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Chapter 3: System Operation
During actual operating time, the compressor uses 22 amp/hrs of current. (160 amps required to start a
momentarily stopped rotor) Therefore, it is recommended that a marine deep cycle or vehicle battery be
used to operate the unit.
The automatic operation of the unit from the pressure switch should minimize the actual power consumed
during sampling of wells.
For instance, users have advised us that when performing Low Flow purging and sampling in accordance
with Marschalk’s recommendations, and sampling wells of 20 ft. depths, a small garden tractor battery
having a current capacity of 35 amp/hr will last them up to 6 or 7 hours.
When tank pressure reaches about 90 psig, you are now ready to use the air compressor for pumping
applications. As indicated on the pressure switch label, the compressor will shut off when tank pressure
reaches 90 psig, and will come back on when tank pressure drops to about 70 psig.
Connect the quick-connect end of the air line provided to the air tank. Connect the other end which has the
in-line filter, as well as a female quick-
connect on it, to the pump controller’s air inlet port, which is a male
quick-connect on any Marschalk pump controller.
NOTE: Prior to connecting the airline to the controller, turn the controller pressure regulator
knob in the counterclockwise direction until it feels “loose”. This will ensure that low pressure
will be present at the controller discharge. It is important to start the controller set-up process
with the pressure at a minimum point. Increase the pumping pressure 3-5 psi during each
pump cycle until water begins coming out of the discharge tube at the surface. At this point
you can fine-tune the pumping pressure to achieve your desired flow rate.
