Mitsubishi enhances air conditioning unit models

Mitsubishi Electric launches a series of water-cooled VRF air conditioning systems.

The systems offer a COP of 6.06 in heating and 5.71 in cooling.

The WY/WR2 YHM range comes in a modular system and is available in both a WY (Heat pump) and WR2 (Heat recovery) option.

Units are 40 per cent shorter and half the volume ratio compared to the previous model.

The units deliver from 8HP to 24HP and have a lower weight, reduced noise and increased maximum pipe lengths.

Mitsubishi Electric is also planning to launch a triple module WY system which will deliver up to 36HP.

The YHM range has been redesigned to offer flexibility with the ability to connect to 50 indoor units, enabling easier maintenance including front panel access to all printed circuit boards and a weight reduction of 25 per cent.

The range offers one reduced chassis size and the ability to link two systems together with a twinning kit.

New features include rotation, backup and automatic refrigerant status check.

The height has been reduced from 1,800mm to 1,100mm and the width from 990mm to 880mm while the depth remains at 550mm.

The two module systems need a new twinning kit.

The models are 53 per cent of the volume ratio of the previous model and offer low noise levels.

The range is designed to be installed inside a building.

The models offer full inverter control from 20-100 per cent.

The system will run at part load for the majority of the time improving efficiency and keeping noise levels down.

The PQRY-P250YHM-A is 49dBA in low noise mode, a reduction of 3dBA compared to previous models.

An inverter scroll compressor improves efficiency and a control box design improves reliability and ease of maintenance.

The two plate heat exchangers reduce the overall size and improve the efficiency further.

The dual plate refrigerant to water heat exchangers offers efficiency at low water temperatures of -5C.

The system is suitable for ground source applications.

The systems are connectable to City Multi indoor units.

The total piping length has been increased to 500m for the two module system, with the distance between the outdoor and the furthest indoor increased to 165m.

In the dual module system, the load is balanced between the units, with the first module taking the initial load of 20-50 per cent for a set time, then the second module takes over this initial load.

This allows the system to carry on if one of the modules fails, allowing time for repairs without a full loss of operation.

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