GENERAL DESCRIPTION : FURNISH AND INSTALL MULTI COMPONENT ROOF MOUNTED LEYCO, MODEL CAH CUSTOM AIR HANDLER MADE SELF-CONTAINED, WEATHER RESISTANT, AIR HANDLING UNITS PER MODEL NUMBER, AND PERFORMANCE DATA TABULATED IN THE DRAWINGS. EACH UNIT SHALL BE SHIPPED AS COMPLETE PACKAGE PIPING CONNECTED AND INTERNALY WIRED. EACH UNIT SHALL BE EQUIPPED WITH AN AUTOMATIC BLEED-OFF SYSTEM. EACH UNIT SHALL BE COMPLETE INCLUDING SUPPLY FAN, PUMPS, PRE-COOLING COIL, FACTORY-INSTALLED CONTROLS AND ASSOCIATED ELECTRICAL COMPONENTS. THE SELECTION OF BLOWER AND MOTOR SHALL BE SIZED BASED ON MEDIUM LIFE FILTERS AND ACORDING TO THE EXTERNAL STATIC PRESSURE AS SHEDULED. EACH UNIT SHALL BE EQUIPPED WITH AN AUTOMATIC BLEED-OFF SYSTEM. EACH UNIT SHALL BE COMPLETE INCLUDING SUPPLY FAN, PRE-FILTERS, DIRECT EVAPORATIVE COOLING SECCTIONS, CIRCULATION PUMPS, FACTORY-INSTALLED CONTROLS AND ASSOCIATED ELECTRICAL COMPONENTS. CASING AND BASE : ALL WALLS, ROOF AND FLOOR SHALL BE CONSTRUCTED OF PRIME QUALITY WEATHERPROOF G90 GALVANIZED STEEL CASING WITH SIOPING AND OVERHANGING ROOF FAN WITH ENERGY EFFICIENT MOTOR AND EPOXY COATING. EACH UNIT SHALL BE SINGLE WALL CONSTRUCTION FOR ALL EXTERIOR WALLS AND ROOF. THE WALLS AND ROOF PANELS SHALL BE 18 GALVANIZED MINIMUN. PANELS SHALL BE REMOVABLE WHERE REQUIRED FACILITATING REMOVED OF FAN SHAFTS. HINGED ACCESS DOORS SHALL BE 24 INCH WIDE MINIMUN BY 60 INCH HIGH MINIMUN END AND LOCATED ON SAME SIDE OF THE UNIT. ACCESS DOORS SHALL BE PROVIDED WITH NEOPRANE EPDM RUBBER COMPOUND BULB TYPE SEAL GASKET. ACCESS DOORS SHALL BE A MINIMUN
OF 1 INCH THICK OF DOUBLE WALL CONSTRUCTION, WITH 1 ½ INCH POUND DENSITY INSULATION. DOORS SHALL BE PROVIDED WITH A MINIMUN OF TWO COMPRESSION LATCHES EQUAL TO VENTLOCK 310, DOORS SHALL BE PROVIDED WITH A PLEATED STEEL HOLD BACK DEVICE. THE UNIT FLOOR SHALL BE 14 GA. MINIMUN. ALL FLOOR PANELS SHALL BE TACK WELDED AT SEAMS, SEALED AND COVERED WITH A 16 GA. CAP. THE BASE OF THE UNIT SHALL BE 10 INCH MINIMUN DIE FORMED GALVANIZED STEEL FRAME. ALL CROSS MEMBERS SHALL BE TUBING WITH 14 GALVANIZED MINIMUN WALL. ALL MEMBERS SHALL BE INERT GAS WELDED. MECHANICAL FASTENERS SHALL NOT BE ALLOWED. PROVIDE A MINIMUN OF 4 INTEGRAL LIFTING LUGS. THE UNIT INTERIOR WALLS, ROOF AND FLOOR SHALL BE GALVANIZED STEEL. ALL EXTERIOR SURFACES OF THE HOUSING SHALL BE CLEANED AND PAINTED WITH 3 MIL MINIMUN THICKNESS OF EPOXY HYBRID POWDER BASE PAINT ELECTROSTATICALLY APPLIED AND BAKED FOR HARD FINISH. SUPPLY FANS : SUPPLY FANS SHALL BE AIR FOIL DOUBLE WIDTH DOUBLE INLET (AFDW) CENTRIFUGAL TYPE CLASS 1 FOR ALL WASHERS. FANS SHALL BEAR THE AMCA CERTIFIED