York ECO R-407C User's Manual
Contents
1. Quantity 12 8 12 8 12 8 12 Size length x width in 25 16 25 20 25 16 25 20 25x16 25 20 25 16 25 20 Total Filter Face Area square feet 63 9 63 9 63 9 63 9 Filters 2 cleanable Quantity 12 8 12 8 12 8 12 Size length x width in 25x16 25x20 25x16 25x20 25x16 25x20 25x16 25x20 Total Filter Face Area square feet 63 9 63 9 63 9 63 9 Filters 2 pleated 30 efficient Quantity 12 8 12 8 12 8 12 Size length x width in 25x16 25x20 25x16 25x20 25x16 25x20 25x16 25x20 Total Filter Face Area square feet 63 9 63 9 63 9 63 9 Filters 12 rigid 65 2 30 prefilter Quantity 4 9 1 4 9 1 4 9 1 4 9 Size length x width 25x16 25x20 16x20 25 16 25 20 16 20 25 16 25 20 16 20 25x16 25x20 Total Filter Face Area square feet 44 6 44 6 44 6 44 6 Filters 12 rigid 95 2 30 prefilter Quantity 4 9 1 4 9 1 4 9 1 4 9 Size length x width in 25 16 25 20 16 20 25 16 25 20 16 20 25 16 25 20 16 20 25 16 25 200 Total Filter Face Area square feet 44 6 44 6 44 6 44 6 Filters 2 carbon 30 efficient Quantity 8 12 8 12 8 12 8 12 Size length x width in 25 16 25 20 25 16 25 20 25 16 25x20 25 16 25 20 Total Filter Face Area square feet 63 9 63 9 63 9 63 9 Refrigerant HFC 407C HFC 407C HFC 407C HFC 407C Minimum OA Temp for Mech Cl2. ENTERING 90 1 74 WB F SHC 72 67 589 318 62 542 384 72 67 597 326 62 550 397 72 67 609 337 62 563 419 72 67 623 350 62 576 443 72 67 629 356 62 583 455 Rated performance is at sea level Cooling capacities are gross cooling capacity 115 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F ENTERING 7 74 we F suc 72 67 518 254 62 467 306 72 67 537 276 62 489 349 72 67 547 288 62 500 371 72 67 558 301 62 513 396 72 67 563 307 62 520 408 Rated performance is at sea level Cooling capacities are gross cooling capacity YORK INTERNATIONAL Cooling Performance Data 55 Ton Model TABLE 3 COOLING PERFORMANCE DATA 55 TON MODEL 12000 16000 19250 22000 24000 CFM 12000 16000 19250 22000 24000 85 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F ENTERING 90 83 7 74 we F suc 72 732 488 67 631 346 62 579 456 72 67 642 353 62 591 421 72 67 666 367 62 616 458 72 67 679 375 62 630 375 72 67 685 378 62 636 357 Rated performance is at sea level Cooling capacities are
3. 20 7 50 Through 65 Ton Exhaust Fan 21 8 Component Static Pressure Drops 22 9 COmpressOIS e eee ri esie ti ete t vts ed Etre 24 10 Supply and Exhaust Fan Motor Electrical Data 25 11 Condenser Fan Motors 25 12 Controls and Convenience Outlet sse 25 2 YORK INTERNATIONAL FORM 100 50 1 PAGE FIGURES 1 Packaged Rooftop Air Conditioning Unit 4 2 Single Point Power Supply 31 3 Single Point Power Supply Wiring with Non Fused Disconnect 32 4 Dual Point Power Supply Wiring a 33 5 Field Control Wiring n 34 6 General Arrangement Drawing Bottom Return Bottom Supply 35 7 General Arrangement Drawing Rear Return Left or Right Supply 36 8 Curb Layout Drawing n 37 NOMENCLATURE BASIC MODEL NUMBER UL lt 01 234 567 SE PRODUCT NOMINAL CAPACITY 1 LLL YORK 0 5 0 50 Packaged 0 5 5 55 ton Rooftop 0 6 0 60 Air Cooled 0 6 5 65 ton L Scroll YORK INTERNATIONAL 8 9 10 11 12 13 14 15 16 APPLICATION REFRIGERANT VOLTAGE DUCT LOCATIONS DESIGN SPECIAL L L i B R 407C 1
4. 100 50 1 201 al YORK Packaged Rooftop Air Conditioning Units 00406VIP R 407C OPTIMIZED 50 THROUGH 65 TONS BUILDINGS ALLY TABLE OF CONTENTS PAGE NOm n 6 8glufe uay iayy aaa Wq Semua asqa deen e 3 m 4 RB way dee eon eee 7 Application uy etu y bau amu 9 Cooling Performance 12 Fan u eee dic d una b 20 Electrical Data 24 Gontfols iret 26 Power WINING ku n Suku te ts ola eee a 31 Field Control Wiring eene nnne nennen nenne 34 General Arrangement Drawing 35 Curb Layout Drawing l ua DR e er renee 37 Mechanical Specifications sse 38 TABLES 1 Physical Data onis ce cere e actin needa 7 2 Cooling Performance Data 50 Ton 12 3 Cooling Performance Data 55 Ton 14 4 Cooling Performance Data 60 Ton 16 5 Cooling Performance Data 65 Ton 18 6 50 Through 65 Ton Supply Fan
5. 72 67 592 335 62 547 426 72 Z 67 603 343 62 559 443 72 Z 67 608 347 62 565 450 Cooling Performance Data 60 Ton Model TABLE 4 COOLING PERFORMANCE DATA 60 MODEL 85 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F Eg WB F CAP SHC 72 14000 67 723 377 62 654 424 72 m 18000 67 761 415 62 699 502 72 EN 21000 67 780 434 62 722 541 72 24000 67 799 453 62 744 580 72 27000 67 808 461 62 755 598 Rated performance is at sea level Cooling capacities are gross cooling capacity 95 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F WB SHC 72 _ 14000 67 696 363 62 673 318 72 18000 67 732 402 62 681 494 72 21000 67 751 421 62 685 582 72 m 24000 67 769 441 62 689 670 72 an 27000 67 778 450 62 690 710 Rated performance is at sea level Cooling capacities are gross cooling capacity 16 YORK INTERNATIONAL FORM 100 50 1 TABLE 4 COOLING PERFORMANCE DATA 60 TON MODEL CONT D 105 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F CFM Eg 74 WB F SHC 72 14000 67 678 350 62 624 412 72 18000 67 708 389 62 655 480 72 21000 67 723 409
6. Ideally the center of gravity should be located over a structural support or building column Location of unit s should also be away from build ing flue stacks or exhaust ventilators to prevent pos sible reintroduction of contaminated air through the outside air intakes Be sure the supporting structures will not obstruct the duct gas or wiring connections Proper service clearance space of 6 feet around the perimeter of the unit and 12 feet to any adja cent units is required to eliminate cross contami nation of exhaust and outdoor air and for mainte nance tasks such as coil pull and cleaning No ob structions should be above the condensing unit section RIGGING Proper rigging and handling of the equipment is man datory during unloading and setting it into position to retain warranty status YORK INTERNATIONAL Spreader bars must be used to prevent damage to the unit casing All lifting lugs must be used when lifting the rooftop unit Care must be taken to keep the unit in the upright posi tion during rigging and to prevent damage to the water tight seams in the unit casing Avoid unnecessary jar ring or rough handling Ground Level Locations It is important that the units be installed on a substan tial base that will not settle causing strain on the refrig erant lines and sheet metal and resulting in possible leaks A one piece concrete slab with footers extended below the frost line is highly recomm
7. controller will monitor a reference Zone Temperature and command the Supply Fan to start when the unit goes into the Occupied mode If the zone temperature is above the VAV Setpoint for SAT Reset the OptiLogic controller will modulate the outside air damper Economizer available and condi tions suitable and or stage compressors up and down as required to maintain the VAV High Supply Air Tem perature Setpoint If the zone temperature is below or falls below the VAV Setpoint for SAT Reset the OptiLogic controller will modulate the Outside Air Damper Economizer avail able and conditions suitable and or stage compres sors up and down as required to maintain the VAV Low Supply Air Temperature Setpoint As with thermostat operation this sequence is also a Supply Air Temperature Reset algorithm based on Zone Temperature 29 Controls continued Stand Alone Control Ifthe unitis not configured for Thermostat or Zone Sen sor operation the unit will operate in Stand Alone Mode In Stand Alone Mode the OptiLogic Controller will monitor only the Occupied Unoccupied state When the unit is commanded into the Occupied Mode of opera tion the OptiLogic Controller will start the Supply Fan If the unit is equipped with an Economizer the Control ler will check to see if Outside Air conditions are suit able for Economizing The controller will then use Out side Air when available and suitable and or stage c
8. 7 wire thermostat 2 cool 2 heat a space tem perature sensor or stand alone VAV only Note a field wiring terminal block is provided to facilitate unit setup and installation In lieu of the hard wired control options the OptiLogic rooftop unit controller can be connected to and oper ated by a Building Automation System BAS If re quired the OptiLogic rooftop unit controller can be equipped with an optional BACNet IP communication card which allows communication via Ethernet to a BACNet IP based BAS UNOCCUPIED OCCUPIED SWITCHING Depending on application the unit can be indexed be tween unoccupied and occupied modes of operation by one of three methods hard wired input internal time clock or BAS A contact closure input is provided for hard wiring to an external indexing device such as a central time clock thermostat with built in scheduling manual switch The unit controller is also equipped with a built in 7 day time clock which can be used in lieu of the contact closure input to switch the unit be tween Unoccupied and Occupied modes of operation The internal time clock is fully configurable via the user interface and includes Holiday scheduling In addition to the hard wired input or the internal time clock the unit can also be indexed between unoccupied and oc cupied modes of operation via a BAS command Note a unit operated from a space sensor can be equipped to temporarily override an uno
9. F ENTERING 90 86 7 74 we F suc 72 67 737 393 62 680 477 72 67 748 406 62 691 500 72 67 766 426 62 710 538 72 67 784 447 62 729 577 72 67 792 456 62 738 441 Rated performance is at sea level Cooling capacities are gross cooling capacity 18 YORK INTERNATIONAL TABLE 5 COOLING PERFORMANCE DATA 65 TON MODEL CONT D CFM 14000 18000 21000 24000 27000 CFM 14000 18000 21000 24000 27000 105 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F FORM 100 50 EG1 ENTERNG 90 86 83 7 74 WB F CAP SHC SHC SHC CAP SHC CAP SHC 72 67 708 381 62 653 466 72 67 718 393 62 663 486 72 67 734 413 62 681 522 72 67 751 433 62 699 558 72 67 759 442 62 707 574 Rated performance is at sea level Cooling capacities are gross cooling capacity 115 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F ENTERING 90 86 s 74 we F suc 72 67 678 368 62 625 452 72 67 687 380 62 635 473 72 67 703 400 62 651 508 72 67 718 419 62 668 543 72 67 725 428 62 676 414 Rated performance is at sea level Cooling capacities ar
