honeywell millivolt gas valve troubleshooting

Regulator Cap Conversion Screw Pressure Regulator Housing, Cleaning the Standing Pilot Control System. Kit for conversion from LP to natural gas is available for standard and slow opening models. 0000062529 00000 n Furnace gas valves cannot be repaired. on Honeywell VR8200, VR4200 Combination Gas Controls User Guide, Honeywell Humidity Controllers User Guide, Honeywell S8910U Universal Hot Surface Ignition Module User Manual. I would verify the valve type - It would either be the SIT 820 or the Honeywell VS8420. The problem I'm having is very simple. If it then "clicks" meaning it is opening with voltage supplied to it than most likely it's not the gas valve which is bad. For push-in clip-type pilot burners: From beneath, insert the tip of the Q340 into the hole or barrel of the pilot burner. . Never use any tools. Force or attempted repair may result in fire or explosion. MILLIVOLT SYSTEMS Millivolt systems provide their own power, so do not require outside battery power or line voltage to operate. Troubleshooting Honeywell Millivolt Valve, Troubleshooting the Gas Control System, Troubleshooting the Gas Control System, Vermont Castings, Majestic Products: DVR33, SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION TO LIGHT THE PILOT BURNERSTOP! thatguy, I hear you. 0000010088 00000 n WIRINGFollow the wiring instructions furnished by the appliance manufacturer, if available, or use the general instructions provided below. wc [0.9 kPa] outlet pressure). 0000031335 00000 n 0000003696 00000 n 0000006449 00000 n What you are experiencing is why such adjustments are discouraged! 0000005081 00000 n Do not overtighten. 0000027628 00000 n 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. The diaphragm-operated second automatic valve opens under the control of the regulator and closes if gas or power supply is interrupted. Do not force the gas control knob on the appliance. For screen reader problems with this website, please call 1-800-430 . Advertisement Honeywell VR8200, VR4200 Combination Gas Controls, Honeywell C437F1052 Auto Recycle Gas/ Air Pressure Switch Installation Guide, Honeywell Portable Single Gas Detector User Manual, RYOBI RY802925 PSI Gas Pressure Washer User Guide. Therefore, this unit may not exactly match the listed specifications. Only the gas valve manufacturer or someone certified by the manufacturer of the gas valve can make repairs. Attempted disassembly or repair may damage the gas control. WARNING!FIRE OR EXPLOSION HAZARDS CAN CAUSE PROPERTY DAMAGE, SEVERE INJURY, OR DEATH. %PDF-1.5 % If tubing is used, ensure the ends are square, deburred and clean. rating 1/2 psi [3.5 kPa] inlet pressure.PRESSURE REGULATION: See Table 1. I was just wondering about this the other day. 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! PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Refer to Table 7 or 8 for factory-set nominaloutlet pressures and adjustment ranges. The boiler comes on twice a day - morning and night. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Do not remove seals until ready to connect piping.Follow the appliance manufacturer instructions if available; otherwise, use the instructions provided below. Install control and appliance according to appliance manufacturer instructions. Dont touch any electrical switch or use the phone. Did this satellite streak past the Hubble Space Telescope so close that it was out of focus? A place where magic is studied and practiced? The second automatic valve diaphragm, controlled by the servo pressure regulator, opens and adjusts gas flow as long as the system is powered and the pilot is burning. 30 0 obj <>/Filter/FlateDecode/ID[<07B8336975034BD12756FE90D2FD37D3>]/Index[10 37]/Info 9 0 R/Length 96/Prev 25390/Root 11 0 R/Size 47/Type/XRef/W[1 2 1]>>stream [10 to 13 mm] of the thermocouple tip. Cycle the main burner several times, allowing at least 30 seconds between cycles for the regulator to resume the step function. . WARNINGFIRE OR EXPLOSION HAZARDS CAN CAUSE PROPERTY DAMAGE, SEVERE INJURY, OR DEATH. Choose the appropriate flange for your application. The gas control knob is hard to turn or push down, or it fails to pop back up when released. 2, 3 and 11, 12. Refer to Fig. The VR8200 Continuous Pilot Dual Automatic Valve Combination Gas Controls are used in gas-fired, standing pilot appliances. I recommend you call a heating expert. 