SEAL AND BE RATED IN ACCORDANCE WITH AMCA STANDARD 210 FOR AIR DELIVERY AND 300 FOR SOUND. EACH FAN SHALL HAVE A CONSTANT PITCH V-BELT SHEAVE RATED AT 120% OF MOTOR NAMEPLATE HP. SHEAVES TO BE BUSHING TYPE AND KEYED TO THE SHAFT. FAN SHAFTS TO BE STRESS RELIEVED, GROUND AND POLISHED CARBON STEEL. SHAFTS TO HAVE A CRITICAL SPEED OF AT LEAST 20% HIGHER THAN THE MINIMUN OPERATING SPEED. SHAFTS TO HAVE A CHEMICAL AND CORROSION RESISTENT COATING WITH HIGH FILM BUILD AND BOND ATRENGTH. BEARINGS SHALL BE DOUBLE SEALED BALL TYPE SELECTED FOR AVERAGE LIFE (L50) OF 200,000 HOURS. BEARINGS TO HAVE A PRESSURE RELIEF TYPE LUBRICATION FITING EXTENDED TO THE OUTBOARD SIDE OF THE FAN FRAMS. THE FAN BASE WILL BE SET UPON SPRING VIBRATION ISOLATORS CAPABLE OF SUPPORTING THE FAN AND MOTOR ASSEMBLY AND WILL BE SELECTED FOR 99% THE CRETICAL ISOLATION EFFICIENCY. MOTORS
SHALL BE ODP TYPE 1.15 SF HORIZONTAL MOUNT. MOTORS SHALL BE MOUNTED ON DOUBLE SCREEN ADJUSTABLE SLIDE BASE. DIRECT EVAPORATIVE COOLER SECTION : THIS SECTION SHALL CONSIST OF AN 8 INCH DEEP MINIMUN RIGID CELLULOSE FIBER MEDIA. SIZED SO THAT THE FACE VELOCITY DOES NOT EXCEED 500 FPM. THE ENTIRE WATER SUMP SHALL BE CONSTRUCTED OF 16 GALVANIZED STAINLESS STEEL. THE ENTIRE SUMP SHALL BE FULLY WELDED AND LEAK TESTED. SUMP SHALL HAVE 1 ½ INCH OVERFLOW AND 1 INCH STEEL DRAIN COUPLINGS FULLY WELDED AND PIPED TO THE CHASE. WATER DISTRIBUTION HEADER SHALL BE A LOW HEAD LOSS, DRIPE TUBE ASSEMBLY CONSTRUCTED OF GALVANIZED STEEL DEFLECTOR AND COPPER PIPE. HEADER SHALL BE REMOVABLE FOR CLEANING AND PROVIDED WITH REMOVABLE AND CAPS. SPRAY NOZZLES SHALL NOT BE ACCEPTABLE. PUMP SHALL BE SUBMERSIBLE TYPE WITH SUCTION SCREEN. PUMP MOTOR TO BE THERMALLY PROTECTED AND ENCLOSED IN A HERMETICALLY SEALED, CAST IRON HOUSING FILLED WITH DIELECTRIC OFF. PROVIDE A FLOW SWITCH TO PREVENT THE PUMP RUNNING WITHOUT PROPER WATER LEVEL. AN AUTOMATIC FILL WITH FLOAT BALL AND BRASS STEM, QUICK FILL/HOUSE BIB SHALL BE PROVIDED. THE PUMP SHALL BE RATED AT 1/3 HP. 115 VOLTS, 1 PHASE. BLEED-OFF SYSTEM : THIS SYSTEM SHALL HAVE THE CAPABILITY TO DRAIN AUTOMATICALLY. PROVIDE A CONDUCTIVITY SENSOR CONNECTED TO A SOLENOID VALVE TO ALLOW AUTOMATIC DRAIN ACCORDING TO WATER CONDUCTIVITY LEVEL. FILTERS :
