CEILAiR. Engineering Manual. Precision Air Conditioning 1 to 10 Tons (60 Hz Data) Ceiling Mounted Full line of DX & CW Systems

Transcription

1 CEILAiR Engineering Manual Precision Air Conditioning 1 to 10 Tons (60 Hz Data) Ceiling Mounted Full line of DX & CW Systems

2 Stulz SATS is dedicated to providing innovative solutions for critical temperature and humidity control needs. SATS designs and manufactures specialized environmental control equipment for commercial, industrial and custom military applications. SATS serves a diverse marketplace - including telecommunications, information technology, medical, financial, educational, industrial process and government contracts - utilizing world-class island manufacturing processes in a modern, 150,000 ft 2 Air Technology Systems, Inc facility. The addition of SATS to the STULZ family of companies solidifies STULZ as a global leader in the precision air conditioning marketplace. SATS combines a global network of sales and service companies with an extensive factory engineering staff and highly flexible manufacturing resources dedicated to providing world-class quality, innovation and customer service. ISO-9001:2001Quality Registered Stulz-ATS is committed to satisfying customer expectations by meeting and exceeding requirements. Our Quality Policy ensures that every Employee is committed to Customer Satisfaction, Teamwork and utilizing Continuous Process Improvement methods in order to deliver an exceptional product. We will continually measure our performance to improve the effectiveness of our quality management system Precision A/C Applications Stulz-ATS is dedicated to the manufacturing of supplemental and precision air conditioning products. With an extensive installation base, SATS has earned a solid reputation as a quality supplier and leader in its field. CeilAiR ceiling mounted air conditioning units provide temperature and/or humidity control for those hot spot areas in the building which exceed the central system capacity. They are an economical solution to such demands which may, in fact, be temporary until the next offices are carved out of an existing plant area, another laboratory added to a school or new medical equipment installed at a hospital. No floor space is required by the CeilAiR ceiling mounted units. The units are designed with a wide range of options to handle both comfort and precision cooling applications. Typical applications include: COMFORT Conference Rooms General Office Spaces Modular Offices CRITICAL / PRECISION Telecommunications Rooms Telephone Switch-Gear Rooms Computer / LAN Rooms Copier / Fax Rooms ATM Bank Centers Elevator Equipment Rooms CAT SCAN / MRI Facilities Hospital Operating & Isolation Rooms Clean Rooms Laboratories PERFECT FOR TENANT RENOVATIONS! 1-1

3 Table of Contents Table of Contents SECTION - 1 Introduction to Stulz-ATS Table of Contents SECTION - 5 ELECTRICAL DATA: (FLA / MCA / MFS) Electrical Data Index SECTION - 2 CeilAiR SYSTEMS: Outstanding Advantages User Oriented Features & Options Available Configurations /4 MODEL NOMENCLATURE: Nomenclature Chart Model Nomenclature Specifications SECTION - 3 GUIDE SPECIFICATIONS: Standard Features Index Standard Guide Specifications /4 DX - Compressorized Systems: Air Cooled, Self-Contained Systems Air Cooled, Split Systems /4 Water Cooled Systems /4 Glycol Cooled Systems /4 DX - Air Handling & Remote Condensing Units: DX - Air Handling Units /6 Free-Cooling & Alternate Water Source: DX with Free-Cooling /8 DX with Alternate Water Source /8 Chilled Water Air Handling Systems: Optional Features Index Optional Features Guide Specifications /14 Chilled Water Systems SECTION - 4 PERFORMANCE / CAPACITY SPECIFICATIONS: Performance Data Index SECTION - 6 DIMENSIONAL / INSTALLATION DRAWINGS: Dimensional Drawing "Quick Find" Index DX - Air Cooled Systems /6 DX - Water Cooled Systems /8 DX - Glycol Cooled Systems /10 Chilled Water Systems /16 Physical Data - Unit Weights (lbs) Connection Sizes - DX Refrigerant Air Cooled Systems /9 Water / Glycol Cooled Systems /13 Chilled Water Systems /15 Free-Cooling & Alternate Water Source Systems /28 1-2

4 CeilAiR Systems CeilAiR ceiling A/C's are designed as the ultimate space saver. They easily mount in a standard 2' x 4' grid of a dropped ceiling plenum and are available with high static blowers (up to 2.0" e.s.p. available) for connection to ceiling plenum ducts. CeilAiR units are especially useful where there is no floor or wall space available for cooling units or where aesthetics demand out-of-sight installation. { CeilAiR Systems Offer Outstanding Advantages Flexibility A wide variety of types are available to meet your unique requirements. DX - Air Cooled DX - Water Cooled DX - Glycol Cooled (w/ Remote Drycoolers & Pump Packages Technology Systems, Inc DX - Air Handling Units Chilled Water Air Handling Units Microprocessor Controls Precision temperature and/or humidity control with unrivaled, user-friendly controls, offer a wide range of functions and alarms. Versatility Spot Cooling & Ducted systems Self-Contained & Split systems Space Saving Design Compact, in-the-ceiling design saves valuable floor space. Wide Size Range 1 to 10 tons capacity in eleven incremental sizes meets any supplemental cooling requirement. Non-Proprietary Parts All CeilAiR systems incorporate non-proprietary components where possible. Most major HVAC, refrigeration and electrical distributors stock an exact model cross reference or an alternate to most factory provided components. A-Tech-1.1/.2 C-Tech-10 A-Tech-20 Complete Temperature & Humidity Control Steam Canister Humidification (Optional) Dehumidification Mode (Optional) with - Electric Reheat/Heat - Hot Gas Reheat (Energy $aver) - Hot Water & Steam Reheat/Heat Capacity Modulation Options Single & Dual Compressor Systems Hot Gas Bypass Systems Multistage Reheat/Heat Code Conformance NRTL LISTED C Listing E R Complies With UL 1995 CSA C22.2 No. 236 Heating & Cooling Equipment - NYC MEA Approved (MEA E) - Chicago Code Approved - MET-C recognized by Standards Council of Canada 2-1