10. discharge damper The OptiLogic controller monitors the pressure inside the building and controls the Exhaust Damper and the Exhaust Fan If the Building Pressure rises the Exhaust Damper is pro portionally controlled open and the Exhaust Fan is con trolled ON If the Building Pressure falls the Exhaust Damper is proportionally controlled closed and the Ex haust Fan is controlled OFF The position of the Ex haust Damper in which the Exhaust Fan is controlled ON and OFF as well as the Building Pressure setpoint is user selectable from the OptiLogic User Interface Powered Variable Volume Exhaust VFD Controlled This optional variable volume powered exhaust system consist of an Exhaust Fan driven by a Variable Fre quency Drive VFD which is controlled by the OptiLogic controller The OptiLogic controller moni tors the pressure within the building As the pressure rises the VFD is controlled to increase Exhaust Fan speed As the pressure falls the VFD is controlled to decrease Exhaust Fan speed The Building Pressure Setpoint is user selectable from the OptiLogic User Interface LOW AMBIENT OPERATION The OptiLogic controller continuously monitors the outside air temperature to determine if mechanical cool ing should be allowed As a safety if the Outside Air temperature falls to or below the Low Ambient Lockout temperature mechanical cooling is prevented from op erating For units with economizers the Low Am
11. gross cooling capacity 95 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F ENTERING 90 8 7 74 we F suc 72 67 610 334 62 566 398 72 67 620 341 62 576 415 72 67 642 357 62 598 453 72 67 654 365 62 609 473 72 67 659 369 62 614 369 Rated performance is at sea level Cooling capacities are gross cooling capacity 14 YORK INTERNATIONAL TABLE 3 COOLING PERFORMANCE DATA 55 TON MODEL CONT D CFM 12000 16000 19250 22000 24000 CFM 12000 16000 19250 22000 24000 ENTERIN 105 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F N N FORM 100 50 EG1 WB F H CAP SHC 72 67 593 322 62 546 390 72 67 601 330 62 554 405 72 67 619 346 62 572 436 72 EM 67 628 355 62 582 453 72 m 67 632 359 62 586 460 Rated performance is at sea level Cooling capacities are gross cooling capacity 115 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F YORK INTERNATIONAL Rated performance is at sea level Cooling capacities are gross cooling capacity ENTERING 8 7 WB F CAP SHC 72 67 559 312 62 512 381 72 67 570 319 62 523 395
12. is also available Harsh Environments A variety of coil coating and materials are available as well as hail guards to pro tect coils from weather damage Seismic and hurri cane duty curbs and fan restraints are available YORK INTERNATIONAL Physical Data FORM 100 50 EG1 TABLE 1 PHYSICAL DATA MODEL SIZE 50 55 60 65 GENERAL DATA Length Inches 336 336 336 336 Width Inches 92 92 92 92 Height Inches 82 82 82 82 Operating Weights Lbs base unit no options Cooling Only Rigging amp Refrigerant 8 080 8 290 8 530 8 740 Rigging Weights Lbs base unit no options Cooling Only 8 010 8 210 8 440 8 640 Option Weights Lbs Power Exhaust Blower motor fan skid amp mod damper 647 647 647 647 Power Exhaust Blower motor fan skid VFD amp baro damper 654 654 654 654 100 AMS Measurement Station amp Mounting 110 110 110 110 25 75 AMS Measurement Station amp Mounting 130 130 130 130 Min AMS Measurement Station amp Mounting 40 40 40 40 Barometric only 36 36 36 36 Condenser Hail Guard 32 32 32 32 Copper Condenser Coils 617 617 793 793 Copper Evaporator Coils 262 320 400 500 Roof Curb Weights Lbs 14 Full Perimeter Roof Curb 787 787 787 787 14 Open Condenser Roof Curb 555 555 555 555 Compressor Data Quantity Size Nominal Tons 4 13 4 13 4 15 4 15 Type Scroll Scroll Scroll Scroll Capacity Steps 2
13. mbh total cooling capacity and 497 mbh sensible cooling capacity Thus a 50 ton unit is selected 11 Cooling Performance Data 50 Ton Model TABLE 2 COOLING PERFORMANCE DATA 50 TON MODEL 85 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F gt ENTERING WB CAP SHC 72 10000 67 626 343 62 574 455 72 14000 67 637 349 62 585 439 72 17500 67 653 359 62 603 438 72 20000 67 672 370 62 622 467 72 22500 67 680 376 62 631 370 Rated performance is at sea level Cooling capacities are gross cooling capacity 95 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F a f SHC 72 10000 67 605 331 62 562 390 72 14000 67 615 338 62 571 407 72 17500 67 630 348 62 586 433 72 20000 67 647 360 62 602 462 72 22500 67 655 366 62 610 447 Rated performance is at sea level Cooling capacities are gross cooling capacity 12 YORK INTERNATIONAL TABLE 2 COOLING PERFORMANCE DATA 50 TON MODEL CONT D CFM 10000 14000 17500 20000 22500 CFM 10000 14000 17500 20000 22500 105 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F FORM 100 50 EG1
14. must be sourced from the unit Use of another power source external of the unit may cause equipment damage P eer Unoccupie J Unoccupied Input Gord MODO On pen Normal Shutdown Input 7 CBE MOI Purge pen Normal Smoke Purge Input 2 VAV Heat 24 Signal 2 Relay Output Common Note VAV Heat Relay output shall be used to command the VAV boxes LD06158 to open FIG 5 FIELD CONTROL WIRING 34 YORK INTERNATIONAL TOP VIEW SUPPLY OPENING IVNOILLVNHALLNI 31 7 8 36 7 8 CONTROL PANEL DETAIL 106 7 16 RETURN OPENING 83 rP 28 5 8 149 5 16 35 3 4 10 cP FS we b fa k d EE e F TEES N b 4 e 72 ms TUNI a L 5 REAR q t 4 4 2 FPT FRONT VIEW io COUPLING 1 9 5 DRAIN CONN SIDE VIEW 1 16 PE 3 16 LEFT SIDE 16 1 16 7 3 16 LEFT SIDE SIDE 24 516 236 1 16 95 1 4 SEE NOTE 6 3 a 140 3 4 gt lt 379 9 16 NOTES FIG 6 GENERAL ARRANGEMENT DRAWING 1 10 CLEARANCE MINIMAL OVER THE TOP OF THE CONDENSING UNIT 2 ONLY ONE ADJACENT WALL CAN EXCEED UNIT HEIGHT 3 12 CLEARANCE REQUIRED TO ADJACENT UNITS 4 8 SERVICE ACCESS RECOMMENDED ON ONE SIDE 5 ECONO
15. of a VFD failure Power Supply Connections single point power with manual disconnect and dual point power wiring options are available for various applications Supply air setpoint reset by outside air or space air temperature Allows VAV supply air setpoint to float upward saving energy if the outdoor air temperature or the space temperature is sufficiently low Supply Fan Isolation the entire supply fan assem bly shall be isolated from the unit base with 2 deflec tion springs Supply and Exhaust Fan Motors high efficiency ODP and standard and high efficiency TEFC motors are available all meeting the Energy Policy Act of 1992 EPACT Low Ambient Operation a low ambient kit is avail able to control compressor head pressure via VFD con denser fan speed control Head pressure control is accomplished by monitoring head pressure with suc tion and discharge line pressure transducers rather than less accurate temperature control ECONOMIZERS Manual Damper Economizer economizer is avail able with a manual damper adjustable between 0 25 percent Two Position Damper Economizer economizer is available with a two position damper with the open po sition adjustable between 0 25 percent The operation of the two position economizer shall be based on oc cupancy occupied is open unoccupied is closed YORK INTERNATIONAL FORM 100 50 1 Modulating Damper Economizer economizer is available with a mo
16. static pressure Power supply is 460 V 3ph 60Hz YORK INTERNATIONAL and the unit requires a modulating economizer 2 inch pleated filters bottom supply and bottom return air open ings and is constant volume Select Unit 1 Determine the internal static pressure drop of the cabinet by referencing Table 8 Wet evaporator coil 0 54 Bottom supply opening 0 14 Bottom return opening 0 13 2 inch pleated filters 0 10 Economizer openings 0 24 Modulating economizer dampers 0 31 Total 1 46 IWG 2 Determine the total static pressure by adding the internal to the external static pressure TSP 1 46 IWG 2 25 IWG 9 71 IWG total static pressure 3 Determine the BHP of the supply fan from Table 6 using the supply air flow and total static pressure From the table we interpolate to get 15 1 BHP As suming drive loss of 3 and a motor efficiency of 90 we can calculate the heat rejection of the sup ply fan motor as 2545 x 15 1 0 90 x 1 0 03 44 0 mbh Required Cooling Capacities Total 600 44 0 644 mbh Sensible 450 44 0 494 mbh 4 Required total and sensible capacities are 644 mbh and 494 mbh respectively Using the Cooling Per formance Data starting with Tables 2 locate the table with the correct ambient air temperature Next trace the 83 F entering air dry bulb temperature to match the 17 500 cfm and 67 F entering wet bulb temperature condition The resulting conditions are from the table 645
17. the air handling unit YORK INTERNATIONAL FORM 100 50 1 Enhanced filtration The Eco unit gives design ers the flexibility to meet various IAQ requirements with a full range of rigid and throwaway filters at various efficiency levels Reliable Scroll Compressor Technology Reliable efficient trouble free operation is the true mea sure of a packaged rooftop s value That s why YORK Eco Packaged Rooftop Air Conditioners use estab lished scroll compressor technology to deliver depend able economical performance a wide range of appli cations With the Eco Packaged Rooftop you get the latest generation of compressor enhancements added to the scroll s inherent strengths The simplicity of a hermetic scroll compressor allows the use of fewer moving parts to minimize breakdown YORK also em ploys the latest sealing technology to avoid metal to metal contact Axial sealing is accomplished with float ing tip seals while radial sealing utilizes a microcushion of oil The result a maintenance free compressor pro viding minimum wear and maximum runtime A scroll compressor operates with two scroll members a fixed scroll and an identical orbiting scroll turned 180 degrees like two hands curled and interlocked together As the orbiting scroll oscillates against the fixed scroll it traps and compresses suction gas inside involute pockets As the orbiting scroll moves the gas is com pressed into the central ar
