Garland G56PT Installation And Operator's Manual

Also see for Air-Deck G56PB: Installation and operation instructions

Contents

Part # 1382670 (12/07)Page 14INTERMITTENT PILOT INSTRUCTIONS ContinuedNote: If the ground circuit path is incomplete the S86C, D, Gand H system control will allow one trial-for-ignition beforegoing into safety lockoutElectrical grounding connections at the pilot burner,ignitor/sensor and S86 must be clean and tight If lead wireis damaged or deteriorated, use only No 14 of 18 gauge,moisture-resistant, thermoplastic insulated wire with105C (221 F) minimum rating as replacement Excessivetemperature at the ceramic flame rod insulator can alsopermit electrical leakage to ground Examine the flame rodand mounting bracket, and correct if bent out of positionReplace Q345, Q346 Q348 or ignitor/sensor if insulator iscrackedCheck Spark Ignition CircuitThe electronic module and step-up transformer in the S86provides spark ignition at 15,000 Volts (open circuit) Thiscircuit can be checked at the S86 module as follows:1 Turn off the manual gas cock to prevent the flow of gas2 Disconnect the ignition cable at the S86 stud terminal toisolate the circuit from the pilot burner/ignitor/sensor,and prepare a short jumper lead using heavily insulatedwire, such as ignition cable3 Energize the S86, touch one end of the jumper firmly tothe S86 ground terminal (GND) Do not disconnect theexisting ground lead Move the free end slowly towardthe stud terminal to establish a spark and then pull thelead wire slowly away from the stud Note the length ofthe gap at which arcing stopsCAUTION: Do not touch either stripped end of jumper orstud terminal This is a very high voltage circuit and electricalshock can result Perform the test immediately uponenergizing the system – before the S86C,D,G goes into safetylockout and interrupts the spark circuit4 An arc length of 1/8” (3 2 mm) or more indicatessatisfactory voltage output Replace the S86 if not arc canbe established or the maximum gap is less then 1/8” (3 2mm), and the fuse and power to the S86 input terminalwas okayControl Module Flame Sensor CircuitThe control module provides AC power to the ignitor/sensorwhich the pilot burner flame rectifies to direct current If theflame signal back to the control module is not at least 1 5 μADC, the system will lockout The output of the flame sensingcircuit cannot be checked directly, so check the flamesensing circuit indirectly by checking the flame sensingcurrent from the ignitor/sensor to the control module asfollows1 Connect a meter (DC micrometer scale) in series withthe flame signal ground wire as shown below Use theHoneywell W136A Test Meter, or equivalent Disconnectthe ground wire at the control moduleConnect the red (positive) lead of the meter to the freeend of the ground wire Connect the black (negative)meter lead to the quick-connect ground terminal on thecontrol module2 Restart the system and read the meter The flame sensorcurrent must be at least 1 5μA, and the reading must besteady If the reading is below the value designated or thereading is unsteady, check the pilot flame and electricalconnections as described above Also, replace the ignitor/sensor if the ceramic insulator is cracked