5 User Oriented Features & Options Scroll Compressors CeilAiR DX air conditioners incorporate Scroll Compressor Technology (unless specified otherwise). Scroll Compressors provide higher efficiency, higher reliability and lower sound power than other compressor technologies. Variety of Air Patterns Spot Cooler Year Round Operation Option offerings available with Ceil- AiR air conditioners allow for year-round, 24/7 continuous on-line system operation in any environment in the world: Ducted EVAPORATOR AIR IN EVAPORATOR AIR OUT Low Ambient Control (DX - Air Cooled) 0 F Fan Cycling / Fan Speed -20 F Variable Fan Speed -30 F Flooded Head Pressure EVAPORATOR AIR IN EVAPORATOR AIR IN Quiet Operation Low sound power Scroll compressors coupled with low RPM blowers, acoustically lined cabinets and low velocity grilles provide the optimum in quiet operation. EVAPORATOR AIR OUT 90 / Right-Angle EVAPORATOR AIR OUT Straight-Thru Fast Delivery Stock units complete and ready for shipment "Rapid-Fire", 5 day Ship Program Warranty - 2 Year Parts Standard - Optional 5 Year Compressor Other Available Options - Condensate Pumps - Electrical Service Switches - Firestats - Smoke Detectors - Water Leak Detectors - Special High Efficiency Filtration (2" & 4" Filters up-to 60% Dust Spot) - High Pressure DX - Water/Glycol Cooled Condenser Regulating Valves - Free-Cooling & Alternate Water Source Units - Many more options available (see page 3-5)! Light weight ALL ALUMINUM cabinet and chassis prevents rust & corrosion CeilAiR Ceiling AC Systems (Model OHS-( )-AS Shown) Selected Standard Features: Acoustical / Thermal Insulation Aluminum Fin / Copper Tube Coils Thermal Expansion Valve Refrigerant Sight Glass Filter / Drier Strainer Liquid Refrigerant Reclaim Valves Insulated SS or Polymer Drain Pans Condensate Overflow Safety Switch High / Low Pressure Switches 2-2

6 Space Saving Configuration Choices AIR COOLED SYSTEMS SELF-CONTAINED AIR COOLED - with INTEGRAL Air Cooled Condenser OHS-012/040-AS (Self-Contained, "Ductless" Spot Cooler) OHS-012/040-AS (Self-Contained, Ducted Evaporator) SPLIT AIR COOLED - Please refer to the SATS Heat Rejection Engineering Manual for specification and performance data on SATS Remote Condensers & Condensing Units { with REMOTE OUTDOOR or INDOOR Air Cooled Condenser (compressor located with Evaporator Section) SATS Remote Outdoor Propeller Condenser { SATS Remote Outdoor Propeller Condenser SATS Remote Indoor Centrifugal Condenser OHS-012/040-AR (Split Evaporator, "Ductless" Spot Cooler) SATS Remote Indoor Centrifugal Condenser OHS-012/040-HAR & OHS-048/060-AR (Single Compressor - Split Evaporator) (Ducted Only) SATS Remote Outdoor Propeller Condenser Air Technology Systems, Inc { { SATS Remote Outdoor Propeller Condenser SATS Remote Indoor Centrifugal Condenser OHS-012/032-AR (Split Evaporator, Ducted Evaporator) OHS-040/120-(D)AR (Dual Compressors - Split Evaporator) (Ducted Only) SATS Remote Indoor Centrifugal Condenser SPLIT AIR COOLED - AIR HANDLING UNIT w/ INDOOR or OUTDOOR REMOTE CONDENSING UNIT (compressor located with Condensing Section) SATS Outdoor Propeller Remote Condensing Unit SATS Outdoor Propeller Remote Condensing Unit { { SATS Indoor Centrifugal Remote Condensing Unit OHS-012/040-AHU (Split, DX - Air Handling Unit) ("Ductless" Spot Cooler) SATS Indoor Centrifugal Remote Condensing Unit OHS-048/060-AHU (Split, DX - Air Handling Unit) (Ducted Only) SATS Outdoor Propeller Remote Condensing Unit SATS Outdoor Propeller Remote Condensing Unit OHS-048/120-DAHU (Dual Circuit, Split, DX - Air Handling Unit) (Ducted Only) { { SATS Indoor Centrifugal Remote Condensing Unit OHS-012/040-AHU & HAHU (Split, DX - Air Handling Unit) (Ducted Evaporator) SATS Indoor Centrifugal Remote Condensing Unit 2-3

7 More Space Saving Configuration Choices WATER COOLED SYSTEMS SELF-CONTAINED WATER COOLED SYSTEMS Remote Water Source (supplied by others) Remote Water Source (supplied by others) OHS-012/040-W (Self-Contained, "Ductless" Spot Cooler) OHS-012/032-W (Self-Contained, Ducted Evaporator) Remote Water Source (supplied by others) Remote Water Source (supplied by others) OHS-012/040-HW & OHS-048/060-W (Single Compressor, Self-Contained, Ducted Only) OHS-048/120-DW (Dual Compressors, Self-Contained, Ducted Only) SELF-CONTAINED GLYCOL COOLED SYSTEMS GLYCOL COOLED SYSTEMS Please refer to the SATS Glycol Systems Engineering Manual for specification and performance data on SATS Glycol Pump Packages and Drycoolers OHS-012/040-G with SATS DRYCOOLER & PUMP PACKAGE (Self-Contained, "Ductless" Spot Cooler with Outdoor Propeller Drycooler & Pump Package) OHS-012/040-HG & OHS-048/060-G with SATS DRYCOOLER & PUMP PACKAGE (Single Compressor, Self-Contained, Ducted Only with Outdoor Propeller Drycooler & Pump Package) OHS-012/040-G with SATS DRYCOOLER & PUMP PACKAGE (Self-Contained, Ducted Evaporator with Outdoor Propeller Drycooler & Pump Package) OHS-048/120-DG with SATS DRYCOOLER & PUMP PACKAGE (Dual Compressors, Self-Contained, Ducted Only with Outdoor Propeller Drycooler & Pump Package) Remote Liquid Chiller (supplied by others) CHILLED WATER SYSTEMS Remote Liquid Chiller (supplied by others) Remote Liquid Chiller (supplied by others) OHS-012/040-C (Self-Contained Air Handler) ("Ductless" Spot Cooler Evaporator) OHS-012/040-C (Self-Contained Air Handler) (Ducted Evaporator) OHS-048/120-C (Self-Contained Air Handler) (Ducted Only) 2-4

