Mitsubishi Electric City Multi PUHY-P VRF Series: The Flagship for Large Commercial Projects

When large buildings demand precision climate control, the Mitsubishi Electric City Multi PUHY-P VRF Series is a proven choice. From high-rise offices to healthcare facilities, hotels, and educational campuses, this system delivers high-capacity heating and cooling with outstanding flexibility.

Explore our commercial installation services:
https://www.climateworks.co.uk/commercial-air-conditioning

Why PUHY-P Matters in the City Multi Line-Up

The PUHY-P is Mitsubishi Electric’s air-source heat pump VRF designed for commercial and industrial-scale applications. With advanced inverter-driven technology, modular scalability, and long piping runs, it provides reliable solutions for projects where conventional systems cannot deliver the same performance.

It is especially suited for:

• Multi-storey office towers with diverse load profiles
• Large hotels where simultaneous comfort across hundreds of rooms is required
• Universities, schools, and research centres
• Healthcare facilities with strict temperature requirements
• Retail and leisure complexes needing independent tenant zoning
• Phased developments where future expansion is expected

PUHY-P Outdoor Unit Range

The PUHY-P range spans multiple models to suit project needs, from single modules to large-scale multi-unit systems.

Representative models include:

• PUHY-P250YNW-A2 – 25.0 kW (8 HP)
• PUHY-P300YNW-A2 – 30.0 kW (10 HP)
• PUHY-P350YNW-A2 – 35.0 kW (12 HP)
• PUHY-P400YNW-A2 – 40.0 kW (14 HP)
• PUHY-P450YNW-A2 – 45.0 kW (16 HP)
• PUHY-P500YNW-A2 – 50.0 kW (18 HP)
• PUHY-P550YNW-A2 – 55.0 kW (20 HP)
• PUHY-P600YNW-A2 – 60.0 kW (22 HP)

Scalability:

• Outdoor modules can be combined up to 150 HP, providing systems well above 400 kW.
• Multiple refrigerant circuits allow balanced load distribution.
• Compact footprints make rooftop installations achievable even on constrained sites.

Indoor Unit Compatibility

The PUHY-P series integrates with the full City Multi indoor range, giving contractors and designers flexibility across zones.

Indoor unit options include:

• 4-way cassettes – optimal for open-plan offices and retail
• 2-way and compact cassettes – suitable for corridors and small rooms
• Ducted units – slim, medium, and high static options for hidden comfort
• Ceiling-suspended units – when false ceilings are unavailable
• Wall-mounted units – simple zoning for small offices or classrooms
• Floor-standing units – perimeter heating and cooling
• AHU interface units – integration with mechanical ventilation systems

With over 100 different indoor models available, system design can adapt to both architectural requirements and user expectations.

Technical Specifications

Core capabilities of PUHY-P systems:

• Refrigerant: R410A
• Capacity range: 22–150 HP (modular)
• Max indoor units: 50+ per system (depending on capacity)
• Pipe length: Up to 1,000 m total, 165 m to farthest indoor unit
• Vertical rise: Up to 90 m
• Diversity ratio: Up to 150% indoor capacity vs outdoor rating
• Operating range: Cooling –5 °C to 46 °C; Heating –20 °C to 15 °C

These figures make PUHY-P suitable for everything from medium-sized offices to very large commercial estates.

Installation Guidance for PUHY-P

Outdoor Placement

• Ensure clear airflow to avoid recirculation
• Plan crane or lift access for high-rise rooftop locations
• Consider corrosion-protected finishes for coastal areas

Pipework

• Follow Mitsubishi Electric’s pipe-sizing charts for correct gas and liquid line dimensions
• Use branch joints and headers approved by the manufacturer
• Maintain slope and oil trap requirements for long risers

Electrical

• Provide dedicated power circuits with breaker protection
• Verify total system load when combining multiple modules
• Wire controllers using the City Multi control network (M-NET)

Controls and Integration

The PUHY-P system supports full integration with Mitsubishi Electric’s control solutions.

