Changzhou Holicen New Energy Technology Ltd. supplies a series of universal evaporator units for split air conditioning systems on trucks, buses, construction machinery and RVs. Outlet layout, panel finish, control type, body size and voltage system can be combined to match the vehicle, and the series is CE certified.
What the configurations share: adjustable louver outlets, a dedicated condensate drain port, an engineering-plastic housing and universal mounting holes. Exact outlet arrangement and airflow figures are listed in the selection sheet.
Key takeaways
- A series, not a single model. Outlet layout, panel finish, control type, body size and voltage are configured per vehicle.
- Outlet count is flexible. From compact units with fewer outlets and concentrated airflow to full-width units with more outlets spread across the face.
- Two control types. Rotary knob for simple, repairable operation; electronic control for precise temperature setting.
- Twin-blower versions run two centrifugal blowers in parallel for higher airflow and longer throw.
- Adjustable louvers, dedicated drain port, plastic housing — controllable airflow direction, no condensate seepage, no corrosion.
- CE certified, meeting the compliance requirement for the European market.
What the unit does in a split system
A vehicle air conditioning circuit has four stages: the compressor raises refrigerant pressure, the condenser rejects heat, the expansion device drops the pressure, and the evaporator absorbs heat from the cabin. The evaporator unit handles the last stage — refrigerant evaporates inside the core, and blowers push the cooled air into the cabin.
Splitting the system frees up the installation position. The compressor and condenser sit under the floor or outside the body, while the evaporator unit hangs from the roof or a side panel without touching the dashboard — a practical layout for construction machinery and converted vehicles.
Configurations: airflow pattern, panel and control
Cabin size drives the choice. A narrow cab needs one concentrated stream of cold air; a wide cabin needs coverage spread across the seats.
| Configuration | Structure | Typical use |
| Concentrated airflow | Fewer outlets, side outlets plus a center outlet, shorter body | Narrow truck cabs, construction machinery |
| Full-width airflow | More outlets arranged across the full face, longer and flatter body | Wide cabs, bus cabins, RVs |
Panels come in two finishes: standard engineering plastic for durability and lower cost, or wood-grain for buses, RVs and premium conversions where the interior needs a consistent look. Housing structure and mounting are identical.
More outlets need more pressure
Adding outlets widens coverage, but each outlet receives a smaller share of the total airflow. In a large cabin with long duct runs, the last outlet is where airflow drops off first — the familiar "air comes out, but barely reaches" problem.
That is why multi-outlet configurations are typically paired with twin blowers. Two centrifugal blowers in one housing combine the output of two impellers, raising outlet velocity and throw so cold air reaches the sleeper or rear rows instead of fading near the vent.
Centrifugal impellers are larger in diameter and generate higher static pressure than axial fans, which makes them suited to ducted delivery. When selecting, match the airflow figures to cabin volume rather than counting outlets alone.
Control options
Rotary knob. Separate knobs control fan speed and temperature (marked HI and COOL on the panel), driving the damper and blower steps mechanically. Under sustained sun exposure, dust and vibration, solder joints, wiring and membrane keys on an electronic panel are usually the first parts to fail. A mechanical control has fewer failure points, and a worn knob is a cheap replacement.
Electronic control. Finer temperature setting and a more direct interface, suited to passenger transport, RVs and premium conversions where the temperature is held steady and adjusted often.
The choice follows the duty cycle: mining, construction and long-haul fleets — where downtime costs more than parts — favour the rotary knob; projects that prioritise precise temperature control favour the electronic version.
Drainage and housing
Condensate needs a way out. The evaporator core runs below the dew point of the cabin air, so condensation is unavoidable. If it cannot drain, water seeps through the headliner, causes mould and odour, and eventually corrodes body panels. Every unit has a dedicated drain port at the base that can be piped outside the cabin.
Plastic housing. Compared with metal, engineering plastic does not rust, resists salt spray in coastal and humid regions, and keeps roof load down — a real consideration for overhead mounting.
Fitment
| Vehicle / equipment | Mounting position | Typical configuration |
| Heavy trucks, tractor units | Cab and sleeper | Concentrated or full-width |
| Buses, minibuses | Cabin | Full-width, wood-grain panel |
| Excavators, wheel loaders | Cab | Concentrated |
| Tractors, agricultural machinery | Cab | Concentrated |
| RVs, converted vehicles | Cabin | Full-width, wood-grain panel |
All units use universal mounting holes, so aftermarket retrofits need no custom bracket and workshops can complete the install quickly.
Five points to confirm before ordering
| Item | Why it matters |
| Voltage system (12V / 24V) | Must match the vehicle electrical system and compressor; never mix |
| Body size and mounting space | Concentrated and full-width bodies differ in length; leave room in the headliner |
| Outlet layout | Match outlet coverage to cab width and seating |
| Control type | Rotary knob or electronic, based on operating habits and service conditions |
| Cooling capacity matching | Evaporator, compressor and condenser must be matched as a set |
Configuration in one line
Multiple configurations (varied outlet layouts, plastic or wood-grain panel, rotary knob or electronic control) + adjustable louvers + optional twin-blower structure + dedicated condensate drain + engineering-plastic housing + CE certified + universal mounting holes.
FAQ
Is this a single model or a series? A series. Outlet layout, panel finish, control type, body size and voltage are combined per vehicle. A full configuration list and specifications are available on request.
Is more outlets always better? No. More outlets widen coverage, but each outlet receives less airflow. The deciding factor is whether airflow figures match cabin volume — a wide cabin suits a full-width unit, a narrow cab is better served by concentrated airflow.
Rotary knob or electronic control? Both are available. The rotary knob has fewer failure points and is easier to repair; the electronic version offers finer temperature setting. Choose by duty cycle and service conditions.
Is the unit CE certified? Yes. The series is CE certified for European market compliance.
What is the difference between the plastic and wood-grain panel? Finish only. Housing structure, blowers and heat exchanger core are the same. Wood-grain suits buses, RVs and conversions that need a consistent interior; the standard panel favours durability and cost.
Can I replace only the evaporator unit and keep the original compressor and condenser? Yes, provided cooling capacity, refrigerant type and port sizes match. Have the workshop verify the original system parameters first to avoid under-cooling or liquid return.
Does a twin-blower unit draw more power? The blowers draw more than a single-blower version, but higher airflow brings the cabin to temperature faster and shortens compressor run time at full load. Overall consumption depends on system matching and duty cycle.
What happens if condensate cannot drain? Water collects in the housing or seeps through the headliner, causing mould, odour and corrosion of panels and electrical connectors. Confirm the drain hose runs freely and ends below the unit.
About Holicen — Changzhou Holicen New Energy Technology Ltd.
Changzhou Holicen New Energy Technology Ltd. (brand Holicen, hlskaac.com) manufactures vehicle thermal management products: parking air conditioners (rooftop and split), diesel air heaters, automotive air conditioning compressors, vehicle refrigerators and transport refrigeration equipment. The company serves fleet operators, OEM upfitters and parts distributors across Latin America, the Middle East, Russia and North America.
Store: https://czholicen.en.made-in-china.com/
https://czhollysen.en.alibaba.com/
Email: holicen@hlskaac.com
Post time: Oct-23-2026