0000039877 00000 n 0000003373 00000 n Taps are 1/8 inch NPT with a plug containing recess for 3/16 inch Allen wrench.PRESSURE RATING: A.G.A. Is a PhD visitor considered as a visiting scholar? If the gas control knob or reset button will not operate by hand, the gas control should be replaced by a qualified service technician. One Q340A 36-inch thermocouple with adapters and clip. Always install sediment trap in gas supply line to prevent contamination of gas control. 0000002778 00000 n Home Honeywell Honeywell VR8200, VR4200 Combination Gas Controls User Guide. Mount gas control high enough above cabinet bottom to avoid exposure to flooding or splashing water. This is a very useful thread and am learning a lot from it partly because of my situation with my current Weil McClain boiler. To avoid the dangerous accumulation of fuel gas, turn off the gas supply at the appliance service valve before starting the installation, and perform Gas Leak Test after completion of installation. ECO connector included with some models: also available as an accessory. For the VR4200, when the gas control is installed external to the appliance, install the conduit cover on the conduit fitting. Turn the gas control knob (Figs. startxref You should NOT short out the t'stat terminals to check it. The pilot works fine but the main burner does not come on by the wall mounted thermostat or the manual on/off switch. You must log in or register to reply here. As for the gas valve it is probably a "general controls" valve but any 800 millivolt gas valve can be used as a replacement. If you then smell gas in the appliance area or near the floor in an LP installation, immediately shut off the manual valve in the gas piping to the appliance or, with LP, shut off at the tank. If so, how close was it? I have an old millivolt gas furnace that's stopped working. Never use pipe compound. Several troubleshooting methods applied to and including bypassing the thermostat but failed to yield any results. 0000137800 00000 n INSTRUCTIONS TO THE HOMEOWNER FOR YOUR SAFETY, READ BEFORE OPERATING WARNING!IF YOU DO NOT FOLLOW THE WARNINGS BELOW AND THE LIGHTING INSTRUCTIONS EXACTLY, A FIRE OR EXPLOSION CAN RESULT WITH PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. This diverts gas flow from the automatic valve diaphragm and causes a reduction of pressure on the underside of this diaphragm. If tubing is used, obtain a tube-to-pipe coupling to connect the tubing to the gas control. Contact your Honeywell sales representative to request a gas valve with corrosion-resistant construction. TABLE 6MAXIMUM LENGTH OF SUPPLEMENTARY LIMIT LEADWIRES WHEN USING Q309A THERMOCOUPLE. We come out with new videos every few days from my job sites, service calls, and the training shop! . The power unit drops out, closing the safety valve and stopping all gas flow through the control.With the loss of outlet pressure, the second automatic valve closes and is held closed by spring pressure on the diaphragm. This is a legacy product document supported by Resideo.This product is no longer manufactured. Where these instructions differ from the appliance manufacturer, follow the appliance manufacturer instructions.All wiring including 1/4 in. It does so for the very first instance both in the morning and night but thereafter, the pilot just stays lit and the chambers aren't lit or heating the house. The low-pressureregulator maintains outlet pressure at the preset step rate for several seconds. 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. It only takes a minute to sign up. 0000126162 00000 n Follow these warnings exactly: CAUTIONNever apply a jumper across or short the valve coil terminals. The gas valve part numbe read more 0000002263 00000 n Works with the majority of millivolt gas valves; Push-in clip for easy installation included; . 13. Ensure the installer is a trained, experienced service technician. 0000004324 00000 n You may have to wiggle it a bit before it comes loose. If the O-ring is not attached or is missing, do not use the flange. I would not work on it, without completely replaceing the gas control system, and the furnace may not be worth that expense. Release button; the pilot should remain lit. 0000098789 00000 n 0000034533 00000 n 0000012695 00000 n Do not try to light any appliance. Safety shutoff or pilot gas proves complete shutdown since the safety shutoff valve permits main burner and pilot gas flow. Repeat after allowing the main burner to cool. Troubleshooting an IID control system calls for an AC voltmeter with a 220-volt range or greater. 