Model FF-1600 with out Heat
16
17942C-1, Issue 1
Proportioning System
Figure 6. Proportioning Pump Features
To avoid unnecessary repairs, try the recommended solutions in the order given for each
problem. Before assuming there is a problem, determine that all circuit breakers,
switches, and controls are properly set.
Problems
Solutions
Proportioning pump does not hold pressure when stalled.
1
Pressure unbalance between pumps.
2,3,4
Cavitation in the Proportioning Pump.
2,3,4
Failure of the pump to reverse.
7,8
Pumps do not move and the directional indicator lights are out.
5,6,7
Pump movement is erratic.
8
Unequal pressure or speed on the upstroke versus the downstroke
9
S
OLUTIONS
1.
Determine which inlet or discharge valve is leaking. If the pump (A or R) is losing
pressure on the upstroke then check the discharge valve of the respective pump. If
the pump is losing pressure on the downstroke then check the inlet valve of the
respective pump.
a)
Close the Inlet Supply Valve and de-pressurize the Transfer Pump.
b)
De-pressurize the Proportioning Pump.
c)
Remove the appropriate valve cover and, using the magnet from the
toolbox, remove the valve ball.
d)
Flush and wipe clean the valve ball and ball seat of all residual material.
Inspect these parts for damage.