8 Nomenclature - CeilAiR Systems Model Nomenclature - "OHS" Systems CeilAiR - Ceiling Mounted A/C's OHS = OverHead System COS = CyberONE System MCS = Modular Cyber System VFS = Vertical Floor System FCS = Floor Console System SCS = STULZ Condensing Section* GPS = Glycol Pump System* Nominal Capacity in 1,000's of BTU/H OHS-040-G-FC AHU = Air Handling Unit AR = Remote (Split) Air Cooled AS = Self-Contained Air Cooled C = Chilled Water System CAA = Indoor Centrifugal Condenser* D( ) = Dual (Two) Circuit System G = Glycol Cooled H( ) = Horizontal Discharge, "H- Series" Configuration (e.g.: HAHU, HAR, HW, HG, & HC) ( )AA = Outdoor Prop Fan Condenser for 0 F* Air Technology ( )SA Systems, = Outdoor Prop Fan Condenser for -20 F* Inc ( )AA = Outdoor Prop Fan Condenser for -30 F* AWS FC LP OA SF SP = "Alternate Water Source" = "Free-Cooling" = "Low Profile Configuration" = "Outside Air"* = "Same-Face" Air Pattern = "Special Configuration" EC = Outdoor Prop Fan Condenser for -20 F* w/ EC Fans RCU-I = Indoor Centrifugal Remote Condensing Unit* RCU-O = Outdoor Remote Condensing Unit* W = Water Cooled * SATS Condensers & Condensing Units can be found in our "Heat Rejection" engineering manual. * SATS OHS Oustide Air Units can be found in our "CeilAiR Outide Air" engineering manual. * SATS Pump Packages and Drycoolers can be found in our "Glycol Systems" engineering manual. 2-5

9 Model Nomenclature Specifications "CeilAiR" Model Nomenclature Guide Specifications AIR COOLED SELF-CONTAINED Integral Self-Contained (Models OHS-012/040-AS) The system shall be a self-contained, ceiling mounted supplemental air conditioner with factory mounted integral air cooled condenser with centrifugal blower. The condenser shall be sized to provide the total heat of rejection of the system at a 95 F DB ambient temperature. The system shall require only single point supply power connection and the system shall ship from the SATS factory with a full operating refrigerant charge. DX - EVAPORATOR SECTIONS Air Cooled Remote Evaporator (Models OHS-( )-()AR) The system shall be a remote (split) air cooled, ceiling mounted supplemental air conditioner evaporator. The evaporator section shall house, as a minimum, the evaporator coil, expansion valve, compressor, evaporator blower/motor and associated electrical and refrigeration components. The OHS-( )-()AR evaporator section shall be located at some distance from its corresponding CeilAiR model HES-( )-()CAA indoor or WCS-( ) outdoor air cooled condenser. The evaporator system shall require only single point main power supply connection and the ystem shall ship from the SATS factory with a dry nitrogen holding charge ready for field refrigerant (R-22) charging. (Note: SATS Condensers & Condensing Units can be found in our "Heat Rejection" engineering manual.) DX - WATER COOLED SYSTEMS Integral Self-Contained (Models OHS-( )-W / DW) The system shall be a self-contained, ceiling mounted supplemental air conditioner to include integral water cooled, coaxial condenser with factory installed head pressure water regulating control valve(s). Condenser (source) water shall be provided by a cooling tower or some other remote water source. The system shall require only single point supply power connection and shall ship from the SATS factory with a full operating refrigerant charge. Water Regulating Valves: Head pressure shall be automatically controlled by a factory installed 2-way water regulating valve rated for 150 psig w.w.p. (Note: 3-way and high pressure 300 to 400 psig rated valves are available as options, page 3-9.) DX - GLYCOL COOLED SYSTEMS Integral Self-Contained (Models OHS-( )-G / DG) The system shall be a self-contained, ceiling mounted supplemental air conditioner to include integral glycol cooled, coaxial condenser with factory installed head pressure glycol regulating control valve(s). Condenser (source) glycol solution shall be provided via a CeilAiR model GPS-( )-( ) / HES-( )-LGA remote glycol pump package and drycooler system. The system shall require only single point supply power connection and shall ship from the SATS factory with a full operating refrigerant charge. Glycol Regulating Valves: Head pressure shall be automatically controlled by a factory installed 2-way glycol regulating valve rated for 150 psig w.w.p. (Note: 3-way and high pressure 300 to 450 psig rated valves are available as options, page 3-9.) CHILLED WATER AIR HANDLERS CHILLED WATER SYSTEM (Models OHS-( )-C) The system shall be a ceiling mounted chilled water supplemental air conditioner to include chilled water cooling coil, evaporator blower and motor and chilled water control valve. Chilled water shall be provided by a remote liquid chiller system. Chilled Water Control Valve: Cooling capacity shall be controlled with a slowly opening and slowly closing 2-way motorized control valve rated for 300 psig w.w.p. (Note: 3-way 300 psig motorized valves and 2 or 3-way modulating valves are available as options.) Nomenclature - CeilAiR Systems 2-6

