The ABC s of VRF: A Green HVAC Technology An Ideal Green School Solution. Presented by: Fujitsu General America, Inc.

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1 The ABC s of VRF: A Green HVAC Technology An Ideal Green School Solution Presented by: Fujitsu General America, Inc.

2 What to look for in a Green HVAC solution? What if your HVAC system could provide Individual temperature controlled spaces Simultaneous heating and cooling Better comfort to occupants Up to 30% Energy Savings What if you could do all of this with a single system?

3 An investment in a Variable Refrigerant Flow (VRF) System is an investment in your community. VRF is more efficient than conventional systems, providing financial savings to the school for many years. This state-of-the-art technology has the ability to save up to 30% on energy bills. Provides schools with year-round comfort, and can also provide the fresh air necessary for student health and library quiet operation for improved productivity.

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5 VRF is Modular Add outdoor units to meet load. Add capacity as budget allows. Easily install in phases. Scalable from as little as six-tons to hundreds of tons Zoned built in zoning allows you to condition spaces at different temperatures at the same time. Condition only the space you are using at a given time

6 VRF is Centrally Controlled Control all independent temperature zones from a single location in addition to local control. Advanced Scheduled - Maximize your efficiency by applying scheduling based on changing occupancy and use Remotely Monitored Monitor system operation and maintenance remotely Energy Savings Managed - Apply a variety of demand response solutions

7 Healthier Facility VRF systems can be integrated with fresh air systems to ensure that air quality meets the needs of the teachers and students. Central Control Powerful central control can monitor and control individual schools, or an entire college campus, from a single location. Energy Savings Management Available advanced scheduling and remote monitoring provides convenient management of energy savings.

8 Zoning Save energy by only heating or cooling the classrooms that are occupied. Set temperature can be pre-programmed to meet the energy budget for the school district. Comfort VRF helps achieve a healthier, quieter, more comfortable and productive learning environment. VRF HVAC system (as quiet as19 db) creates a much better learning environment for students.

9 Fujitsu Energy Modeling Study Energy Modeling Energy modeling helps building designers, engineers, and other professionals identify a cost effective solution intended to cut annual utility costs. Fujitsu s case study looks at the energy consumption impact of the VRF system relative to three typical base-case HVAC systems: four pipe, water source heat pump (WSHP), and variable air volume (VAV). The study details the building type, location, and materials used in the building construction with the purposes of estimating the building energy usage, HVAC equipment energy consumption, annual operating cost for the building and VRF equipment.

10 Fujitsu Energy Modeling Study The Software The EnergyPro Variable Refrigerant Flow (VRF) Heat Pump computer model is a building energy performance modeling software with a built-in manufacturer s performance data algorithm. EnergyPro calculates the heating and cooling load required to provide comfortable climate environment in the space. The software performs hourly energy analysis and simulates the energy conditions of a building. These simulated conditions are compared to baseline building that is in compliance with Title 24, Part 6 of the California Code of Regulations for building construction or ASHRAE 90.1 standards.

11 Fujitsu Energy Modeling Study Fujitsu s Design & Technical Manual Provides the VRF equipment performance data to determine the VRF system delivered capacity and power consumption, which will vary depending on refrigerant pipe lengths, indoor and outdoor conditions, variable speed compressor, and indoor unit rated capacity relative to the total outdoor unit rated capacity.

12 Fujitsu Energy Modeling Study Energy Modeling - Airstage VRF For the school, a Fujitsu Airstage heat recovery system was used with ceiling mounted air handling units to condition each zone. Each classroom was an individual zone and had its own temperature controller. Eleven refrigerant systems, operating on a single communication network, were modeled. A dedicated outside air unit was provided 26,000 cfm of outside air.

13 Fujitsu Energy Modeling Study Energy Modeling - Four-Pipe The school was modeled using a chiller and boiler serving four-pipe fan coil units. A water-cooled screw chiller with an efficiency of kw/ton was used. The chiller was connected to a two-speed cooling tower with two circulating pumps. A condensing boiler with an efficiency of 91.5% provided hot water for the fan coil units. The outside air was conditioned by the fan coil units. A single fan coil unit was installed in each zone.

