Commercial Inverter Heat Pump

EVI Scroll Compression: Intermediate vapor injection circuit increases refrigerant mass flow at low suction pressures, preventing discharge temperature spikes at -15°C ambient.

Modular Multi-Unit Cascading: Master-slave bus controller links up to 16 parallel units (total 2,880 kW output) with automatic runtime equalization and load staging.

Acoustic Isolation Assembly: Dual-density vibration absorbers mounted on compressor baseframes; internal cabinet lined with 30mm sound-absorbent melamine foam.

Dynamic Frost Detection: Multi-sensor array tracks evaporator coil temperature, ambient dew point, and net operating time to trigger reverse-cycle defrost only when coil airflow impedance exceeds threshold.

EVI Refrigerant Injection Loop Principle
Low Suction Pressure (-20°C) passes through the Plate Heat Exchanger (Economizer) to produce Sub-cooled Liquid entering the Expansion Valve, while simultaneously feeding Intermediate Vapor Injection directly into the Scroll Compression Chamber, stabilizing discharge temperature below 105°C.
Inverter Modulation Logic
Brushless DC (BLDC) inverter compressor modulates rotational speed from 20 Hz to 120 Hz, matching real-time building thermal load fluctuations and eliminating 50Hz/60Hz start-up current surges. 

District Central Heating: Multi-family residential complexes and municipal heating networks.

Hospitality Infrastructure: Hotels, resorts, and athletic complexes requiring simultaneous domestic hot water (60°C) and four-pipe hydronic climate control.

Institutional Facilities: Schools, universities, and healthcare centers utilizing fan-coil units (FCU) and air handling units (AHUs).

Industrial Pre-Heating: Low-temperature process water loops and agricultural greenhouse climate control.

Typical multi-unit cascade configuration for a 500 kW mechanical room installation:

Outdoor Ambient Air feeds multiple parallel units (Unit 1 180kW, Unit 2 180kW, Unit 3 140kW), converging into a Common Header Pipe (DN100), passing through a Plate Heat Exchanger / Buffer Tank, and distributing into the Primary/Secondary Hydronic Building Loop.

Hydraulic Layout: Configured with primary-secondary variable-flow pumping loops, hydraulic separator/buffer tank, and 3-way motorized diverting valves for sanitary hot water priority.

Control Architecture: Central master controller manages lead/lag rotation based on operating hours and real-time return water temperature sensor input.

Enclosure Materials: Structural frame in hot-dip galvanized steel; exterior panels available in powder-coated galvanized sheet or grade 304/316 stainless steel for marine environments.

Refrigerant Variants: Factory engineering validation available for R32, R290 (Propane), or R454B based on local environmental quota regulations.

Hydraulic Module Integration: Factory-fitted internal components including Wilo/Grundfos inverter circulation pumps, ASME/PED certified safety valves, and expansion vessels.

Controller Firmware: Customized Modbus address mapping, OEM brand splash screens, and localized HMI language packages.

Component Screening: Copper tube spectral analysis; compressor electrical winding resistance and insulation breakdown tests prior to chassis mounting.

Helium Mass Spectrometry: Refrigerant circuits pressurized to 3.0 MPa with helium gas; leak detection verified to tolerance threshold of 1 x 10^-7 Pa·m³/s.

100% Psychrometric Run-Test: Every assembled unit undergoes a 4-hour automated test cycle in psychrometric chambers from -25°C to +43°C, validating electrical input, thermal output, and vibration spectra.

Regulatory Compliance: ISO 9001, ISO 14001, CE-KEYMARK, ErP Efficiency Class A+++ (35°C outlet), and ETL listing.

To request technical proposal documentation, CAD drawings, or project-specific selection software outputs, submit the following parameters to our engineering team:

Design total thermal load requirements (kW)

Minimum winter ambient design temperature (°C)

Required water supply / return design temperatures (°C)

Local electrical grid standard (Voltage / Phase / Frequency)

Target certification standard (CE, ErP, ETL)