10 Guide Spec's - Standard Features "Quick-Reference" Table Selected Standard Features - "OHS" Series "OHS" Model 012/040-( ) 012/040-H( ) 048/060-( ) 048/120-D( ) SELECTED STANDARD FEATURES: TEMPERATURE CONTROL Cooling Only Std Std Std Std Heating / Reheating Control Opt Opt Opt Opt HUMIDITY CONTROL Electrode Canister Steam Humidifier Opt Opt Opt Opt Dehumidification Mode with Reheat Opt Opt Opt Opt CONTROLS A-Tech-1.1 single stage controls Std Std Std N/A A-Tech-1.2 two stage controls Opt Opt Opt Std C-Tech-10, A-Tech-20, C6000 T/H Microprocessor Controls Opt Opt Opt Opt CABINET All Aluminum Construction Std Std Std Std Insulated SS or Polymer Condensate Drain Pan Std Std Std Std 1/2", 2 lb Density Thermal & Sound Insulation Std Std Std Std Rubber Hanging Vibration Isolators Std Std Std Std FILTERS / GRILLES Spot Coolers with bottom supply / return filter grille Std N/A N/A N/A Ducted Units with flanged ducted connections Opt Std Std Std DX-REFRIGERATION CIRCUIT R22 Refrigerant Std Std Std Std R407C Refrigerant Opt Opt Opt Opt Scroll Type Compressor(s), (unless otherwise noted) Std Std Std Std High Efficiency, Aluminum Fin / Copper Tube Coils Std Std Std Std Thermal Expansion Valve Std Std Std Std Refrigerant Sight Glass & Filter/Drier Strainer Std Std Std Std Refrigerant Service Valves Std Std Std Std Air Technology Systems, Inc BLOWERS / MOTORS Direct-Drive Evaporator Motors Std N/A N/A N/A Belt-Drive Evaporator Motors N/A Std Std Std ELECTRICAL Power Supply See Electrical Tables Section Multi-Voltage Control Transformer (24V Class II) Std Std Std Std Individual Motor Starter(s) / Contactor(s) Std Std Std Std SAFETY FEATURES Condensate Pan Overflow Safety Switch(es) Std Std Std Std High / Low Refrigerant Pressure Switches (DX units) Std Std Std Std Motor Overcurrent and Overload Protection Per UL 1995 Std Std Std Std SPECIFIC MODEL STANDARD FEATURES: AIR COOLED Low Ambient Head Pressure Control Three types available 0 F, -20 F or -30 F Integral (model OHS-()-AS) or Remote Air Cooled Condenser Std Std Std Std WATER / GLYCOL COOLED 2-way, 150 psig Water/Glycol Regulating Valves Std Std Std Std High Pressure & 3-way Valves Opt Opt Opt Opt Coaxial, Tube-in-Tube Heat Exchanger Std Std Std Std ALL SPLIT DX SYSTEMS Liquid Line Solenoid Valve to Prevent Liquid Slugging Std Std Std Std DUAL CIRCUIT DX SYSTEMS Two(2) Independent Refrigerant Circuits N/A N/A N/A Std Two(2) Equal Horsepower Scroll Compressors (1 per circuit) N/A N/A N/A Std A-Tech-1.2 two stage controls N/A N/A N/A Std CHILLED WATER SYSTEMS 2-way, 300 psig Motorized Valve Std Std Std Std Modulating, High Pressure & 3-way Valves Opt Opt Opt Opt CODE CONFORMANCE NRTL Conformance Compliance to UL 1995 Standard Std Std Std Std NYC MEA E / Chicago Code Approval Std Std Std Std 3-1

11 Guide Specifications - Standard Equipment QUALITY ASSURANCE (ISO-9001:2001 Registered) SATS operates in an ISO-9001:2001 registered quality control environment. Each SATS employee is committed to satisfying his or her customer expectations with the highest level of consistent, measurable and continuous quality improvement. GENERAL GUIDE SPECIFICATION General Description The system shall be a ceiling mounted supplemental air conditioner designed and built to the highest of industry standards. The system shall be complete and factory run-tested before shipment. The system shall be listed and labeled in compliance with UL 1995 (# SATS-1995) by an approved Nationally Recognized Testing Laboratory (NRTL). The system shall be MEA NYC (MEA E) and Chicago Code approved. The system shall be manufactured by ISO-9001 Quality Registered Stulz Air Technology Systems, Inc. in Frederick, Maryland, USA. Component Access The air conditioner shall be fully accessible in-place through easily removable side access panels. Cabinet Construction Electrical System The system shall incorporate overcurrent and overload protection in accordance with UL 1995 requirements. Each blower motor, compressor, electric heater stage and humidifier (if applicable) shall be provided with a factory mounted and wired starter / contactor. The control circuit shall be a 24 VAC Class 2 low voltage circuit including a circuit breaker for protection. Low voltage, high voltage and grounding wires shall be color coded and shall be individually numbered at each end for ease of service tracing. All wiring shall be in accordance with the National Electric Code (NEC). Overflow Safety Float Switch A condensate pan water level switch shall be incorporated to shut the system down if a condensate overflow condition is sensed. Remote Stop / Start Included in the system's electrical control circuit shall be a 2-pin terminal connection for remote stop / start of the CeilAiR air conditioner by a remote source. pered aluminum fins with a raisedlanced fin design for maximum heat transfer. Coil end plates shall be hot dipped galvanized. The evaporator coil shall be mounted in an insulated stainless steel condensate pan. DX- Refrigeration System Thermal Expansion Valves All refrigeration piping shall be refrigerant grade tubing. Each refrigerant circuit shall include, as a minimum, refrigerant drier/strainer, sight glass with moisture detector, thermal expansion valve with rapid bleed port feature and external equalizer, evaporator coil, compressor, high pressure switch with manual reset and a low pressure switch with automatic reset. Split / Remote systems shall have a liquid line solenoid for refrigerant isolation to prevent liquid slugging. All high pressure joints shall be brazed, and the entire system shall be pressure tested at the factory with dry nitrogen, evacuated to at least 50 microns and fully charged with refrigerant. Note: All split / remote DX systems ship with a dry nitrogen holding charge. All self-contained DX systems ship with a full refrigerant (R-22) operating charge. Scroll Compressors Filter Drier/ Strainers Sight Glasses Guide Spec's - Standard Equipment The cabinet and access panels shall be fabricated from aluminum for corrosion protection and to minimize the system s weight. The panels shall be lined with 2 lb/ft 2 high density sound and thermal insulation and sealed with self-extinguishing gasketing conforming to NFPA 90A and 90B. Coils Evaporator systems shall be configured for a draw-thru air pattern to provide uniform air distribution over the evaporator coil face. The coils shall be seamless drawn copper tubes, mechanically bonded to tem- Each compressor shall be a high efficiency, high reliability and low sound Scroll Compressor, unless specifically noted otherwise. 3-2

