TECHNICAL SPECIFICATION
TOSHIBA SUPERMODULAR MULTI SYSTEM (S-MMSi)
(High level, Energy saving VRF system)
GENERAL
Multi-zone, multi-split, air-cooled, direct expansion system, with variable refrigerant flow management, working with green refrigerant R410A.
The system consists of one or more outdoor units connected with a number of indoor units into a single piping refrigerant network. The system works as a single heat pump system in cooling or heating mode.
1 up to 4 outdoor units can be connected in a single system, with capacities ranging from 14 to 135 kW in cooling mode and 16 to 150 kW in heating mode.
The number of indoor units connected to the same VRF system is up to 48 units of various types and sizes.A selection of 81 different indoor models ensures system flexibility. The total power output of indoor units can exceed up to 135% of the total capacity of outdoor units in the same system.
Adopting the highly efficient new DC twin-rotary compressors and advanced vector controlled inverters the system realizes a COP of 3.3 ~ 4.52 at full load performance and even greater at part load performance with COP ranging from 5.5~6.41 under 50% partial load conditions.
OUTDOOR UNITS
Each outdoor unit shall be factory assembled, consisting of separate compressor and heat exchanger section. Chassis and enclosure shall be made of galvanized sheet steel with electrostatic paint and easily removable service panels.
Outdoor units shall be compact so as to save the footprint and reduce delivery, carry and installation time.
All sizes outdoor units shall have standardized dimensions so as to facilitate base mounting and installation standards.
Each outdoor unit shall be equipped with separate electrical board for power input and automation control with IP65 protection, accessed via removable metal panel. Power supply shall be three phase with neutral and ground connection, at 400 Volts/50Hz (with voltage range 380-415V).
Outdoor unit sound level should not exceed 55dB (A) for a single unit and 62dB (A) when four outdoor units are connected in the same system. All noise data shall be measured at 1m horizontal distance and 1m height from base. Furthermore the system shall be able to auto-switch operation at lower sound level, when demanded by user (in night mode operation or with demand limit control).
Outdoor units shall be able to operate in extended ambient limits with outdoor temperatures from - 5oC to 43oC during operation in cooling mode and from - 20oC to 15oC during heating operation. Since considerable performance decrease shall be expected below -15°C,designer/installer should be carefull about installation location/surroundings and system protection when expected to operate between -15°C and -20°C.
Compressors
All outdoor units with sizes 8, 10 and 12HP shall include two (2) DC twin rotary inverter compressors, while bigger sizes (14 and 16HP) shall be equipped with three (3) high energy DC twin rotary inverter compressors.
All compressors shall be controlled by High-speed Calculation Vector Control Inverter, which produces a smooth sine curve and significantly improves the efficiency of the system. Vector-controlled inverter quickly converts current into a smooth sine curve to achieve smoother operation of the compressor’s DC motor.
With dual-rotation, the load is distributed more evenly — this means that the operating sequence of the outdoor units and the individual compressors are rotated to spread the operating hours more evenly.
Inverter driven compressors eliminate power surges. Over- or under-utilisation of power is eliminated and there is no on/off power surge as the system adjusts to the demand required by the occupant or system.
Infinity variable control adjusts compressor rotation speed in near-seamless 0.1 Hz steps. Responding precisely to the capacity needs of the moment, this fine control minimizes energy loss when changing frequencies, and also creates a comfortable environment subject to minimal temperature variations.
Operating with ultra - precise frequency control and adjusting the compressor’s rotation speed system ensures fully proportional operation, altering performance in operating steps 700 ~ 1200 according to compressor’s size
Each motor employs a compact and powerful magnetic rotor (rare earth magnet) and features reduced eddy-current loss.
Optimization of discharge port positioning in new DC twin-rotary compressor and blade thickness reduces compression loss and friction resistance. Increasing the surface area of the rotor magnets and the addition of slits realize greater efficiency and reduced noise.
The use of inverter compressors reduces the risk of compressor failure, more common in standard non-inverter systems.
The compressors shall have an efficient lubrication system _ Active Oil Control for enhanced reliability, ensuring significantly higher performance and energy savings over conventional scroll compressors, especially at part load performance.
Active Oil Control
The active oil management system shall continually monitor the level of oil in all compressors. Should an oil shortage be detected in any compressor, oil shall be automatically transferred from another compressor or another outdoor unit.