0000026478 00000 n 0000126186 00000 n 0000139215 00000 n 0000011836 00000 n If necessary, adjust the pressure regulator to match the appliance rating. 0000044905 00000 n Combination screw and quick-connect terminals on TRADELINE models. These Videos are all part of our Training Series on HVACR Service, Installation, Preventative Maintenance, General Knowledge, and Tips. Set the thermostat to the lowest setting and shut off the electric power to the appliance. The Thermopile, energized by the pilot flame, generates sufficient power to operate the gas valve and on/off switch. Thus, the flow of gas through the second automatic valve is increased, and outlet pressure rises to the desired level.Slow-Opening Pressure Regulation (VR8200H and VR4200H); Delayed and Slow-opening Regulation (VR8200J)Slow-opening gas controls function the same as standard models except that when the thermostat calls for heat, the second automatic alve pens gradually. 0000008225 00000 n The ON position allows pilot burner and main burner gas low under control of the thermostat and the two automatic valves. WARNING!FIRE OR EXPLOSION HAZARDS CAN CAUSE PROPERTY DAMAGE, SEVERE INJURY OR DEATH.Do not disassemble the gas control; it contains no replaceable components. Pilot gas flows through a port in the ushing around the reset button shaft to the pilot burner. 1/2 in. When the pilot goes out or becomes too small to sustain normal ignition. Dusty, wet, or corrosive environment. Use conversion factors in Table 2 to convert to capacities for other gases. CHECK SAFETY SHUTDOWN PERFORMANCEWARNING!FIRE OR EXPLOSION HAZARDS CAN CAUSE PROPERTY DAMAGE, SEVERE INJURY, OR DEATH.Perform the safety shutdown test any time work is done on a gas system. They include a safety shutoff, a manual valve, two automatic operators, a pressure regulator, a pilot adjustment, and a conduit cover (VR4200 only). 5. Do I need a thermal expansion tank if I already have a pressure tank? 0000001836 00000 n 0000041780 00000 n See Accessories.CAPACITY: 130 feet 3 /hour [4.2 meters 3 /hour]. Standard-, slow- and step-opening models available. 0000012806 00000 n Turn the pressure regulator adjustment screw clockwise. trailer TRADELINE MODELSTRADELINE models are selected and packaged to provide ease of stocking, ease of handling and maximum replacement value. Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? Always install horizontal venting on a level plane. 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. Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin?). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Insert and tighten the screws provided with the flange. Exposure to water, dirt, chemicals, and heat can damage the gas control and shut down the control system. How do you ensure that a red herring doesn't violate Chekhov's gun? This type of gas valve used a single thermocouple. See Table 1 for model specifications.SUPPLY VOLTAGE:VR4200: 120 Vac, 60 Hz.VR8200: 24 Vac, 60 Hz. Natural to LP gas conversion kit available for nonTRADELINE standard and slow-opening models. 7.). This includes a WIRING DIAGRAM. 0000004302 00000 n Gas valve troubleshooting looks for a problem. The combination of spring pressure under the second automatic valve diaphragm and the lack of outlet pressure holds the diaphragm firmly closed. 46 0 obj <>stream Such heavy cycling wears out the gas control in one to two years. first the 360 millivolts you show should have been 750 to 800 millivolts since this is a pilot generator. If the inlet pressure is in the normal range (refer to Table 7 or 8), replace the gas control. 0000007879 00000 n A. Thermocouple-Only: Found in: Most gas log sets with standard safety pilot knob control. IMPORTANT: The specifications given in this publication do not include normal manufacturing tolerances. If it goes out, repeat steps 36. 1/4-inch male quick-connect terminals for electrical connections. Replace the thermocouple if voltages are outside the acceptable range. 0000049205 00000 n 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. 