenser airflow |
4,800 m³/h |
Electric (LM-50) |
|
Refrigerant |
R407c |
Dimensions |
2325 × 1560 × 265 mm |
Weight |
≤ 155 kg |
Control software |
Airjoy embedded programmable system |
Fig. 1 — Official WL14DB technical parameter table (manufacturer's catalogue data)
Fig. 2 — Internal layout: electric compressor, coils, fans and high-voltage control system
3. High-Voltage System Architecture
Component |
Configuration |
Electric compressor |
LM-50 (OEM) |
DC/DC converter |
250–720 V / 2 kW |
Vapor-liquid separator |
WQYZ-3 (Airjoy) |
Expansion valve |
Electronic TS-6 (Danfoss / Honeywell) |
Four-way valve |
Reversing for heat mode |
Condenser fans |
24V brushless × 2 |
Evaporator blowers |
24V / 293 L × 4 |
Control panel |
LM824D (Airjoy) |
Fig. 3 — Unit in export transport frame (external view)
4. Efficiency Logic
With only 4.6 kW drawn from the traction battery, the WL14DB adds roughly 1–2% to the bus's auxiliary energy consumption at full cooling — versus 8–12% for older fixed-displacement belt-driven designs. The electronic expansion valve (TS-6) modulates refrigerant feed continuously instead of cycling, holding capacity with less energy.
5. Installation & Roof Opening
Fig. 4 — Manufacturer's roof-opening drawing with service hatch (mm)
6. Buyer FAQ
Q1. Which buses does the WL14DB fit?
6.0–7.0 m battery-electric buses and minibuses with DC 250–750 V traction systems.
Q2. Does it provide heating?
Yes — heat-pump heating at 12 kW with reversing four-way valve, plus PTC option for extreme cold.
Q3. What voltage does it accept?
DC 250–750 V input through the DC/DC converter; the control system runs on 24V auxiliary.
Q4. What refrigerant does it use?
R407c.
Q5. How efficient is it?
4.6 kW total power draw at full cooling — typically 1–2% of traction battery consumption on a 6–7 m bus.
Contact Our Export Team
Hunan Weili Auto Parts Appliance Co., Ltd. — founded in 2007, ISO 9001 & IATF 16949 certified manufacturer of bus & truck AC parts, electric fans, blowers, lighting and alternator components.
WhatsApp / WeChat: +86-18670382782 | Landline: +86-0731-82034997 / 82034998
E-Mail: [email protected] | Websites: www.weilipart.com | www.weiliautomotive.com | www.cooliparts.com
Send us your OEM part number, vehicle model or drawing — we will reply within 24 hours with a quotation and technical data sheet.
