The Cooper&Hunter CHML-U42RK5-NG is a powerful inverter outdoor unit designed for a multi-split air-conditioning system with 2 to 5 compatible indoor units. It is an excellent solution for apartments, private houses, offices and other multi-room spaces where several indoor units need to be connected to a single outdoor unit.
Key Features
Multi-Split System for Up to 5 Rooms– The main advantage of the CHML-U42RK5-NG is the ability to connect up to five indoor units to a single outdoor unit. This significantly simplifies the external appearance of a building compared with installing a separate outdoor unit for every room. The system can be configured for different room sizes by combining compatible Cooper&Hunter indoor units. The manufacturer specifies an allowable system capacity range of approximately 50–150% of the outdoor unit’s rated capacity, depending on the selected combination and operating conditions.
This makes the system suitable for:
- Private houses
- Large apartments
- Multi-room apartments
- Offices
- Small hotels
- Commercial premises
- Multi-zone residential installations
Powerful Cooling– With a nominal cooling capacity of 12.10 kW, the CHML-U42RK5-NG is designed to serve multiple rooms simultaneously. The system supports up to five indoor units, allowing each room to have its own independently controlled indoor unit while using one shared outdoor compressor unit.The maximum outdoor airflow reaches 5,800 m³/h, helping efficiently dissipate heat from the outdoor heat exchanger.
Efficient Heating– The outdoor unit provides a nominal 13.00 kW heating capacity, making it suitable for year-round operation. The current manufacturer specification gives a heating operating range down to −22°C, which makes the system suitable for regions with cold winters and allows it to function as an air-to-air heat pump in addition to providing summer cooling.
Inverter Technology– The inverter compressor adjusts its operating frequency according to the current demand from the connected indoor units.
This provides several advantages:
- More stable indoor temperatures
- Reduced power consumption at partial load
- Smooth compressor operation
- Lower mechanical stress
- Improved comfort
- Efficient operation when only part of the system is required
The system also uses an electronic expansion valve (EEV) for accurate refrigerant flow control.
R32 Refrigerant– The CHML-U42RK5-NG uses R32 refrigerant, a modern refrigerant widely used in contemporary air-conditioning and heat-pump systems. The factory charge is 2.40 kg, with an additional refrigerant charge of 20 g per metre when required according to the installed pipe length. The standard factory filling length is 50 m.
Flexible Installation
One of the key advantages of this model is its extensive piping capability.
| Installation Parameter | Maximum Value |
|---|---|
| Total refrigerant pipe length | 100 m |
| Distance to furthest indoor unit | 25 m |
| Maximum height difference | 25 m |
| Standard factory filling | 50 m |
| Additional refrigerant | 20 g/m |
This provides considerable flexibility when installing the system in larger houses or multi-room commercial spaces.
Outdoor Unit Noise– The manufacturer’s catalogue specifies an outdoor sound pressure level of approximately 60 dB(A). Because this is a relatively powerful multi-split outdoor unit, its installation location should be selected carefully. Professional mounting, vibration isolation and sufficient clearance around the unit are recommended to minimize transmitted vibration and noise.
Reliable Operation
The Nordic Multi Light R32 NG series incorporates several technologies designed for reliable operation, including:
- Inverter technology
- Intelligent defrosting
- Automatic anti-icing protection
- Crankcase heating
- Multi-speed outdoor fan
- Auto Restart
- Self-monitoring
- Self-diagnosis
- Voltage protection
- Blue Fin anti-corrosion coating
- Stable low-frequency operation
Cooper&Hunter also specifies a safe starting range of 96–260 V for the Nordic Multi Light R32 NG series.
Wide Operating Temperature Range– The CHML-U42RK5-NG is designed for year-round operation:
Cooling: −15°C to +43°C
Heating: −22°C to +24°C
This makes the system suitable for both summer cooling and winter heating in climates with significant seasonal temperature variation.
Recommended Area– A configuration with five indoor units can be used for a total conditioned area of approximately up to 120 m² as a general guideline.
However, the actual required capacity should always be calculated based on:
- Room size
- Ceiling height
- Insulation quality
- Window area
- Solar exposure
- Number of occupants
- Heat-generating equipment
- Desired indoor temperature
- Number and capacity of connected indoor units
Therefore, 120 m² should be treated as an indicative value rather than a guaranteed coverage area.
Compatible Indoor Units
The CHML-U42RK5-NG is intended to work with compatible Cooper&Hunter multi-split indoor units. Depending on the project, the system can be configured using different indoor-unit formats, such as:
- Wall-mounted units
- Cassette units
- Console units
- Floor-ceiling units
- Duct-type units
The exact combination should be checked against the manufacturer’s approved combination tables before installation.
Installation Considerations
Because this is a multi-split outdoor unit, the complete system must be designed as a matched combination of outdoor and indoor units.
Before purchasing, verify:
- Compatibility of every selected indoor unit.
- Total connected capacity.
- Refrigerant pipe lengths.
- Height differences between units.
- Required additional R32 refrigerant.
- Electrical power requirements.
- Drainage requirements for every indoor unit.
- Installation clearances around the outdoor unit.
Installation should be performed by a qualified HVAC technician.
| Specification | Value |
|---|---|
| Model | CHML-U42RK5-NG |
| Series | Nordic Multi Light R32 NG |
| Type | Multi-Split Outdoor Unit |
| Number of Connectable Indoor Units | 2–5 |
| Nominal Cooling Capacity | 12.10 kW |
| Nominal Heating Capacity | 13.00 kW |
| Cooling Capacity | ≈41,300 BTU/h |
| Heating Capacity | ≈44,300 BTU/h |
| Rated Power Consumption – Cooling | 3.40 kW |
| Rated Power Consumption – Heating | 3.19 kW |
| SEER | 7.20 |
| SCOP | 4.20 |
| Cooling Energy Class | A++ |
| Heating Energy Class | A+ |
| Outdoor Airflow | 5,800 m³/h |
| Outdoor Unit Sound Pressure Level | 60 dB(A) |
| Refrigerant | R32 |
| Factory Refrigerant Charge | 2.40 kg |
| Additional Refrigerant | 20 g/m |
| Standard Refrigerant Pipe Length | 50 m |
| Power Supply | 220–240 V / 50 Hz / 1 Phase |
| Cooling Operating Range | −15°C to +43°C |
| Heating Operating Range | −22°C to +24°C |
| Maximum Total Pipe Length | 100 m |
| Maximum Pipe Length to Furthest Indoor Unit | 25 m |
| Maximum Height Difference | 25 m |
| Liquid/Gas Pipe Connection | 5 × 1/4″ / 3/8″ |
| Outdoor Unit Net Weight | 73 kg |
| Outdoor Unit Gross Weight | 80 kg |
| Outdoor Unit Dimensions (W × H × D) | 1020 × 826 × 427 mm |
| Compressor | Inverter / Rotary |
| EEV | Electronic Expansion Valve
|
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