14 Fujitsu Energy Modeling Study Energy Modeling - Water Source Heat Pump The school was modeled using water-source heat pumps with a 15.4 EER and a 4.7 COP (Coefficient of Performance). This system was served by a two-speed cooling tower using two pumps to circulate the water. A condensing boiler was attached to the water loop to provide additional heat when necessary. The heat pumps also conditioned the outside air.

15 Fujitsu Energy Modeling Study Energy Modeling - Variable Air Volume (VAV) The school was modeled with a gas-fired hot-water boiler and a packaged VAV system with one rooftop packaged unit with an efficiency of 9.5 EER. The VAV system handled both space conditioning and conditioned the outside air. Each classroom had one VAV box with a hot water reheat coil.

16 Up to 30% Up to 29% Up to 19%

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19 The California Clean Energy Jobs Act (Proposition 39) The California Clean Energy Jobs Act (Prop. 39) changed the corporate income tax code and allocates projected revenue to California's General Fund and the Clean Energy Job Creation Fund for five fiscal years, beginning with fiscal year Under the initiative, roughly up to $550 million annually is available for appropriation by the Legislature for eligible projects to improve energy efficiency and expand clean energy generation in schools. Eligible local educational agencies (LEAs) including county offices of education, school districts, charter schools and state special schools can request funding by submitting an energy expenditure plan application to the California Energy Commission. For the first year, there is an option to receive part or all of a school's allocation for energy savings planning purposes. The Energy Commission approves plans and works with the California Department of Education, which subsequently distributes funds after plans have been approved. The Energy Commission is committed to helping applicants through the process. Tools and resources on this page are designed to help expedite filing an application for approval. New materials and updates will be posted as they are available.

20 Efficiency from careful project Design Our team works to understand building usage Apply correct systems to meet needs

21 Fujitsu Airstage Serving Schools Globally Examples include USA China Australia Poland Oman

22 Pike s County High School Gymnasium, Georgia Flexibility 3 6

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28 Fujitsu General America Inc.

30 What is VRF? VRF Is Commercial Air Conditioning Total Building Comfort Solution Variable Zoning System Refrigerant Complete Controls Solution Efficient Inverter Driven Flow Compressors High partial-load efficiency Easy System Installation All Rights Reserved No photography or reproduction without written consent

31 What is Heat A Recovery System? A Variable Refrigerant Flow System With Simultaneous Heating & Cooling Operation Suitable for buildings where cooling & heating loads coexist 31

33 VRF is The Future of Commercial Heating and Air Conditioning 2013 Fujitsu General 2013 Fujitsu America General Inc. All America Rights Reserved Inc. No photography or reproduction without written consent

34 Global Ductless Market Japan 90% In North America, Ductless is less than 6% of US HVAC Market * China 86% Europe 81% Window Unitary Chillers Moveable Ductless * In 2015, North American VRF sales are expected to exceed $500 million per year. All Rights Reserved No photography or reproduction without written consent 34

36 Energy Efficiency HVAC Consumes 42% Of A Buildings Energy Usage 11% 38% 3% 1% 5% HVAC 42% HVAC User Side Electricity Structure & Insulation Windows Technical Equipment Interior Design Total Energy Use All Rights Reserved No photography or reproduction without written consent 36

37 Building life cycle cost Energy Efficiency Operation cost is 80% of total life cycle cost Life Cycle 80% Greatest Concern for a Building Owner 5% 15% 5% Planning Construction Operation End of life All Rights Reserved No photography or reproduction without written consent 37

38 Green Engineering 2013 Fujitsu General 2011 Fujitsu America General Inc. All America Rights Reserved Inc. No photography or reproduction without written consent 38

40 Energy Savings LEED Modeling Leadership in Energy and Environmental Design VRF can achieve up to 21 points Energy and Atmosphere VRF can achieve up to 7 points Indoor Environmental Quality LEED NC 3.0 Certified: points Silver: points Gold: points Platinum: 80+ points LEED Green Building Rating System The LEED green building certification system is the preeminent program for rating the design, construction and operation of green buildings. All Rights Reserved No photography or reproduction without written consent 40 usgbc.org

41 Airstage Efficiency Highest Average IEER Efficiency Ratings in the Industry Integrated Energy Efficiency Ratio (IEER) IEER Fujitsu D M Ton 8 Ton 10 Ton 12 Ton 14 Ton 16 Ton 18 Ton 20 Ton 22 Ton 24 Ton

