Filter
Top Products
JOHNSON CONTROLS
26
FORM 100.50-EG5 (108)
Electrical Data
ELECTRICAL SERVICE SIZING
In order to use the electrical service required for the cool-
ing-only Eco
2
rooftop, use the appropriate calculations
listed below from U.L. 1995. Based on the confi guration
of the rooftop, the calculations will yield different MCA
(minimum circuit ampacity), and MOP (maximum over-
current protection).
Using the following load defi nitions 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 Defi nitions:
• 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.
• 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.
TABLE 16 – COMPRESSOR ELECTRICAL DATA
Model Compressor Model
Nominal Voltage
208-230/3/60 460/3/60 575/3/60
RLA* LRA RLA* LRA RLA* LRA
050
1A ZP120 33.3 239 17.9 125 12.8 80
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
051
1A ZP137 48.0 245 18.6 125 14.7 100
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
060
1A ZP137 48.0 245 18.6 125 14.7 100
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
061
1A ZP154 51.3 300 22.4 150 19.8 109
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