Sullair SD-1050 Series, User Manual

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USER MANUAL
Models SD-820 to SD-1710 with DDS
Rev 04 – October 2005
8
2.4 PURGE EXHAUST
The purge exhaust may be piped to an open vent. Noise levels at the dryer may be
reduced by extending the purge exhaust piping to a remote location. Refer to the purge
piping selection chart below to prevent excessive backpressure which may adversely
affect dryer performance.
EXTENDED LENGTH PIPE SIZE REQUIRED
TO 10 FEET SAME SIZE AS DRYER EXHAUST
TO 25 FEET 1 SIZE LARGER THAN DRYER EXHAUST
TO 50 FEET 2 SIZES LARGER THAN DRYER EXHAUST
TO 100 FEET 3 SIZES LARGER THAN DRYER EXHAUST
Extending purge exhaust piping must not cause excessive back pressure on the
chamber being regenerated. A pressure reading of 3-psig there is considered too high
for the dryer to regenerate efficiently.
2.5 DDS CONTROL CONNECTION
Check that the sample line (1/8-in Teflon tube) is connected from the dryer outlet (see
flow schematic in section 7) to the inlet valve on the humidity probe sample cell. The
humidity probe comes in a transport container found inside the control panel. Remove
probe from container and install it in the sample humidity cell (see figure 1). Close the
container and keep it inside the control panel for future maintenance.
Connect the coaxial cable to the humidity probe.
FIGURE 1 – HUMIDITY CELL ASSEMBLY