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York R-407C manual Electrical Data, Electrical Service Sizing, Load Definitions

Models: R-407C

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Electrical Data

ELECTRICAL SERVICE SIZING

In order to use the electrical service required for the cooling only Eco2 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 electrical 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., exhaust fan motor).

TABLE 9 – COMPRESSORS

•LOAD3 is the current of the electric heaters – zero for cooling only units.

•LOAD4 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.

	COMPRESSOR						NOMINAL VOLTAGE
	QUANTITY		208V			230V			460V				575V
	PER	MODEL	208V			230V			460V				575V
MODEL	PER	MODEL
MODEL	UNIT		RLA*		LRA*	RLA*		LRA*	RLA*		LRA*	RLA*		LRA*
	UNIT		RLA*		LRA*	RLA*		LRA*	RLA*		LRA*	RLA*		LRA*

50	4	SZ160	54.0		265.0	48.8		265.0	24.2		135.0	19.4		120.0

55	4	SZ160	54.0		265.0	48.8		265.0	24.2		135.0	19.4		120.0

60	4	SZ185	62.3		380.0	56.3		380.0	27.9		175.0	22.3		140.0

65	4	SZ185	62.3		380.0	56.3		380.0	27.9		175.0	22.3		140.0

* Values shown are per compressor

24	YORK INTERNATIONAL

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York R-407C manual Electrical Data, Electrical Service Sizing, Load Definitions

Contents

R-407C OPTIMIZED 50 THROUGH 65 TONS Packaged Rooftop Air Conditioning UnitsTABLE OF CONTENTS TABLESNOMENCLATURE FIGURESBASIC MODEL NUMBER FEATURES/BENEFITS Ecological and Economical Design IntroductionIndoor Air Quality IAQ Serviceability Install with Ease and SafetyReliable Scroll Compressor Technology Design Flexibility IntroductionPhysical Data TABLE 1 - PHYSICAL DATAPhysical Data continued TABLE 1 - PHYSICAL DATA Cont’dApplication Data LOCATIONRIGGING Ground Level LocationsApplication Data continued HARSH ENVIRONMENTS - CONDENSER AND EVAPORATOR COIL PROTECTIONCopper Fin Condenser Coil Pre-Coated Condenser FinsSELECTION PROCEDURE Given ACOUSTICAL CONSIDERATIONSSelect Unit TotalCooling Performance Data - 50 Ton Model 85 AIR ON CONDENSER COIL95 AIR ON CONDENSER COIL 105 AIR ON CONDENSER COIL 115 AIR ON CONDENSER COILTABLE 2 - COOLING PERFORMANCE DATA - 50 TON MODEL CONT’D Cooling Performance Data - 55 Ton Model 85 AIR ON CONDENSER COIL95 AIR ON CONDENSER COIL TABLE 3 - COOLING PERFORMANCE DATA - 55 TON MODEL105 AIR ON CONDENSER COIL 115 AIR ON CONDENSER COILTABLE 3 - COOLING PERFORMANCE DATA - 55 TON MODEL CONT’D Cooling Performance Data - 60 Ton Model 85 AIR ON CONDENSER COIL95 AIR ON CONDENSER COIL TABLE 4 - COOLING PERFORMANCE DATA - 60 TON MODEL105 AIR ON CONDENSER COIL 115 AIR ON CONDENSER COILTABLE 4 - COOLING PERFORMANCE DATA - 60 TON MODEL CONT’D Cooling Performance Data - 65 Ton Model 85 AIR ON CONDENSER COIL95 AIR ON CONDENSER COIL TABLE 5 - COOLING PERFORMANCE DATA - 65 TON MODEL105 AIR ON CONDENSER COIL 115 AIR ON CONDENSER COILTABLE 5 - COOLING PERFORMANCE DATA - 65 TON MODEL CONT’D Fan Performance TABLE 6 - 50 THROUGH 65 TON SUPPLY FAN DATATABLE 6 - 50 THROUGH 65 TON SUPPLY FAN DATA CONT’D TABLE 7 - 50 THROUGH 65 TON EXHAUST FAN DATA Fan Performance continued TABLE 8 - COMPONENT STATIC PRESSURE DROPS INCHES OF WATER COLUMNFILTERS ELECTRICAL SERVICE SIZING Electrical DataLoad Definitions High Efficiency Premium EfficiencyTABLE 10 - SUPPLY AND EXHAUST FAN MOTOR ODP OR TEFC TABLE 11 - CONDENSER FAN MOTORS / EACHUNOCCUPIED / OCCUPIED SWITCHING ControlsCONTROL SEQUENCES FOR ALL UNITS GENERALPowered Fixed Volume Exhaust Based on Outside Air Damper Position Powered Fixed Volume Exhaust Based on Building PressureVENTILATION CONTROL SEQUENCES Minimum OA Damper Position CV Units Minimum OA Damper Position VAV UnitsPowered Variable Volume Exhaust-Discharge Damper Controlled Powered Variable Volume Exhaust-VFD ControlledControls continued LOW AMBIENT OPERATIONPurge Purge With Duct Pressure Control VAV OnlyVAV SPECIFIC SEQUENCES Supply fan operation COOLING OPERATION Thermostat ControlStand Alone Control CV SPECIFIC SEQUENCES Cooling Operation Thermostat ControlStage 1 “Y1” Call Stage 2 “Y2” CallPower Wiring SINGLE-POINT POWER SUPPLY WIRINGField Power Supply Electrical / Controls Box Power SidePower Wiring continued SINGLE-POINT POWER SUPPLY WIRING WITH NON-FUSED DISCONNECTField Power Supply Electrical / Controls Box Power SideDUAL-POINT POWER SUPPLY WIRING Field Power Supply #2 Field Power Supply #1TB2 TB1 Electrical / Controls Box Power SideField Control Wiring 7 Wire ThermostatSpace Sensor CO 2 SensorGeneral Arrangement DrawingBOTTOM SUPPLY BOTTOM RETURNLEFT OR RIGHT REAR RETURNSUPPLY General ArrangementCurb Layout Drawing FIG. 8 - CURB LAYOUT DRAWINGGuide Specifications CONSTRUCTION BaseCasing SUPPLY AIR SYSTEM Supply Air FanPOWER SUPPLY AIR FILTERING SYSTEMAIR INLET SYSTEM General REFRIGERATION SYSTEMGuide Specifications continued ACCESSORIES AND OPTIONSCONTROLS ECONOMIZERSRELIEF SYSTEM EVAPORATOR COIL PROTECTIONCONDENSER COIL PROTECTION Suction and Discharge Pressure Transducers - moniYORK INTERNATIONAL FORM 100.50-EG1 YORK INTERNATIONALProud Sponsor of the U.S. Olympic Team 36USC380Form 100.50-EG1 New Release Tele