Troubleshooting - LMI Excel XR Series Installation & Operation Manual

6.0 Troubleshooting

PROBLEM
Pump Will Not Prime
Pump Loses Prime
POSSIBLE CAUSE
1. Pump not turned on or plugged in
2. Foot Valve not in vertical position on
bottom of tank
3. Pump suction lift too high
4. Suction tubing is curved or coiled in
tank
5. Fittings are overtightened
6. Air trap in suction valve tubing
7. Too much pressure at discharge
8. Air leak around fitting
1. Solution container ran dry
2. Foot Valve is not in a vertical position
on the bottom of the tank
3. Pump suction lift is too high
4. Suction tubing is curved or coiled in
tank
TROUBLESHOOTING
SOLUTION
1. Turn on pump/plug in pump
2. Foot valve must be vertical (see
section 3.4 Foot Valve / Suction Tubing
Installation)
3. Maximum suction lift, specified in
section 2.1 Specifications. High
viscosity liquid handling assemblies
require flooded suction
4. Suction tubing must be vertical. Use
LMI ceramic weight supplied with pump
(see section 3.4 Foot Valve / Suction
Tubing Installation)
5. DO NOT OVERTIGHTEN FITTINGS!
This causes seal rings to distort and not
seat properly which causes pump to
leak back or lose prime
6. Suction tubing should be as vertical
as possible. AVOID FALSE FLOODED
SUCTION! (see section 3.2.1 Flooded
Suction)
7. Shut off valves in pressurized line.
Disconnect tubing at injection check
valve (see section 4.4.1 Prime
Settings). When pump is primed,
reconnect discharge tubing
8. Check for missing or damaged O-
rings at ends of fittings
1. Refill container with solution and re-
prime (see Section 4.4.1 Prime
Settings)
2. Foot Valve must be vertical (see
section 3.4 Foot Valve / Suction Tubing
Installation)
3. Maximum suction lift, specified in
section 2.1 Specifications. High
viscosity liquid handling assemblies
require flooded suction
4. Suction tubing must be vertical. Use
LMI ceramic weight supplied with pump
(see section 3.4 Foot Valve / Suction
Tubing Installation)
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