Carrier 09RH specifications Rpm, SAT Saturated Suction Temperatures F Discharge Temp F

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.