Multiple compressors in an individual outdoor unit shall be connected by way of an oil balancing pipe to ensure a uniform oil levels within the compressors.
1) Oil balance control shall equalize amount of oil between two compressors.
2) Oil supply control shall accumulate oil in the oil separator. If oil is insufficient, the system shall supply oil to the compressors.
3) Oil supply control between outdoor units shall supply oil accumulated in the oil tank of each outdoor unit to the outdoor unit with insufficient oil.
Heat exchangers
Outdoor unit heat exchangers shall be especially designed for high energy transfer, suitable for refrigerant R410A and shall be constructed from aluminum slit fins mechanically expanded onto copper tubes.
The aluminum fins surface will be covered with anticorrosion synthetic layer, which shall ensure corrosion protection and better diffusion of condensate water. Heat exchangers shall have adequate surface to maximize heat transfer, while maintaining low noise levels.
During operation the system determines which heat exchanger can be used most efficiently and selects the compressor to deliver the power required.
At part load performance all interconnected outdoor units, shall share available heat exchanger surface to further increase heat transfer and system part load energy efficiency EER / COP.
Outdoor Unit Fans
Variable-speed fans with an innovative patented fan blade shape ensure improved air distribution at exceptionally low noise levels.Reversed Circular Blades reduce air flow disturbance between the blades, while large size diameter with high performance bell mouth ensure efficient air discharge and even smoother discharge.
The fans are directly powered by high-performance DC inverter motors of 600W with up to 6mm available static pressure for small ducts connection. Fan motors have waterproof casing with continuous lubrication system.
Protection devices
All outdoor units shall be equipped with the following protection devices:
• Discharge and suction temperature sensors
• Internal overload relay
• Compressor over-current relay
• Over-current sensor
• High pressure switch
• Low pressure sensors
INDOOR UNITS
There are 15 different types of indoor units suitable for every use and installation location, such as:
• Four-way ceiling cassette, 10 sizes with cooling capacities from 2,8 kW up to 16kW (MMU-AP0092H ~ MMU-AP0562H)
• Four-way compact ceiling cassette (600X600mm), 5 sizes with cooling capacities from 2,2 kW to 5,6 kW (MMCU-AP0071H ~ MMCU-AP0181H)
• Two-way ceiling cassette, 9 sizes with cooling capacities from 2,2 kW to 14kW (MMU-AP0071WH ~ MMU-AP0481WH)
• One way ceiling cassette, 6 sizes with cooling capacities from 2,2 kW to 7,1 (MMU-AP0071YH ~ MMU-AP0241SH)
• Concealed ducted unit, slim type, 5 sizes with cooling capacities from 2,2 kW to 5,6 (MMD-AP0071SPH ~ MMD-AP0181SPH)
• Concealed ducted unit, standard type 11 sizes with cooling capacities from 2,2 kW to 16kW (MMD-AP0071BH ~ MMD-AP0561BH)
• Concealed ducted unit, High Static type, 7 sizes with cooling capacities from 5,6 kW to 28kW (MMD-AP0151H ~ MMD-AP0961H)
• Horizontal Ceiling unit, 6 sizes with cooling capacities from 4,5 kW to 14kW (MMC-AP0151H ~ MMC-AP0481H)
• High-Wall mounted unit, 6 sizes with cooling capacities from 2,2 kW to 7,1 kW (MMK-AP0071H ~ MMK-AP0241H)
• Floor standing unit Cabinet type, 6 sizes with cooling capacities from 2,2 kW to 7,1 kW (MML-AP0071H ~ MML-AP0241H)
• Floor standing unit concealed type, 6 sizes with cooling capacities from 2,2 kW to 7,1 kW (MML-AP0071BH ~ MML-AP0241BH)
• Floor standing Tall type, 7 sizes with cooling capacities from 4,5 kW to 16kW (MMF-AP0151H ~ MMF-AP0561H)
• Fresh Air intake concealed ducted unit, for up to 100 % fresh air processing, 3 sizes with cooling capacities from 14kW to 28kW (MMD-AP0481HFE ~ MMD-AP0961HFE)
Indoor units electrical supply shall be single-phase with grounding at 230 Volts/50Hz (with voltage range 220-240V).
All indoor units shall be equipped with refrigerant pressure sensor to oversee and inform outdoor units about the actual refrigerant flow. As a result optimal performance for all indoor units shall be ensured, regardless number of operating units, unit’s distance and friction loss.
