China Henan Hongtai HVAC Equipment Co., Ltd. Company News

The Rising Demand for VRF Systems and Why Proper Installation Matters Variable Refrigerant Flow (VRF) systems have revolutionized the commercial and residential HVAC industry, offering unmatched energy efficiency, zoning flexibility, and quiet operation. As global demand grows—with markets expanding rapidly in North America, Europe, and Asia—proper installation has never been more critical. A well-installed VRF system delivers: 30-40% higher energy efficiency compared to traditional HVAC Precision temperature control across multiple zones Longer system lifespan (15+ years with proper maintenance) However, up to 60% of VRF performance issues stem from installation errors. As HVAC engineers, your expertise ensures systems operate at peak performance from day one. Step-by-Step VRF Installation Guide 1. Pre-Installation Planning Key Considerations: Load Calculation: Match total indoor unit capacity to outdoor unit(s). Pro Tip: Indoor units can total 130% of outdoor capacity if not all operate simultaneously. Refrigerant Piping Design: Maximum piping length: 175m (actual)/200m (equivalent) Level difference: ≤90m (outdoor above indoor) or ≤110m (outdoor below) ⚠️ Critical Warning: "Incorrect piping distances cause oil return failure, leading to compressor damage." 2. Outdoor Unit Installation Best Practices: Foundation: Use 200mm-high concrete bases with Φ10mm steel reinforcement (Fig. 4-11). Spacing: Single-row: ≥1m clearance at sides/rear, 200-500mm from walls (Fig. 4-14) Multi-row: Stagger units to prevent airflow short-circuiting (Fig. 4-15) Master/Slave Configuration: Largest capacity unit = Master (e.g., 34HP unit on first branch) Common Mistake: Installing slave units before the master disrupts refrigerant distribution. 3. Refrigerant Piping Installation Copper Pipe Selection : Capacity (HP) Liquid Pipe (mm) Gas Pipe (mm) 8-14 Φ12.7 Φ25.4 26-34 Φ22.2 Φ38.1 Critical Steps: Nitrogen Purging: Flush pipes at 0.5MPa to remove contaminants (Fig. 5-13). Brazing: Use nitrogen flow during welding to prevent oxidation. Insulation: Apply closed-cell foam (≥19mm thickness) to prevent condensation. ⚠️ Safety Alert: "Never use oxygen or acetylene for purging—explosion risk!" 4. Electrical Wiring 3-Phase Power Requirements : HP Voltage Min. Circuit Amps (MCA) 8 380-415V 24A 34 380-415V 68.9A Wiring Rules: Separation: Keep communication cables ≥500mm from power lines (Fig. 6-1). Grounding: Use dedicated earth rods—never bond to water/gas pipes. Pro Tip: "Use shielded twisted-pair cables (0.75mm²) for communication lines to prevent interference." 5. System Commissioning 4-Step Startup Procedure: Vacuum Drying: Evacuate to -756mmHg for ≥2 hours (Fig. 5-16). Refrigerant Charge: Calculate additional charge based on pipe length (Table 5-9): Test Run: Cooling mode: 1 hour at 17°C (high fan) Heating mode: 1 hour at 30°C (high fan) Leak Check: Confirm refrigerant concentration

EVI Technology Scroll Compressor VRF System with 100 Connectable Indoor Units Operating Temperature down to -25°C   Product Description: The DC Inverter VRF system has a maximum number of connectable indoor units of 100, which makes it an ideal choice for larger spaces. With this system, you can easily control the temperature of multiple rooms with just one outdoor unit. This means that you can enjoy a comfortable living or working environment without the need for multiple air conditioning units. One of the most impressive features of the DC Inverter VRF system is its ability to provide heating in low temperatures. This makes it a great choice for areas with harsh winter climates. The system is designed to work even in temperatures as low as -25°C, ensuring that your space is always warm and comfortable. The DC Inverter VRF system is also highly efficient. It has a high COP (Coefficient of Performance) value, which means that it can provide more heating or cooling output for the same amount of energy input. This makes it an eco-friendly and cost-effective choice for those who want to reduce their energy bills. Another great feature of the DC Inverter VRF system is its high elevation difference capability. It can operate with a maximum elevation difference of 110m between the outdoor and indoor units. This makes it a great choice for high-rise buildings and multi-story homes. The DC Inverter VRF system has capacity of 25-360kW. This means that it is suitable for a wide range of spaces, from small apartments to large commercial buildings. The system is designed to provide a comfortable and consistent temperature throughout the space, regardless of its size. Finally, the DC Inverter VRF system uses R410A refrigerant, which is an eco-friendly and non-ozone depleting refrigerant. This means that it is safe for the environment and does not contribute to global warming.   Features: 1. Refrigerant Cooling Design We use refrigerant to cool down inverter modular board to keep it in a safe condition even when outdoor temperature is up to 55℃.   2. Wide Outdoor Operation Range Due to EVI technology, CHV PRO still has 85% of rated capacity even in -15℃.   3. Power Saving Mode According to power usage, realize 7-level power limit setting from 40% to 100%.   4. Refrigerant Status Detection Built-in with smart refrigerant auto check function, which can give suggestion about refrigerant status. Different code means different refrigerant status.   5. Service Window On Front Cover Thanks to the service window, checking outdoor units status and setting is now easy, no need to remove the front cover.   Technical Parameters: Technical Parameter Value Refrigerant R410A Cooling Capacity 25-360kW Outdoor Unit Types Compact, Modular Control System Centralized Control, Individual Control Compressor Type Scroll Piping Length up to 1000m Max. Elevation Difference 110m Max. Number Of Connectable Indoor Units 100 Indoor Unit Types Ceiling Cassette, Ducted, Floor Standing, Wall Mounted, Floor Ceiling Power Supply 3-phase, 380-415V, 50Hz