Suntec Industries | Questions de la FAQ Archive - Suntec Industries

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F.A.Q

Pump is not running

Check if	Possible explanation	Solution
....the motor is turning.
YES	Explication possible	Motor coupling is defective or has came loose	Solution	Check coupling and repair or replace as appropriate.
NO	Explication possible	Pump has seized	Solution	Remove pump cover and check pump. If rust and / or an abnormal amount of dirt are found, check tank for water and check condition of filters. Replace pump.
NO	Explication possible	Motor does not work	Solution	Test motor and connections and repair or replace if necessary, having first examined the pump.

Pump is running but does not deliver oil

Check if	Possible explanation	Solution
…oil flows out of the high-pressure port when it is loosened.
YES	Explication possible	Nozzle or in-line solenoid valve is blocked	Solution	Inspect nozzle and valve for blockage (dirt, grit, fuel,...)
YES	Explication possible	Solenoid valve or pressure regulator is defective	Solution	Switch on the coil and check for magnetic pull. If there is no pull, check the current. If the current is OK, change the coil. When the coil is in order, check the pressure regulating valve or replace the pump.
…no oil flows from the high-pressure port when it is loosened.
NO	Explication possible	Oil level in tank is low	Solution	Check tank and refill.
	Explication possible	Inlet pipe valve is closed	Solution	Open the valve.
	Explication possible	On a new installation, the check valve is the wrong way round	Solution	Check that all valves are facing the right way.
…and vacuum gauge shows a high vacuum.
YES	Explication possible	Blockage up-stream	Solution	Check in-line filter and non-return valve.
YES	Explication possible	Pipe is undersized	Solution	Check pipe dimensions.
…no oil flows from the high-pressure port when it is loosened.
…and vacuum gauge shows a low vacuum.
YES	Explication possible	Pump filter is plugged	Solution	Remove pump cover and check filter condition.
	Explication possible	Air leak	Solution	Check the tightness of pump cover (especially if the filter has recently been changed/cleaned) and check the cover gasket.
	Explication possible	Pipe is oversized	Solution	Very important for one-pipe systems. Check pipe diameter.
	Explication possible	Pump rotates in a wrong way	Solution	If the installation is new, be sure that motor and pump rotation are the same. A pump turning in the wrong direction can not draw oil.
	Explication possible	By-pass plug is missing in two-pipe installation	Solution	Check if the by-pass plug is installed.
	Explication possible	Suction and return lines have been swapped	Solution	Check they have been correctly fitted.
	Explication possible	Pump is worn out	Solution	Check this by carrying out a pressure test.

Nozzle pressure is too high / too low

Check if	Possible explanation	Solution
…the pressure can be adjusted.
…and pressure gauge shows a low pressure.
YES	Explication possible	Pump is not properly sized for the nozzle performance (remembering fuel viscosity) or any hydraulic attachments i.e. hydraulically opened air flap	Solution	Change pump or nozzle as appropriate.
YES	Explication possible	Pump is worn out	Solution	Check this by carrying out a pressure test. Replace pump.
…and pressure gauge shows a high pressure.
YES	Explication possible	Dirt in regulating valve	Solution	Dismantle pressure regulator or replace pump.
…the pressure can be adjusted.
…and the pump pressure oscillates.
YES	Explication possible	Air in the oil	Solution	Check vacuum does not exceed 0,45 bars. Check suction line for leaks.
	Explication possible	Pressure regulating valve is defective or clogged	Solution	Dismantle pressure regulator or replace pump.
	Explication possible	Motor coupling is slipping	Solution	Check coupling and check for speed variations.
…the pressure can not be adjusted.
…and the pressure is constantly too high or too low.
YES	Explication possible	Pressure regulating valve is defective or clogged	Solution	Dismantle pressure regulator or replace pump.
NO	Explication possible	Pressure gauge is defective or incorrectly installed	Solution	Check pressure gauge. Bleed when fitting.

The oil pump makes noise

Check if	Possible explanation	Solution
…an increasingly loud whine is coming from the pump.
YES	Explication possible	Vacuum is too high (check with a vacuum gauge)	Solution	Check for closed valves, blocked filters, check valves that are stuck.
…the pump generates a cracking noise and the pressure gauge oscillates.
YES	Explication possible	Air bubbles in the suction line	Solution	Check suction line for leaks. Bleed pump if installation is one-pipe.

Excessive pump temperature

Check if	Possible explanation	Solution
...a small nozzle flow is used with a one-pipe installation.
YES	Explication possible	Heat build-up from recirculation in pump plus heat radiated from motor etc.	Solution	Convert to two-pipe or fit filter upstream from pump with return from pump to filter. This circulation outside of the burner will help to cool the system.