Sullair 3709 - Water-Cooled Compressors

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
Water Temp
˚F/˚C
Water Flow
Gallons Per Minute /Liters Per Minute (l)
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)
(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 H
2
O.
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).
SECTION 4
52
3000-4500 Operator’s Manual and Parts List
®SULLAIR®