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9.3.7 Solenoid Valve Testing
Tools Required:
7/16” wrench, Flat-blade screwdriver, 120VAC capable Digital Multi-Meter and alligator clips or
jumper wires.
Solenoid Valve Function:
Blocks flow of the fuel from the preheater to the nozzle block when burner is not operating, and
allows for flow during burner operation. The valve is a Normally Closed Valve.
Note:
During this test, if the Solenoid does not function as stated, call Technical Services for
assistance, or Customer Service to order a new Solenoid Valve.
Make sure the Solenoid has recently been maintained. Neglect will negatively
affect the results of testing.
During a portion of this test, high voltage electrical components will be
energized. Only a certified electrician is to perform the following procedures, and with
extreme caution.
Procedure:
1.
Unplug the burner plug from its receptacle. Unplug preheater.
2.
Remove the primary control cover plate, allowing access to the terminal strip under
controller.
3.
Find the solenoid valve wires, purple and white of the same gauge, and remove from
terminal strip.
4.
Using a multi-meter, test for continuity across the solenoid wires. There should be
continuity across wires.
5.
Leaving the purple and white wires disconnected, loosely replace the primary cover.
6.
Remove copper tubing from between the solenoid and the nozzle (have cup or
disposable towel ready to catch oil).
7.
Wear Safety Glasses for the following steps!
8.
Plug in the burner and jumper the T-T terminals.
9.
After the burner starts, jumper the F-F terminals.
10.
Holding the cup near the open end of the solenoid valve, observe to see if the valve
leaks while the burner is running. The valve should not leak during operation.
11.
Remove the T-T and F-F terminal jumpers.
12.
Unplug the burner plug from its receptacle. Reconnect the solenoid to the terminal strip.
Plug the burner back in.
13.
Apply the jumpers as in steps 9 and 10.
14.
The solenoid should open and oil should flow out of the solenoid.
a.
If oil does not flow, verify 105-120VAC is supplied to the solenoid from the
terminal strip.
15.
Remove the jumpers from the T-T terminals, then the F-F terminals and unplug the
burner.
16.
Return the wires, primary, copper and preheater plug to their operational positions.
17.
Plug in the burner.
