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WL26LY Roof-Mounted Bus Air Conditioner — Split-Unit Architecture Advantage
Architecture review AR-WL26LY | Why the LY split-roof design uses copper-tube coils and how the WL26LY serves 8–10.5 m buses with 28 kW.
- Overview
- Recommended Products
1. Split Roof vs Integral Roof — The Design Choice
The WL26LY belongs to the LY split-roof family: the condenser and evaporator sections are laid out as independent sub-assemblies inside one long roof profile, joined by the refrigerant circuit rather than by shared ducting. This gives two practical fleet advantages — modular service access (either section can be opened and repaired without stripping the other) and copper-tube coils on both sides for maximum corrosion margin in humid climates.
2. Official Technical Data
Parameter |
Value |
Cooling capacity |
28 kW (95,536 BTU) |
Applicable vehicle |
8.0 – 10.5 m bus |
Dimensions |
4110 × 1865 × 190 mm |
Weight |
≤ 210 kg |
Voltage |
DC 24V |
Evaporator airflow |
4,800 m³/h |
Condenser airflow |
7,200 m³/h |
FKX40-560K / 4PFCY — 550 / 650 cc |
|
Refrigerant |
R134a — 12.0 kg |
Condenser / evaporator fans |
4 / 6 pcs |
Condenser coil |
Fin and tube (copper) |
Evaporator coil |
Fin and tube (copper) |
Fig. 1 — Official WL26LY technical parameter table (manufacturer's catalogue data)
Fig. 2 — WL26LY long-profile split roof unit (external view)
3. Copper-Tube Coils — Both Sides
Unlike integral designs that use aluminium parallel-flow on the condenser, the LY family specifies copper-tube fin-and-tube coils on both condenser and evaporator. Copper gives higher corrosion resistance against road salt and coastal air, and — critically — the coils can be repaired locally by any refrigeration shop, whereas aluminium condensers must be replaced.
Fig. 3 — WL26LY external profile: aerodynamic shell with fan deck
4. Fan Configuration — 6 + 4
Six ZHF283502 evaporator blowers distribute 4,800 m³/h across the full cabin; four LNF273107C condenser fans provide the idle airflow a split unit needs at bus terminals. The drive train pairs an FKX40-560K / 4PFCY compressor (550/650 cc) with a 2A/2B clutch and SPB belt.
Fig. 4 — Internal section: coil blocks, blowers and sealed refrigerant circuit
5. Kit Configuration — Component BOM
Component |
Model / Brand |
Qty |
Compressor |
FKX40-560K / 4PFCY (joint venture) |
1 |
Clutch |
2A / 2B |
1 |
Belt |
SPB (Samsung Korea/Japan) |
1 set |
150 A / 28 V |
1 |
|
Evaporator blower |
ZHF283502 (joint venture) |
6 |
Condenser fan |
LNF273107C (joint venture) |
4 |
Expansion valve |
TGEN7.0T (Danfoss) |
1 |
Sight glass |
SGN12S (Danfoss Denmark) |
1 |
Drier filter |
Danfoss |
1 |
Control panel |
LM824 (Liming) |
1 |
6. Installation & Roof Opening
Fig. 5 — Manufacturer's roof-opening drawing: cut-outs and mounting points (mm)
7. Buyer FAQ
Q1. What is the advantage of the split-roof LY design?
Independent condenser/evaporator sections mean modular service access, and copper-tube coils on both sides give superior corrosion resistance plus repairability.
Q2. What buses does the WL26LY fit?
8.0–10.5 m buses and coaches needing 28 kW — a common upgrade path from 20 kW-class units.
Q3. What refrigerant does it use?
R134a with a 12.0 kg factory charge.
Q4. Is the compressor included?
Full kit with FKX40-560K/4PFCY compressor, clutch, belt and alternator; roof-only option available.
Q5. Can the coils be repaired locally?
Yes — copper-tube fin-and-tube coils can be serviced by any refrigeration workshop, unlike aluminium parallel-flow condensers.
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.
