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WL18F1 Roof-Mounted Bus Air Conditioner — Power Train Matching
Power train file PT-WL18F1 | Compressor, clutch, belt and alternator: how the WL18F1 drive line is matched to deliver 20 kW without overloading the bus engine.
- Overview
- Recommended Products
1. The Power Train Question
On a 7.3–8.2 m bus, the AC drive line competes with the vehicle's own electrical and mechanical load. The WL18F1 is engineered around a JS38 / FKX40-560K compressor (380–400 cc) — sized so cooling demand is met without excessive clutch cycling and without starving the alternator.
2. Official Technical Data
Parameter |
Value |
Cooling capacity |
20 kW (68,240 BTU) |
Applicable vehicle |
7.3 – 8.2 m bus |
Dimensions |
2350 × 1620 × 220 mm |
Weight |
≤ 110 kg |
Voltage |
DC 12V / 24V |
Evaporator airflow |
3,200 m³/h |
Condenser airflow |
7,200 m³/h |
JS38 / FKX40-560K — 380 / 400 cc |
|
Refrigerant |
R134a — 2.8 kg |
Condenser / evaporator fans |
3 / 4 pcs |
Condenser coil |
Parallel flow (aluminium) |
Evaporator coil |
Fin and tube (copper) |
Fig. 1 — Official WL18F1 technical parameter table (manufacturer's catalogue data)
3. Drive Line Components
Component |
Configuration |
Role |
Compressor |
JS38 / FKX40-560K, 380–400 cc |
Peak capacity 20 kW |
Clutch |
Matched electromagnetic |
Clean on-off, no slip |
Belt |
SPB profile |
Positive drive, long life |
Alternator (optional) |
120 A / 28 V |
Sustains 24V electrical system |
Control system |
12V / 24V (Liming) |
Fault-safe switching |
Fig. 2 — WL18F1 complete unit (external view): twin-zone roof profile with fan deck
Fig. 3 — Unit exterior detail: fan grilles and side intake
4. Why 380–400 cc Is the Right Displacement
At 20 kW peak, a smaller compressor would run continuously at maximum duty and still lag on pull-down; a larger one would short-cycle at cruise load. The 380/400 cc band keeps duty cycle inside the efficient zone across the full operating envelope — highway, city and idle.
Fig. 4 — Condenser-side piping, receiver and drive components on the assembly line
5. Kit Configuration — Component BOM
Component |
Model / Brand |
Qty |
Compressor |
JS38 / FKX40-560K (joint venture) |
1 |
Evaporator blower |
ZHF283502 (joint venture) |
4 |
Condenser fan |
LNF273107C (joint venture) |
3 |
Expansion valve |
TGEN4.5T (Danfoss) |
1 |
Sight glass |
SGN12S (Danfoss Denmark) |
1 |
Drier filter |
LM8109001-18F1-00 |
1 |
Pressure valve |
High / low (China) |
2 |
Receiver |
LM18F1 (Liming) |
1 |
Control panel |
LM824 (Liming) |
1 |
Relay |
HKE (joint venture) |
1 set |
Hoses |
Copper tube + hoses per bus |
1 set |
6. Installation & Roof Opening
Fig. 5 — Roof-cutting drawing (16/18 F1 platform): cut-outs and mounting pattern (mm)
7. Buyer FAQ
Q1. What is the peak capacity of the WL18F1?
20 kW (68,240 BTU) with the JS38/FKX40-560K compressor — the top of the 16/18 F1 family.
Q2. Does it share the roof platform with WL16F1?
Yes — identical 2350 × 1620 × 220 mm footprint and roof-cutting drawing; only the drive line and charge differ.
Q3. Is the alternator included?
It is an option (120 A / 28 V) — specify if your bus needs upgraded charging support.
Q4. What refrigerant does it use?
R134a with 2.8 kg factory charge.
Q5. Can I retrofit from WL16F1 to WL18F1?
On compatible buses, upgrading the compressor, expansion valve and charge converts the unit — contact us with your bus model.
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.