42 Airstage Efficiency Highest Average SCHE Efficiency Ratings in the Industry Simultaneous Cooling & Heating Efficiency (SCHE) SCHE Fujitsu D M Ton 8 Ton 10 Ton 12 Ton 14 Ton 16 Ton 18 Ton 20 Ton 22 Ton 24 Ton

43 Outdoor Units Selection & Features

44 Outdoor Units Multiple Refrigeration System Control Offers zoned comfort control based on space load and or tenant space usage. 400 Total Refrigerant Systems The ability to control up to 400 outdoor units for a total capacity of: 3,200 tons Possible Combinations (tons) Capacity

45 Hi-Tech Compressor Operation Logic - Fujitsu created an innovative compressor operation sequence Run command Run command (rotation execute) Lead Lag operation Compressor Rotation Sequence Oil recovery command Note: Fujitsu Airstage factory training provides complete details on system operation and function. Stop command (rotation execute) Stop command 1 Provides equal compressor duty 2 Results in high system durability

46 The Compressor Single Twin Rotary Compressor Competition uses scroll compressors Some competitors use multiple compressors One variable and one fixed Makes condenser more expensive Using older design technology Equipment weighs more Compressor weight Oil separators, additional piping Twin rotary more efficient than scroll Up to 7% Better COP

47 The Compressor Improved rotary comp. efficiency 7% (against scroll compressor) Over compression loss at part load operation (For scroll compressor) Under compression loss at high load operation (For scroll compressor)

48 The Condenser Unique 4-Face Condenser Coil Design Increased Air Intake Higher Capacity Coil Front air flow capability Allows units to be spaced closer together Increased heat transfer capacity 5% AIR INTAKE

49 Hi-Tech Refrigeration Cycle Protection Refrigeration Cycle is highly protected under all circumstances Outdoor Unit CS INV Unit CTS DTS INV ACM HPSw HPS STS ACM (20L) LPS HEX SCHEX 1. High & Low Pressures Protection High Pressure Sensor (HPS) High Pressure Switch (HPSw) Low Pressure Sensor (LPS) 2. High Temperature Protection Discharge Temperature Sensor (DTS) Compressor Temperature Sensor (CTS) 3. Overload Protection Current Sensor (CS) for Inverter Compressor Results in: High Cycle Reliability

50 Indoor Units

51 Type Capacity Compact Cassette Indoor units A wide variety of Indoor units helps for better system design ( 9 Types, 33 Models, Capacity range from 7.5kBtu/h to 60kBtu/h) Cassette Duct Floor Ceiling Cassette Slim Duct Medium static pressure High static pressure Floor Slim Concealed Floor Ceiling Wall Mounted Wall Mounted (kbtu/h)

52 Similar Indoor Unit Line-up Slim Duct (Two Sizes) ( One size) (One Size) Model : 7.5 / 9.5 / 12 / 14 / 18 Floor / Ceiling (One Size) Model: 24 / 30 / 36 Ceiling (One Size) Model : 36 / 48 / 60 Wall Mounted (Two Sizes) Model : 12 / 14 / 18 / 24 Ceiling Cassette (One Size) Model : 30 / 36 (One Size) Model : 18 / 24 Model: 7.5 / 9.5 / 12 / 14 Model: 7.5 / 9.5 / 12 / 14 / 18 / 24 Model : 18 / 24 / 30 / Fujitsu General America 2013 Fujitsu Inc. All General Rights America Reserved Inc. No photography or reproduction without written consent

53 Installation Flexibility 2013 Fujitsu General 2013 Fujitsu America General Inc. All America Rights Reserved Inc. No photography or reproduction without written consent

54 Why a VRF System? Installation Advantages VRF systems are light weight & modular. Easily transported by elevator. Design Flexibility A single condensing unit can be connected to many indoor units of varying capacity & configuration Ease of Commissioning It is nearly plug-and-play by design. Comfort Many zones are possible, each with individual set point control Energy Efficiency Inverter variable speed compressor provides system capacity modulation based on the demand from individual zones providing high part-load efficiency. Fits In A Small Elevator DC Sine Wave Variable Speed DC Inverter Compressor All Rights Reserved No photography or reproduction without written consent