18. the unit shall remain idle with the Supply Fan operating as required YORK INTERNATIONAL When a Cooling Stage 1 call Y1 is received and the unit is equipped with an economizer the OptiLogic controller will check the Outside Air conditions to de termine if conditions are suitable for economizing and modulate the outside air damper and or stage up com pressors as required to maintain the VAV High Supply Air Temperature Setpoint This setpoint is user select able at the OptiLogic User Interface The OptiLogic controller will control to this setpoint as long as Cooling Stage 1 Y1 remains active When a Cooling Stage 2 call Y2 is received and the unit is equipped with an economizer the OptiLogic controller will check the Outside Air conditions to de termine if conditions are suitable for economizing and modulate the outside air damper and or stage up com pressors as required to maintain the VAV Low Supply Air Temperature Setpoint This setpoint is user select able at the OptiLogic User Interface The OptiLogic controller will control to this setpoint as long as Cooling Stage 2 Y2 remains active The VAV High SAT Setpoint is always greater than the VAN Low SAT Setpoint and because of this essentially makes this control sequence a Supply Air Tempera ture Reset algorithm based on Zone Temperature Zone Sensor Control When a VAV unit is configured for Zone Sensor opera tion the OptiLogic
19. 5 50 75 100 25 50 75 100 25 50 75 100 25 50 75 100 Supply Fan and Drive Quantity 1 1 1 1 Type FC Size 25 22 25 22 25 22 25 22 Motor Size Range min to max HP 7 5 40 7 5 40 7 5 40 7 5 40 Air Flow Range min to max cfm 10000 22500 12000 24000 14000 27000 14000 27000 Static Pressure Range min to max ESP 0 4 0 4 0 4 0 4 Exhaust Fan Quantity 2 2 2 2 Type FG FG FG FG Size 15 15 15 15 15 15 15 15 Motor Size Range min to max HP 5 20 5 20 5 20 5 20 Air Flow Range min to max cfm 0 20000 0 20000 0 20000 0 20000 Static Pressure Range min to max ESP 0 1 0 1 0 1 0 1 Evaporator Coil Size square feet 48 8 48 8 48 8 48 8 Number of rows fins per inch 3 8 4 8 4 12 5 10 Diameter Surface 1 2 enhanced 1 2 enhanced 1 2 enhanced 1 2 enhanced Condenser Coil Aluminum Fins Size square feet 121 3 121 3 121 3 121 3 Number of rows fins per inch 3 14 3 14 3 18 3 18 Tube Diameter 3 8 3 8 3 8 3 8 Condenser Coil Copper Fins Opt Size square feet 121 3 121 3 121 3 121 3 Number of rows fins per inch 3 14 3 14 3 18 3 18 Tube Diameter 3 8 3 8 3 8 3 8 YORK INTERNATIONAL Physical Data continued TABLE 1 PHYSICAL DATA Cont d MODEL SIZE 50 55 60 65 GENERAL DATA Condenser Fans Quantity 4 4 4 4 Type Prop Prop Prop Prop 36 36 36 36 Diameter inches Filters 2 throwaway
20. 6 0 19 0 21 0 22 0 26 0 29 0 14 0 16 0 19 0 22 0 24 0 26 0 29 0 32 0 34 0 14 0 16 0 19 0 22 0 24 0 26 0 29 0 32 0 34 50 55 60 65 For Aluminum Fins Only 22 YORK INTERNATIONAL FORM 100 50 EG1 FILTERS RIGID FILTER ECONOMIZER POWERED 12 RIGID 12 RIGID FRESH AIR MANUAL OR RACK NO EXHAUST 65 95 OPENINGS 2 POSITION MODULATION MEDIA 0 05 0 08 0 07 0 11 0 09 0 15 0 11 0 20 0 12 0 24 0 13 0 25 0 15 0 31 0 16 0 34 0 17 0 37 0 17 0 39 0 07 0 11 0 09 0 15 0 11 0 20 0 13 0 25 0 14 0 29 0 15 0 31 0 17 0 37 0 19 0 45 0 09 0 15 0 11 0 20 0 13 0 25 0 15 0 31 0 16 0 34 0 17 0 37 0 19 0 45 0 21 0 52 0 23 0 56 0 09 0 15 0 11 0 20 0 13 0 25 0 15 0 31 0 16 0 34 0 17 0 37 0 19 0 45 0 21 0 52 0 23 0 56 YORK INTERNATIONAL 23 Electrical Data ELECTRICAL SERVICE SIZING In order to use the electrical service required for the cooling only Eco rooftop use the appropriate calcula tions listed below from U L 1995 Based on the operat ing mode and configuration of the rooftop the calcula tions will yield different MCA minimum circuit ampac ity and MOP maximum overcurrent protection Using the following load definitions and calculations determine the correct ele
21. 62 670 515 72 24000 67 738 428 62 686 549 72 27000 67 744 437 62 693 565 Rated performance is at sea level Cooling capacities gross cooling capacity 115 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F wa SHG 72 14000 67 633 338 62 574 404 72 18000 67 669 376 62 617 472 72 21000 67 687 395 62 638 505 72 24000 67 706 414 62 659 539 72 27000 67 714 423 62 669 555 Rated performance is at sea level Cooling capacities are gross cooling capacity YORK INTERNATIONAL Cooling Performance Data 65 Ton Model TABLE 5 COOLING PERFORMANCE DATA 65 MODEL CFM 14000 18000 21000 24000 27000 CFM 14000 18000 21000 24000 27000 85 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB F ENTERING 90 86 9 7 7 WB F CAP SHC CAP SHC CAP SHC SHC CAP SHC 72 67 764 406 62 706 492 72 67 776 418 62 717 513 72 67 796 439 62 737 548 72 67 815 460 62 757 584 72 67 824 469 62 766 455 Rated performance is at sea level Cooling capacities are gross cooling capacity 95 AIR ON CONDENSER COIL CAPACITY MBH AT ENTERING DRY BULB
22. 7 200 3 60 B Bottom Supply A Rev Level A 2 8 230 3 60 L Left Supply S Std Product 4 6 460 3 60 R Right Supply X Special 5 8 575 3 60 B Bottom Return F Front Return S Side Return 212 Cooling Only C Constant Volume V VAV VFD VAV VFD w Manual Bypass Introduction FIG 1 PACKAGED ROOFTOP AIR CONDITIONING UNIT FEATURES BENEFITS Ecological and Economical Design First packaged RTU with 407C optimized design Cooling and Heating Superior operating perfor mance provides lower operating costs Smaller steps of cooling capacity provide tighter control of building environment and occupant comfort while optimizing energy efficiency Indoor Air Quality IAQ Outside air economiz ers provide energy savings in free cooling mode and can provide a healthier and more comfortable building environment by introducing fresh outside air into the building as needed Indoor Air Quality IAQ requirements for building ventilation and comfort are controlled through the microprocessor control panel Optional air flow measurement provides an accu rate means of tracking air quality and alerting the occupants or building owner to unhealthy situations High Efficiency Motors High efficiency motors are available for optimum energy efficiency All motors used on the eco packaged rooftop air conditioner meet U S EPACT 1992 minimum requirements Indoor Air Quality IAQ Double sloped stainless
23. 7 5 8 2 10 0 11 4 15 0 16 0 20 0 20 0 25 0 24 2 30 0 30 3 40 0 38 0 TABLE 11 CONDENSER FAN MOTORS EACH NOMINAL VOLTAGE NOMINAL 208V 230V 460V 575V TONS FLA FLA FLA FLA 50 2 7 55 2 7 60 2 7 65 2 7 YORK INTERNATIONAL Premium Efficiency NOMINAL VOLTAGE MOTOR 208V 230V 460V 575V HP FLA FLA FLA FLA 5 0 5 5 7 5 7 9 10 0 10 3 15 0 14 5 20 0 19 3 25 0 24 5 30 0 30 0 40 0 38 0 TABLE 12 CONTROLS AND CONVENIENCE OUTLET NOMINAL VOLTAGE 208V 230V 460V 575V DESCRIPTION Be 9 AMPS 5 AMPS AMPS Control Transformer 3 6 3 3 1 6 3 3 Convenience Outlet 9 6 8 7 4 3 3 5 25 Controls CONTROL SEQUENCES FOR ALL UNITS GENERAL The control system for the YORK Packaged Roof top Unit is fully self contained and based around an OptiLogic rooftop unit controller To aid in unit setup maintenance and operation the OptiLogic rooftop unit controller is equipped with a user interface that is based around a 4 line x 20 character backlit LCD dis play The LCD displays plain language text in a menu driven format to facilitate use In addition to the display the OptiLogic user interface is also equipped with an LED indicator light which will warn of any abnormal operation of the equipment or communication failures For the maximum in system flexibility the YORK ECO Packaged Rooftop Unit can be operated by either a typical
24. 995 Section 36 15 N E C Section 440 22 Use copper conductors only On units with an optional disconnect switch the supplied disconnect switch is a Disconnecting Means as defined in the N E C Section 100 and is intended for isolating the unit from the available power supply to perform maintenance and troubleshooting This disconnect switch is not intended to be a Load Break Device FIG 4 DUAL POINT POWER SUPPLY WIRING YORK INTERNATIONAL 33 Field Control Wiring Wiring Notes 1 Wiring shown indicates typical wiring 2 All wiring is Class 2 low voltage 3 Maximum power available from the 24 VAC G terminal is 40 VA 5 5 4 Use shielded wire where shown 24 4 464289 2 o O98 SS rODOIO eleleleleleleleolelelelelelolelelelelelo 11 2 3 4 5 61 7 8 9 0111 12113 14 15 16 17 18 19 20 21 e 910101910101019101010191010109 i i 7 Wire Thermostat 7 7 COMMON R 24VAC Y1 Cool Stage 1 Y2 Cool Stage 2 G Fan 1K Nickel Signal Use Shielded Wire 2 RTD Sensor Use Shielded Wire p 1 5K Adjust Signal P Potentiometer Common CO Sensor Use Shielded Wire Signal 27 0 5V Output Common Note 24VAC switch voltage
