About the SCM71ZS-W
The Mitsubishi Heavy Industries SCM71ZS-W is a powerful and highly flexible outdoor condenser unit, forming the heart of a multi-split air conditioning and heat pump system. Engineered for performance and efficiency, it delivers a nominal 7.1kW of cooling and a substantial 8.6kW of heating, making it an ideal year-round climate control solution for multi-room applications in both homes and small commercial properties across the UK.
The key advantage of the SCM71ZS-W is its ability to connect with two, three, or four individual indoor units. This multi-split capability allows you to heat or cool multiple separate spaces using just one external unit, preserving the exterior aesthetics of your property and simplifying the installation process compared to fitting multiple single-split systems. This flexibility extends to the choice of indoor units; you can mix and match from a range of compatible models, such as wall-mounted, floor-standing, or ceiling cassettes, to best suit the decor and requirements of each room. Each connected indoor unit can be controlled independently, giving you personalised comfort zones throughout your property.
Energy efficiency is a standout feature of this model, which boasts an A++ energy label for its cooling performance. The advanced inverter technology continuously adjusts the compressor speed to meet the precise cooling or heating demand of the rooms, eliminating the inefficient stop-start cycles of older systems. This intelligent power management significantly reduces electricity consumption and lowers your energy bills, while providing more stable and comfortable indoor temperatures. Its robust performance is maintained even in extreme weather, with a wide operating range from -15°C up to +46°C, ensuring reliable comfort through cold British winters and warm summer heatwaves.
In line with modern environmental standards, the SCM71ZS-W utilises R32 refrigerant. This next-generation coolant has a Global Warming Potential (GWP) that is almost 70% lower than the previously common R410A. In addition to being a more responsible choice for the planet, R32 offers superior thermodynamic properties, contributing directly to the unit's impressive energy efficiency and requiring a lower refrigerant volume to operate effectively.
Designed for quiet performance, the unit's sound pressure level is as low as 50 dB(A) during cooling operation, comparable to a quiet conversation. This ensures that the system operates discreetly without causing a disturbance to you or your neighbours. Generous installation parameters, including a total possible pipe length of up to 70 metres, provide installers with the flexibility needed to position the outdoor unit conveniently and connect to rooms throughout a property, even in buildings with complex layouts.
Please note, while this system offers great flexibility, the manufacturer explicitly states that FDUM series ducted indoor units are not compatible with the SCM71ZS-W outdoor unit. Professional consultation is recommended to ensure selection of compatible indoor units. Crucially, UK law requires that this system must be installed by a qualified and F-Gas certified engineer. This ensures the system is fitted safely, operates correctly, complies with legal regulations, and validates the manufacturer's warranty.
Applications
- Multi-room residential properties and family homes
- Small office buildings with multiple private offices
- Dental or medical clinics with consultation rooms
- Retail spaces requiring climate control in different zones
- Large home extensions, annexes, or garden office suites
- Boutique hotels or guesthouses with several rooms
Installation guidance
- Installation must be performed by an F-Gas certified engineer to comply with UK law.
- Requires a dedicated 20A fused power supply.
- The unit is designed for outdoor installation on a solid ground-level base or secure wall brackets.
- Allows for a total combined pipe length of up to 70 metres to all indoor units.
- The system is pre-charged with R32 refrigerant for a default pipe length; longer runs require additional refrigerant at 20g/m.
- Features four sets of piping connections, each supporting 1/4" liquid and 3/8" gas lines.
- Sufficient clearance must be maintained around the unit for servicing and proper airflow.
- Important: FDUM series ducted indoor units are not compatible with this outdoor model.
Frequently asked questions
How many indoor units can I connect to the SCM71ZS-W?
You can connect between two and four indoor units to the SCM71ZS-W outdoor unit, making it suitable for multi-room applications.
What type of refrigerant does the SCM71ZS-W use?
This unit uses R32 refrigerant, which has a significantly lower Global Warming Potential (GWP) and is more energy-efficient than older R410A refrigerant.
Can I install this air conditioning unit myself?
No. In the UK, it is a legal requirement that any air conditioning system containing F-Gas refrigerants, like the SCM71ZS-W, must be installed and commissioned by a certified F-Gas engineer.
Can I use any type of Mitsubishi Heavy Industries indoor unit with this model?
You can mix and match various compatible MHI indoor unit styles, such as wall-mounted or ceiling cassettes, to suit each room. However, it is critical to note that FDUM series ducted indoor units are specifically not compatible with the SCM71ZS-W. Always verify compatibility with your supplier or installer before purchase.
