R90 - 160N / R90 - 160I / R90 - 160NE / R90 - 160IE
http://www.ingersollrandproducts.com
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7.0 INSTALLATI ON
Harsh water coolers (shell & tube heat
exchangers):
1.
Disconnect the inlet and discharge water lines from
the connections located at the rear of the unit.
2.
Locate the aftercooler and oil cooler. Remove the
drain plugs located at the bottom of the coolers.
3.
Open the vent ports in the top of the aftercooler and
oil cooler
4.
Allow the system to completely drain.
Adjusting the Aftercooler Trim Valve
See piping and instrumentation diagram (Section
8.3). The coolers are piped in a “parallel” water flow
arrangement with a manual trim valve controlling the
flow through the aftercooler. The Aftercooler Trim Valve is
factory set and should not need adjusting but if disturbed
use following procedure.
1.
Close valve fully clockwise and then open 2 full turns.
2.
With the machine running loaded observe the pack-
age discharge temperature on the Intellisys display. It
should be approximately 15° F (8° C) above the water
inlet temperature.
3.
If the temperature is too high, open the valve ¼ turn
and wait 1 minute. If the temperature is too low, close
the valve ¼ turn and wait 1 minute. Repeat the incre-
mental movements until the desired temperature is
reached.
4.
Put a “Warning − Do Not Adjust” label on the valve or
fit a lock.
Water quality recommendations
Water quality is often overlooked when the cooling system
of a water−cooled air compressor is examined. Water
quality determines how effective the heat transfer rate,
as well as the flow rate will remain during the life of the
unit. It should be noted that the quality of water used in
any cooling system does not remain constant during the
operation of the system. Evaporation, corrosion, chemical
and temperature changes, aeration, scale and biological
formations affect the water makeup. Most problems in
a cooling system first appear as a reduction in the heat
transfer rate, then in a reduced flow rate or increased
pressure drop, and finally with damage to the system.
Scale
: Scale formation inhibits effective heat transfer,
yet it does help prevent corrosion. Therefore, a thin
uniform coating of calcium carbonate is desired on the
inner surface. Perhaps the largest contributor to scale
formation is the precipitation of calcium carbonate out of
the water. This is dependent on temperature and pH level.
The higher the pH value, the greater the chance of scale
formation. Scale can be controlled with water treatment.
Corrosion
: In contrast to scale formation is the problem
of corrosion. Chlorides cause problems because of their
size and conductivity. Low pH levels promote corrosion,
as well as high levels of dissolved oxygen.
Fouling
: Biological and organic substances (slime)
can also cause problems, but in elevated temperature
environments such as cooling processes they are not a
major concern. If they create problems with clogging,
commercial shock treatments are available.
To ensure good operation life and performance of
the compressor cooling system, the recommended
acceptable ranges for different water constituents are
included below:
ACCEPTABLE MAXIMUM LIMITS
Substance
Test Interval
Fresh Water (Brazed Plate
Heat Exchanger
Dirty Water / Sea Water (Shell &
Tube Heat Exchanger)
Langelier Index (LI)
Monthly
0 to 1
-0.5 to 2.5
Ammonia [NH3], ppm
Monthly
<1
<2
Ammonium [NH4-1], ppm
Monthly
<2
<5
Chlorides [Cl-], ppm
Monthly
<80
<1000
Copper [Cu], ppm
Monthly
<0.01
<0.5
Dissolved Oxygen (DO) [O2], ppm
Weekly
<0.1
<3
Iron + Manganese [Fe + Mn], ppm
Monthly
<0.3
<2
Nitrate [NO3-], ppm
Monthly
<100
<125
Oil & Grease, ppm
Monthly
<5
<5
Silicon Dioxide (silica) [SiO2], ppm
Monthly
<30
<100
Sulfates [SO4-2], ppm
Monthly
<70
<250