Options include:

• PAR-40 wired remote controllers for local zones
• Centralised control panels for whole-building scheduling
• M-NET control network linking all indoor and outdoor units
• BMS gateways for BACnet, Modbus, or LonWorks
• Cloud connectivity for off-site monitoring and performance analytics

These options allow facility managers to maintain oversight of energy usage, performance, and occupant comfort.

Local Project Examples

Basingstoke Business Park

A multi-tenant office required a scalable system to serve four separate occupiers. Three PUHY-P400YNW-A2 units were installed, each linked to a mix of cassette and ducted indoor units. Centralised control enabled independent scheduling by tenant.

Reading Hotel Development

A 120-room hotel used PUHY-P300 and P500 modules combined for 80 HP total capacity. Quiet ducted indoor units ensured guest comfort, while central control provided scheduling across the restaurant, bar, and conference areas.

Guildford Retail Complex

A shopping centre with varying tenant hours used PUHY-P250 and P350 units, allowing independent scheduling of each unit. Long pipe runs supported distribution across multiple floors.

Oxfordshire Education Facility

An academic building with laboratories and lecture halls used PUHY-P500 modules integrated with AHUs. Heat recovery and BMS integration reduced energy consumption while meeting ventilation requirements.

Benefits for Large Commercial Installations

• Scalability: From 25 kW to hundreds of kilowatts
• Flexibility: Wide range of indoor unit types and layouts
• Efficiency: Inverter-driven compressors improve seasonal performance
• Control: M-NET and BMS integration allow sophisticated building management
• Reliability: Mitsubishi Electric’s proven VRF platform ensures longevity

Q: How many indoor units can a PUHY-P system support?
Depending on capacity, up to 50 or more indoor units can be connected.

Q: Can I expand the system later?
Yes. Modular outdoor units allow future expansion without replacing existing infrastructure.

Q: What is the maximum pipe run?
Up to 1,000 m total, with 165 m to the farthest indoor unit.

Q: Is BMS integration possible?
Yes. PUHY-P integrates with BACnet, Modbus, and LonWorks through Mitsubishi Electric’s gateways.

Q: What’s the noise level of outdoor units?
Units feature low-noise modes suitable for urban and rooftop applications.

Q: Is PUHY-P suitable for high-rise buildings?
Yes. With 90 m vertical separation, it fits multi-storey projects.

Installation Tips for Contractors

• Carry out detailed load calculations before selection
• Confirm electrical capacity for multi-module systems
• Use manufacturer-approved accessories for pipework and control connections
• Commission with Mitsubishi Electric’s software tools for accuracy
• Provide client handover training to maximise control benefits

Why ClimateWorks Recommends PUHY-P

For projects across Hampshire, Berkshire, Surrey, and Oxfordshire, the PUHY-P VRF series is a proven solution for large-scale developments. It offers unmatched scalability, flexible indoor options, and advanced controls, ensuring reliable climate management for decades to come.

Learn more:
https://www.climateworks.co.uk/commercial-air-conditioning

References

1. Mitsubishi Electric City Multi PUHY-P Product Catalogue
2. Mitsubishi Electric Technical Installation Manual – VRF Systems
3. CIBSE Guide B2: Ventilation and Air Conditioning
4. IET Wiring Regulations (BS 7671)

Author Bio
Dr. Julian Carter is a highly experienced thermal systems expert with over 15 years in the field, holding a PhD in thermal systems. His career spans academic research, consulting, and teaching, focusing on air conditioning and refrigeration systems. Dr. Carter bridges the gap between theoretical advancements and practical applications, providing expert insights to organisations like ClimateWorks, where his guidance informs decision-making and industry best practices. Notably, he has worked on international projects with organisations such as Daikin Industries, the International Institute of Refrigeration (IIR), and the United Nations Environment Programme (UNEP). These collaborations addressed energy efficiency, sustainable refrigerants, and advanced cooling technologies. Currently a lecturer at Edinburgh University, Dr. Carter combines his expertise with a passion for educating the next generation of engineers and advancing climate control technologies.

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