25. MIZER AND EXHAUST HOODS WHERE APPLICABLE ARE FOLDED INSIDE UNIT FOR SHIPMENT 6 DIM IS TO OUTSIDE OF LIFTING LUGS 5 3 4 72 FRON a 5 WNOLLOS 1 WNOLLOS f SECTION DESCRIPTIONS EE Economizer FE Fan Exhaust MB Mixing Box _F Filter Segment Cooling Coils FS Supply Fan DP Discharge Plenum CO Condenser Section CP Control Panel 72 72 SIDE SIDE 4 REAR VIEW 92 3 16 1 9 16 1006417 09 09001 INHOd 96 TWNOILVNYALNI NOTES 1 10 CLEARANCE MINIMAL OVER THE TOP OF THE CONDENSING UNIT 2 ONLY ONE ADJACENT WALL CAN EXCEED UNIT HEIGHT 3 12 CLEARANCE REQUIRED TO ADJACENT UNITS 4 8 SERVICE ACCESS RECOMMENDED ON ONE SIDE 5 ECONOMIZER AND EXHAUST HOODS WHERE APPLICABLE ARE FOLDED INSIDE UNIT FOR SHIPMENT 5 amp 31 7 8 36 7 8 CONTROL PANEL DETAIL N TOP VIEW Kiz SUPPLY OPENING FRONT VIEW 16 1 16 24 516 95 1 4 SEE NOTE 6 140 3 4 I b FIG 7 GENERAL ARRANGEMENT DRAWING 117 7 16 28 1 2 SIDE VIEW LEFT SIDE 30 11 16 OPENING RETURN 1 HV3H AlddNS HO 1331 SECTION DESCRIPTIONS EE Economizer FE Fan Exhaust MB Mixing Box _F Filter Segment CC Cooling Coils Supp
26. access and tampering with unit setpoints and con figuration A single terminal strip shall be provided for all thermo stat and customer hard wired field connections Unit controls shall be completely factory packaged and compatible with a room thermostat Constant volume units shall operate with a two 2 cool two 2 heat ther mostat Staging decisions shall be based upon the de viation of space temperature from set point and the rate of change of the space temperature VAV units shall operate with a sensor in the supply air stream for cooling operation Staging decisions shall be based upon the deviation of supply air temperature from set point and the rate of change of the supply air temperature Controllers shall have the following safeties both VAV and CV High and low pressure cut outs one each refriger ant circuit Minimum on time for compressors Delay between compressor stages Anti short cycle delays minimum off time for com pressors and supply fan Cooling lockout at 40 F 0 F if equipped for low ambient operation Airflow proving switch requiring proper air flow for cooling operation 40 ACCESSORIES AND OPTIONS Full perimeter and partial perimeter roof curbs 14 high roof curb with wood nailer Roof curb covers the entire perimeter of the unit full curb or that portion of the unit that has airflow partial curb Supply Fan VFD Manual Bypass provides full air flow in the event
27. and or local code requirements Minimum Circuit Ampacity MCA is based on U L Standard 1995 Section 36 14 N E C Section 440 34 Maximum Dual Element Fuse size is based on U L Standard 1995 Section 36 15 N E C Section 440 22 Use copper conductors only On units with an optional disconnect switch the supplied disconnect switch is a Disconnecting Means as defined in the N E C Section 100 and is intended for isolating the unit from the available power supply to perform maintenance and troubleshooting This disconnect switch is not intended to be a Load Break Device FIG 3 SINGLE POINT POWER SUPPLY WIRING WITH NON FUSED DISCONNECT 32 YORK INTERNATIONAL FORM 100 50 1 Field Power Supply 2 Field Power Supply 1 NOTES T m DUAL POINT POWER SUPPLY WIRING Electrical Controls Box Power Side Control Side TB2 TB1 Jaa 6 233 e Field Control Wiring Terminal Block LD06416 Ground Line 1 Line 2 Line 3 Earth Ground All field wiring must be provided through a field supplied fused disconnect switch to the unit terminals or optional molded disconnect switch All electrical wiring must be made in accordance with all N E C and or local code requirements Minimum Circuit Ampacity MCA is based on U L Standard 1995 Section 36 14 N E C Section 440 34 Maximum Dual Element Fuse size is based on U L Standard 1
28. bient Lockout temperature is typically low enough that me chanical cooling will rarely be required However for some applications mechanical cooling is required when the Outside Air temperature is lower than the Low Am bient Lockout temperature 28 For these applications the unit can be equipped with optional Low Ambient controls For optional Low Ambi ent operation the OptiLogic controller monitors the refrigeration system discharge pressure and controls the speed of the condenser fans If the discharge pres sure falls the speeds of the condenser fans are re duced to maintain acceptable condensing pressures in the refrigeration system With the optional Low Ambi ent controls mechanical cooling is allowed down to Outside Air temperatures of 0 F SMOKE PURGE SEQUENCES General As a convenience for when buildings catch fire or the building is inundated with smoke or fumes from manu facturing processes etc the OptiLogic control sys tem provides one of five ventilation override control se quences for building purge The five selectable purge sequences are Shutdown Pressurization Exhaust Purge and Purge with duct pressure control Note when any of the purge sequences are activated cooling and heating modes are disabled A contact closure is pro vided which indexes the OptiLogic controller into the selected purge sequence Shutdown When this purge sequence is selected and activated the supply and exha
29. ccupied mode of operation This Unoccupied Override feature is fully configurable via the OptiLogic user interface 26 ECONOMIZER OPERATION The unit can be equipped with one of three types of optional economizers dry bulb single enthalpy or com parative enthalpy When the unit controller determines that Outside Air is suitable for economizing the unit controller will control the outside air damper s open to provide economizer cooling If economizer cooling alone is insufficient for the cooling load the unit controller shall stage up compressors one at a time to meet demand The control logic for the three types of economizers is as follows Dry Bulb Economizer The dry bulb economizer is the default economizer con trol scheme With the dry bulb economizer the unit con troller monitors the Outside Air temperature only and compares it to a reference temperature setting Outside Air is deemed suitable for economizing when the Out side Air temperature is determined to be less than the reference temperature setting This method of econo mizing is effective but is prone to some changeover in efficiencies due to the fact that this method is based on sensible temperatures only and does not take Outside Air moisture content into consideration Single Enthalpy Economizer With the optional single enthalpy economizer the unit controller monitors the Outside Air enthalpy in addition to the Outside Air temperature and compar
30. ctrical sizing for your unit All concurrent load conditions must be considered in the calculations and you must use the highest value for any combination of loads Load Definitions LOAD1 is the current of the largest motor com pressor or fan motor LOAD2 is the sum of the remaining motor currents that may run concurrently with LOAD1 i e fan motor TABLE 9 COMPRESSORS COMPRESSOR LOADS is the current of the electric heaters zero for cooling only units LOADA is the sum of any remaining currents greater than or equal to 1 0 amp Use the following calculations to determine MCA and MOP for units supplied with a single point power connection MCA 1 25 x LOAD1 LOAD2 LOAD4 MOP 2 25 x LOAD1 LOAD2 LOAD4 If the MOP does not equal a standard current rating of an overcurrent protective device then the marked maxi mum rating is to be the next lower standard rating How ever if the device selected for MOP is less than the MCA then select the lowest standard maximum fuse size greater than or equal to the MCA NOMINAL VOLTAGE Values shown are per compressor 24 575V RLA LRA 19 4 120 0 19 4 120 0 22 3 140 0 22 3 140 0 YORK INTERNATIONAL FORM 100 50 1 TABLE 10 SUPPLY AND EXHAUST FAN MOTOR OR TEFC High Efficiency NOMINAL VOLTAGE MOTOR 208V 230V 460V 575V HP FLA FLA FLA FLA 5 0 5 3
31. dden more open by the unit controller when Outside Air conditions are suitable for economizing YORK INTERNATIONAL FORM 100 50 EG1 Demand Ventilation If an optional CO2 sensor is connected to the unit the unit controller can reset the minimum OA damper position s or minimum flow rate based on demand The unit controller shall monitor the CO2 level within the building If the CO2 level rises above the CO2 setpoint the controller will temporarily increase the Minimum OA Damper Position or Minimum OA flow rate to increase ventilation If the CO2 level drops below the 2 set point the controller will decrease the Minimum OA Damper Position or Minimum OA flow rate to decrease ventilation Demand Ventilation shall remain active as long as the unit is in the Occupied mode of operation EXHAUST CONTROL SEQUENCES Barometric The optional barometric exhaust system consists of a lightweight barometric relief damper installed on the end of the unit in the Return Air section As more outside air is introduced into the controlled zone due to Econo mizer and Ventilation control sequences the pressure inside the building rises This increase in building pres sure forces the barometric relief damper open to allow exhaust air to escape Because this type of exhaust system is not powered it is limited to small amounts of exhaust Powered Fixed Volume Exhaust Based on Outside Air Damper Position This optional fixed volume powered
32. dulating damper arrangements Modulating damper economizers shall have outdoor air and return air dampers that are interlocked and posi tioned by fully modulating solid state damper actua tors The actuators shall be spring loaded so that the outside air damper will close when power to the unit is interrupted The operation of the modulating economizer shall be fully integrated into the cooling control system The modulating economizer control shall be via a dry bulb sensor single or dual enthalpy sensors Airflow Measurement airflow measurement is avail able for the Modulating Damper Economizer option listed above Three options exist for airflow measure ment minimum airflow and 100 air flow Minimum airflow measures airflow between 0 and the minimum ventilation airflow up to 25 outside air 100 airflow measurement measures air flow from 0 100 of the outside airflow RELIEF SYSTEM Barometric Relief building air exhaust shall be ac complished through barometric relief dampers installed in the return air plenum The dampers will open relative to the building pressure Exhaust Air Fans two 2 forward curved centrifugal fans shall be installed in the return air plenum for posi tive power exhaust Fan impellers shall be on a com mon shaft driven by a single motor The fans motors and drives shall be of the same quality and design as specified for the supply air fan except the fans shall be Class Exhaust control opt
