SECTION 7 DE-18 USER MANUAL
89
• VERIFY CONDENSATE STRAINERS ARE
CLEAN & INTACT
• VERIFY COMPRESSOR LOADING
The DE-18 air discharge piping will normally be
connected to a plant air piping system pressurized by
permanently installed air compressors within the
plant. Because of this, the DE-18 will not have a
demand for air and the machine will not start. In
order to get the machine to start and properly verify
loading of the compressor, the following items should
be installed in the discharge piping system (see
Figure 7-14 for abbreviated piping and
instrumentation diagram):
• tee - should be installed in the discharge
piping near the compressor
• shut-off valve - to separate the plant air
from the DE-18 discharge
• throttling valve – throttles the DE-18 dis-
charge air to allow loading
• pressure gauge – installed before throttling
valve to help adjust throttling pressure
• muffler – installed after the throttling valve
to quiet the discharge air; In cold climates,
the muffler should be covered to prevent
water from freezing in it; if water freezes in
the muffler, it may burst causing harm.
After these components are installed, the DE-18
should be shut-off from the plant piping system by
closing the shut-off valve. The throttling valve should
be open. The machine should now be started. It will
complete the warm-up sequence and attempt to
load. After the warm-up sequence, the throttling
valve should now be set so that the DE-18 will stay in
a loaded state and remain at maximum rpm. This is
completed by adjusting the valve so that the actual
discharge pressure is set to be about 5 psi under the
desired discharge pressure as indicated on the front
of the control panel. Usually, this set-up will only
need to be done once and will remain the same for
subsequent load tests. The compressor is to run 1
hour at full load. At the end of 1 hour run time, the
compressor is to be shut down normally and allowed
to complete the standard cool down sequence. To
return to normal operating conditions, the throttling
valve should be closed to keep air from the plant
piping system from escaping when the shut-off valve
is opened.
Within 24 to 48 hours of shutdown of the
compressor, the air end must be rotated 8-10 times.
Do not allow the engine to start. Rotate the
compressor by hand or by using the engine’s starter
motors. The object is to rotate the air end so as to not
allow condensate debris to create a restriction thus
binding the second stage air end. Not completing this
step may void the warranty.
• VERIFY OPERATION OF BOTH CONDENSATE
DRAINS
As the machine makes air, the condensate drains
should open periodically per the timing schedule set
in the controller. The 1st stage drain may not have
significant condensate discharge. However, the 2nd
stage drain will most likely have significant
condensate discharge. Proper operation of these
drains is very important. Inoperative drains could
cause a back-up of condensate throughout the entire
discharge system and cause severe damage to the
compressor and components.
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