1. Product Overview

MRACV-LH Pro series is a new generation of full DC inverter modular air-cooled heat pump independently developed by Monchrui under the "Dual Carbon" energy-saving strategy. It integrates mature DC inverter technology and EVI jet enthalpy low-temperature heating system, solving the pain points of heating capacity attenuation and high power consumption of traditional air-cooled units.

This all-in-one cooling & heating unit requires no supporting cooling tower, simplifies pipeline construction, and supports free modular splicing & phased capacity expansion. It fits all new and renovated commercial & industrial buildings. The unit delivers stable heating at ambient temperature as low as -27℃ and full-load cooling under 50℃ high summer temperature. Widely applied to hotels, hospitals, office buildings, factories, supermarkets and cinemas, it becomes the top central HVAC solution for water-shortage, noise-sensitive sites without space for cooling towers.

Every unit passes long-term laboratory verification including corrosion resistance, frequent start-stop and extreme condition tests, plus 100% full online factory inspection. Equipped with multi-layer electrical & waterway protection, it ensures stable all-year-round operation.

2. 9 Core Competitive Advantages

2.1 Grade 1 Top Energy Efficiency, Cut Long-term Operation Cost

Adopts full DC inverter system with 30~120Hz stepless compressor adjustment, accurately matching actual load to eliminate energy waste from frequent start-stop of fixed-frequency units:

• IPLV(c) up to 4.65 (National Grade 1 Energy Efficiency GB19577-2015)

• IPLV(h) up to 3.35 (National Grade 1 Energy Efficiency GB37480-2019)

  Outstanding energy-saving performance under partial load greatly reduces air conditioning electricity expense for building owners.

2.2 EVI Jet Enthalpy Tech, Stable Heating Down to -27℃

High-efficiency stainless steel brazed plate economizer forms quasi two-stage compression cycle, lifting low-temperature heating capacity by around 14%.

Conventional air-cooled heat pumps suffer severe heating attenuation below -10℃, while this series maintains steady hot water output at -27℃ ambient temperature. It perfectly replaces coal-fired boilers for clean & low-carbon heating in frigid northern regions.

2.3 Interchangeable Master-Slave Modular Design, No System Shutdown For Fault

Exclusive industry master-slave interchange architecture:

• Any module can act as master unit. If one module fails, only the faulty part is isolated, the rest keep running (traditional systems shut down entirely once master module breaks);

• Modules of 65/130/150kW different capacities can be arbitrarily combined. Projects can install basic load first and expand capacity later to lower initial investment;

  Multiple combined units uniformly control supply/return water temperature based on master setting, bringing flexible system scheduling & convenient commissioning & maintenance.

2.4 Comprehensive Multi-layer Safety Protection, 24/7 Reliable Operation

16 built-in hardware & software intelligent protections with real-time pop-up fault alarm & record:

Compressor high/low pressure / out-of-step / overcurrent / discharge overheat protection, IPM module protection, DC bus over/under voltage, phase loss protection, frequent startup limit, unit overheat & freeze prevention, insufficient water flow differential pressure protection, sensor self-check etc.

Standard factory configuration includes Y-type water filter & water differential pressure switch to avoid heat exchanger cracking caused by water shortage or impurity blockage.

2.5 AI Staggered Defrost Technology, Continuous Heating Without Temperature Drop

Dual intelligent defrost guarantee:

1. AI multi-dimensional judgment defrost: Collect system pressure, water temperature, ambient temp, running time & superheat data to accurately judge defrost timing, reducing unnecessary defrost frequency & duration;

2. Dual-circuit staggered defrost for single unit: One circuit defrosts while the other keeps heating, avoiding sharp indoor temperature drop during defrost, greatly improving heating comfort.

2.6 Full Vibration-Isolated Low Noise Design, Silent Mode For Sensitive Scenarios

Fully enclosed metal sound insulation cabinet & independent compressor sound absorption box; low-noise airfoil fan blades with DC stepless speed motor adjustable from 200~960rpm. IP55 waterproof motor works stably under heavy rain & strong wind outdoors.

Dedicated silent operation mode automatically lowers fan & compressor frequency at night, ideal for hospitals, libraries, commercial buildings near residential blocks with strict noise limits.

2.7 AIoT Intelligent Control System, Mobile Remote Management

1. Wired large LCD controller: Cooling/heating switch, weekly timer, water pump interlock, anti-freeze parameter setting, historical fault query, 1000m long-distance wired control supported;

2. Tuya WIFI IoT: Check real-time unit data & switch 4 operation modes via mobile APP anytime anywhere;

3. Standard RS485 communication port: Seamlessly connect with building BMS system, manage up to 1024 fan coils (32 groups × 32 terminals) in one network for centralized control of large building complexes.