33. e gross cooling capacity YORK INTERNATIONAL Fan Performance TABLE 6 50 THROUGH 65 TON SUPPLY FAN DATA TOTAL STATIC PRESSURE inches of water column CFM STD AIR HP 10000 12000 14000 9 1 16000 11 2 17500 13 1 18000 13 8 19250 15 5 20000 16 6 21000 18 3 22000 20 0 22500 20 9 24000 23 8 26000 28 3 27000 30 9 TABLE 6 50 THROUGH 65 TON SUPPLY FAN DATA CONT D TOTAL STATIC PRESSURE inches of water column CFM 6 00 STD AIR RPM HP 10000 12000 14000 16000 17500 575 17 3 18000 766 23 0 19250 765 25 0 20000 764 26 1 21000 769 28 2 22000 773 30 4 22500 776 31 5 24000 783 35 1 26000 798 40 5 27000 802 43 1 20 YORK INTERNATIONAL FORM 100 50 1 TABLE 7 50 THROUGH 65 EXHAUST FAN DATA TOTAL STATIC PRESSURE inches of water column CFM STD AIR 10000 12000 14000 16000 18000 20000 YORK INTERNATIONAL 21 Fan Performance continued TABLE 8 COMPONENT STATIC PRESSURE DROPS INCHES OF WATER COLUMN EVAPORATOR SUPPLY RETURN AIR FILTERS size FLOW COILS OPENING OPENING 2 A 2 B THROW CLEAN PLEAT CARBON DRY LEFT RIGHT BOTTOM REAR SIDES AWAY ABLE ED 0 08 0 11 0 14 0 16 0 19 0 19 0 22 0 24 0 26 0 26 0 11 0 14 0 1
34. e unit controller when Outside Air con ditions are suitable for economizing Minimum OA Damper Position VAV Units With Variable Air Volume units there are two Minimum OA Damper Positions one when the unit is at full speed and the second when the unit is at approximately half speed These two points allow the control to linearly reset the position of the OA damper in response to fan speed When the unit goes into the Occupied mode of opera tion the unit controller shall monitor the speed of the supply fan and open the Outside Air damper to a calcu lated minimum position based on the fan speed This minimum position shall vary as the speed of the fan changes The damper shall remain at this calculated position as long as the unit is in the occupied mode The minimum position may be overridden more open by the unit controller when Outside Air conditions are suitable for economizing Air Measurement Stations When the unit is equipped with an air measurement station the unit controller shall control the Outside Air damper to a measured flow rate through the Air Mea surement Station When the unit goes into the Occupied mode of opera tion the unit controller shall control the Outside Air damper to maintain the Minimum AirFlow Setpoint through the Air Measurement Station The unit control ler shall control the Outside Air damper to this flow rate as long as the unit is in the Occupied mode The Out side Air damper may be overri
35. ea where it is discharged as compressed gas High efficiency is achieved through a precisely controlled orbit and the use of advanced scroll geometry There is no wasted motion All rotating parts are statically and dynamically balanced to ensure opti mal performance over the long haul Balanced components and precision machining also ensure that smooth compression occurs in all involute pockets simultaneously When compression forces are equally distributed over the entire scroll surface equal forces in opposing directions cancel one another mini mizing any imbalance Consequently compression is smooth continuous and quiet Vibration isolators on each compressor handle normal vibration For extra quiet operation acoustic sound blankets for each com pressor are available as options YORK INTERNATIONAL Serviceability e OptiLogic fully integrated factory packaged controls are standard on every unit and include a display unit with a 4x20 character LCD display OptiLogic continually monitors all control setpoints and configurations If a unit or control component or sensor fails the controller notifies the user of a problem If desired YORK service can provide re mote monitoring and automatically schedule a ser vice technician to make the repair and maintain your comfort Access doors full sized access doors provide easy access into the unit for routine maintenance and inspection Suction amp discharge
36. ended Addition ally the slab should not be tied to the main building foundation as noises may be transmitted into the build ing structure For ground level installations precautions should be taken to protect the unit from tampering by or injury to unauthorized persons Erecting a fence around the unit is another common practice ECONOMIZER The economizer section is used for ventilation of the conditioned space to maintain indoor air quality and also to reduce energy consumption by using outdoor air cooling in lieu of mechanical cooling If outdoor air is appropriate for cooling but not sufficient for the cool ing demand mechanical cooling will stage on as nec essary until the cooling load is met Comparative enthalpy operation is the most accurate and efficient means of economizer operation The OptiLogic control monitors the return and outside air energy con tent and selects the lower of the two for operation VAV SUPPLY AIR PRESSURE CONTROL Traditional packaged rooftop systems use inlet guide vanes IGVs for duct static pressure control These con trol supply duct pressure by modulating dampers intro ducing losses and inefficiencies on the intlet of the fan open and closed Variable frequency drives VFDs of fer superior fan speed control and quieter energy effi cient operation IGV inefficiency can be compared to the operation of a car Modulating air flow with an IGV is like pressing on the gas to dri
37. enings The rain hoods on the sides of the unit shall be rotated into the cabinet and secured for shipment so that upon installation they need only be rotated upwards and screwed into place The outside air hood shall contain a removable and cleanable filter All damper assemblies shall be of low leak design Damper blades shall be fabricated from a minimum of 16 gauge galvanized steel REFRIGERATION SYSTEM Units shall have four compressors for maximum load matching capability Each refrigerant circuit shall be controlled with a thermal expansion valve for maximum control at low load conditions Evaporator Coils Evaporator coils shall be direct expansion Coil tubes shall be 3 8 OD copper with internally enhanced tubes Fins shall be enhanced aluminum mechanically ex panded to bond with the copper tubes Coil casing shall be fabricated from heavy gauge galvanized steel A stainless steel double sloped drain pan shall be pro vided under the entire width of the evaporator coil in cluding all return bends The main drain pan shall be sloped a total of 1 4 per foot towards the drainage point according to ASHRAE 62 guidelines Main drain pan shall be accessible and cleanable in the field The con YORK INTERNATIONAL densate drain opening shall be flush with the bottom of the drain pan to allow complete drainage Coils in ex cess of 48 high shall have an intermediate drain pan extending the entire width of the coil to p
38. es and 20 gauge on the interior Interior floor panels shall be 18 gauge All serviceable sections shall have hinged access doors with latches on both sides of the unit All access doors shall be constructed of 20 gauge steel on the outside with 24 gauge on the inside Each door shall seal against PVC gaskets to prevent air and water leakage The roof shall be double wall with 18 gauge on the external surface and 24 gauge on the interior The roof shall be formed with a 45 degree drip lip overhanging the side walls to prevent precipitation drainage from streaming down the side of the unit Roof sections shall be connected together via integral channels fastened with screws and sealed with gasketing Each fastened seam shall be further protected by a sheet metal chan nel covering the full length of the gasket surface mak ing a completely water tight seal SUPPLY AIR SYSTEM Supply Air Fan Fans shall be centrifugal type statically and dynami cally balanced in the factory Fan wheels shall be de signed for continuous operation at the maximum rate of fan speed and motor HP Fans shall be double width double inlet with forward curved blades The fan and motor assembly shall be mounted on a common base to allow consistent belt tension with no relative motion between the fan and motor shafts The entire assembly shall be isolated from the unit base with 1 deflection springs The fan discharge shall be connected to the cabinet throug
39. es it to a reference enthalpy setting and a reference tempera ture setting Outside Air is deemed suitable for econo mizing when the Outside Air enthalpy is determined to be less than the reference enthalpy setting and the Out side Air temperature is less than the reference tem perature setting This method of economizing allows the reference temperature setting to be set higher than the DB Economizer and is consequently a more effi cient packaged rooftop economizer Comparative Enthalpy Economizer With the optional comparative enthalpy economizer the unit controller monitors and compares the Outside Air and Return Air enthalpies in addition to comparing the Outside Air temperature to the reference temperature setting Outside Air is deemed suitable for economiz ing when the Outside Air enthalpy is determined to be YORK INTERNATIONAL less than the Return Air enthalpy and the Outside Air temperature is less than the reference temperature set ting This method of economizing is the most accurate and provides the highest degree of energy efficiency for a packaged rooftop economizer VENTILATION CONTROL SEQUENCES Minimum OA Damper Position CV Units When the unit goes into the Occupied mode of opera tion the unit controller shall open the Outside Air Damper to a fixed minimum position The damper shall remain at this position as long as the unit is in the occu pied mode The minimum position may be overridden more open by th
