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TROUBLESHOOTING AND REPAIR | ||
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GAS SOLENOID TEST
(continued)
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FIGURE F.2 - GAS SOLENOID
FIGURE F.3 – LEADS 552, 552B & 553
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GAS SOLENOID
Located on case back
Coil measures
21 ohms GAS SOLENOID
Off = 0 VDC
OCV = 59 VDC
On = 7.7 VDC
553
552
552B
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TEST PROCEDURE
1.Remove the input power from the LF72/LF74 unit.
2.Using the 5/16 nut driver, remove the 5 screws holding the cover.
3.Locate the gas solenoid (FIG F.2) on the back of the feeder.
4.Apply the correct (42VAC) input voltage to the unit.
5.While pressing the gas purge button or activating the gun trigger, check for approximately 8VDC at the solenoid leads (FIG F.3). If the 8VDC is present the solenoid should activate. If the 8VDC is present but the solenoid does not activate the solenoid may be faulty.
6.If the 8VDC is missing or low, check the leads and connections between the solenoid and the control board. See the wiring diagram. If the leads and connections are ok, the control board may be faulty.
7.Normal solenoid coil resistance is 21 ohms.
8.The solenoid can be further checked by disconnecting the leads and applying 12VDC directly to the terminals. If the solenoid does not activate the solenoid is faulty.
9.Reconnect the leads and replace the cover.