   Free switching between supply water control & return water temperature control to match different HVAC design schemes.

2.8 Eco-friendly R410A Refrigerant, Higher Heat Exchange Efficiency

Chlorine-free R410A refrigerant with zero Ozone Depletion Potential (ODP), complying with global environmental regulations. Less refrigerant charge under same cooling capacity; brazed plate heat exchanger features high heat transfer efficiency & strong pressure resistance, suitable for high-rise building water systems.

2.9 Ultra-wide Operating Range, All-season Adaptability

• Cooling range: Ambient -10℃ ~ +50℃, no capacity attenuation under high-temperature factory & southern summer conditions;

• Heating range: Ambient -27℃ ~ +45℃, stable heating in northern extreme cold and constant temperature heating in southern winter.

3. Detailed Core Component Configuration

1. Full DC Inverter Scroll Compressor

   Special low-temperature inverter scroll compressor equipped with liquid-cooled inverter drive board, more stable heat dissipation & longer service life than traditional air-cooled drives. Matched with dedicated POE refrigeration oil for reliable lubrication under extreme working conditions.

2. High-efficiency DC Inverter Axial Fan

   200~960rpm stepless speed regulation, dynamically balanced mute blades automatically adjust speed based on condensation/evaporation temperature. Stable outdoor operation under heavy rain & strong wind without frequency reduction at high temperature.

3. Dual-circuit Stainless Steel Brazed Plate Heat Exchanger

   Dual high-low pressure channel design with high heat transfer coefficient & low water pressure loss, anti-scale corrosion, compatible with ethylene glycol antifreeze low-temperature water system. Real-time water flow differential pressure monitoring as standard.

4. 500-stage Precision Electronic Expansion Valve with PID Control

   Independent dual electronic expansion valves for main & auxiliary circuits, wide dynamic flow adaptation, automatic load matching all year round. Water temperature control accuracy ±0.1℃ for uniform indoor temperature without hot/cold spots.

5. Film Capacitor Inverter Module

   Compared with traditional electrolytic capacitors, it features longer service life, lower heat generation, higher power factor & stronger anti-grid fluctuation capability, stable operation in factories with unstable power supply.

4. Four Operation Modes For Time-divided Demand

1. Standard Mode: Factory default balanced frequency, general daily use for balanced cooling & heating;

2. Powerful Mode: Overclock output within safety limit for rapid cooling/heating, emergency response under extreme heat/cold;

3. Silent Mode: Low-frequency low-noise operation, activated at night, hotel guest rooms & hospital wards;

4. Energy-saving Mode: Set segmented water temperature thresholds to automatically reduce load during off-peak hours, drastically cutting electricity bills.

5. Main Application Scenarios

1. Commercial Public Buildings: Star hotels, general hospitals, office towers, shopping malls, cinemas, gymnasiums; integrated cooling & heating replaces split air conditioners & boilers.

2. Industrial Workshops: Production plants, logistics warehouses, precision equipment workshops, summer cooling & winter heating without cooling tower to save site space.

3. Northern Low-temperature Heating Renovation: Residential districts, township public buildings replace coal/gas boilers for air-source clean heating, complying with emission reduction policies.

4. Restricted Special Sites: Water-shortage factories, scenic supporting facilities, underground malls, shops under residential buildings; priority choice where cooling towers/boilers cannot be installed.

5. New Construction Supporting Projects: Schools, nursing homes, government buildings, modular phased construction reduces upfront investment pressure.

6. Specification & Installation Guide

6.1 Basic Single Module Specs

Three standard single-module capacities: 65kW / 130kW / 150kW, combinable from 1 to 5 units to stack total cooling/heating load as required. Anti-rust sprayed metal sheet, fixed by ground bolts, only flat hardened foundation needed without dedicated machine room.

6.2 Water Circuit Compatibility

Supports constant & variable flow water systems, with reserved mounting position for Y-type filter & differential pressure bypass valve. Ethylene glycol antifreeze solution with corresponding concentration must be added in low-temperature environments. Datasheet attached with ethylene glycol concentration-freezing point chart & water quality standard to prevent heat exchanger corrosion & cracking.

6.3 Installation Advantages

Light single module weight for easy hoisting & transportation; no cooling tower system drastically cuts investment on civil engineering, pipelines & water pumps. Only 800mm maintenance passage required between units, installable on rooftops or ground.

7. Quality Control & After-sales Support

All units pass full performance test via Keysight & R&S professional instruments, with 100% water & power on inspection before delivery. Extended whole-unit warranty supported. Professional HVAC FAE engineers provide one-stop technical service including pre-project load calculation, machine room layout, water circuit design, on-site commissioning & maintenance guidance nationwide.