TABLE 4-2 VENTILATION REQUIREMENTS
Cooling Type Air-Cooled with Aftercooler Water-Cooled
Motor HP/kW 40 / 30 50 / 37 60 / 45 40 / 30 50 / 37 60 / 45
Fan Air cfm/m
3
/hr
5,000 / 8,500 5,000 / 8,500 6,000 / 10,200 700 / 1,200 700 / 1,200 700 / 1,200
Ventilating Air/Heat
Rejection
BTU/Hour 114,500 142,000 171,100 10,600 13,300 15,800
KCal/Hour 28,800 35,700 46,216 2,670 3,350 4,000
Cooling Water/Heat
Rejection
BTU/Hour 114,500 142,000 171,100
KCal/Hour 28,800 35,700 43,040
Water System Venting
Vent the system upon installation or after draining the
system on start-up:
1. Open the water valve(s) allowing water to flow to the
system.
2. Open the vent cocks (located on top of the aftercooler
and the lubricant cooler) and allow all air to escape
from the system. When water is observed at the vent
cocks, close them.
The system is now vented.
Draining The Water System
If the system needs to drained completely, follow the steps
outlined below:
1. At the rear of the unit. Disconnect both the inlets and
discharge water lines.
2. Remove the drain plugs located at the bottom of the
aftercooler and lubricant cooler.
3. Allow the system to drain completely.
Water Quality Recommendations
Water quality considerations are crucial to the effective
operation of a water-cooled compressor and yet are the
most often ignored. Premature failure of components can
often be traced to a reduction in heat-transfer rate that has
resulted from a reduced flow rate due to scale build-up in
water-cooling lines or the coolers themselves.
Scale
Scale is formed from calcium carbonate, which
precipitates out of water. Calcium content tends to be
higher in water taken from wells than water taken from the
surface of lakes. A higher pH value will also assist in the
formation of lime scale. In all cases calcium will form scale
when water that has dissolved calcium is heated. It then
forms lime-scale on surfaces such as the inside of pipes
and the tubing that comprises water coolers. Scale
formation on the inside of pipes and inside of heat
exchangers acts as a thermal insulator. This causes
coolers to be less effective, and piping to have reduced
water flow, making them less effective. Over time lime
scale build-up can reduce water flow by 80% or greater.
This renders the cooling system ineffective and will
damage the system. Scale can be controlled with water
treatment.
Corrosion
As contrasted to lime scale build-up, corrosion eventually
causes a reduction in the wall thickness of pipes. High
levels of dissolved oxygen and low pH levels assist in the
creation of corrosive scale. A thin coating of lime scale is
often beneficial in helping to prevent corrosion from
forming.
Biological And Organic Fouling (Slime)
The heightened temperatures of compressor cooling
operations help to reduce the likelihood that organic
fouling will become a major concern. In the event of an
infestation, commercial chemical shock treatments are
available to control any outbreaks.
To ensure maximum life expectancy and best
performance of the compressor cooling system, refer to
Table 4-3 Water Tests on page 54.
INSTALLATION
®SULLAIR®
3000-4500 Operator’s Manual and Parts List
53
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