Nova-Tech LMI Roytronic Excel Series AD Metering Pump - Manual (Page 40)

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PROBLEM POSSIBLE CAUSE SOLUTION
Pump Will Not Prime 1. Pump not turned on or plugged in. 1. Turn on pump/plug in pump.
2. Output dials not set properly. 2. Always prime pump with speed and
stroke at 100%.
3. Foot Valve not in vertical position on
bottom of tank. 3. Foot Valve must be vertical (see
Foot Valve Installation, Section 3.7).
4. Pump suction lift too high. 4. Maximum suction lift is 5 ft (1.5 m).
Pumps with High Viscosity Liquid
Handling Assemblies require flooded
suction.
5. Suction tubing is curved or coiled in
tank. 5. Suction tubing must be vertical. Use
LMI ceramic weight supplied with
pump (see Section 3.7).
6. Fittings are over tightened. 6. Do not overtighten fittings. This
causes seal rings to distort and not
seat properly which causes pump to
leak back or lose prime.
7. Air trap in suction valve tubing. 7. Suction tubing should be as
vertical as possible. AVOID FALSE
FLOODED SUCTION!
(see Section 3.2.1).
8. Too much pressure at discharge.
(Pumps without multi-function
valve.) 8. Shut off valves in pressurized line.
Disconnect tubing at injection check
valve (see Priming Section 4.2).
When pump is primed, reconnect
discharge tubing.
9. Air leak around fitting. 9. Check for missing or damaged
O-rings at ends of fittings.
Pump Loses Prime 1. Solution container ran dry. 1. Refill container with solution and
reprime (see Section 4.2).
2. Foot Valve is not in a vertical
position on the bottom of the tank. 2. Foot Valve must be vertical (see
Foot Valve Installation, Section 3.7).
3. Pump suction lift is too high. 3. Maximum suction lift is 5 ft (1.5 m).
Pumps with High Viscosity Liquid
Handling Assemblies require flooded
suction.
4. Suction tubing is curved or coiled
in tank. 4. Suction tubing must be vertical. Use
LMI ceramic weight supplied with
pump (see Section 3.7).
5. Fittings are over tightened. 5. DO NOT OVERTIGHTEN FITTINGS.
This causes seal rings to distort
and not seat properly which caused
pump to leak back or lose prime.
6. Air trap in suction valve tubing. 6. Suction tubing should be as
vertical as possible. AVOID FALSE
FLOODED SUCTION!
(see Section 3.2.1).
7. Air leak on suction side. 7. Check for pinholes, cracks. Replace
if necessary.
7.0 Troubleshooting
TROUBLESHOOTING