40. exhaust system consists of a fixed speed fan that is controlled ON and OFF based on the position of the Outside Air Damper During operation when the Outside Air Damper opens to a selected turn on point the Exhaust Fan is cycled ON The fan remains on as long as the Outside Air damper is above a selected turn off point If the Out side Air Damper closes to the selected turn off point the Exhaust Fan is cycled OFF The turn on and turn off points are user selectable from the OptiLogic User Interface panel Powered Fixed Volume Exhaust Based on Building Pressure This optional fixed volume powered exhaust system consists of a fixed speed fan that is controlled ON and OFF based on the pressure inside the building During 27 Controls continued operation the pressure within the building in monitored by the OptiLogic controller If the pressure rises to or above a selected turn on pressure the Exhaust Fan is cycled ON The fan shall remain on as long as the pres sure within the building remains above a selected turn off pressure If the building pressure falls to or below the selected turn off pressure the Exhaust Fan is cycled OFF The turn on and turn off pressure setpoints are user selectable from the OptiLogic User Interface Powered Variable Volume Exhaust Discharge Damper Controlled This optional variable volume powered exhaust system consists of a fixed speed fan configured with a propor tionally controlled
41. g F 45 45 45 45 Low Ambient Option Min OA Temp F 0 0 0 0 YORK INTERNATIONAL Application Data FORM 100 50 EG1 LOCATION Of the many factors that can affect the acoustical char acteristics of a rooftop installation one of the most im portant is the unit location Ideally the rooftop unit should be installed away from sound sensitive areas such as conference rooms auditoriums and executive offices Possible locations could be above storage areas hall ways mechanical or utility rooms or bathrooms The eco air conditioning units are designed for out door installation When selecting a site for installation be guided by the following conditions Unit must be installed on a level surface Forthe outdoor location of the unit select a place having a minimum sun exposure and an adequate supply of fresh air for the condenser Also avoid locations beneath windows or between structures Optional condenser coil protection should be used for seashore locations or other harsh environments Theunit should be installed on a roof that is struc turally strong enough to support the weight of the unit with a minimum of deflection Extreme caution should be taken when the unit is mounted on a wood structured roof It is recommended that the unit s be installed not more than 15 feet from a main sup port beam to provide proper structural support and to minimize the transmission of sound and vibra tion
42. h a reinforced neoprene flexible connection to eliminate vibration transmission from the fan to the unit casing BEARINGS AND DRIVES Bearings shall be self aligning pillow block re greasable ball bearings with an average life expectancy L10 of 40 000 hours Grease fittings shall be accessible through access doors Fan motors shall be NEMA designed Standard effi ciency ball bearing type with electrical characteristics and horsepower as specified Motors shall be 1750 RPM open drip proof type The motor shall be located within the unit on an adjustable heavy steel base YORK INTERNATIONAL FORM 100 50 1 fan motor drives shall be selected for minimum service factor of 1 2 and have fixed pitched sheaves AIR FILTERING SYSTEM All filter holding frames shall be of heavy duty construc tion designed for industrial applications All filters shall be either side accessible via access doors on both sides of the filter section All filter media shall be Class II listed under UL Stan dard 900 Filter efficiencies shall be rated in accordance with ASHRAE Standard 52 76 Two inch throwaway filters in an angled filter rack shall be standard On units with rigid filters two inch prefilters shall be installed upstream of the rigid filters AIR INLET SYSTEM General A factory installed outside air rain hood permanently attached to the cabinet to prevent windblown precipita tion from entering the unit shall cover inlet op
43. he duct system Flexible collars should be used when connect ing the duct work to prevent unit noise transmission and vibration into the building Duct work should be supported independently of the unit ACOUSTICAL CONSIDERATIONS The unit is designed for lower sound levels than competitive units by using flexible fan connections fan spring isolators double wall construction and lower speed and horsepower fans For VAV applications VFDs are used instead of inlet guide vanes Additional sound attenuation can be obtained using compressor sound blankets and field supplied sound attenuators when necessary Even with these equipment design features the acous tical characteristics of the entire installation must never be overlooked Additional steps for the acoustical char acteristics of a rooftop installation should be addressed during the design phase of a project to avoid costly al terations after the installation of the equipment During the design phase of a project the designing engineer should consider at a minimum the impact of the equip ment location rooftop installation building structure and duct work SELECTION PROCEDURE Given Required total cooling capacity of 600 mbh and sen sible cooling capacity of 450 mbh with evaporator en tering air conditions of 83 F dry bulb and 67 F wet bulb Design ambient temperature is 95 F dry bulb Supply air requirements are 17500 cfm of air at 2 25 IWG ex ternal
44. ial loca tions This can provide corrosion resistance comparable to copper fin coils in typical seashore locations Post Coated Condenser Fins Technicoat a post coated application of epoxy can be used for seashore and other corrosive applications with the exception of strong alkalides oxidizers wet bro mide chlorine and fluorine in concentrations greater than 100 ppm Any of the above suitable options should be selected based on the particular project design parameters and related environmental factors The application should be further reviewed and approved by the consulting en gineer or owner based on their knowledge of the job site conditions 10 BUILDING EXHAUST SYSTEMS Building exhaust systems are often necessary when economizers are used to bring in outdoor air Without proper building exhaust the building may become over pressurized The exhaust system maintains the proper building pressure by expelling the appropriate amount of air from the building Exhaust systems are typically designed to exhaust approximately 1096 less air than what is entering the building This provides a slight posi tive pressure on the building 10096 modulating exhaust with building static pressure sensing and control The 100 exhaust system can be configured with ei ther control actuated dampers or VFDs for modulating control The unit controller monitors the building pres sure using a differential pressure transducer and main tai
45. ions are on off modulating discharge damper or VFD fan speed control On units with non modulating exhaust a barometric relief damper is included to prevent outside air from entering in the off cycle Fans shall cycle on and off with building pres sure On units with modulating exhaust and two posi tion control based on building pressure a field installed static pressure sensor mounted in the conditioned space or return air duct is required for damper and VFD modulation YORK INTERNATIONAL EVAPORATOR COIL PROTECTION Copper Fins provided in lieu of aluminum fins Pre Coated Fins epoxy coated aluminum fin stock to guard from corrosive agents and insulate against gal vanic potential Used for mild seashore or industrial locations CONDENSER COIL PROTECTION Copper Fins provided in lieu of aluminum fins Pre Coated Fins an epoxy coated aluminum fin stock to guard from corrosive agents and insulate against gal vanic potential Used for mild seashore or industrial locations Post Coated Fins Technicoat coil coating process used on condenser coils for seashore and other corro sive applications with the exception of strong alkalis oxidizers wet bromide chlorine and fluorine in concen trations greater than 100ppm Hot Gas Bypass Optional on Constant Volume Standard on VAV permits continuous stable opera tion at capacities below the minimum step of unloading by introducing an artificial load on
46. ll electrical wiring must be made in accordance with all N E C and or local code requirements Minimum Circuit Ampacity MCA is based on U L Standard 1995 Section 36 14 N E C Section 440 34 Maximum Dual Element Fuse size is based on U L Standard 1995 Section 36 15 N E C Section 440 22 Use copper conductors only On units with an optional disconnect switch the supplied disconnect switch is a Disconnecting Means as defined in the N E C Section 100 and is intended for isolating the unit from the available power supply to perform maintenance and troubleshooting This disconnect switch is not intended to be a Load Break Device m FIG 2 SINGLE POINT POWER SUPPLY WIRING YORK INTERNATIONAL 31 Power Wiring continued SINGLE POINT POWER SUPPLY WIRING WITH NON FUSED DISCONNECT Electrical Controls Box Power Side Control Side Molded mm 9 Case 312216 Disconnect elelelle Switch Field Control Wiring Terminal Block 1006415 Line 1 0 Field Power Line 2 oto di Supply Line 3 oto Earth gt Ground NOTES 1 All field wiring must be provided through a field supplied fused disconnect switch to the unit terminals or optional molded disconnect switch All electrical wiring must be made in accordance with all N E C
