Product Manual

pb025nmdl3sm-rev0316 Page 6
TROUBLESHOOTING
Possible Symptoms:
• Pump will not cycle.
• Pump cycles, but produces no
ow.
• Pump cycles, but ow rate is
unsatisfactory.
• Pump cycle seems unbalanced.
• Pump cycle seems to produce
excessive vibration.
What to Check: Excessive suction lift
in system.
Corrective Action: For lifts
exceeding 20 feet (6 meters), lling the
pumping chambers with liquid will prime
the pump in most cases.
What to Check: Excessive ooded
suction in system.
Corrective Action: For flooded
conditions exceeding 10 feet
(3 meters) of liquid, install a back
pressure device.
What to Check: System head exceeds
air supply pressure.
Corrective Action: Increase the
inlet air pressure to the pump. Most
diaphragm pumps are designed for 1:1
pressure ratio at zero ow.
What to Check: Air supply pressure or
volume exceeds system head.
Corrective Action: Decrease in-
let air pressure and volume to the
pump as calculated on the published
PERFORMANCE CURVE. Pump is
cavitating the uid by fast cycling.
What to Check: Undersized suction
line.
Corrective Action: Meet or exceed
pump connection recommenda-
tions shown on the DIMENSIONAL
DRAWING.
What to Check: Restricted or
undersized air line.
Corrective Action: Install a larger
air line and connection. Refer to air
inlet recommendations shown in your
pump’s SERVICE MANUAL.
What to Check: Check ESADS, the
Externally Serviceable Air Distribution
System of the pump.
Corrective Action: Disassemble and
inspect the main air distribution valve,
pilot valve and pilot valve actuators.
Refer to the parts drawing and air valve
section of the SERVICE MANUAL.
Check for clogged discharge or closed
valve before reassembly.
What to Check: Rigid pipe
connections to pump.
Corrective Action: Install flexible
connectors and a Warren Rupp
®
Tranquilizer
®
surge suppressor.
What to Check: Blocked air exhaust
mufer.
Corrective Action: Remove mufer
screen, clean or de-ice and reinstall.
Refer to the Air Exhaust section of your
pump SERVICE MANUAL.
What to Check: Pumped uid in air
exhaust mufer.
Corrective Action: Disassemble
pump chambers. Inspect for
diaphragm rupture or loose dia-
phragm plate assembly. Refer to the
Diaphragm Replacement section of
your pump SERVICE MANUAL.
What to Check: Suction side air
leakage or air in product.
Corrective Action: Visually inspect
all suction side gaskets and pipe
connections.
What to Check: Obstructed check
valve.
Corrective Action: Disassemble
the wet end of the pump and
manually dislodge obstruction in
the check valve pocket. Refer to
the Check Valve section of the pump
SERVICE MANUAL for disassembly
instructions.
What to Check: Worn or misaligned
check valve or check valve seat.
Corrective Action: Inspect check
valves and seats for wear and proper
seating. Replace if necessary. Refer
to Check Valve section of the pump
SERVICE MANUAL for disassembly
instructions.
What to Check: Blocked suction line.
Corrective Action: Remove or ush
obstruction. Check and clear all
suction screens and strainers.
What to Check: Blocked discharge
line.
Corrective Action: Check for
obstruction or closed discharge line
valves.
What to Check: Blocked pumping
chamber.
Corrective Action: Disassemble
and inspect the wetted chambers
of the pump. Remove or flush any
obstructions.
What to Check: Entrained air or
vapor lock in one or both pumping
chambers.
Corrective Action: Purge chambers
through tapped chamber vent plugs.
PURGING THE CHAMBERS OF
AIR CAN BE DANGEROUS! Contact
the Warren Rupp Technical Services
Department before performing this
procedure. Any model with top-ported
discharge will reduce or eliminate
problems with entrained air.
If your pump continues to perform
below your expectations, contact
your local Warren Rupp Distributor
or factory Technical Services
Group for a service evaluation.
WARRANTY
This pump is warranted for a period of
ve years against defective material
and workmanship. Failure to comply
with the recommendations stated in
this manual voids all factory warranty.