55 HR Outdoor Unit Line up Two different size outdoor units are used to create 3 base capacity systems. 66-9/16 (1690) 66-9/16 (1690) 6Ton : AOUA72*LBV 8Ton : AOUA96*LBV 10Ton : AOUA120*LBV All Rights Reserved No photography or reproduction without written consent 55

57 System Design Considerations VRF System Design Refrigerant has highest heat transfer capability Chiller System Design Lower heat transfer capability All Rights Reserved No photography or reproduction without written consent

58 System Design Considerations VRF System Design Refrigerant has highest heat transfer capability Chiller System Design Lower heat transfer capability VAV (Variable Air Volume) System Design Very low heat transfer capability All Rights Reserved No photography or reproduction without written consent

60 VRF Benefits What does it take to deliver 20 tons of Cooling? 30 Inch Supply Duct & Return 2 ½ Inch Pipe 1-1/8 Inch Pipe Advantage Air Chilled Water All Rights Reserved No photography or reproduction without written consent

61 VRF Benefits Heat Transfer Capability Comparison 30 Inch Supply Duct & Return 2 ½ Inch Pipe 1-1/8 Inch Pipe VRF Advantage Air Chilled Water 25 Watts / lb. Heat Transfer Capability 0.14 Watts / lb. 2.6 Watts / lb. All Rights Reserved No photography or reproduction without written consent

62 High Static Outdoor Fan - Allows outdoor units to be installed in balcony of high rise building FGL D M.322 in.wg (80Pa) in.wg (78.4Pa) in.wg (60Pa) Possible to Connect longer discharge duct Duct Outdoor Unit All Rights Reserved No photography or reproduction without written consent

64 Quiet Operation 2013 Fujitsu General 2013 Fujitsu America General Inc. All America Rights Reserved Inc. No photography or reproduction without written consent

65 Compare Ductless Sound Levels Indoor Unit Ducted Unit Quiet Operation Residential Outdoor Unit Commercial Outdoor Unit Preliminary As low as 19 db(a) As low as 23 db(a) As low as 46 db(a) As high as 57 db(a) As low as 61 db(a) Quiet db(a) Recording Studio 33 db(a) Library 40 db(a) Quiet Home 50 db(a) Refrigerator 60 db(a) 70 db(a) Conversation Busy Traffic db(a) db(a) 78 db(a) Vacuum db(a) 90 db(a) Motorcycle Loud db(a) Hand Drill PTAC Unit Residential 3-ton Unit Air-Cooled Chiller How LOUD Is A Traditional HVAC Unit? All Rights Reserved No photography or reproduction without written consent

70 Heat Recovery Fundamentals 2013 Fujitsu General 2013 Fujitsu America General Inc. All America Rights Reserved Inc. No photography or reproduction without written consent

71 System Piping Known as a 3 pipe system Liquid Cool Vapor Hot Gas Cold Vapor or Hot Gas Changes EEV Internal

72 System Piping Known as a 3 pipe system Liquid Cool Vapor Hot Gas Cold Vapor or Hot Gas Changes EEV Internal 3 pipes from OD unit to RBU* 2 pipes from RBU to Indoor Unit Flow changes based on solenoid valves in RBU Boxes - Not Reversing Valve *Liquid line bypasses small RBU units (saving 2 connections)

73 Refrigerant Branch Units The ability of a Heat Recovery System to operate in both heating and cooling at the same time, requires switching of the hot gas and the cold liquid. This work is done by the Refrigerant Branch Unit (RBU) All Rights Reserved No photography or reproduction without written consent

74 Installation Freedom Control box can be repositioned on the top of single RBU unit FGL Only Control box Installation Example For single type RB Unit ONLY 74

75 Installation Limitations Fujitsu Fujitsu General General America America Inc. Inc.

76 Heat Pump Piping Installation Flexibility Long Pipe length Overall Total pipe length 3,280 Ft. max. Refrigerant System Pipe Length, Outdoor Unit to furthest indoor unit Heat Pump: 492 ft. max. Heat Recovery: 541 ft. max Height difference between outdoor and indoor units *164 Ft. max. Pipe lengths from first separation tube to the farthest indoor unit 196 Ft. max. Height difference between indoor Units Maximum 49 Ft. *When outdoor unit is lower than indoor, maximum height difference is reduced to 131 feet All Rights Reserved No photography or reproduction without written consent