12 Guide Spec's - Standard Equipment Guide Specifications - Standard Equipment The compressor shall be complete with charging and service schraeder ports, internal vibration isolation, internal thermal overloads, internal pressure relief valve, internal discharge gas vibration eliminator and external vibration mounting isolation. Chilled Water Systems (Models OHS-()-C) Cooling Coil: The chilled water coil shall be constructed of seamless drawn copper tubes, mechanically bonded to tempered aluminum fins for maximum heat transfer. Coil end plates shall be hot dipped galvanized. The cooling coil shall be mounted in an insulated stainless steel condensate drain pan. Control Valve: Air Technology Systems, Inc Cooling capacity shall be controlled by a factory installed slowly opening and slowly closing 2-way motorized control valve rated for a maximum 300 psig w.w.p. (Note: Please refer to page 3-10 for additional chilled water valve options.) Blowers / Motors Direct Drive Systems The blower(s) shall be direct driven with double width, double inlet housing and forward curved blades. The blower(s) shall be dynamically and statically balanced to minimize vibration and operate in the Class I range. The blower(s) shall be corrosion protected with a painted housing and impeller wheel. The three speed (208V) evaporator motor shall be factory wired for the correct speed to produce the specified air quantity. The motor(s) shall have internal overload protection. (277V & 460V direct-drive motors shall be 2-speed.) Belt Driven Systems The blower(s) shall be belt driven with double width, double inlet housing and forward curved blades and permanently lubricated ball bearings sized for an average 100,000 hours of service life. The blowers shall be dynamically and statically balanced to minimize vibration and operate in the Class I range. The blower(s) shall have an adjustable base for belt tensioning and a locking system to prevent the motors from moving. The motors drive sheaves shall have an adjustable pitch to change the speed of the blowers. The motor(s) shall be 1725 RPM and shall have overload protection and a minimum NEMA service factor of Temp & Humid Control The standard CeilAiR system is configured as a "cooling only" system. Heating, reheating and/or humidity control can be optionally added to provide total space temperature and humidity control. (Please see pages 3-5 thru 3-7 for more details.) A-Tech-1.1 Standard single stage DX and nonproportional CW Heat/Cool programmable digital thermostat. A-Tech-1.2 Standard dual stage DX Heat/ Cool programmable digital thermostat. C-Tech-10 Optional single or dual stage DX or non-proportional CW Temperature and Humidity Microprocessor Controller with alarms. A-Tech-20 & C6000 Optional all purpose Advanced Temperature and Humidity Microprocessor Controllers with alarms and optional remote BMS communications connections. (NOTE: Please refer to pages 3-6 & 3-7 for additional specification details on all CeilAiR ceiling AC control options.) 3-3

13 Guide Specifications - Standard Equipment Evaporator Air Patterns & Filtration "Ductless" Spot Cooler (Models OHS-012 thru 040-( ) only.) The air conditioner shall be designed for installation in a standard 2' x 4' ceiling grid for ductless supply and return evaporator air through a factory provided bottom supply & return filter grille. The air conditioning unit shall have a drop out, 1" deep, class 2 (per U.L. Standard 900) filter easily accessed through the hinged return grille. The filter shall have a rating of at least 80% average arrestance as measured by ASHRAE Standard test method. Ducted Evaporator (Available on all model sizes) The air conditioner shall be provided with evaporator supply and return air duct connections. EVAPORATOR AIR OUT EVAPORATOR AIR IN EVAPORATOR AIR OUT EVAPORATOR AIR IN The unit shall have slide out, 1" deep Class 2 (per U.L. Standard 900) filter(s) easily accessed through a side access panel. The filter shall have a rating of at least 80% average arrestance as measured by ASHRAE Standard test method. (Note: Please refer to Section 6 for standard CeilAiR cabinet configurations. Consult your local SATS sales representative for special applications.) DX - Heat Rejection AIR COOLED Please refer to the SATS Heat Rejection Engineering Manual for specification details of air cooled condensers and condensing units. WATER / GLYCOL COOLED Water/Glycol Cooled Condensers Coaxial Tube-In-Tube: (Models OHS-012/120-()W/G) Each evaporator refrigerant circuit shall be provided with a factory installed single pass, counterflow configured, tube-in-tube coaxial condenser; designed and tested for a 450 psig. w.w.p. 2-Way, 150 psig Regulating Valve (Standard on all OHS-( )-()W/G) Each refrigerant circuit's head pressure shall be controlled by a factory installed 2-way water / glycol regulating valve rated for 150 psig. w.w.p. (Note: 3-way and high pressure water/ glycol regulating valves are optionally available, page 3-9.) Guide Spec's - Standard Equipment 3-4

14 Optional Features - Index Optional Features - Guide Specifications OPTION Optional Features Index... page Microprocessor Controls A-Tech-1.1 (Digital Thermostat, 1-stage) A-Tech-1.2 (Digital Thermostat, 2-stage) C-Tech-10 (Micro Temp/Humid w/ Alarms) A-Tech-20 Advanced Microprocessor A-Tech-20 Remote Communications C6000 Advanced Microprocessor C6000 Remote Communications Humidity Control Options Steam Humidifier Dehumidification Cycle - Electric Reheat / Heat Hot Gas Reheat Hot Water Reheat / Heat Steam Reheat / Heat SCR Fired (0-10 Vdc) Electric Reheat Free Cooling - Valve Combinations 150 psig Rated System: (standard) way, 150 psig, DX Condenser Valve(s) - 3-way, 300/400 psig, FC Coil Valve 300 psig Rated System: (optional) way, 350 psig, DX Condenser Valve(s) - 3-way, 300/400 psig, FC Coil Valve 400 psig Rated System: (optional) way, 450 psig, DX Condenser Valves - 3-way, 400 psig, FC Coil Valve Capacity Modulation Options Snap-Acting, Hot Gas Bypass Full-Floating, Hot Gas Bypass Dual Compressor / 2-Stage Systems Modulating Chilled Water Control Valves Air Technology Systems, Inc ACCESSORIES High Static Pressure Blowers High Static Belt-Drive Blower Upgrade /11 (Up to 2.0" ext. static pressure) High Efficiency Filtration (IAQ) IAQ High Efficiency Filters Head Pressure Control Options Air Cooled - Low Ambient Control 0 F Ambient F Ambient F Ambient Phase Power Supply /1/60 Power Supply Condensate Pump /13 Smoke Detector Firestat Remote Water / Leak Detector Acoustical Compressor Sound Jackets Low Entering Condenser Water Main Power - Non-Fused Service Switch Refrigerant Lines with Quick Disconnect Couplings Water/Glycol Cooled - Regulating Valves 2-way, 150 psig (Standard) way, 350 psig way, 450 psig way, 150 psig way, 350 psig way, 450 psig Energy $aving Cooling Options Free-Cooling Cycle Alternate Water Source Cycle

