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Compressor Capacity Notes
1. Compressor capacities are based on 1750 rpm and 15 F
subcooling for all unit sizes and refrigerants.
2. Multiplying factors for other rpm:
See Multiplying Factors chart on page 31.
3. Liquid subcooling greater than (less than) 15 F incorpo-
rated in ratings increases (decreases) system capacity by
1
/
2
of 1% for each degree of subcooling. When correcting
for subcooling, brake horsepower does not change.
4. Refrigerant temperatures shown in Table 5 are saturation
temperatures corresponding to pressures indicated at
compressor. Actual gas temperatures are higher because
of superheat.
5. Capacities are based on actual suction gas tempera-
tures to compressor of 65 F for R-12, R-134a, R-502,
and R-507/404A. (This assumes superheat is obtained
from liquid suction interchanger or in evaporator.)
Capacity corrections, other than for rated suction gas
temperatures, may be obtained by using Rating Basis and
Capacity Multipliers Tables 6 and 7. Refrigerant-22
suction gas superheat for ratings (15 F) normally occurs
because of expansion valve operation and line losses.
Therefore, R-22 ratings can be used without adjustment.
An alternate method for capacity correction is to run the
Carlyle Selection program to obtain performance ratings
at other than 65 F return gas temperature.
Compressor ratings and capacities are included in
Tables 8-12.
Compressor Features and Accessories
WATER-COOLED HEADS AND OIL COOLERS — Water
cooled heads are typically not necessary for R-12 or R-134a
applications within the range of compressor ratings shown in
this publication. For R-502, or R-507/404A at the shaded con-
ditions shown in the compressor ratings tables, water-cooled
heads may be necessary, if the discharge temperature is greater
than 275 F. The discharge temperature will increase with return
gas temperature.
When operating conditions are such that suction gas
becomes highly superheated and/or the compression ratio is
high, it is recommended that an oil cooler be used on the com-
pressor. An oil cooler is required on increased displacement
compressors (5H46, 66, 86, and 126) on installations where
compressor(s) can be subjected to extended periods of continu-
ous, fully unloaded operation. These periods do not afford
sufficient removal of compression and friction heat, and could
result in overheating of the running gear, shaft seal and crank-
case oil. The addition of an oil cooler removes excessive
heat, ensuring increased life expectancy of compressor and
components.
Extended periods of continuous, fully unloaded operation
will occur usually on variable-volume installations that use hot
gas bypass to maintain conditions under all load situations.
Without hot gas bypass, the compressor will usually cycle on
the low-pressure switch (or temperature controlling device)
giving time for seal, oil and crankcase to cool.
On multiple-compressor installations where all units are
manifolded into one refrigerant circuit, the controls should be
designed to cycle off compressors at light loads to put maxi-
mum output on the still operative compressor. It is always
desirable for the compressor to operate with as many cylinders
as possible in loaded condition.
Water-cooled oil cooler package is available from the
factory and is easily field installed on all 5 Series compressors.
Refer to 5F,H Compressor Ratings to determine when oil
coolers are required. These ratings, however, do not indicate oil
cooler requirements during periods of extended continuous
operation under fully unloaded operation. This should be
determined on individual job basis.
Water flow through compressor heads (and water-cooled oil
coolers, if used) must be shut off when the compressor is not
running to prevent refrigerant vapors from condensing at the
compressor during OFF cycles. For this purpose a solenoid
valve is recommended in the water supply line to compressor
heads.
Values listed in Table 13 assume a water temperature rise of
30 degrees. Oil cooler and water-cooled heads must be piped in
series, with the oil cooler first. Leaving water temperature
should be between 100 F and 120 F, with 120 F being maxi-
mum allowable temperature. Maximum working pressure for
water-cooled heads is 125 psi.
Table 5 — Total Heat Rejection Factors
Total Heat Rejection (tons) = Compressor Capacity (tons) x Heat Rejection Factor*
*Complete capacity corrections before calculating for total heat rejection (refer to Compressor Capacity Note 5).
RPM 1450 1160
Capacity
0.835 0.674
Bhp
0.798 0.602
SAT.
DISCHARGE
TEMP (F)
SATURATED SUCTION TEMPERATURES (F)
–60–50–40–30–20–100 102030323435363840424445464850
80 1.610 1.547 1.490 1.439 1.391 1.344 1.300 1.256 1.214 1.176 1.168 1.160 1.155 1.150 1.142 1.138 1.129 1.121 1.118 1.112 1.110 1.105
90 — 1.590 1.526 1.472 1.422 1.373 1.327 1.282 1.238 1.196 1.190 1.180 1.178 1.171 1.165 1.157 1.150 1.142 1.138 1.135 1.129 1.122
100 — 1.630 1.570 1.513 1.461 1.409 1.361 1.312 1.267 1.222 1.215 1.205 1.202 1.200 1.190 1.180 1.175 1.165 1.162 1.158 1.150 1.143
105 — 1.655 1.595 1.538 1.483 1.431 1.380 1.330 1.283 1.237 1.232 1.220 1.219 1.215 1.205 1.194 1.189 1.178 1.175 1.170 1.162 1.155
110 ——1.622 1.564 1.508 1.454 1.402 1.350 1.301 1.253 1.248 1.238 1.235 1.228 1.220 1.208 1.200 1.192 1.190 1.185 1.178 1.168
120 ——1.698 1.628 1.565 1.508 1.451 1.395 1.341 1.288 1.280 1.270 1.265 1.261 1.251 1.240 1.232 1.222 1.220 1.215 1.205 1.195
130 —————1.567 1.506 1.445 1.383 1.327 1.320 1.310 1.300 1.295 1.285 1.275 1.268 1.255 1.250 1.248 1.238 1.225
140 ——————1.565 1.500 1.430 1.368 1.355 1.345 1.338 1.332 1.318 1.310 1.300 1.290 1.288 1.280 1.270 1.255
145 ———————1.526 1.455 1.390 1.378 1.365 1.355 1.350 1.340 1.330 1.320 1.310 1.300 1.298 1.285 1.270