47. ly Fan DP Discharge Plenum CO Condenser Section CP Control Panel T 02 5 13 16 6 1 2 REAR VIEW gt 1006418 jesaua q IVNOILLVNHALLNI N FIG 8 CURB LAYOUT DRAWING NOTES 1 CURB NAILER amp GASKET ONLY FURNISHED BY YORK ALL OTHER PARTS ARE FURNISHED AND INSTALLED BY OTHERS 2 ROOF CURB SHIPPED IN PIECES FOR FIELD ASSEMBLY 3 ROOF CURB MUST BE INSTALLED SQUARE AND LEVEL 4 CURB MATERIAL IS 14 GAUGE GALVANIZED NOT PAINTED 5 CURB INSULATED WITH 1 5 3 INSULATION LD06419 qang DUIMBI 09 09001 WHOS Guide Specifications GENERAL Units shall be designed for outdoor rooftop installation on a roof curb Units shall be rated according to ARI 360 Units shall be shipped in a single package fully charged with HFC 407C refrigerant The manufactur ing facility shall be registered under ISO 9001 Quality Standards for Manufacturing All units shall be com pletely factory assembled and run tested Units shall be ETL listed and be tested according to UL 1995 Tags and decals to aid in the service or indicate caution areas shall be provided Installation operation and maintenance manuals shall be supplied with each unit Units shall be capable of providing mechanical cooling down to 45 F 0 F with a low ambient kit Unit shall be capable of starting and r
48. ns the required building static pressure by modulat ing the exhaust control If the building has other means of exhaust or building pressure is not important on off or barometric control may be used 100 modulating exhaust with fan on off control The 10096 exhaust system can be configured for on off operation eliminating the expense of the damper ac tuators or VFDs This exhaust system can be controlled by either the outside air damper position or a building static pressure sensor Barometric exhaust Barometric exhaust can be used when smaller amounts of air at low static pressure variations within the build ing or other means of building exhaust are employed Barometric exhaust is commonly used where there are only small fluctuations in building pressure or where building static pressure control is not necessary ROOF CURB Optional 14 inch full perimeter or open condenser roof curbs can be provided if necessary for mounting to the building roof These curbs come disassembled and require installation in the field For bottom supply and return duct openings the curbs have matching con nections to ease installation A pipe chase that matches the rooftop unit is also included in the curb footprint for through the curb utility connections YORK INTERNATIONAL FORM 100 50 1 The curb should be located according to the location recommendations above and properly sealed to pre vent moisture and air leakage into and out of t
49. om pressors up and down as required to maintain the VAV Low SAT Setpoint CV SPECIFIC SEQUENCES Cooling Operation Thermostat Control If a 7 wire thermostat 2 Cool 2Heat controls the unit all zone temperature setpoint control is maintained at the thermostat With this operation the unit remains idle until it receives a stage call from the Thermostat If is called from the thermostat the Supply Fan will start and all occupied functions if equipped i e venti lation economizer etc will be allowed to operate Stage 1 Y1 Call If Y1 is called and the unit is equipped with an econo mizer the control will check to see if the Outside Air is suitable for economizing If conditions are suitable for economizing the control will control the economizer and stage up compressors as required to maintain a high 30 SAT setpoint If conditions are not suitable for econo mizing or not equipped with an economizer the control will stage up 50 of the compressors This shall be maintained until Stage 1 is deactivated or Stage 2 is called Stage 2 2 Call If Y2 is called and the unit is equipped with an econo mizer the control will check to see if the Outside Air is suitable for economizing If conditions are suitable for economizing the control will control the economizer and stage up compressors as required to maintain a LOW SAT setpoint If conditions are not suitable for econo mizing or not e
50. quipped with an economizer the control will stage up 10096 of the compressors This shall be maintained until Stage 2 is deactivated Zone Sensor Control If a zone sensor controls the unit the OptiLogic con troller shall maintain all zone temperature setpoints These setpoints are user selectable at the OptiLogic User Interface When zone sensor is used for control the OptiLogic unit controller will monitor the temperature within the space and control the unit accordingly A closed loop staging algorithm is used to stage compressors up and down as required to maintain the desired zone tempera ture setpoint If the unit is equipped with an economizer Outside Air conditions are continuously monitored by the control to determine if conditions are suitable for econo mizing If conditions are suitable for economizing the OptiLogic controller will modulate the Outside Air damper in addition to staging compressors up and down to maintain the zone temperature setpoint YORK INTERNATIONAL FORM 100 50 EG1 Power Wiring SINGLE POINT POWER SUPPLY WIRING Electrical Controls Box Power Side Control Side 1L1 1L2 1L3 GND Field Control Wiring Terminal Block LD06414 Line 1 Field Power Line 2 Sm Ground NOTES 1 All field wiring must be provided through a field supplied fused disconnect switch to the unit terminals or optional molded disconnect switch A
51. rier and moisture indicating sight glass Each circuit shall also have both high and low pressure switches installed on either side of the compressor and include access fittings for replacement of the pressure switches without removing charge Polyurethane sleeves shall protect all small diameter distributor tubing to the evaporator coil to prevent the tubes from copper to copper contact during shipment or operation POWER SUPPLY Unit power supply shall be 460V 3 phase 60 2 208 230 and 575V optional single point power connections with terminal block connections 39 Guide Specifications continued CONTROLS A factory mounted unit controller with a 4x20 character alphanumeric display and user keypad shall be included as standard The controller and keypad shall be housed inside the low voltage compartment of the control power panel On units with supply or exhaust VFDs the VFD keypads shall be located inside the same panel as the unit controller and interface keypad Control operating data setpoints unit setup configuration service and history shall all be accessible via a single key A sys tem alarm LED shall indicate failures to the operator with more detail provide in the menu screens The user interface shall function with a simple menu driven dis play for easy access to unit data with integral time clock for weekly and holiday scheduling The unit keypad shall include password protection to prevent unautho rized
52. rovide better water drainage Compressors Compressors shall be hermetic scroll type including tip seals to provide efficient axial sealing while prevent ing scroll tip to base contact controlled orbit design for radial sealing to incorporate minimum flank to flank con tact for long service life refrigerant cooled motors large suction side free volume and oil sump to provide liquid handling capability annular discharge check valve and reverse vent assembly to provide low pressure drop silent shutdown and reverse rotation protection initial oil charge oil level sight glass vibration isolator mounts for compressors and brazed type connections for fully hermetic refrigerant circuits Condenser Coils Condenser coils shall have 3 8 seamless copper tubes arranged in staggered rows mechanically expanded into aluminum fins Coils shall be protected from hail dam age with a V configuration with individual flat coils ro tated from the vertical plane for each condensing circuit Condenser Fans and Motors Condenser fans shall be direct drive propeller type discharging vertically Condenser fan motors shall be 3 phase totally enclosed air over TEAO Thermal overload protection shall be provided for each con denser fan motor Refrigerant Piping All interconnecting piping between refrigeration com ponents shall be copper tubing with brazed joints Each refrigerant circuit shall be equipped with liquid line filter d
53. service valves oversized service valves to provide isolation and quick recla mation and charging of system refrigerant are avail able to minimize downtime and simplify the service and repair task VFD Fan Motor Control with Manual Bypass Optional manual VFD bypass reduces time required for troubleshooting commissioning and system balancing Convenience Outlet for maintenance tasks re quiring power tools an optional 110V GFCI power supply can power lights drills or any other power hand tool needed Filter Maintenance Alarm An optional filter main tenance alarm indicates when a filter becomes dirty and requires replacement or cleaning Install with Ease and Safety Factory run tested Each unit is subjected to a series of quality assurance checks as well as an automated quality control process before being run tested Fans and drives are balanced at the factory during testing The factory run test ensures safe proper operation when the unit is installed and re duces installation and commissioning time Single point power connection Single point power connection reduces installation time by pro viding a single point for incoming power including Introduction the optional convenience outlet Allincoming power is connected in one location reducing the cost of field supplied and installed power wiring Factory mounted and wired controls All con trol points within the unit are factor