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. Cover gas control if the appliance is cleaned with water, steam, or chemicals to avoid dust and grease accumulation. Filter. ' b1?T3/0.!0s.2c7oDp!c{|87*G2s>y~O9SNF. Tighten only 1/4 turn beyond finger tight to give good electrical continuity. See Fig. Hold each tester wand on the multimeter to one of the terminals on the gas valve. Step-Opening Pressure Regulation (VR8200C,P andVR4200P)Step-opening gas controls actually combine two pressure regulators, one for the low pressure and one for the full-rate pressure. Thermopile readings: With all wires connected, with the pilot on and burners off, the thermopile reading at the TP & THTP terminals should be ~325mV. 44 0 obj <>stream Check the regulator setting either with a manometer or by clocking the gas meter. Square off and remove burrs from the end of the tubing. %PDF-1.3 % Assure thermocouple connection to the power unit is tightened 1/4 turn beyond finger tight. Loss of power closes the automatic valves, but leaves the pilot lit, ready to return to normal service when power is restored. It must measure at least 19.5VAC with the igniter powered. Flanges available for 3/8, 1/2 and 3/4 inch straight and 90 angle connection. Take care when handling the refractory panels as they are fragile until held in place and supported. Check the pilot burner flame adjustment. The next time the valve fails to open you need to measure the voltage across this valve coil, or, better, the current through it.. What gauge number wire and what length do you use to your t'stat? Because gas is involved, problems with gas valves are a major safety concern. For a better experience, please enable JavaScript in your browser before proceeding. 0000004689 00000 n 0000006740 00000 n 0000027369 00000 n Disconnect power supply before wiring to prevent electrical shock or equipment damage. Wait five minutes to allow any gas in the combustion chamber to vent. The Robertshaw - Uni-Line 700-500 and 710-500 Series millivolt gas valves are thermostatically actuated com- bination gas valves. 0000013062 00000 n 4 41 If any particular ad is your REASON for blocking ads, please let us know. 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. Readings outside this range indicate the gas valve is defective and must be replaced. Check the power supply rating on the valve and make sure it matches the available supply. Hold down the gas control knob about one minute, then release. home heater furnace blower doesn't turn on [SOLVED], Goodman GM880804BNBA ignitor will not stay on. Use only your hand to push down the reset button or turn the gas control knob. 0000012011 00000 n *If higher than 35mv check connections and switch. Terminal block color-coded beige.THERMOSTAT HEAT ANTICIPATOR SETTING:VR4200: 0.1AVR8200: 0.5ATYPE OF GAS: VR8200 and VR4200 set up for naturalgas includes a 393691 LP Conversion Kit. A bad gas valve in a Honeywell appliance such as a water heater or furnace that is powered by natural gas can go bad and affect the performance of the unit. Category: HVAC. Install sediment trap in the supply line to the gas control. Comment * document.getElementById("comment").setAttribute("id","aac0d23d4efdcbcc5f3480c59cc4754f");document.getElementById("afe6277d1c").setAttribute("id","comment"); Save my name, email, and website in this browser for the next time I comment. While taking a Millivolt reading on a safety magnet, disconnect thermocouple & wires from the valve. This is How to Wire the Thermopile to The 750mv Gas Valve for the Pilot and Main Gas Burners. For a better experience, please enable JavaScript in your browser before proceeding. Millivolt systems have been the industry standard for decades, and are in some ways simpler to troubleshoot than electronic ignition systems. If the voltage is dead or not as rated, replace the valve. In many such applications, particularly commercial cooking, the equipment operates 100,000-200,000 cycles per year. Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from any purchases after clicking through. If you'd like to support the site, please allow ads. 0000018745 00000 n They include a safety shutoff, a manual valve, two automatic operators, a pressure regulator, a pilot adjustment, and a conduit cover (VR4200 only). Check the wiring between the thermocouple and the gas control valve operator. Ensure the main burner lights smoothly and without a flashback to the orifice and that all ports remain lit. Remove the pilot adjustment cover screw. hW[o8+ID:BZ(gENRCD'$( m;\{fgc3llFQl%|xI!