York HFC-410A manual Electrical Data, Electrical Service Sizing, Load Definitions, Rla Lra

FORM 100.50-EG5 (108)

Electrical Data

ELECTRICAL SERVICE SIZING

In order to use the electrical service required for the cool- ing-only Eco2 rooftop, use the appropriate calculations listed below from U.L. 1995. Based on the configuration of the rooftop, the calculations will yield different MCA (minimum circuit ampacity), and MOP (maximum over- current 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.

TABLE 16 – COMPRESSOR ELECTRICAL DATA

•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 con- nection:

MCA = (1.25 x LOAD1) + LOAD2 + LOAD3 + LOAD4 MOP = (2.25 x LOAD1) + LOAD2 + LOAD3 + LOAD4

If the MOP does not equal a standard current rating of an overcurrent protective device, then the marked maximum rating is to be the next lower standard rating. However, 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
Model	Compressor	Model	208-230/3/60		460/3/60		575/3/60
			RLA*	LRA	RLA*	LRA	RLA*	LRA
	1A	ZP120	33.3	239	17.9	125	12.8	80
050	1B	ZP137	48.0	245	18.6	125	14.7	100
	2A	ZP121	33.3	239	17.9	125	12.8	80
	2B	ZP137	48.0	245	18.6	125	14.7	100
	1A	ZP137	48.0	245	18.6	125	14.7	100
051	1B	ZP137	48.0	245	18.6	125	14.7	100
	2A	ZP137	48.0	245	18.6	125	14.7	100
	2B	ZP137	48.0	245	18.6	125	14.7	100
	1A	ZP137	48.0	245	18.6	125	14.7	100
060	1B	ZP182	55.7	340	26.9	172	23.7	132
	2A	ZP137	48.0	245	18.6	125	14.7	100
	2B	ZP182	55.7	340	26.9	172	23.7	132
	1A	ZP154	51.3	300	22.4	150	19.8	109
061	1B	ZP182	55.7	340	25.0	172	23.7	132
	2A	ZP137	48.0	245	18.6	125	14.7	100
	2B	ZP182	55.7	340	25.0	172	23.7	132

TABLE 17 – POWER SUPPLY VOLTAGE LIMITS

Power Supply	Minimum Voltage	Maximum Voltage
208V/3Ph/60Hz	187	228
230V/3Ph/60Hz	207	253
460V/3Ph/60Hz	414	506
575V/3Ph/60Hz	518	632

26 JOHNSON CONTROLS