SKID MOUNTED CENTACS
1. Position skid on stable
level, hardpacked surface. Unit does not require anchor
bolts but adequate drainage should be provided.
NOTE: Leave 10’ side
clearance between units or other obstruction for
proper maintenance access.
2. Connect the compressor
unit to the air system by means of suitable piping and
discharge block valve. If the air system is wet, a drip
leg should be put in the discharge air piping and used
to keep the wet air from feeding back to the compressor
and damaging the control system. Connect the water
piping, insuring “water in” is piped to the “inlet”
connection of the water manifold at correct flow and
3. The customer must
provide a source of clean/dry instrument air to the
unit. A minimum of 80 PSIG control air is required for
proper operation of the unit. The customer must also
make arrangements for removal of condensate and drain
water from around the unit.
4. Connect the
electrical ground strap.
5. Connect the main
power. The wiring and/or transformer(s) must be
properly sized, installed, and protected per local and
national electrical codes. For multi-unit
installations, each unit should be equipped with a means
of isolating it from the other units for maintenance
purposes (pole fuses, fused disconnect, breaker, etc.)
This protects the wiring and allows safe access to the
switchgear, should maintenance be required. The
customer’s electrical equipment should be sized to
provide the correct voltage at starting amperage/current
draw (for approx. 10 seconds) and normal running
amperage/current draw. The electrical service must
be adequately sized and protected or the unit cannot be
operated. Some units require auxiliary power (see
data sheet). Access panels are provided on each side of
the motor starter for power termination. (Please do
not cut holes in the roof).
operating pressure on three and four state units is 60
PSIG. If the customer’s system is going to operate at a
lower pressure, the customer must provide some means of
maintaining this back pressure on the unit(s).
7. In order to minimize
the customer’s start-up time and expense, steps 1
through 6 should be completed prior to arrival of the
AirNow Compression Services start-up representative.
8. In the interest of
getting the unit(s) on line as fast as possible and
keeping the start-up expenses to a minimum, the customer
should realize the start-up representative may need
assistance (millwright, electrician, and instrument
technician) in performing pre-start checks including the
Verification that the unit is adequately level.
Check/reset alignment of main drive motor to compressor.
critical compressor clearances.
motor rotation (main leads may need to be switched).
Check calibration of controls and shutdowns.
9. The unit will be
started by the AirNow Compression Services service
representative after the per-start checks have been
completed. After making certain the unit is operating
satisfactorily, the service representative will monitor
the unit operation and log readings for two (2) hours.
This is an excellent time to begin training the
customer’s operating and maintenance personnel.
Customer personnel training will continue until the
customer is satisfied with the unit’s operation and his
personnel are trained. At this point, the customer’s
representative that will be responsible for the unit
will sign the D-RCS service representative’s time sheet
and release him from the job.
HINTS FOR BETTER
OPERATION: This type of unit
operates best in an ambient range of 20* F to 100* F,
therefore, placement of the unit in the plant is
important. During the summer months, avoid putting the
unit in an area that has temperatures higher than
ambient. Locate the unit in as clean and environment as
possible. This helps avoid premature clogging of the
air filters and possible internal damage to the unit.
During winter operation,
with ambient below freezing (32* F), the attached
guidelines for cold weather operation need to be adhered
COLD WEATHER OPTION FOR
WHILE UNIT IS IN
1. Maintain water
flow through oil cooler not in use (sufficient flow to
leaving cooler above 50* F).
2. Maintain water
flow from cooler top vents.
3. Maintain greater
than normal flow from condensate drains.
WHILE UNIT IS DOWN:
Continue to maintain water
flow through machine. If unit is to be down for an
extended period, or maintaining water flow is a problem,
please follow the below procedure to completely drain
unit. (Failure to follow this procedure can result
in extensive damage to compressor components).
PROCEDURE TO DRAIN
COOLING WATER FROM UNIT:
Verify all drain points
are not plugged and do drain freely.
1. Close water
supply valve and verify no seepage (off skid valve).
2. Open drain valves
on each stage cooler housing, located under water
(On C25’s drain
is under compressor case).
3. Remove drain
plugs from oil cooler and caps. (Both Coolers)
4. Verify all on
skid cooling water valves are full open.
5. Verify all drain
points are free flowing.
6. When all water
has drained use air hose of ½” I.D. connected to 100 PSI
With no more
that 100 feet length to blow out unit from vent
7. Full flow air
hose into top port of each oil cooler water drain, and
allow full flow for 3 Minutes in each top
8. Repeat step (7)
only use bottom ports for air blow.
9. Repeat step (7)
10. Reinstall oil
cooler drain plugs.