15 Optional Features - Microprocessor Control Options CeilAiR Control Options 5-Levels of microprocessor control offerings allow you the flexibility of selecting the best control scheme for their unique requirements: A-Tech-1.1 Standard single stage DX and non-proportional CW Heat/Cool programmable digital thermostat. A-Tech-1.2 Standard dual stage DX Heat/ Cool programmable digital thermostat. C-Tech-10 Optional single or dual stage DX or non-proportional CW Temperature and Humidity Microprocessor Controller with alarms. A-Tech-20 Optional all purpose Advanced Temperature and Humidity Microprocessor Controller with alarms and optional remote BMS communications connections. C6000 Optional all purpose Advanced Temperature and Humidity Microprocessor Controller with alarms and optional remote BMS communications connections. A-Tech-1.1 The CeilAiR ceiling air conditioner shall be provided with SATS' "slimline", ultra-thin profile, 1- stage cool / 1-stage heat, remote wall mounted programmable digital microprocessor based controller. Note: The A-Tech-1.1 thermostat is standard on all single stage DX and non-proportional chilled water systems. A-Tech-1.2 The CeilAiR ceiling air conditioner shall be provided with SATS' "slimline", ultra-thin profile, 2-stage cool / 2-stage heat, remote wall mounted programmable digital microprocessor based controller. Note: The A-Tech-1.2 thermostat is standard on all dual stage DX systems. Common A-Tech-1.1/1.2 Features: Auto changeover for Heat/Cool Modes Selectable F or degrees C display Fan selector for continuous fan operation Built-in short cycle protection Internal switch to lock-out the keypad to prevent unauthorized tampering Electronic calibration 45 second fan purge after heating and cooling call Day/Night button for user selectable alternate setpoint manual setback 12 hour or 24 hour clock Daylight Savings Time button to adjust the clock +/- 1 hour Copy button to allow one program to be copied to subsequent days Override feature Does not require a battery Solid state electronic output C-Tech-10 Temperature & Humidity Microprocessor Controller The CeilAiR ceiling mounted air conditioner shall be provided with SATS' C-Tech-10 Microprocessor based Temperature and Humidity controller with Alarms. The controller shall incorporate a userfriendly operating environment with backlit graphic LCD display. Standard Features: Display / Keypad: Backlit LCD graphic display with characters to show the operating mode, time, set points and actual readings Internal Temperature and Humidity Sensor 3 Set Point Programmable (Normal, Temporary, Night) per day, 7 days per week Summary Alarm Contact Visual/Audible Alarm Indication: High Temp (HI T) Dirty Filter (E FL) Low Temp (LO T) Sensor Failure High Humid (HI H) Comm. Failure Low Humid (LO H) Summary (E ID) Summary Alarm (E ID): condensate overflow/water detection; smoke detection; firestat (if applicable) Maintenace Alarms: based on user defined component run-times schedules (compressor 1 (HR 1) & 2 (HR 2); evap blower (HR F). Optional Features - Microprocessor Control Options 3-6

16 Optional Features - Microprocessor Control Options 3-7 Optional Features - Microprocessor Control Options System Operation: Fan Continuous or on Demand Auto-Restart Upon Power Loss Remote Stop/Start Connection Short Cycle Protection Cold Start Time Delay Pump-Down Cycle Optional Features: Remote Temp/Humid Sensor: Optional remote wall mounted temperature and humidity sensor Remote Sensor Cable Options: 75 ft. cable length (standard option) 150 ft. cable length A-Tech-20 Air Technology Systems, Inc CyberLAN w/ A-Tech 20 ALARM CONDITIONS: Remote Communications Advanced Microprocessor Temperature & Humidity Controller with Alarms The CeilAiR ceiling mounted air conditioner shall be provided with SATS' A-Tech-20 Advanced Microprocessor based Temperature and Humidity controller with Alarms. The controller shall incorporate a "user-friendly" operating environment, to allow easy system setup and operation. Standard Features: 4 x 20 character liquid-crystal alpha-numerical display Field Configurable 30 Ft. Remote Display Cable Unit Mounted T/H Sensor Current Unit Status Component Run-Time History Visual & Audible Alarm Indication Summary Alarm Contacts Alarm History Remote Stop / Start Connection Selectable Automatic or Manual Restart Upon Power Loss Sequential Load Activation Upon Power Loss Restart Alarm Delay for Space T/H Recovery Upon Power Loss Restart Multi-Level Password Security Protection Short Cycle Protection Cold Start Time Delay Pump-Down Cycle Service Mode Time-Clock with Override Night-Setback with Override Display/Sensor Options: Remote Display Cable Options: 30 ft. cable length (standard) 75 ft. cable length 150 ft. cable length Remote Sensor Cable Options: 75 ft. cable length (standard option) 150 ft. cable length The A-Tech-20 alerts to the following alarm conditions (if applicable): High Temperature Low Temperature High Humidity Low Humidity High Head Press Low Suction Press Loss of Air Flow Loss of Power Dirty Filter Smoke Detection Firestat Leak Detection GC Pump Failure Sensor Failure Comm. Failure The operator may select which alarms are active or inactive. CyberLAN Networking Options: Multi-Unit Sequencing: Multiple CyberAiR air conditioners incorporating A-Tech-20 controls can be configured in groups of up to 6 (six) units to allow for "N+1" redundancy/backup critical application operation. The A-Tech-20 is programmed to automatically change from current primary unit operation to secondary standby unit operation via three methods: 1) Manual ChangeOver 2) Automatic Timed (1-30 days) 3) Automatic ChangeOver on Unit Failure (if applicable): Interconnect Cable Options: 75 ft. cable length (standard option) 150 ft. cable length Capacity Assist-Mode: (Additionally Optional) In addition to switchover via manual, automatic timed or failure, the CyberLAN Multi-Unit Sequencing Capacity Assist- Mode can initiate switchover to standby unit operation to assist in the temperature and/or humidity control of the space. Capacity Assist Sensor Cable Opts: 75 ft. cable length (standard option) 150 ft. cable length (Optional) REMOTE BMS CONNECTION (ModBus Gateway) A-Tech-20 Inputs & Outputs can be remotely monitored (address readable) and remotely controlled (address writable) via any building management system (BMS) / local area network (LAN) control system that can communicate via a ModBus protocol. 16 Units Per CyberLAN ModBus: Each ModBus Gateway can accommodate up to 16 (sixteen) A/C units in a group.

