Midea VC Max DOAS Dedicated Fresh Air System with Full Energy Recovery
The air that makes people feel awake, alert, and comfortable delivered efficiently room by room
Product Overview
Indoor air quality is the comfort factor people notice first—and the one that affects them most directly. Stuffy, stale air causes drowsiness, headaches, and reduced productivity within minutes. The Midea VC Max Dedicated Outdoor Air System (DOAS) solves this problem at the source by continuously supplying properly conditioned fresh outdoor air to every connected zone—pre-cooled or pre-heated, dehumidified or humidified as needed—so that the air people breathe is always fresh, clean, and at the perfect temperature.
With a capacity range of 8 to 24 HP and airflow from 16,000 to 40,000 m³/h, the VC Max serves commercial spaces of all sizes—from single-floor offices to multi-story buildings where fresh air distribution is a critical design challenge. Unlike opening windows (which introduces uncontrolled humidity, noise, and pollutants) or relying on infiltration (which wastes energy), the VC Max delivers precisely the right amount of outdoor air, conditioned to near-room conditions before it enters the space. This approach eliminates the energy penalty typically associated with ventilation and ensures consistent comfort regardless of outdoor weather.
For building occupants, the difference is immediately perceptible: rooms feel fresher, people feel more alert, and the stuffy mid-afternoon slump that plagues poorly ventilated spaces simply does not occur. For building owners, the VC Max transforms indoor air quality from a complaint generator into a tenant satisfaction advantage—while maintaining energy efficiency through intelligent heat recovery and EC fan technology.
Key Features
Fresh Air That Actually Feels Good—Not Too Hot, Not Too Humid
Supplying outdoor air is easy. Supplying outdoor air that is comfortable when it enters the room is the real engineering challenge. On a 35°C summer day with 80% humidity, pumping untreated outdoor air into an office would make the space hot, sticky, and uncomfortable—defeating the purpose of ventilation. The VC Max solves this by deeply dehumidifying and pre-cooling outdoor air before it reaches the supply diffuser. The air that enters the room is typically at 18-22°C and 45-55% relative humidity—conditions that feel refreshing rather than oppressive.
This deep treatment is achieved through the system's dedicated refrigeration circuit, which cools the incoming air below its dew point to extract moisture, then re-heats it to the ideal supply temperature using heat recovery from the exhaust side. The result is fresh air that enhances the main HVAC system's performance rather than fighting against it—improving both comfort and efficiency simultaneously.
- Deep dehumidification extracts moisture from outdoor air before it enters the space
- Pre-cooled supply air at 18-22°C—refreshing, not oppressive
- Supply air at 45-55% relative humidity—comfortable indoor moisture levels
- Heat recovery re-heats supply air efficiently without additional energy input
- Fresh air enhances main HVAC performance rather than working against it
- Eliminates the hot, sticky feeling from untreated ventilation air on humid days
Better Air Quality Means Better Work, Better Sleep, Better Health
The connection between indoor air quality and human performance is well-documented in building science research. Elevated CO2 levels above 1,000 ppm cause measurable declines in cognitive function, decision-making ability, and concentration. The VC Max maintains CO2 levels within the 600-800 ppm range recommended by ASHRAE and WHO guidelines—a range that keeps occupants alert, focused, and comfortable throughout the working day.
For healthcare environments, proper ventilation dilutes airborne pathogen concentration, reducing transmission risk. For educational spaces, fresh air improves student attention spans and test scores. For hospitality environments, guests sleep better and wake more refreshed. The VC Max is not just a ventilation machine—it is an investment in the health and performance of the people inside the building.
- Maintains CO2 within 600-800 ppm—ASHRAE and WHO recommended range for cognitive performance
- Elevated CO2 above 1,000 ppm causes measurable cognitive decline—VC Max prevents this
- In healthcare: dilutes airborne pathogens, reducing transmission risk
- In education: improves student attention spans and test performance
- In hospitality: guests sleep better and wake more refreshed
- Direct investment in occupant health, productivity, and well-being
Energy Recovery—Fresh Air Without the Energy Penalty
The traditional objection to increased ventilation is energy cost: conditioning outdoor air requires significant energy when outdoor conditions differ from indoor set points. The VC Max addresses this with an integrated energy recovery system that transfers thermal energy from the exhaust air stream to the incoming fresh air stream. In cooling mode, the relatively cool exhaust air pre-cools the hot incoming outdoor air. In heating mode, the warm exhaust air pre-heats the cold incoming air. This exchange reduces the energy required to condition fresh air by 40-60%.
The system's EC fan motors further minimize energy consumption, using up to 60% less electricity than conventional AC fan motors. Combined with the variable-speed compressor that modulates output to match actual ventilation demand, the VC Max delivers premium air quality with minimal operating cost impact—making continuous fresh air ventilation economically viable for commercial buildings of all sizes.
- Integrated energy recovery transfers thermal energy from exhaust to incoming fresh air
- Reduces fresh air conditioning energy by 40-60% compared to untreated ventilation
- EC fan motors use up to 60% less electricity than conventional AC motors
- Variable-speed compressor modulates output to match actual ventilation demand
- Continuous fresh air ventilation becomes economically viable for all commercial buildings
- Lower total ventilation cost than opening windows—with dramatically better air quality
Humidity Control That Protects the Building and Its Contents
Excess indoor humidity is not just uncomfortable—it is destructive. Mold growth on walls and ceilings, warping of wooden furniture and flooring, corrosion of electronic equipment, and deterioration of documents and inventory are all consequences of uncontrolled moisture. In tropical and subtropical climates, where outdoor humidity regularly exceeds 80%, the VC Max's deep dehumidification capability protects both the building structure and the valuable contents within it.
