Troubleshooting

General Pump Problems

Noisy pump
Check for air leaks
Check for high vacuum condition, (10 in. or less for single stage and 15 in. or less for two stage pumps) 

Pump will not prime
Measure suction inlet vacuum, should not exceed 15 in. of vacuum
Vent air from unit by opening vent plug or loosening gauge port plug
Check that all plugs and suction line connections are airtight
Be certain by-pass plug is in position on two pipe installation
Use adequate size suction line
Be certain suction line filter or strainer has adequate capacity

Rumble coming from burner at start-up
Check cutoff at pump or external solenoid

Oil leaking from pump cover gasket(s) or blown cover gasket(s)
Check for correct pump rotation

Pump looses prime after an extended shutdown
Check all pipe connections for air leaks
Return line not submersed in oil
In supply pump applications the return loop my need a vacuum breaker installed to prevent siphoning

Vacuum coming from return port on oil pump(two pipe installation)
By-pass plug not installed
If by-pass plug is installed check for blocked suction line

Pump seizes at start-up, blows seal, damage to discharge pressure gauge
Check for blocked return line or drain port from pump
By-pass plug should be removed on single pipe installation 

Supply Pump Problems

Supply unit does not run
Check motor electrical connections
Check for obstruction in return line such as a reversed check valve
Check circuit breaker and correct possible overload

Unit runs, but no oil reaches supply pump
Measure suction inlet vacuum, should not exceed 15 in. of vacuum
Check that all plugs and suction line connections are airtight
Be certain by-pass plug is in position
Use adequate size suction line
Vent air from unit by opening vent plug or loosening gauge port plug
Be certain suction line filter or strainer has adequate capacity

Unit supplies oil to distribution system, but no delivery of oil at OSV valves
Confirm specified unit can provide needed vertical discharge pressure
Check that all supply line connections are air and oil tight
Use adequate size supply line
Minimize supply line restrictions
Prime pump and purge supply lines of air
Check pump pressure settings

Oil delivery at OSV valves, but burners do not fire
Confirm specified unit can provide needed capacity
(Size to firing rate for single pipe burners or size to gear set capacity for two piped burners)
In pressurized system, adjust pressure to develop a reading of 10-15 PSI at the most remote or highest burner
In open loop system, install standpipe, back pressure valve, vacuum breaker or over-sized drop pipe
Check to assure that pressures at OSV inlet does not exceed maximum of 60 PSI
Check for leaking or damaged OSV
Check for line failure between OSV and burner pump
Check burner for fuel pump failure or ignition problems

Burner pump seal damaged
Install OSV to assure pressure at burner pump does not exceed 3 PSI
Install pressure relief valve if entrapment condition is suspected

Pressure increases in supply line after shutdown
Check to assure that pressures at OSV inlet does not exceed maximum of 60 PSI
Install pressure relief valve if entrapment condition is suspected

Oil Safety Valve Problems

Oil Safety Valve does not open
Too much pressure at inlet of valve
Flow exceeds recommended flow rate for valve.
Entrapment condition (expansion of oil in supply line)
Check for air leaks between the OSV valve and burner pump


 



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