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If so, then the thermocouple or thermopile is generating enough voltage to keep the safety valve open. Ever notice how civil DIY'ers are, generally? '', New members: Adding your location to your profile helps in many ways.--M--, valves" thread in the HVAC forum, someone wanted to know how a gas valve worked. Install sediment trap in the supply line to the gas control. Use only your hand to push down the reset button or turn the gas control knob. hb``b``r` LT, bBPQ%@AL;LiaP2l3 2 TO LIGHT THE PILOT BURNERSTOP! 0000010088 00000 n Do not secure conduit cover at this time. Assure the main gas supply valve is open and the pilot gas supply line is purged of air. Voltage drop across the switch terminals Burner on: 35 mv or less. 0000002167 00000 n 0000139520 00000 n If: Measure the open and closed thermocouple output voltages and compare to the acceptable range charts in the thermocouple specifications or in the Gas Controls Handbook. Attempted disassembly or repair may damage the gas control. 0000003926 00000 n Your system is quite old and somewhat unsafe, in that the pilot comes off ahead of the safety valve. Natural to LP gas conversion kit included with TRADELINE standard and slow-opening models. When the thermostat calls for heat, the first automatic valve and the second automatic valve operator open. EASY FIXES! Refer to Table 7 or 8 for factory-set nominaloutlet pressures and adjustment ranges. TABLE 6MAXIMUM LENGTH OF SUPPLEMENTARY LIMIT LEADWIRES WHEN USING Q309A THERMOCOUPLE. Pilot gas flows through a port in the ushing around the reset button shaft to the pilot burner. They include a safety shutoff, a manual valve, two automatic operators, a pressure regulator, a pilot adjustment, and a conduit cover (VR4200 only). After installation is complete, use these instructions to check out product operation. Outstanding! 0000011045 00000 n rev2023.3.3.43278. Install the Q340A asfollows: Connect ThermocoupleConnect thermocouple lead as shown in Fig. The gas control knob must be held depressed or the thermocouple must be heated sufficiently to hold the safety control valve open.ON: Permits main burner and pilot gas flow. Place gas control knob in PILOT position. If the pilot flame goes out, turn the gas control knob clockwise, If the pilot flame remains lit, turn the gas control knob counterclockwise. A consequence of unexpected shutdown. Ensure the main burner lights smoothly and without a flashback to the orifice and that all ports remain lit. One Q340A 36-inch thermocouple with adapters and clip. I have an old millivolt gas furnace that's stopped working. I'm wondering though if 750 mv is for all thermopiles..even my old one dating back to about the mid 50s??? Remove the burner access panel if provided on your appliance. Good info, thanks! Turn the gas control knob to the "On" position if the main burner does not turn on when the thermostat or controller is adjusted to start the appliance. 6 terminals + 2 jumpers = 4 effective terminals = 4 nodes. 0000068133 00000 n TABLE 7PRESSURE REGULATOR SPECIFICATION PRESSURES IN INCHES WC. The VR8200 Continuous Pilot Dual Automatic Valve Combination Gas Controls are used in gas-fired, standing pilot appliances. 00. The main burner should go off and the pilot should remain lit. If the switches are good, that sort of defaults to a bad gas valve. Appliances that may cycle 120,000 times annually should be checked monthly. With the main burner operating, check the gas control flow rate using the meter clocking method or check the gas pressure using a manometer connected to the gas control outlet pressure tap. 2 or 3) clockwise. Outlet pressure to the main burner increases gradually from 0 in. WARNINGFIRE OR EXPLOSION HAZARDS CAN CAUSE PROPERTY DAMAGE, SEVERE INJURY, OR DEATH. on Honeywell VR8200, VR4200 Combination Gas Controls User Guide, Honeywell Humidity Controllers User Guide, Honeywell S8910U Universal Hot Surface Ignition Module User Manual. Check the transformer. Adjust the thermostat several degrees higher than your current room temperature. Appliances that are used seasonally should be checked before shutdown and again before the next use. 0000002246 00000 n Do not try to light any appliance. %PDF-1.5 % Repeat after allowing the main burner to cool. The combination of spring pressure under the second automatic valve diaphragm and the lack of outlet pressure holds the diaphragm firmly closed. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. I suspect they are the "white" terminal and TH1. The servo pressure regulator monitors outlet pressure to provide n even the main burner gas flow. If the gas control knob or reset button will not operate by hand, the gas control should be replaced by a qualified service technician. Use an ac voltmeter to measure the voltage across terminals TH and TR. 0000060666 00000 n hbbd``b`~@q3` A@e:X 2 D !HWX m 40d# $ ? So, to diagnose a gas valve, first check to see if the pilot light is on. Remove seal over gas control inlet or outlet. Loss of power closes the automatic valves, but leaves the pilot lit, ready to return to normal service when power is restored. 0000023567 00000 n endstream endobj 11 0 obj <> endobj 12 0 obj <> endobj 13 0 obj <>stream Do not touch any electrical switch or use the phone. 0000137823 00000 n If pilot burner flame still goes out, measure the open and closed thermocouple output voltage. Gas valve troubleshooting looks for a problem. The Robertshaw - Uni-Line 700-500 and 710-500 Series millivolt gas valves are thermostatically actuated com- bination gas valves. Thermopile readings: With all wires connected, with the pilot on and burners off, the thermopile reading at the TP & THTP terminals should be ~325mV. A stuck valve could release gas into the air without regulation or the valve could cause the unit not to fire up at all. WHEN THE CALL FOR HEAT ENDSWhen the call for heat ends, the first automatic valve and the second automatic valve operator close, bypassing the regulator(s) and hutting ff the main burner. 