54. steel drain pan This double sloped inclined stainless steel drain pan fa cilitates removal of evaporator condensate Sloped 00406VIP in two directions conforming to ASHRAE 62n this drain pan swiftly minimizes any condensate within the unit Best of all the drain pan is accessible for periodic cleaning required by IAQ standards Smart ventilation YORK maintains the leader ship role in IAQ products with adaptive ventilation control The OptiLogic controls provide continu ous monitoring of air quality and take action by open ing the outside air dampers bringing in the right amount of fresh air before air impurities reach un comfortable or even dangerous levels Air flow measurement Precise measurement of ventilation air flow is possible using an air flow measurement station which can be installed in the economizer section Proper ventilation air flow is required to ensure sufficient fresh air is in the build ing A myriad of air flow measurement options are available from minimum air flow to high accuracy full air flow capabilities The complete system is designed as an integrated component of the OptiLogic control system to ensure optimum sys tem performance Double wall construction Rigid double wall construction throughout provides ease of clean ing and protects against insulation fiber entrain ment in the breathable air Double wall construc tion also helps improve the acoustical character istics of
55. ted the Supply Fan is cycled ON and controlled to maintain the duct static pressure setpoint The Exhaust Fan is also controlled ON Exhaust Damper driven full open and the Outside Air Damper is driven full open This mode is maintained until the smoke purge input is de activated and the unit returns to normal operation VAV SPECIFIC SEQUENCES Supply fan operation For VAV units the supply fan is controlled ON and OFF based on the occupancy state or the G input from a Thermostat Unit must be configured for Thermostat operation to respond to the G input When the unit goes into the Occupied mode of operation or is called the Supply Fan will be controlled ON The OptiLogic controller will monitor the static pressure within the supply duct system and control the speed of the supply fan to maintain a specified Duct Static Pres sure setpoint A Variable Frequency Drive VFD is used on all VAV units to vary the speed of the supply fan Note the use of a VFD in lieu of inlet guide vanes pro vides for higher energy efficiency for the unit by elimi nating the losses air pressure drop typical of inlet guide vane systems COOLING OPERATION Thermostat Control When a VAV unit is configured for thermostat opera tion the OptiLogic controller will command the Sup ply Fan to start when the unit goes into the Occupied mode or a thermostat signal is received by the con trol With no thermostat calls for cooling
56. the evaporator BACNet Communications Card for BAS commu nications a BACNet card is available with Ethernet connection Compressor Sound Blankets compressor acoustic sound blankets for sound sensitive applications CO Sensors carbon dioxide sensors for occupied space that operate demand ventilation control opening outside air dampers to ventilate building Suction and Discharge Pressure Transducers moni tor and readout of suction and discharge pressures 41 42 NOTES YORK INTERNATIONAL YORK INTERNATIONAL NOTES FORM 100 50 EG1 43 3YORK OSO Jr SES 36USC380 P O Box 1592 York Pennsylvania USA 17405 1592 Tele 800 861 1001 Subject to change without notice Printed in USA Copyright by York International Corporation 2001 www york com ALL RIGHTS RESERVED Form 100 50 EG1 201 New Release
57. unning at 120 F Unit electric and gas connections shall be either through the curb or the side of the unit CONSTRUCTION Base The base rail shall be constructed of 12 gauge galva nized steel extending the full perimeter of the unit All components shall be supported from the base and the base shall include integral lifting lugs The unit base rail shall overhang the roof curb for water runoff and shall have a fabricated recess with a continuous flat surface to seat on the roof curb gasket providing a positive weather tight seal between the unit and the curb Casing The unit cabinet shall be double wall construction to provide both maximum resistance to bacterial growth in the air stream and superior structural integrity All sheet metal shall be G90 mill galvanized sheet metal formed and reinforced to provide a rigid assembly Cabi net shall be coated with baked on powder paint which when subject to ASTM B117 500 hour 5 salt spray test yields minimum ASTM 1654 rating of 6 The unit shall be insulated with 1 1 2 1 pound fiberglass insu lation between the two sheet metal skins Insulation shall meet NFPA 90A regulations for smoke and flame spread ratings Single wall units or foil faced insula tion in the air stream shall be not acceptable The cabinet corner post and the intermediate side sup ports shall be a minimum of 16 gauge steel All access 38 doors shall be a minimum of 18 gauge on the exterior surfac
58. ust fans are controlled OFF and the Outside Air damper is overridden closed This idle state is maintained until the purge input is deactivated and the unit returns to normal operation Pressurization When this purge sequence is selected and activated the exhaust fan is controlled OFF and the Supply Fan is controlled ON The Outside Air damper is opened full and the Return Air Damper is closed full If the unit is a VAV unit the VAV boxes are also driven full open to prevent duct over pressurization This mode is main tained until the smoke purge input is deactivated and the unit returns to normal operation Exhaust When this purge sequence is selected and activated the Supply Fan is controlled OFF and the Exhaust Fan is controlled ON Exhaust Damper driven full open This mode is maintained until the smoke purge input is deactivated and the unit returns to normal operation YORK INTERNATIONAL FORM 100 50 1 When this purge sequence is selected and activated the Supply Fan is controlled ON and the Exhaust Fan is controlled ON The Outside Air damper is opened full and the Return Air damper is closed full If the unit is a VAV unit the VAV boxes are also driven full open to prevent duct over pressurization This mode is main tained until the smoke purge input is deactivated and the unit returns to normal operation Purge With Duct Pressure Control VAV Only When this purge sequence is selected and activa
59. ve the car but modulating the speed of the car by simultaneously pressing on the brake VFD modu lation is speed modulation by using just the gas pedal Application Data continued For applications the YORK eco unit uses a VFD to modulate fan speed and maintain a constant duct static pressure VFDs offer superior control over the operation of the unit at part load and offer the addi tional benefits of quieter and more efficient operation when compared to IGV HARSH ENVIRONMENTS CONDENSER AND EVAPORATOR COIL PROTECTION For harsh environmental conditions such as seashore applications YORK offers three types of coil protec tion copper fin material black fin and Technicoat coat ings YORK recommends that for corrosive environ ments that copper fins be used to protect the evapora tor and or condenser coils In areas where chemicals that can corrode copper are present such as ammo nia YORK recommends that the black fin or Technicoat coating be used for maximum protection Copper Fin Condenser Coil Copper fins can be used instead of aluminum for addi tional corrosion protection however it is not suitable for areas that are subject to acid rain or exposed to ammonia Pre Coated Condenser Fins Black fin coating yellow fin for evaporator fins is pre coated application epoxy on aluminum fin stock to guard from corrosive agents and insulate against galvanic po tential It is used for mild seashore or industr
60. y installed wired and tested The OptiLogic controls can commu nicate with BACNet IP Non fused disconnect factory installed non fused disconnect switch simplifies unit installation and serviceability by reducing installed labor costs The disconnect switch is interlocked with the power cabinet ensuring that all power to the unit has been disconnected before servicing Design Flexibility Low Ambient Operation Head pressure control is accomplished via a VFD motor controller rather than an inefficient and noisy condenser fan damper By varying the speed of the condenser fan better control and quieter operation is obtained during the colder months Low ambient controls are available on all systems offering higher rooftop cooling ca pacity than competitive units Hot Gas Bypass Optional on constant volume units hot gas bypass reduces the cycling of compressors which helps prolong the life of the equipment Supply Air Openings Side supply connections are available on select configurations offering more flexibility for duct layout and improving sound trans mission characteristics Compressor Sound Blankets For applications in sound sensitive areas compressor sound blan kets are available to reduce sound emitted from the rooftop unit Fan Spring Isolators One inch spring isolation is used to prevent vibration transmission from the rooftop unit s supply fan to the building Two inch spring isolation
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