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ELECTRICAL AND MECHANICAL
21
Printed in USA 12/02
Refrigerated Base-Remote © 2002
INTRODUCTION
This section of the manual contains drawings and schematics
of the electrical and mechanical piping systems.
ELECTRICAL ABBREVIATIONS
AND TERMINOLOGY
• RLA - Rated Load Amperage
Rated load amps is a measure of the current drawn
by a compressor when operated at compressor
manufacturer rating conditions at nominal voltage.
This value is listed at U.L. and C.S.A. as "RLA". It is
in agreement with the N.E.C. definition that the RLA
be the current draw when the compressor is
delivering rated output.
• LRA - Locked Rotor Amperage
The locked rotor amps of a compressor is the
current value recorded three seconds after rated
voltage is applied under locked rotor conditions from
a 75 degree Fahrenheit motor soakout temperature
(The voltage drop is to be predetermined and
adjusted accordingly prior to testing). This value
appears on the compressor serial plate and on all
compressor statistics sheets.
It may be well to note that the practice in the past
was to show an additional column marked, "LRA
U.L. Test Report". This is no longer needed since
the U.L. investigation work, regarding component
rating, will be guided by the compressor
manufacturer's published value.
• MCG - Maximum Continuous Current
Maximum continuous current is a limiting ampere
value that must not be greater than 156% of the
RLA of the compressor as marked on the nameplate
of the particular unit into which that compressor is
applied.
Table 9.1 - Operating Pressures
REFRIGERANT: R-12
Cabinet Ambient Suction Pressure Head Pressure
-5 degrees F (Fre.) 90 degrees F 0-10 lbs. 120-150 lbs.
37 degrees F (Ref.) 90 degrees F 18-35 lbs. 120-150 lbs.
REFRIGERANT: R-22
Cabinet Ambient Suction Pressure Head Pressure
-5 degrees F (Fre.) 90 degrees F 10-15 lbs. 200-250 lbs.
37 degrees F (Ref.) 90 degrees F 37-67 lbs. 200-250 lbs.
REFRIGERANT: 134A
Cabinet Ambient Suction Pressure Head Pressure
-5 degrees F (Fre.) 90 degrees F -5-10 lbs. 120-150 lbs.
37 degrees F (Ref.) 90 degrees F 16-37 lbs. 120-150 lbs.
REFRIGERANT: 404A
Cabinet Ambient Suction Pressure Head Pressure
-5 degrees F (Fre.) 90 degrees F 15-20 lbs. 250-300 lbs.
37 degrees F (Ref.) 90 degrees F 68-84 lbs. 250-300 lbs.
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