Product Manual

Polar Air Rotary Screw Compressors
19
Mechanical Components (Continued)
14. Check Valve (Continued)
a) Actuates oil lubrication of the air end.
b) Regulates air flow through the air
separator 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
component serves as a built-in check
valve. No additional 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 ambient 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 output pressure relatively stable. It can
also reduce operating 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.
Operation
Safety Rules
1. Make sure all operators receive product
training, read and understand all
instructions.
To avoid fires, keep all flammable,
combustible, poisonous and noxious materials
away from operating area.
Make sure there are no oily
rags, trash, leaves, litter or
other combustible materials in
operating area. Keep suitable,
fully charged fire extinguishers nearby when
servicing and operating the compressor.
2. NEVER allow modifications to
compressor structure or controls.
3. Keep all ignition sources away from
exposed live electrical parts.
4. Keep all persons clear of compressor
during start-up and operation.
This unit can automatically start! Before
attempting any repairs or adjustments,
disconnect, lock out and verify all power is off
to all circuits to minimize the
possibility of accidental start-
up or operation. This is
especially important for
remotely controlled
compressors. Serious injury could result.
5. NEVER operate the compressor with the
fan, coupling or other guards removed or
with access doors open.
6. DO NOT engage in horseplay with air
hoses as death or serious injury may result.
7. Provide adequate ventilation and use
proper lubricant while operating the
compressor. Clean-up immediately any
spilled lubricant or other combustible
substances.
8. Shut off compressor and allow it to cool
before checking or adding lubricant, or
when refilling air line anti-icer systems
with antifreeze compound. Keep sparks,
flames and other ignition sources away
and DO NOT permit smoking in the area.