Sandpiper S20 Non-Metallic User Manual download pdf (Page 13)

520-202-000 9/03 Model S20 Non-Metallic Design Level 2 Page 11

TROUBLESHOOTING

Possible Symptoms:

• Pump will not cycle.

• Pump cycles, but produces no flow.

• Pump cycles, but flow 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), filling the pumping

chambers with liquid will prime the pump

in most cases.

What to Check: Excessive flooded

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 flow.

What to Check: Air supply pressure or

volume exceeds system head.

Corrective Action: Decrease inlet air

pressure and volume to the pump as

calculated on the published

PERFORMANCE CURVE. Pump is

cavitating the fluid by fast cycling.

What to Check: Undersized suction line.

Corrective Action: Meet or exceed

pump connection recommendations

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 surge suppressor.

What to Check: Blocked air exhaust

muffler.

Corrective Action: Remove muffler

screen, clean or de-ice and reinstall.

Refer to the Air Exhaust section of your

pump SERVICE MANUAL.

What to Check: Pumped fluid in air

exhaust muffler.

Corrective Action: Disassemble pump

chambers. Inspect for diaphragm rupture

or loose diaphragm 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 flush

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.

Refer to the pump SERVICE MANUAL

for disassembly instructions.

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. A 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

Refer to the enclosed Warren Rupp

Warranty Certificate.

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Sandpiper S20 Non-Metallic User Manual Page 13

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