PH/PHX-2 Manual
37
Metering Pump Line
NOTE: As seen from front of unit.
Follow the recommended procedure in the indicated order to solve the problem and
avoid unnecessary repairs. Make sure all Switches are in the correct position and
Indicator Lights ON before determining the existence of a fault.
PROBLEM ____________________________________________________________
Metering pumps do not change direction and the pressures on both of chemical gauges are
lower than normal.
SOLUTIONS
1. The Metering Pump Line has Reversing Plates which actuates two Proximity Switches
(EL-153, Page 82), one at each end of the stroke. The Prox Switches in turn actuates
the appropriate Directional Valve Solenoid (HI-05003, Page 82).
Failure to make contact with either PROX Switch may be caused by:
Deformation of the Reversing Plate.
Foreign material preventing the Reversing Plate from contacting the Prox
Switches.
2. Passing of the Reversing Plate beyond the Prox Switch may be caused by:
Failure of the Prox Switch and related components on the side of the over-run.
Failure of a component of the Directional Valve.
Mounting Plate (PU-07006, Page 82) and/or Prox Switch is out of adjustment.
IF THE DIRECTIONAL INDICATOR LIGHT (P, Q, Page 15) IS ON CHECK THE
REVERSING VALVE COIL ON THE SIDE THAT THE LIGHT IS ON. IF YOU HAVE 24
VOLTS DC AT THE PLUG CHECK THE OHM’S RESISTANCE OF THE COIL, IT SHOULD
READ APPROXIMATELY 19 OHM’s, IF NOT REPLACE THE COIL OR REVERSING
VALVE.
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