>-88zzhb|AtJOr[b4-BFS! Now I'm sure my problem's the thermopile. 15. Mutually exclusive execution using std::atomic? 0000028628 00000 n Troubleshooting the valve and looking for known common issues will give you peace of mind by ensuring the safe operation of your Honeywell appliance. It is no longer manufactured Pressure Switch Installation Addendum, Gas Detection Quick Reference GuideHoneywell BW Solo Portable Single gas Detector 2020, Oct 23 G05-4001-000-RevC Overview Contact, RYOBI RY802925 PSI Gas Pressure Washer WARNING: This Quick Reference Guide is not a substitute for reading the, KitchenAid Gas Range User Manual - Optimized PDF KitchenAid Gas Range User Manual - Original PDF, Your email address will not be published. Ensure the ambient temperature does not exceed the ambient temperature ratings for each component. Allow the appliance to run through one complete cycle to ensure that the controls are functioning in the correct manner. Assure the main burner primary air supply is properly adjusted for complete combustion (refer to the appliance manufacturer instructions). quick-connect terminals, must comply with applicable electrical codes and ordinances.Disconnect power supply before making wiring connections to prevent electrical shock or equipment damage. If pilot burner flame still goes out, measure the open and closed thermocouple output voltage. honeywell millivolt gas valve troubleshooting From Gas Control Valve 1- Turn main gas on and proceed to next step. 0000062506 00000 n The VR8200 Continuous Pilot Dual Automatic Valve Combination Gas Controls are used in gas-fired, standing pilot appliances. CONVENIENCE TERMINALS SERVE AS A TIE POINT ONLY. Hunker may earn compensation through affiliate links in this story. 9. 4. 10 Easy Things to Check When Troubleshooting a Furnace Gas Valve. Check the power unit resistance. 0000005748 00000 n 0 Most common. Tighten the screws to 25 inch-pounds of torque to provide a gas-tight seal. 0000072700 00000 n 0000002388 00000 n Draw yourself the circuit. The gas control is likely to have operated for more than 200,000 cycles. 0000023456 00000 n A1/{;_Fe o(*=`. 0000036895 00000 n The pilot must be manually relit when normal burner operation is desired. The screw to adjust the pilot gas is a needle valve. 0000003019 00000 n When the ow pressure regulator is fully open, the high-pressure regulator maintains the desired full-rate outlet pressure as described for the standard regulator.The step model requires approximately 60 seconds to reset once the main burner goes off. Also, this product is tested and calibrated under closely controlled conditions, and some minor differences in performance can be expected if those conditions are changed. If the pilot flame goes out, turn the gas control knob clockwise, If the pilot flame remains lit, turn the gas control knob counterclockwise. Appliances that are used seasonally should be checked before shutdown and again before the next use. 0000015431 00000 n But it has been reliable for a long time. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Refer to Table 7 or 8 for the factory-set nominal outlet pressures and adjustment ranges. Set the thermostat or the device's controller slightly above the current room temperature. ,[Uw-GTk`{LvG*!1li$:,nZeQh.i&. 0000057737 00000 n Do not remove the existing window frame assembly. 14 when the: The power unit holds the safety shutoff valve disc off its seat, so gas can flow into the control. 0000010874 00000 n Your system is quite old and somewhat unsafe, in that the pilot comes off ahead of the safety valve. This increases gas pressure under the automatic valve and repositions the valve disc closer to the seat. Bubbles indicate a gas leak. Adjust the thermostat several degrees higher than your current room temperature. See Fig. 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. There is a heat anticipator coil in there which limits current to the valve, and shorting that out can damage the valve. Order number, SUPER TRADELINE or TRADELINE if desired. For use in standing pilot appliances. 