
BYPASSING THE AIR PRESSURE SWITCH
The air pressure switch is part of the logic of the circuit, allowing the operation of the
formulation pump only if the air boom pressure is present. With this feature the
machine is not able to pump (spill) the formulation with the engine/blower “OFF”
(stopped).
Bypassing the pressure switch will enable you (without the machine’s engine running)
to determine if the switch is functioning properly.
To Bypass the pressure switch located inside the diaphragm pump enclosure perform
the following:
1.
Remove the four screws that hold the enclosure cover to the base plate (see
left side diagram). Carefully remove the cover, taking into account that some
wires are still retaining the cover to the wiring of the pump.
2.
Remove the orange wire (see right side diagram) from the switch terminal
ANO3" (normally opened), and remove the piece of tubing from terminal
ANC2" (normally closed). Place the orange wire onto terminal ANC2". Doing
this will enable the formulation pump to be operated without the machine’s
engine running.
3.
Replace orange wire and tubing back into their original positions (as shown in
the right side diagram) when finished.
33
ENCLOSURE ASSEMBLY, DIAPHRAGM PUMP
AIR PRESSURE SWITCH AND CONNECTIONS