Toshiba Air Conditioners - VRF-systems - SMMS Outdoor Units
Toshiba SMMS key features
The 2-pipe VRF Super Modular Multi System (SMMS) operates with R-410A refrigerant and incorporates the latest inverter technology in all outdoor unit models. In addition, the SMMS incorporates twin-inverter compressors in every outdoor unit.
The capacities range from 14 to 135 kW in cooling mode and 16 to 150 kW in heating mode with the capability to serve up to 48 indoor units. 13 different indoor unit models available in 81 sizes ensure system flexibility.
Toshiba SHRM, 3-pipe VRF system with heat recuperation, were installed on many objects all over the world, for example:
World’s Best Class Energy Savings
COP of 4.25* achieved by Toshiba’s unrivalled Super Modular Multi System technologies and newly developed components:
- Part load operation
A VRF system can achieve energy efficient operation especially in a separated room layout as shown. Not all of the indoor units operate at the same time so the system is almost always operating with a partial indoor unit load. Toshiba SMMS has a world's highest COP at a part load - up to 5.73
- Vector-controlled inverter
The inverter boosts efficiency by controlling R410A and a twin-rotary DC compressor. Smooth sine current curve realizes higher efficiency and less noise.
- Outdoor heat-transfer
Compact heat-transfer tube with intakes on four sides. Tubes with improved heat-transfer coefficient of the inner surface.
Dual DC twin-rotary compressor
Toshiba sets new technological standards, incorporating DC twin rotary compressors in all SMMS outdoor units, compatible with the high density refrigerant R-410A. Thanks to the use of these dual-compressor systems, the system operation load is distributed more evenly, with a special controller regulating the operating sequence of outdoor units and individual compressors.
This innovative technology also allows optimisation and balancing of the operating time for each component, considerably enhancing the reliability of the complete system. Toshiba control systems select the heat exchanger and compressor to supply the required capacity in the most efficient way. This operating method can reduce the power input by up to 30% compared with a traditional on/off system.
Each SMMS outdoor unit features two inverter-driven twin-rotary compressors. A twin-rotary compressor has two fixed compression chambers. An off -centre roller orbits each chamber to squeeze the refrigerant. The two rollers are both mounted on the same shaft, but are off set to provide counter balance to each other. The contact force required between the roller and chamber wall is lowered. This means that smaller bearings can be used and lubrication demand is reduced, saving weight and making this type of compressor more suited to lowspeed operation.
Toshiba active oil management system
The active oil management system developed by Toshiba continually monitors the level of oil in all compressors, should an oil shortage be detected in any compressor, oil is automatically transferred from a compressor in another outdoor unit. The two compressors in an individual SMMS outdoor unit are connected by way of an oil balancing pipe to ensure a uniform oil levels within the two compressors.
1) Oil balance control. This control equalizes amount of oil between two compressors.
2) Oil supply control. This control accumulates oil in the oil separator. When oil is insufficient, the system supplies oil to the compressors.
3) Oil supply control between outdoor units. This control supplies oil accumulated in the oil tank of each outdoor unit to the outdoor unit with insufficient oil.
The versatility of the SMMS means that virtually any configuration of the refrigerant Y-type branches and/or header piping can be used in an application to give the shortest, most cost-effective piping installation. The piping can be run in any direction to facilitate refurbishment work.
Line and header branching after header branching are Unique Toshiba's systems!
Extended piping capabilities of Toshiba SMMS system:
- Maximum actual length - 150 m
- Farthest equivalent length - 175 m
- Extension - 300 m
- Maximum height difference - 50 m (outdoor unit is higher than indoor unit)
- Maximum height difference, outdoor unit is lower than indoor unit - 40 m
- Maximum height difference between indoor units - 30 m
- Maximum length from first branch - 65 m
Wide variety in SMMS indoor unit line-up
Up to 48 indoor units can be connected to a single Toshiba SMMS system. There are 13 different indoor unit models available in 81 sizes. The large choice of indoor unit models and sizes compatible with the VRF range ensures the ideal solution for any application requirement.
The performances of all units are maximised: low sound levels, optimised air flows and the extremely compact design that reduces installation time and costs. Moreover, the recent additions to the range, the compact high-wall and the slim duct units, reaffirm Toshiba’s commitment to create the perfect climate and well-being for business users. Toshiba provides the ideal climate and comfort levels, ensuring a healthy environment, high technology, maximised efficiency and modern design.
All indoor unit are applicable for all Toshiba VRF systems (SMMS, SHRM and MiNi-SMMS).
Toshiba SMMS protection devices
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- Discharge and suction temperature sensors
- Internal overload relay
- Compressor over-current relay
- Over-current sensor
- High pressure switch
- Low pressure sensors