Operating Manual
Troubleshooting
2/12/04
27
Proportioning System
Figure 15. Proportioning Pump Features
Try the recommended solutions in the order given for each problem to avoid unnecessary
repairs. Also, determine that all circuit breakers, switches, and controls are properly set
and wiring is correct before assuming there is a problem. Turn off all switches and allow
the chemicals to cool before attempting troubleshooting procedures.
Problems Solutions
Proportioning pump does not hold pressure when stalled.
1
Pressure imbalance between pumps.
2,3,1
Cavitation in the proportioning pump.
2,3,1
Failure of the pump to reverse.
4,7
Pumps do not move and the directional indicator lights are out.
4,5,6
Pump movement is erratic.
7
Unequal pressure or speed on the upstroke verses the down stroke.
8
S
OLUTIONS
1. LEAKING BALL CHECK VALVE -Determine which inlet and discharge ball valve
is leaking by observing the pressure gauges. If the pump (A or R) is losing pressure
on the upstroke, check the discharge valve of the respective pump. If the pump is
losing pressure on the down stroke, check the inlet valve of the respective pump.
a)
Disconnect the air supply to the transfer pumps and proportioning unit.
b)
Close the inlet supply valve of the problem pump and bleed chemical
pressure in the transfer pump to zero.
c)
Bleed chemical pressure in the proportioning pump to zero.
d)
Remove the appropriate valve cover and use a magnet to remove the
valve ball.
e)
Flush and wipe clean the valve ball and ball seat of all residual
material. Inspect these parts for damage.