SHALL BE 2 INCH DEEP NON-WOVEN COTTON, PLEATED MEDIA PRE-FILTERS AS SCHEDULE BY ECO-AIR. THE FILTER MEDIA SHALL HAVE AN AVERAGE EFFICIENCY 30% ON ASHRAE TEST STANDARD 52-76. FILTER HOLDING FRAMES SHALL BE CONSTRUCTED OF 18 GA. MINIMUN GALVANIZED STEEL. FILTER BANK SHALL BE DESIGNED FOR EASY REPLACEMENT OF FILTERS FROM FRONT SIDE. INLET LOUVERS : PROVIDE DOUBLE DRAINABLE SUPPLY OUTSIDE AIR INTAKES WITH HIGH PERFORMANCE LOUVERS. FRAMES AND BLEDE SHALL BE CONSTRUCTED OF 4 INCH DEEP, 16 GA. GALVANIZED STEEL. BLADES SHALL BE 45 DEGRES DRAINABLE TYPE, JAMBS SHALL BE CONSTRUCTED WITH INTEGRAL DOWNSPOUTS FOR CARRYING WATER FROM THE BLADES TO THE LOUVER, SALL BE PROVIDE BIRDSCREEN CONSTRUCTED OF ½ INCH MESH, 0.04 INCH DIAMETER GALVANIZED STEEL WIRE MOUNTED IN ALUMINUM FRAME. LOUVERS SHALL HAVE ALL WELDED POINTS TOUCHED UP WITH A ZINC RICH PAINT. LOUVERS SHALL BEAR THE AMCA CERTIFIED SATING SEAL FOR BOTH AIR PERFORMANCE AND WATER PENETRATION. DAMPERS : INTAKE AIR DAMPERS SHALL BE GREENHECK, BLADES SHALL BE AIRFOIL BLADE DESIGN. DAMPER BLADES SHALL BE CONSTRUCTED OF MINIMUN 14 GA. GALVANIZED STEEL AND DAMPER FRAMES OF MINIMUN 18 GA. GALVANIZED STEEL. BLADES SHALL ROTATE ON STAINLESS SLEEVE BEARINGS. PROVIDE PARALLEL BLADE ARRANGEMENT WITH METAL COMPRESSIBLE JAMB SEALS AND EXTRUDED BLADE EDGE SEALS. LEAKAGE RATE SHALL NOT EXCEED 5 CFM/SQUARE FOOT AT ONE INCH WATER GAGE AND 9 CFM/SQUARE FOOT AN FOUR INCHES WATER GAGE. LEAKAGE AND PRESSURE RATINGS SHALL BE BASED ON AMCA PUBLICATION 500. DAMPER ACTUATOR SHALL BE 115 VOLTS SPRING RETURN ACTUATOR.
MOTORS AND DRIVES : ALL MOTORS SHALL BE OF HIGH EFFICIENCY AND SHALL APPROACH A POWER FACTOR OF 0.9. ALL MOTORS SHALL BE 460 VOLTS, 3 PHASE, 60 HZ, FOR 5 HP AND ABOVE. ALL MOTORS SHALL BE FURNISHED WITH A RESILLENT BASE AND PERMANENTLY BALL BEARINGS. MOTORS SHALL BE MOUNTED ON AN ADJUSTABLE BASE FOR EASY ADJUSTMENT OF BELT TENSION. DRIVES SHALL BE OF THE V-BELT TYPE WITH VARIABLE PITCH MOTOR PULLEY TO PERMIT ADJUSTMENT OF THE FAN SPEED. DRIVES SHALL BE SELECTED FOR NOT LESS THAN 150% OF MOTOR HP. FACTORY MOUNTED MOTOR STARTEAR AND FUSED DISCONNECT : PROVIDE COMBINATION STARTER / DISCONNECTS FOR EACH FAN MOTOR INDICATED IN THE CONTROLS DIAGRAMS. STARTER / DISCONNECTS SHALL BE PROPERTY SIZED, MOUNTED, WIRED, AND COMMISSIONED BY THE AIR WASHER MANUFACTURER. STARTER / DISCONNECT SHALL BE INCLUDE FUSE DISCONNECTS WITH FUSES UL LISTED TIME DELAY CLASS RK1 FUSES FOR TYPE 2 SHORT CIRCUIT COORDINATION, CONTROL TRANSFORMER (WITH PRIMARY AND SECUNDARY FUSING, AND SECUNDARY GROUNDING), HAND-OFF AUTO (H-O-A) SWITCH, TWO N.O. AUXILIARY CONTACTS, OVERLOAD HEATERS AND MANUAL RESET OVERLOAD RELAYS. UNITS WITH FACTORY MOUNTED CONTROLS SHALL ALSO INCLUDE POWER WIRING FROM THE STARTER CONTROL TRANSFORMER TO THE CONTROL SYSTEM TRANSFORMERS, AND START-STOP WIRING FROM THE DIRECT DIGITAL CONTROLLER START-STOP RELAY TO THE STARTER H-O-A SWITCH, WIRING METHODS MUST COMPLY WITH THE NATIONAL ELECTRIC CODE AND NFPA 70.