0000001317 00000 n Tis the season. Ensure the O-ring is fitted into the groove of the flange. For the battery test above only connect the battery for a second or two just to see if the gas valve works. This type of gas valve used a single thermocouple. Thanks for that well-descriptive tips. 0000026384 00000 n 0000016504 00000 n JavaScript is disabled. Failure to follow them could damage the product or cause a hazardous condition. Check the transformer. Mount the gas control so gas flow is in the direction of the arrow on the bottom of the gas control. Read these instructions carefully. Do not thread pipe too far. We get it, but (1) terrylove.com can't live without ads, and (2) ad blockers can cause issues with videos and comments. Mount the gas control 0-90 degrees, in any direction, from the upright position of the gas control knob, including vertically. IMPORTANT: These gas controls are shipped with protective seals over inlet and outlet tappings. rev2023.3.3.43278. Remove the regulator cap screw and pressure regulator adjusting screw. Your problem seems to involve large -- really large -- "industrial size" issues. Use new, properly reamed pipe free from chips. If you do not smell gas, turn the knob on gas control counterclockwise. hb``b``r` LT, bBPQ%@AL;LiaP2l3 2 Usually this problem can be resolved by using an adapter. You are using an out of date browser. The gas valve cannot be repaired in the field. If it is, simply replace the igniter/flame rod assembly. cut tubing to the desired length and bend as necessary for routing to pilot burner. Refer to Figs. See Fig. Minimum regulated capacity is 20 feet 3 /hour [0.6 meters 3 /hour]. Outstanding! 54), whichever applies. Refer to the Adjust the Pilot Burner Flame section. Locate gas control in a well-ventilated area. This makes it ideal for fireplace and space heating uses that are vent free. The internal valve coil must then be connected to the topmost and bottommost of the four terminals. If the appliance is a hot water heater but it's not firing up, the thermopile might be weak. 0000036872 00000 n Do not touch any electrical switch or use the phone. When the thermostat calls for eat, the first automatic valve and the second automatic valve operator are energized. Both pilot and main burner are shut off. What is a word for the arcane equivalent of a monastery? 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. Yes, this shows the pilot gen. in series with the limit switch in series with the t'stat. I suspect they are the "white" terminal and TH1. Bulk update symbol size units from mm to map units in rule-based symbology. If the gas control knob or reset button will not operate by hand, or if the reset button stays depressed after it is released, the gas control should be replaced by a qualified service technician. Push and hold down the red reset button (Figs. This is an electrical connection and must be clean and dry. Fig. Check fireplace to make sure it is levelled and properly positioned. Troubleshooting the valve and looking for known common issues will give you peace of mind by ensuring the safe operation of your Honeywell appliance. Tech Guru. 0000018497 00000 n 2. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 0 This behaviour is consistent with what I have seen/heard when the Honeywell valves begin to fail. 0000002167 00000 n By creating an account you agree to the Hunker, How to Light the Pilot Light on a Honeywell VR8200. TABLE 5MAXIMUM LENGTH OF SUPPLEMENTARY LIMIT LEAD WIRES WHEN USING Q340A THERMOCOUPLE. Rear V ented Direct V ent Gas Fireplace Model: PLEASE READ THE INSTALLATION & OPERATING INSTRUCTIONS BEFORE USING THE APPLIANCE. Below are my tests: Outlet pressure to the main burner increases gradually from 0 in. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Open the manual gas switch if the gas valve fails to operate and look to see if gas is flowing to the main burner or pilot. In replacement applications, locate the gas control in the same location as the old gas control. If you smell gas, immediately shut off the manual valve in the gas piping to the appliance or, on LP, at the tank. GAS CONTROL KNOB SETTINGSThe gas control knob has three settings:OFF: Prevents pilot and main burner gas flow.PILOT: Permits pilot gas flow only. Resistance between the THTP & TH terminals must be 11.5 W0.2 W 2. And we already know that the t'stat + terminal is jumpered to the t'couple + terminal, and that the t'stat - terminal is jumpered to the limit switch + terminal. THEY ARE NOT INTERNALLY WIRED TO THE CONTROL CIRCUIT OR TO THE GROUND.

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