Electrical Data; Compressor Data - York ECO R-22 User Manual

Electrical Data

ELECTRICAL SERVICE SIZING
In order to use the electrical service required for the cool-
2
ing only eco 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
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.
TABLE 24 – COMPRESSOR DATA
Compressor
Model Quantity
Model
per Unit
50 4 SZ160
55 4 SZ160
60 4 SZ185
65 4 SZ185
4 SZ125
70
2 SZ160
4 SZ125
75
2 SZ160
80 6 SZ160
85 6 SZ160
2 SZ160
90
4 SZ185
2 SZ160
95
4 SZ185
52
Use the following calculations to determine MCA
and MOP for units supplied with a single-point power
connection:
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
400/3/50
RLA LRA
24.2 135
24.2 135
27.9 175
27.9 175
17.9 120
24.2 135
17.9 120
24.2 135
24.2 135
24.2 135
24.2 135
27.9 175
24.2 135
27.9 175
• 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.
MCA = (1.25 x LOAD1) + LOAD2 + LOAD3 + LOAD4
MOP = (2.25 x LOAD1) + LOAD2 + LOAD3 + LOAD4
YORK INTERNATIONAL