17 Optional Features - Microprocessor Control Options C6000 The CeilAiR ceiling-mounted air conditioner shall be provided with SATS C6000 Microprocessor based Temperature and Humidity controller with Alarms. The controller shall incorporate a user-friendly operating environment, to allow easy system setup and operation. The C6000 is a complete microprocessor based control system designed for operating, controlling and monitoring the precision air conditioning unit. The C 6000 controller shall include a full-featured LED display for visual indication of the units operating conditions. The controller shall be mounted in an indoor rated steel box. The box shall be powder coated to match the environmental control unit. The box shall contain the controller board, the IO board, and all necessary transformers and internal wiring. The control box shall be wall mounted and field wired to the environmental control unit. Display Key Pad The Display Key Pad shall feature an easy to read, liquid-crystal alpha-numerical display. The keypad/display allows the operator to visually monitor and customize unit functions and settings. The self-explanatory, keypad nomenclature shall aid in the ease of location of system programming features. Field Configurable The C6000 controller is field program configurable and capable of matching the unique needs of any data center, telecommunication or other critical area. Sensor Location Options As a standard, the C6000 temperature and humidity sensor shall be factory unit mounted in the return air stream of the Precision AC unit, after the return air filter(s). System Setup & Adjustments The C6000 shall be completely factory preprogrammed, and therefore, most applications will require no field setup. However, the default set points and their ranges are easily adjusted from C6000 keypad/display. Unit Status Display The C6000 keypad displays current unit functions and room status: Current Dry Bulb Temp Set Point Current Relative Humidity Set Point Current Unit Status System ON/OFF Cooling Heating Humidifying Dehumidifying Standby Mode Reheating Manual Mode Actual Room DB Temperature Actual Room Relative Humidity Run Times The historical run-time in hours of the following major components shall be available directly from the C6000 keypad/display: (if applicable) Blower Motor(s) Humidifier Chilled Water Valve Alarm Conditions Alarm conditions activate an audible and visual indicator. An alarm shall be acknowledged through a Reset button located on the keypad display. The C6000 alerts to the following alarm conditions (if applicable): High Temperature Low Temperature High Humidity Low Humidity Smoke Detection Firestat Leak Detection Sensor Failure Dirty Filter Loss of Air Flow Summary Alarm Contact A summary alarm dry-contact (n/o) connection shall be available for remote annunciation of an alarm condition. An additional user-defined custom alarm dry-contact shall also be available on most system configurations. Alarm History The C6000 controller provides users with a recorded history of the last 80 alarms, including the time and date of the alarm occurance. Control Inputs/Outputs The C6000 is capable of both digital (on/off) and analog input and output device control. Prior to shipment, each Precision AC unit s C6000 is factory program configured to match the unit s system operational requirements. Temperature Anticipation The C6000 shall incorporate a self-calibrating and self-adjusting control logic that adjusts the re- Optional Features - Microprocessor Control Options 3-8

18 Optional Features - Microprocessor Control Options Optional Features - Microprocessor Control Options sponse of the SATS air conditioner to changes in temperature and humidity. The system shall provide premium setpoint accuracy while controlling the room condition s rate of change, minimizing the equipment energy consumption and maximizing the system s operating life and reliability. Power Loss Restart In the event of a loss of power to the system, the C6000 can be configured for Automatic or Manual Restart. The C6000 s non-volatile memory enables the system to restart when power is restored, without the loss of the last stored set points and other system configuration settings. Sequential Load Activation Air To minimize the Technology total in rush current Systems, Inc loads during system startup/restart, the C6000 controller shall be configured for time-delay sequence startup. The user can designate specific unit restart time-delays, as well as, each unit s respective electric heater and/or humidifier. Unit restart delay can be adjusted from 0 to 10 minutes. Recovery Delay After a power loss, the C6000 s Recovery Delay feature allows the system to operate without initiating any high or low temperature or humidity alarms for a delayed period. This feature allows time (15 to 60 minutes adj.) to pull-down the conditioned space s load without nuisance alarms during initial startup or power loss restart. Security Multiple security levels prevent unauthorized adjustment of critical system control parameters. Diagnostic & Service Mode The C6000 shall incorporate a unique self-diagnostics algorithm that continually tests systems functions and hardware operation. In the event of such a failure, the user will be alerted to the condition via a visual and audible alarm. Control Board The Control Board shall initiate a self-test of the control system. Input Diagnostics All system inputs and output devices shall be continuously monitored for proper operation. Night Set-back The C6000 shall include Night Set- Back occupied/non-occupied energy saving modes. This feature enables the user to customize each unit s daily 5-day/weekly and 2-day/weekend operational schedule. Remote BMS Connection MIB GATEWAY (Optional) C-6000 Inputs & Outputs shall be remotely monitored (address readable) and remotely controlled (address writable) via any building management system (BMS)/local area network (LAN) control system that can communicate via a ModBus protocol. Each C-6000 configured for BMS communication shall incorporate an RS-485 Serial Communication Port that is field connected to a factory provided wall mounted MIB Gateway. MIB-FS GATEWAY (Optional) C-6000 Inputs & Outputs shall be remotely monitored (address readable) and remotely controlled (address writable) via a building management system (BMS)/local area network (LAN) control system. Available Protocols, Modbus RTU, Modbus TCP/IP, Bacnet IP, Bacnet MSTP, Bacnet Ethernet, Metasys N-2, and Lonworks. Each C-6000 configured for BMS communication shall incorporate an RS- 485 Serial Communication Port that is field connected to a factory provided wall mounted MIB Gateway. The MIB-FS requires field configuration. Number of units, type of protocol employed, and individual data-points monitored must be configured in the MIB-FS prior to use. 3-9

