Potter VSR-AT Troubleshooting Technical Bulletin

March 12 2013 the Auto Test feature is activated a miniature servo motor on the flowswitch moves the trip stem paddle assembly the UL required 10 gpm flow rate The trip stem is held in this position until the retard time expires When retard time expires the trip stem is released The time it takes for the trip stem to return to its normal position is to ensure the integrity of the trip stem paddle assembly as well as ensuring that the pipe is full of water A completion of the Auto Test will momentarily activate both sets of normally open contacts on the flowswitch for 7 seconds the Auto Test detects a problem with the trip stem paddle assembly or if there is no water in the pipe neither normally contact will operate The flowswitch will indicate a trouble condition at the ATC test switch and transmit a trouble to the fire alarm control panel panel stays in trouble the wiring The zone of the fire panel should be wired to the VSR AT as shown on pg 4 of the 5401239 datasheet in Figure 1 below The End of Line Resistor should be installed as shown across the terminals marked C and the to the right of C which is indicated by the other end of the resistor symbol The zone of the fire panel connects to terminals marked C and NO NO C NO GND LED SWITCH VDC PWR 1 next zone on panel NO and End of Line Resistor terminals are connected internally by a normally energized relay A loss of power or AutoTest causes the relay to drop out and initiates a trouble at the fire panel only way to clear the trouble on the fire panel is to conduct a successful AutoTest using the ATC test switch or other method Conducting an actual waterflow test will put the panel in alarm but will not clear the trouble fails the AutoTest there water in the pipe VSR AT will fail the AutoTest if the pipe it is installed on is not full of water the return spring on the VSR AT been adjusted spring has been factory set and should not be adjusted in the field Refer to Figures 5 6 of this document to the factory spring setting If the spring is not at the factory setting turn the spring adjustment screw until the spring setting is restored Electric Signal Company LLC St Louis MO Phone 800 325 3936 www pottersignal com PAGE 1 OF 4 Troubleshooting Technical Bulletinfirealarmresources com the cam on the AutoTest motor stuck on the trip stem the cam does not travel properly and the cam appears to be jammed by the trip stem the trip stem set screw should adjusted This may occasionally happen if the electronic retard was removed from the base and replaced See 1 2 and 3 of this document To adjust the cam set screw it may be necessary to remove the clear cover guard The clear cover guard can be re by unscrewing the mounting screw that holds it in place Using a 1.3 mm hex screwdriver loosen the trip stem set screw a turn in the counter clockwise direction See Fig Retest the VSR AT Auto Test Function this resolves the jamming issue and the test results are favorable then the unit is ready for use Replace the clear guard and verify that the unit again tests normally not then try repeating steps 2 through 4 the issue is not resolved after six turn adjustments 1 1 2 full turns then replace the electronic assembly with a one The electronic assembly might be defective in Position A in Position B Stem in 2 3 Electric Signal Company LLC St Louis MO Phone 800 325 3936 www pottersignal com PAGE 2 OF 4 Troubleshooting Technical Bulletinfirealarmresources com shown jammed by Trip It is unable to move to B 4 Cover Stem Set Hex Head needed Screw 5 Spring Adjustment Electric Signal Company LLC St Louis MO Phone 800 325 3936 www pottersignal com PAGE 3 OF 4 Troubleshooting Technical Bulletinfirealarmresources com 6 Mark 7 Spring set to Mark Electric Signal Company LLC St Louis MO Phone 800 325 3936 www pottersignal com PAGE 4 OF 4 Troubleshooting Technical Bulletinfirealarmresources com