3000P-4500 USER MANUAL SECTION 4
52
WATER-COOLED COMPRESSORS
Adequate cooling water flow must be supplied to
water- cooled compressors. Water delivery must be
verified to assure constant delivery of the volumes
outlined in Table 4-1: WATER FLOW
REQUIREMENTS on page 52. The figures shown
are for full-load operation utilizing an aftercooler.
Cooler water will reduce water-flow requirements and
warmer water will increase water-flow requirements.
Water piping to and from the compressor unit must
be a minimum of 1 inch diameter. Isolation valves
with side drains should be installed on both input and
return lines. Input water should have a 2 mm strainer
installed in-line. A normally closed solenoid valve
should be connected to the water outlet of the
compressor. The compressor control circuit switches
this circuit. Consult the Sullair Service Department
for assistance in these setups.
Water quality is critical to proper cooling of the
compressor. Excessive build-up of lime, scale or
other deposits can restrict the flow of water to the
compressor. These deposits act as a thermal
insulator and reduce the efficiency of the water
cooler.
The cleaning of piping and water coolers is the
customer’s responsibility. Inspect all piping for
deposits and clean as necessary. Refer to Water
Quality Recommendations on page 53.
Table 4-1: WATER FLOW REQUIREMENTS
(I) Water pressure should be maintained between 25
and 75 psig (1.7 and 5.2 bar), but not to exceed 145
psig (10 bar)
Table 4-2: VENTILATION REQUIREMENTS on
page 53 indicates the minimum ventilation
requirements necessary to keep the compressor
running at its normal operating temperature. The fan
air requirement is the amount of air, which must flow
through the compressor for proper ventilation. The
heat rejection requirement is the amount of heat that
is radiated by the compressor. This heat must be
removed to assure a normal operating temperature.
With air-cooled compressors it is possible to use this
heat for space heating, providing additional pressure
drop across the fan does not exceed 0.2 in H2O.
Consult a Sullair office for assistance in utilizing this
heat. If ductwork is added, the high static fan option
is required.
DO NOT install a water-cooled or an air-cooled/after-
cooled compressor where it will be exposed to
temperatures less than 32°F (0°C). Consult factory
for machine operation in ambient temperature less
than 32°F (0°C).
If machine is equipped with water regulating valve,
use the water regulating valve to adjust compressor
temperature to maintain a minimum of 180°F
(82.2°C); 190°F (87.8°C) for 24KT.
Temperature and pressure gauges should be
installed in the water piping for use in troubleshooting
of the water system. Water pressure should ideally
be between 25 and 75 psig (1.7 and 5.2 bar) but
must not be above 145 psi (10 bar).
Water Temp
°F/°C
Water Flow
Gallons Per Minute/Liters Per Minute (I)
40HP/30kW 50HP/37kW 60HP/45kW
70/21 5.6 7.0 (26.5) 9.0 (31.6)
80/27 8.4 10.5 (35.7) 11.5 (41.6)
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