Indoor units shall include high performance air filters to improve indoor air quality. The air filtration system, shall simultaneously achieve low pressure drop and long operation life.
Heat Exchangers
Indoor unit heat exchangers shall be especially designed for high energy transfer, suitable for refrigerant R410A and shall be constructed from aluminum slit fins mechanically expanded onto copper tubes.
Heat exchangers shall have adequate surface to maximize heat transfer, while maintaining low noise levels.
Electronic expansion valves
Indoor units electronic expansion valves shall be factory- welded to heat exchanger and shall continuously regulate refrigerant flow, depending on internal room cooling/heating load fluctuations, so as to maintain constant comfort with a +/-0,5 oC temperature precision.
Fans
Indoor fans shall be of multiple blades designed for low noise level and shall be static and dynamic balanced in order to prevent any undesirable vibrations and ensure indoor unit’s longevity and high performance.
Optimal refrigerant control
– When a multiple number of indoor units are connected, an insufficient or excess amount of refrigerant may be supplied to indoor units depending on the difference in length of the connection pipe from the outdoor unit.
– This is caused by pressure loss and heat leaks as the refrigerant travels through the pipes, resulting in incorrect amounts of refrigerant being supplied to the indoor units.
– Optimal refrigerant flow control featuring intelligent control over the refrigerant sensors and opening rate of individual pulse motor valves realizes stable indoor temperatures throughout a building with height differences of up to 40m between indoor units.
Refrigerant piping networks
System piping layout can use a maximum equivalent distance between outdoor and indoor units up to 235 meters. Long distance allowances usually facilitate design for floors with many small rooms, or for tenants who often rearrange their floor layouts.
Maximum distance from the 1st branching refrigerant joint to the farthest indoor unit reaches 90m. Total length of piping network can be up to 500m.
When the outdoor unit is higher than indoor units, the maximum height difference can be up to 70m, while when the outdoor unit is lower the maximum height difference can be up to 40m. The maximum height difference between indoor units in the same system can be up to 40m.
Due to pressure sensor existence in all indoor units and due to precise refrigerant flow control, any configuration of the refrigerant joints like Y-type branches and/or header branches can be used in the 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 allowing maximum piping versatility.
Neither sizing increase is required to pipe design (both in liquid and gas line) due to long distance lengths greater than 90m, nor oil traps are required in the refrigerant circuit.
Refrigerant density limit
The room in which the air conditioner is to be installed should be designed or chosen such that in the event of a refrigerant gas leak the density of gas should not exceed a set limit.
The refrigerant R-410A, which is used in the air conditioner product, is intrinsically safe without the toxicity or combustibility of ammonia. R-410A is environmentally friendly and is not restricted by current or pending laws intended to protect the ozone layer.
Risk of suffocation through leakage of R-410A is minimal. However, with the recent increase in the number of high density buildings and use of multi air conditioner systems to ensure effective use of floor space, energy conservation and individual control, installers should ensure it is not possible to exceed density limits in the event of a refrigerant leak. In particular, where a single unit of the multi conditioner system is to be installed into a small room, select a suitable model and installation procedure so that if refrigerant leaks out, density limits are not exceeded. In a room where there is a risk of the density limit being exceeded, create an opening with adjacent rooms, or install mechanical ventilation combined with a gas leak detection device.
Remote, Group & Centralized Controls
The system can be controlled by a series of controls, which shall be connected to indoor units with bipolar wires without polarity, just like indoor units are connected together.
Auto-address system shall automatically set to indoor units the corresponding addresses while detection routine shall check for any faulty connections (Miswiring Check).
Wired and wireless local controls shall be available for all types of indoor units, enabling full and simplified control, depending on application requirements.
Every single local controller shall be able to control up to eight indoor units. Each indoor unit can be controlled by two full local controls. A temperature sensor shall be mounted on local remote controller.
Weekly scheduling shall be available control via dedicated control timer.
Up to 64 units or 64 groups of indoor units could be monitored by central remote controls, into 4 zones of 16. Two central remote controllers can operate in parallel.
Application control systems shall be available either with LCD touch-screen or through a Windows PC in order to control and manage up to 1024 indoor units, enabling full control and system management, time scheduling, energy management (including cost allocation with optional power meter).
Centralized control shall be connectable with integrated building & energy management systems (BMS) via LONWorks and BACnet protocols.