250 items. If you smell gas, immediately shut off the manual valve in the gas piping to the appliance or, on LP, at the tank. LP to natural gas conversion kit available for standard and slow-opening models. This is an electrical connection and must be clean and dry. Honeywell Gas Valve Code 5 Whirlpool Water Heater Flammable Vapor Sensor Lockout How To Reset Honeywell Water Heater Pilot Keeps Going out - CLEAN THE FILTER GRATE! A stuck valve could release gas into the air without regulation or the valve could cause the unit not to fire up at all. 2 or 3) while you light the pilot burner. IF CHECKING GAS INPUT BY CLOCKING THE GAS METER: IF CHECKING GAS INPUT WITH A MANOMETER (PRESSURE GAUGE): The gas control outlet pressure should match the manifold pressure listed on the appliance nameplate. Supervision is needed by a licensed HVACR Tech while doing this as Experience and Apprenticeship garners Wisdom and Safety.Tool List- https://www.amazon.com/shop/acservicetechSupport- https://www.patreon.com/acservicetechWe've Partnered with TruTechTools.com! VR8200 for use with 24 Vac heating appliances and VR4200 for use with 120 . I have some pictures to help clarify what I have, a ThermoPILE system. 0000011836 00000 n The pilot stays lit fine and the thermopile generates about 360 millivolts, and there's no problem at the thermostat (checked voltage and shorting past it), but the main valve no longer opens. the manual gas control knob is in the ON position. Assure thermocouple connection to the power unit is tightened 1/4 turn beyond finger tight. A separate reset button must be held down to permit gas flow while lighting the pilot; can be pushed down only in the PILOT position. The PILOT position allows pilot burner gas flow only. Standard-, slow- and step-opening models available. 0000002189 00000 n 0000004324 00000 n Do not use a gas control set for natural gas on an LP gas system or a gas control set for LP gas on a natural gas system. Here are a couple pictures of the valve: Since this question was asked 1 year ago, I have to assume you have solved the problem. But it has been reliable for a long time. The pilot will remain lit, ready for return to normal service without relighting.COMPLETE SHUTDOWN: Turn the gas control knob clockwise to OFF. 0000042992 00000 n The three-position manual gas control knob has ON, OFF, and PILOT positions. Read the safety information in the WARNING.This appliance has a pilot burner, which must be lit by hand. TRADELINE model specifications are the same as those of standard models except as noted below.TRADELINE MODEL AVAILABLE: VR8200A Continuous Pilot Dual Automatic Combination Gas Control. 0000019920 00000 n 2). Intermittent use. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Your problem seems to involve large -- really large -- "industrial size" issues. 0000017038 00000 n *If higher than 35mv check connections and switch. The problem I'm having is very simple. As with the millivolt system, you'll be testing a series of components to locate the faulty part. Draw yourself the circuit. Capacity rated at 130 feet 3 /hour at 1-inch WC pressure drop [3.7 m 3 /hr at 0.25 kPa]. 394349 9/64 inch hex tool for flange assembly screws. http://www.robertshawtstats.com/spaw2/SiteContent/Files/faq/ControlTips-MillivoltSystems.pdf, http://en.wikipedia.org/wiki/American_wire_gauge, http://americanhvacparts.com/Merchantegory_Code=GV, http://americanhvacparts.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=GSV820A1047A&Category_Code=GV, http://en.wikipedia.org/wiki/Node_(circuits, http://www.emersonclimate.com/en-US/products/valves/Documents/0037-6264.pdf. The VR8200 Continuous Pilot Dual Automatic Valve Combination Gas Controls are used in gas-fired, standing pilot appliances. Check the power unit resistance. Insert the replacement spring with the tapered end down. Relight pilot burner and operate the system through one complete cycle to assure all controls operate properly. startxref Dont touch any electrical switch or use the phone. Making statements based on opinion; back them up with references or personal experience. Where the cost of an unexpected shutdown would be high, the system should be checked more ften. The screw to adjust the pilot gas is a needle valve. If resistance is outside of specifications listed, the gas valve must be replaced. Do not remove the existing window frame assembly. ny outlet pressure change is immediately reflected back to the pressure regulator diaphragm, which repositions to change the flow rate through the regulator valve and, thus, through the diaphragm-operated automatic valve. home heater furnace blower doesn't turn on [SOLVED], Goodman GM880804BNBA ignitor will not stay on. Install ThermocoupleThe Q340A Thermocouple (with adapters) is provided with SUPER TRADELINE models of the VR8200A. I forgot to mention that I got the main burner to light on 2 occassions by tapping on either the gas pipe before the main shutoff valve, or on the honeywell gas millivolt valve itself. With O-ring facing the gas control, align the screw holes on the gas control with the holes in the flange. The gas valve is the load.need to have current flow from one leg of the thermopilethrough the limit switch ( zero ohms ) througn the thermostat switch ( approx zero ohms on call for heat) through the coil of the valveand back to the other terminal of the generator. Honeywell Gas Valves. This is How to Wire the Thermopile to The 750mv Gas Valve for the Pilot and Main Gas Burners. Also found in certain gas space heaters and construction-site portable heaters. Therefore, this unit may not exactly match the listed specifications. 0000016105 00000 n Your local Honeywell Residential and Building Controls Sales Office (check white pages of your phone directory). Safety shutoff or pilot gas proves complete shutdown since the safety shutoff valve permits main burner and pilot gas flow. Filter. Replace the thermocouple if voltages are outside the acceptable range. Use new, properly reamed pipe free from chips. 0000018497 00000 n Such heavy cycling wears out the gas control in one to two years. If the reading is higher,magnet is defective therefore Change the Valve - Do not try to repair.