STARTER / DISCONNECTS SHALL HAVE FULL METAL ENCLOSURES WITH WELDED SEAMS. ALL WELDS SHALL BE PROPERLY FINISHED WITH NO ROUGH EDGES. ENCLOSURES MUST HAVE A PHOSPHATE PRE-PAINT TREATMENT AND A DURABLE ENAMEL HARD FINISH. THE DOOR SHALL BE REMOVABLE FOR EASE OF WIRING AND SERVICE. THE UNITS SHALL BE FOR A SINGLE ELECTRICAL POINT CONNECTION. ALL ASSOCIATED CONTROL DEVICES SHALL BE FACTORY MOUNTED AND TESTED. ENCLOSURES : STARTER AND / OR VARIABLE FREQUENCY DRIVES / DISCONNECTS SHALL BE SUPPLIED WITH GALVANIZED STEEL NEMA TYPE 4 ENCLOSURES. ENCLOSURES SHALL BE MADE OF HEAVY GAUGE GALVANIZED STEEL. COVERS SHALL HAVE SYNTHETIC RUBBER GASKETS. PANEL SHALL BE CONSTRUCTED IN STRICT ACCORDANCE WITH NEC AND UL-508A REQUIREMENTS FOR INDUSTRIAL CONTROL PANELS. FACTORY COMMISSIONING : TRAINED FACTORY PERSONNEL ENSURE PROPER OPERATION OF THE STARTERS AND / OR VARIABLE FREQUENCY DRIVES BY A THROUGH FACTORY TEST. UNITS SHALL BE ENERGIZED THROUGH THE HAND POSITION, AS WELL AS THE AUTO POSITION WHEN FACTORY MOUNTED CONTROLS ARE AVAILABLE. RK1 TYPE 2 FUSES AND OVERLOAD HEATERS MUST BE SELECTED INDIVIDUALLY FOR THE VOLTAGE, HORSEPOWER, AND FULL LOAD AMPS OF THE ACTUAL MOTOR BEING SUPPLIED. WATER COOLING COIL :
CLEARLY LABEL SUPPLY AND RETURN HEADERS ON OUTSIDE OF UNITS SUCH THAT DIRECTION OF COIL WATER- FLOW IS COUNTER TO DIRECTION OF UNIT AIRFLOW. COILS SHALL BE PROOF TESTED TO 300 PSIG AND LEAK TESTED TO 200 PSIG AIR PRESSURE UNDER WATER. CONSTRUCT HEADERS OF ROUND COPPER PIPE OR CAST IRON. CONSTRUCT TUBES OF ½ INCH O.D. MINIMUN 0.025 INCH THICK COPPER AND CONSTRUCT FINS OF 0.0075 ALUMINUM. CONNECTIONS SHALL BE MALE THREAD (MPT) SHEDULE 40 RED BRASS WITH 1/8 INCH VENT AND DRAIN PROVIDED FOR COMPLETS COIL DRAINAGE.