700-Bubbler-Man Rev 12 13 Feb 2020
Page 17/51
3.4 CONDUCTING A MANUAL PURGE
Figure 3-3: Purge sub-menus
If the line becomes obstructed by silt, dirt or other debris, or water has accumulated in the line, the
line must be cleared. This is done by conducting a purge. No readings can be taken during the
purge.
Input the desired pressure for the purge. The pressure range is 20-90 psi; the default setting is 90
psi. The set purge pressure must be greater than the running tank pressure for the purge to take
place.
During a purge, the pump increases to the set purge pressure. Once the input purge pressure is
reached, the outlet valve is opened and the air is forced out until the tank pressure has dropped to
9 psi greater than the tank pressure was prior to purge. This prevents the ingress of water into the
line. Once the purge is complete, the tank pressure will equalize to the line pressure, and the
bubble rate will return to the settings prior to the purge.
To conduct a purge, select PURGE: START. Once the purge starts the screen will display
PURGE: STOP. The purge can be stopped during the process by selecting the PURGE: STOP option.
If PURGE: STOP is selected, the pump will stop, the tank pressure will decrease, and operations will
resume at previously configured settings. The increased pressure may cause the bubble size to
increase briefly until the tank pressure drops to the correct value.
3.4.1 LINE HIGH DETECTED DURING PURGE
If after 45 seconds of purging, the line cannot be cleared and the tank pressure is greater than
35 psi, a LINE_HIGH will be indicated in the status screen and the compressor will stop. The M and
M1 commands will continue to be sent but will return values of -99999.0. The unit will continue to
attempt to bubble (the solenoid will continue to open and close) in the event the blockage does get
cleared and normal operations can resume.
If the tank pressure is less than 35 psi, the unit will continue bubbling at the set rate.
3.4.2 BLEEDING THE TANK
The tank pressure must be bled prior to shipping, conducting some maintenance such as removing
the orifice line or swapping the bubbler. Once started, bleeding can be stopped by selecting the
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