77 Transmission Wiring Design Both parallel & serial wiring are possible Wiring length up to 11,811ft (3,600m) max. :Transmission Line Parallel connection Serial connection Note: Serial Connection - MANUAL ADDRESSING ONLY - (can t use automatic address setting in a multiple refrigerant system) Serial connection saves Wiring cost and Installation time All Rights Reserved No photography or reproduction without written consent

79 Various combinations 1 Installation Flexibility Preliminary Capacities from 6 to 24 Tons in one refrigeration system. Connectable indoor unit capacity Up to 130% Number of connectible indoor units up to 45 units Wide variety of indoor units 9 Styles, 33 Indoor units Note : when indoor unit connected capacity is greater than 100%, individual indoor units will operate at a lower capacity when more capacity is required. All Rights Reserved No photography or reproduction without written consent

80 Various combinations 1a Installation Flexibility Preliminary Capacities from 6 to 24 Tons in one refrigeration system. Connectable indoor unit capacity Up to 130% Number of connectible indoor units up to 45 units Wide variety of of indoor units Wide variety of indoor units 9 Styles, 33 Indoor units Styles, 33 Indoor units Note : when indoor unit connected capacity is greater than 100%, individual indoor units will operate at a lower capacity when more capacity is required. All Rights Reserved No photography or reproduction without written consent

81 Various combinations Installation Flexibility Preliminary Capacities from 6 to 24 Tons in one refrigeration system. Connectable indoor unit capacity Up to 130% Number of connectible indoor units up to 45 units Maximum on each refrigerant system Wide variety of of indoor units Wide variety of indoor units 9 Styles, 33 Indoor units Styles, 33 Indoor units Note : when indoor unit connected capacity is greater than 100%, individual indoor units will operate at a lower capacity when more capacity is required. All Rights Reserved No photography or reproduction without written consent

82 Heat Pump Connectable Capacity Various combinations Heat Pump Capacities from 6 to 24 Tons in one refrigeration system. Connectable indoor unit capacity Up to 130% Number of connectible indoor units up to 45 units Maximum on each refrigerant system Wide variety of of indoor units Wide variety of indoor units 9 Styles, 33 Indoor units Styles, 33 Indoor units Note : when indoor unit connected capacity is greater than 100%, individual indoor units will operate at a lower capacity when more capacity is required. All Rights Reserved No photography or reproduction without written consent

83 Heat Recovery Connectable Capacity Various combinations Heat Recovery Capacities from 6 to 24 Tons in one refrigeration system. Connectable indoor unit capacity Up to 150% Number of connectible indoor units up to 45 units Maximum on each refrigerant system Wide variety of of indoor units Wide variety of indoor units 9 Styles, 33 Indoor units Styles, 33 Indoor units Note : when indoor unit connected capacity is greater than 100%, individual indoor units will operate at a lower capacity when more capacity is required. All Rights Reserved No photography or reproduction without written consent

84 Heat Pump Temperature Operation Range Installation in a wide range of design temperature conditions. 120 Cooling Preliminary F 5 F* 5 F* range Operation possible in cooling Heating 70 F -4 F -4 F range Operation possible in heating F = FDB *Units combined in one refrigeration system changes low temperature operation range to 23 f All Rights Reserved No photography or reproduction without written consent

85 Heat Recovery Temperature Operation Range - Allows use in a wide temperature range from -4 F heating to 115 F cooling ( ) ( F) (Cooling) 115 F (46 ) (Cooling & Heating) 70 F (21 ) (Heating) 70 F (21 ) F (-10 ) 14 F (-10 ) -4 F (-20 ) All Rights Reserved No photography or reproduction without written consent

86 Controls 2013 Fujitsu General 2013 Fujitsu America General Inc. All America Rights Reserved Inc. No photography or reproduction without written consent

87 A wide range of individual and group system controls Controls Touch Screen Remote Controls Simple Wired Remotes Touch Panel Controller Central Remote Control Wireless Remote Controls Wired Remote Controls External Switch Controller All Rights Reserved No photography or reproduction without written consent System Controller Lite System Controller Web Monitoring Service Tool BACnet Gateway Network Converter Signal Amplifier LonWorks Converter

