Xylem GSSERVICE R2 Service Manual Submersible Pumps & Jet Pumps - Manual (Page 71)

TROUBLESHOO
TING
69
Pump Runs But . . .
Pump develops 40 lbs. pressure, but switch
does not cut out . . .
Problem
Recommended Action
1. Pressure switch incorrectly See Switch Adjustment.
set.
2. Tubing or fittings between
Remove switch tubing and/or
switch and pump plugged. all fittings and clean.
3. Faulty switch or corroded Replace if necessary.
contact points.
Switch Chatter . . .
Problem Recommended Action
1. Caused by pressure differential Move pressure switch to
between switch and tank. tank cross tee or mount in
Equivalent feet of pipe should be a discharge tee near pump.
less than 4' to prevent chatter.
Friction loss of fittings can add
many feet of equivalent pipe,
ex. a ¾" - 90º elbow = 2' of pipe;
1" 90 = 2.7'. See TTECHWP Tech
Manual for pipe fitting
equivalents.
2. High volume flows can cause
Contact switch supplier
switch chatter (not pump mfg) for a
pressure pulsation plug -
they have very small holes
which can easily plug with
dirt and sand - use only if
absolutely nothing else
works and water is clean.