Product Manual

11
Operating Instructions
dicator when unit is shut down. During operation,
the oil level should stay between the high oil level
line and the lowest oil level line. A drain valve is
installed under the air/oil separator tank. Open
drain valve after machine has been shut down for
an hour slightly to drain condensed water in the
tank. This drain valve can also be used to gather
oil for oil analysis. Refer to warranty statement for
analysis requirements.
Replace lubricating oil after first 600 hours of
operation, then every 4000 hours or more often
if needed. Refer to the computer controls of
the compressor to monitor operating time and
remember to reset to 0 when filter is replaced.
There is an automatic alarm that can be set to
remind operator of service times.
Use only EMAX oil, model no.
AROL8000G1. For food
manufacturing applications, use model no.
AROLFOODG1. Use of any other product will cause
product damage and void the warranty. Refer to
warranty statement for oil requirements.
11. Air/Oil Separator Filter
During the process of air compression from pump,
air and oil are mixed together to lubricate, seal
and cool compressor rotors. This air and oil is
tranferred to air/oil separator tank and then
the air/oil separtor filter removes oil mist from
the compressed air. The filter core is made of
multiple-layer fine glass fibers. The filter reduces
the oil partical size and can lower content to less
than 3 PPM. During normal operation, the air/oil
separator filter can be used for about 4000 hours
or annually, whichever comes first. Refer to the
computer controls of the compressor to monitor
operating time and remember to reset to 0 when
filter is replaced. There is an automatic alarm that
can be set to remind operator of service times.
12. Safety Valve
The ASME certified safety valve on the air/oil
separator tank is set to open when the pressure
exceeds 175 PSI (12.1 bar). NEVER attempt to
operate machince without ASME safety valve.
13. Blow Down Valve
The blow down valve is a two-way valve normally
open. When the machine is shut down or the
compressor is empty, the vent valve opens and
relieves pressure in the air/oil separator tank to
ensure the compressor will not be started under
load.
14. Check Valve
A minimum pressure check valve is installed after
the air oil separator filter. The starting pressure is
set at over 43.5 PSI (3 bar). The functions of the
minimum pressure valve are as follows:
a) Acuates oil lubrication of the air end.
b) Regulates air flow through the air separa-
tor filter to prevent damage to the separator
filter element. Air flow begins when pressure
in the air / oil separator tank reaches 43.5
PSI (3 bar).
c) Prevents back flow from the air receiver tank
into the air / oil separator tank. This compo-
nent serves as a built-in check valve. No ad-
ditional check valve is needed for installation.
15. After Cooler
The air flows through the check valve then enters
the after cooler. The fan on the air cooled after
cooler radiator draws in ambient air and blows
it through the radiator cores to reduce heat in
the compressed air and lubricating oil exhausted
from the rotary screw pump. The heat absorbed
in the radiator cores is discharged from the screw
cabinet because of the cooling fan and generally
reduces air temperature by 60˚F (15˚C). If ambi-
ent air temperature exceeds 112˚F (45˚C), the
system may overheat. It is important to operate
the compressor in a well ventilated area for the
cooling process to be effective.
16. Air Storage Tank (optional, not shown)
The air storage tank can serve as cushion to keep out-
put pressure relatively stable. It can also reduce oper-
ating temperature, remove moisture content, provide
cleaner air and reduce the load of the dryer. A larger
tank also reduces the cycling of the suction valve. As
a guideline, for every CFM the compressor produces, a
minimum of 1.2 gal. of air storage is needed.
17. Refrigerated Dryer/Coalescing Filter (optional,
not shown)
The refrigerated dryer removes moisture content.
The coalescing filter removes oil droplets and
impurities in the compressed air. The refrigerated
dyer / coalescing filter operates best with an
automatic drain that removes water condensation
collected during the air drying process.