88 Controls Line up Same control line up as V-II + New Touch Screen and System Controller Lite INDIVIDUAL CONTROL CENTRAL CONTROL CONTROLL ER WIRELESS RC SIMPLE RC 3-WIRE WIRED RC 2-WIRE Touch Panel NEW CENTRAL RC TOUCH PANEL CONTROLLER SYSTEM CONTROLLER LITE Remote access / Electricity charge apportionment / Energy saving option NEW SYSTEM CONTROLLER Energy Manager Option PC field supplied PC field supplied Max. controllable RC group Max. controllable Indoor Units All Rights Reserved No photography or reproduction without written consent

89 System Controller Central Control Touch panel controller Controllable Systems: 1600 Indoor Units 400 Outdoor Units Controllable Systems: 400 Indoor Units 100 Outdoor Units Central Remote Controller Controllable Systems: 100 Indoor Units 100 Outdoor Units Individual Control Options: Simple Wireless Wired Multiple remote capable All Rights Reserved No photography or reproduction without written consent

90 Individual Wired RC (Touch Panel) Presentation Contents: User Friendly Design Energy Saving Function Convenient Function Individual Wired Remote Controller UTY-RNRU (Non Polar 2-wire) Simplified Installation Easy Maintenance Function Compatibility Restriction All Rights Reserved No photography or reproduction without written consent 90

91 User Friendly Control System Touch Panel Controller Installer setting Flexible grouping Preliminary Schedule control Password setting All Rights Reserved No photography or reproduction without written consent

92 System Controller Monitor Mode (Site) User friendly Controls Preliminary Electrical Utility Billing Calculation Monitor mode (Building) System Scheduling System Monitoring (List) 3D View Exclusive To Fujitsu! All Rights Reserved No photography or reproduction without written consent

93 System Controller User Friendly Controls By using client software, one PC can perform central control and web control of 10 VRF system sites with max. 20 buildings per site. Max. controllable 4 VRF system Max. controllable 400 outdoor units Max. controllable 1,600 indoor units On site control Remote central control Max. 4 network system per site Controlled sites of up to 10 Server Server 11,811 ft. Server Server All Rights Reserved No photography or reproduction without written consent

94 Operation, Control and Service Off Site & Onsite Web Monitoring Tool UTY-AMGX Service Tool UTY-ASGX On Site Monitoring site VRF system site VRF system site Remote monitoring Monitoring via Web Browser + VRF system building Monitoring at VRF system site VRF system building USB connection anywhere in system System set-up, Commisioning and Service on site Building System Control and Operation All Rights Reserved No photography or reproduction without written consent

96 Control System & Integration Examples Touch Panel Controller Central Remote Controller System Controller Remote Monitoring Meeting Room Break Room Hotel Room Lighting SW Ventilator Human Sensor Ventilator Card Key Window Fire Sensor All Rights Reserved No photography or reproduction without written consent

97 Control Integration w/ Building Management Central Remote Controller Group C Group D Group B Group A Network Convertor Single Connection with the VRF V-Ⅱ System Max. controllable 100 indoor units Max.16 groups controlled : Lon network : External Input / Output : Module Link : Remote controller cable All Rights Reserved No photography or reproduction without written consent

98 Electric Metering Capable Option of metering electrical usage Managing system output based on usage for peak energy savings. And More! All Rights Reserved No photography or reproduction without written consent

100 2013 Fujitsu General America 2013 Fujitsu Inc. All General Rights America Reserved Inc. No photography or reproduction without written consent Design Simulator Software Easy Equipment Selection Complete Selection Output Reliable Project Management Design Simulator Simplifies the design process to ensure a successful installation.

103 System using Economizer input function - Example 1 :This function provides the efficient and the energy-saving air conditioning by using Economizer and VRF system. Information from the remote controller ( Occupied / Unoccupied) Information from the remote controller ( Occupied / Unoccupied) Cooling operation: On information is sent Cooling capacity: High/Low Information is sent All Rights Reserved No photography or reproduction without written consent 103

105 Summary 2011 Fujitsu General America Inc. Fujitsu AirStage VRF Provides 1. Simple Space Saving Installations 2. Very High Energy Efficiencies 3. LEED Points For Green Jobs 4. Cost Effective Alternative 5. A Wide Range Of Energy Management Options 6. System Wide Diagnostic Capabilities 7. Complete Controls Solutions 8. Comfortable And Quiet Building Spaces 105

106 Thank You 2011 Fujitsu General America Inc. Let Fujitsu Airstage VRF products be the Key to your Green School!