45
TEMPMASTER
FORM TPM3-EG1 (518)
Electrical Data
ELECTRICAL SERVICE SIZING
In order to use the electrical service required for the cooling only TempMaster OmniElite
single package unit, use the appropriate calculations listed below from U.L. 1995. Based
on the configuration of the single package unit, the calculations will yield different mini-
mum circuit ampacity (MCA) and maximum overcurrent protection (MOP).
Using the following load definitions and calculations, determine the correct electrical siz-
ing 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 – compressor 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 (
Note:
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 + 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 21 -
COMPRESSOR DATA
MODEL
COMPRESSOR
NOMINAL VOLTAGE
QTY
MODEL
460/3/60
575/3/60
RLA
LRA
RLA
LRA
120
4
ZP182
26.9
173
23.7
132
2
ZP296
37.8
320
34.6
250
130
2
ZP182
26.9
173
23.7
132
1
ZP236
30.8
229
25.0
180
3
ZP296
37.8
320
34.6
250
150
2
ZP182
26.9
173
23.7
132
2
ZP236
30.8
229
25.0
180
2
ZP385
54.5
310
49.4
239
NOTE:
RLA = running load amps
LRA = lock rotor amps
RLA is per compressor.