The system maintains indoor relative humidity within the 40-60% range recommended for both human comfort and material preservation. For environments with specific humidity requirements—server rooms, archives, museums, pharmaceutical storage—the VC Max provides the precise moisture control needed to protect sensitive contents while still delivering the fresh air that occupied spaces require.
- Maintains indoor relative humidity within 40-60%—optimal for comfort and material preservation
- Prevents mold growth, wood warping, and electronic corrosion from excess moisture
- Deep dehumidification effective even in tropical climates with 80%+ outdoor humidity
- Protects sensitive contents: server rooms, archives, museums, pharmaceutical storage
- Precise moisture control protects building structure and valuable inventory
- Fresh air delivery continues without introducing excess humidity
Seamless Integration with Any HVAC System
The VC Max is designed to complement—not replace—the primary heating and cooling system. Whether the building uses V8 series VRF, fan coil units, air handling units, or any other climate system, the VC Max integrates as a dedicated fresh air partner. Its supply air connects directly to the building's duct distribution system or can serve as an independent fresh air duct network.
The system communicates with mainstream BMS platforms via native BACnet and Modbus RTU, enabling coordinated operation with the primary HVAC system. When the main system adjusts zone temperatures, the VC Max can modulate its supply air conditions to complement the change. This coordination eliminates the conflicts between ventilation and temperature control that often cause comfort complaints in buildings with separate systems.
- Designed as a fresh air partner to any primary HVAC system—VRF, FCU, AHU, or other
- Direct connection to building duct distribution or independent fresh air duct network
- Native BACnet and Modbus RTU for coordinated BMS operation
- Modulates supply air conditions to complement primary system zone adjustments
- Eliminates conflicts between ventilation and temperature control systems
- Flexible installation: ceiling suspended, floor standing, or outdoor mounting options
Visible Comfort Improvement—Tenants Notice Immediately
Of all the HVAC upgrades a building owner can make, adding a dedicated fresh air system is the one that tenants and occupants notice most immediately. Within minutes of the VC Max beginning operation, people in the building feel the difference: the air feels lighter, clearer, more energizing. The stuffy, recycled-air feeling that characterizes poorly ventilated commercial spaces disappears. Complaints about headaches, drowsiness, and "bad air" drop to zero.
For building owners and property managers, this immediate perceptual shift translates into tangible business benefits: higher tenant satisfaction scores, improved lease renewal rates, and a compelling marketing differentiator when competing for quality tenants who increasingly prioritize health and well-being in their space selection decisions.
- Occupants notice the difference within minutes—air feels lighter, clearer, more energizing
- Stuffy, recycled-air feeling disappears completely
- Headache and drowsiness complaints drop to zero
- Higher tenant satisfaction scores and improved lease renewal rates
- Compelling marketing differentiator for attracting health-conscious quality tenants
- The single most noticeable HVAC upgrade for immediate occupant perception improvement
Technical Specifications
| Parameter |
VC Max |
| Capacity Range |
8-24 HP |
| Airflow Range |
16,000 - 40,000 m³/h |
| Function |
Dedicated Outdoor Air System (DOAS) |
| Dehumidification |
Deep dehumidification to 45-55% RH supply |
| Energy Recovery |
Integrated thermal energy recovery (40-60% reduction) |
| Fan Motor |
EC—up to 60% less energy vs. AC motors |
| Supply Air Temperature |
18-22°C (pre-cooled/pre-heated) |
| CO2 Control |
Maintains 600-800 ppm indoor levels |
| Refrigerant |
R32 (GWP 675) |
| Communication Protocols |
Modbus RTU / BACnet |
| Anti-Corrosion |
Gold Fin condenser coating |
| Protection Rating |
IP55 |
| Warranty |
5 Years |
| Origin |
China |
| Brand |
Midea / Hongtai |
Applications
- Commercial offices where occupant productivity and well-being depend on fresh air quality
- Hotels seeking to differentiate guest rooms with superior air quality and sleep comfort
- Hospitals and clinics requiring pathogen dilution and infection control ventilation
- Schools and universities where fresh air improves student attention and learning outcomes
- Retail stores and shopping malls where fresh air keeps shoppers comfortable longer
- Restaurants and hospitality venues balancing ventilation with energy efficiency
- Server rooms and data centers requiring humidity control alongside fresh air supply
- Museums, archives, and libraries protecting sensitive collections while ventilating occupied areas
- Fitness centers and gyms where high ventilation rates are essential for occupant comfort
- Any commercial space where tenants have complained about stale air, stuffiness, or poor air quality
Certifications & Standards
- TUV Certified—Performance and safety testing per EN 14511 / EN 14825
- CE Marking—European conformity for electrical safety and EMC
- RoHS Compliant—Restriction of Hazardous Substances
- ISO 9001—Quality Management System
- ISO 14001—Environmental Management System
- ISO 45001—Occupational Health and Safety Management
- R32 Refrigerant—A2L classification per ASHRAE Standard 34
- IP55 Ingress Protection—IEC 60529
- Gold Fin Coating—Marine-grade anti-corrosion performance
- ASHRAE 62.1 Compliant—Meets ventilation rate requirements for commercial spaces
- WHO Indoor Air Quality Guidelines—Supports recommended CO2 and humidity ranges
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