19 Optional Features - Guide Specifications SELECTED OPTIONS Humidity Control Canister Steam Humidification The humidifier shall be an electrode steam canister type and shall have an adjustable humidity output setting from 25 to 100% of the full rated humidifier capacity, an automatic flush cycle that senses the current consumption of the humidifier and controls mineral concentration of the water. A Change Cylinder light shall notify service personnel when the humidification output is below rated requirements and when maintenance is due. Dehumidification Cycle The ceiling air conditioner shall be provided with a refrigeration based dehumidification mode. Moisture shall be condensed on the cooling coil and discharged through the condensate drain. Reheat (electric, hot gas, hot water or steam) shall be provided to offset sensible cooling during the dehumidification cycle. Electric Reheat/Heat A factory mounted and wired electric resistance heater shall be included to provide automatic sensible reheating mode during the dehumidification cycle and automatic heating mode as required. Electric heaters shall be provided with thermal / magnetic circuit breakers which shall protect each conductor. The heater elements shall be housed within a stainless steel frame with mounted supports. Included shall be one automatic resetting over-temperature safety device (pilot duty), and a non-resettable over-temperature safety device (located in main power line). Heaters shall use fast reacting nichrome wire heater elements which cool quickly when turned off eliminating residual heat problems. Hot Gas Reheat: (Models OHS-()-AS, AR, W & G only) Remote Air Cooled Condenser Hot Gas Reheat Valve Flooded Head Pressure Control Valve Relief Valve Refrigerant Reclaim Port Liquid Refrigerant Receiver Sight Glass HP Scroll Compressor Solenoid Valve LP Equalizer Line Equalizer Line Feeler Bulb Refrigerant Drier / Strainer Thermal Expansion Valve Evaporator Hot Gas Cooling Coil Reheat Coil A factory installed copper tube, alumninum fin hot gas reheat coil and valve shall be provided for automatic sensible reheating mode during dehumidification cycle. Hot compressor discharge gas shall be diverted from the condenser to the hot gas reheat coil providing energy free sensible reheating. (Note: Hot Gas Reheat is not available on systems incorporating Free-Cooling or Alternate Water Source, because no method of reheat would be available during non-compressorized FC or AWS operation.) Air Flow Hot Water Reheat/Heat A factory installed copper tube, aluminum fin heat/reheat coil and 2-way control valve shall be provided to control the flow of hot water for automatic sensible reheating mode during the dehumidification cycle and automatic heating mode as required. Steam Reheat/Heat A factory installed copper tube, aluminum fin heat/reheat coil and 2-way control valve shall be provided to control the flow of steam for automatic sensible reheating mode during the dehumidification cycle and automatic heating mode as required. (Note: Steam trap and steam piping specialities shall be provided by others not SATS.) SCR Fired Reheat/Heat The electric heat/reheat shall be controlled through a Zero Firing Silicon Controlled Rectifier (SCR) with an extruded aluminum heat sink and solid state logic system to provide close dry bulb temperature control of the conditioned air. A-Tech-20 proportional (0-10 Vdc) microprocessor controls shall be provided with the SCR Fired Electric Reheat option. High Static Pressure Belt-Drive Blowers The CeilAiR ceiling air conditioner shall be provided with a high static pressure belt-driven evaporator blower to provide standard unit " e.s.p. (Note: Due to the probable change in standard unit blower motor horsepower for the High Static Belt-Drive Blower Optional Features - Guide Specifications 3-10

20 HP LP Optional Features - Guide Specifications Optional Features - Guide Specifications option, please consult your local SATS sales representative for the following unit specification changes: Blower Motor Horsepower Net Cooling Capacity Electrical Data Discharge Blower Data Unit AIr Flow Rate (CFM) will match the standard data as shown in Section 4 of this manual for each respective unit model.) Filtration CeilAiR ceiling A/C's are available with the following standard (F1) and optional (F2, F3 & F4) high efficiency IAQ conscious filtration: F1: 1", 20% Eff. Filters (standard) F2: 2", 30% Eff. Filters F3: 4", 60% Eff. Filters F4: 2", 30% Pre / 4", 60% Eff. Final Filters Air Pattern Type Filters Avail. Direct Drive 012/040: w/ Spot Cooler: F1 w/ Ducted Return: F1, F2 (n/a 024) Belt-Drive Units: w/ Ducted Return: F1, F2, F3 & F4 Filter ratings are based on dust spot efficiency ratings per ASHRAE Test Standard (Note: F2, F3 & F4 optional filters create additional static pressure and may require the High Static Pressure Belt-Drive Option. Please consult your local Sales Representative for details.) Head Pressure Control AIR COOLED - Low Ambient 0 F, Fan Cycling / Fan Speed The air cooled system shall incorporate a low ambient fan cycling / fan speed head pressure control for year-round air conditioning system operation down to 0 F DB minimum ambient air temperature. (Note: 0 F fan cycling head pressure control is a standard feature for all CeilAiR air cooled condensers and condensing units incorporating direct drive condenser fans.) -20 F, Variable Speed Control (Model WCS-( ) Condensers) The air cooled system shall incorporate a low ambient variable speed fan head pressure control for year-round system operation down to -20 F DB minimum ambient air temperature. -30 F, Flooded Control Remote Air Cooled Condenser (Optional) Flooded Head Pressure Control Valve Relief Valve Liquid Refrigerant Receiver High Pressure Switch Refrigerant Reclaim Port Sight Glass Scroll Compressor Refrigerant Drier / Strainer Low Pressure Switch Liquid Line Solenoid Valve } 3-way Equalizer Line Thermal Expansion Valve Feeler Bulb valves ship loose for field installation. Evaporator Cooling Coil Air Technology The air cooled system shall incor- Systems, Inc porate a low ambient flooded head pressure control for year-round system operation down to -30 F DB minimum ambient air temperature. This option shall include a factory installed crankcase heater, cold-start relay, liquid refrigerant receiver with receiver liquid level sight glass and head pressure regulating valve for flooded condenser operation. DX Water Cooled and Glycol Cooled systems are available with following standard (V1) and optional (V2-V6) head pressure regulating control valves: V1: 2-way, 150 psig (standard) V2: 2-way, 350 psig V3: 2-way, 450 psig V4: 3-way, 150 psig V5: 3-way, 350 psig V6: 3-way, 450 psig Each refrigerant circuit's head pressure shall be controlled by a factory (or field) installed -way water / glycol regulating valve rated for psig. w.w.p. FREE-COOLING SYSTEMS DX Water/Glycol Cooled systems with Free-Cooling are available with the following standard and optional DX head pressure and Free-Cooling valve combinations: 150 psig Rated System: (standard) DX Valves = 3-way, 150 psig FC Valve = 3-way, 300/400 psig 300 psig Rated System: (optional) DX Valves = 3-way, 350 psig FC Valve = 3-way, 300/400 psig 400 psig Rated System: (optional) DX Valves = 3-way, 450 psig FC Valve = 3-way, 400 psig Each refrigerant circuit's head pressure shall be controlled by a field installed 3-way water / glycol regulating valve rated for psig w.w.p. Free-Cooling mode cooling shall be controlled by a factory installed 3-way motorized (on/off) control valve rated for psig. w.w.p. Note: Modulating (0-10 Vdc) Free-Cooling mode cooling control is optionally available via A-Tech-20 controls and modulating 3-way FC control valve. DX - Capacity Modulation / Freeze-Protection SNAP-ACTING, Hot Gas Bypass (Models OHS-()-AS, AR, W & G only) The CeilAiR ceiling A/C shall incorporate a snap acting hot gas bypass system to provide modulation of the unit s cooling capacity and evaporator coil freeze protection under low load conditions. 3-11