In this HVAC Furnace Video, I go over the Operation and Troubleshooting of a 750 Millivolt Gas Valve and Thermopile/PowerPile. I have an old millivolt gas furnace that's stopped working. Flanges available for 3/8, 1/2 and 3/4 inch straight and 90 angle connection. Carefully check the main burner light off at the step pressure. 0 To learn more, see our tips on writing great answers. wc [0.9 kPa] outlet pressure). Use an ac voltmeter to measure the voltage across terminals TH and TR. Usually this problem can be resolved by using an adapter. 0000017038 00000 n I'm looking for help identifying what model it actually is (so I can search for information specific to it) or ideas on what might be wrong. Apply a moderate amount of good quality pipe compound to bushing, leaving two end threads bare. Never use any tools. Fig. 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. Any adjustments to gas control equipment should be checked using combustion efficiency test equipment by trained technicians. Adjustable servo regulator effectively maintains almost constant gas output pressure under wide fluctuation in gas supply pressure. Choose the appropriate flange for your application. If it is flowing, measure the voltage between the 24V Hot and 24V Common leads to the SmartValve. This product was the perfect replacement for the Honeywell thermopile in a circa 1975 gas fireplace unit. 4 41 The diaphragm-operated second automatic valve opens under the control of the regulator and closes if gas or power supply is interrupted. So in short, I get heat both times of the day for say an hour and it just sits idle with the pilot lit. startxref If another gas leak is detected, tighten adapter screws, joints, and pipe connections. There must be two terminals in this connector block that powers the gas valve coil. They include a safety shutoff, a manual valve, two automatic operators, a pressure regulator, a pilot adjustment, and a conduit cover (VR4200 only). Do I need a thermal expansion tank if I already have a pressure tank? The combination of spring pressure under the second automatic valve diaphragm and the lack of outlet pressure holds the diaphragm firmly closed. When the pilot goes out, the thermocouple current drops and the power unit drops out, closing the safety shutoff valve. 0000052145 00000 n The gas control is likely to have operated for more than 200,000 cycles. Most common. A stuck valve could release gas into the air without regulation or the valve could cause the unit not to fire up at all. I am trying to diagnose a problem with an old furnace. 2). If you have not I will give some ideas. 0000011066 00000 n I show you how to Light the Pil. Push and hold down the red reset button (Figs. 0000007638 00000 n Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from any purchases after clicking through. The minimumregulated capacity is 40 feet 3 /hour for propane. Insert bushing in gas control and thread pipe carefully into bushing until tight. Refer to Table 7 or 8 for the factory-set nominal outlet pressures and adjustment ranges. IF THE PILOT BURNER FLAME GOES OUT WHEN THE GAS CONTROL KNOB IS RELEASED, IF THE MAIN BURNER WILL NOT COME ON WITH A CALL FOR HEAT. Standard Opening Pressure Regulation (VR8200A,M, and VR4200A, M)During the ON cycle, the servo pressure regulator provides close control of outlet pressure, even if inlet pressure and flow rate vary widely. This category contains Honeywell SmartValve, Gas Controls, Millivolts, Pressure Regulators, Gas Control Parts and Industrial Gas Valves. . The Thermopile, energized by the pilot flame, generates sufficient power to operate the gas valve and on/off switch. The maximum regulated capacity is 200 feet 3 /hour [5.7 meters 3 /hour]. 0000043015 00000 n 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. Mutually exclusive execution using std::atomic? . ECO connector included with some models: also available as an accessory. The PILOT position allows pilot burner gas flow only. 0000055306 00000 n 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. If the appliance is a hot water heater but it's not firing up, the thermopile might be weak. I go over how it is Wired, wha. Learn more about Stack Overflow the company, and our products. I suspect they are the "white" terminal and TH1. Furnace gas valves cannot be repaired. The screw to adjust the pilot gas is a needle valve. Insert the replacement spring with the tapered end down. The reduced pressure on the bottom of the automatic valve diaphragm repositions the diaphragm downward away from the valve seat, allowing main burner gas flow. The opening is slowed because a gas flow restrictor in the passage from the second automatic operator slows the rate at hich gas pressure is reduced under the second automatic valve diaphragm after the automatic operator opens. Home and Building ControlHoneywell Inc.1985 Douglas Drive NorthGolden Valley, Minnesota 55422, Home and Building ControlHoneywell LimitedHoneywell Limite740 Ellesmere RoadScarborough, OntarioM1P 2V9, This is a legacy product document supported by Resideo. 0000004324 00000 n 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. 0000013062 00000 n See Fig. Millivolt systems have been the industry standard for decades, and are in some ways simpler to troubleshoot than electronic ignition systems. IMPORTANT: These gas controls are shipped with protective seals over inlet and outlet tappings. For the VR4200, make sure the conduit cover is in position and secured to the gas valve with the screw provided. 0000017288 00000 n TABLE 6MAXIMUM LENGTH OF SUPPLEMENTARY LIMIT LEADWIRES WHEN USING Q309A THERMOCOUPLE. 0000003019 00000 n 0000006973 00000 n SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION. This behaviour is consistent with what I have seen/heard when the Honeywell valves begin to fail. Do not remove the existing window frame assembly. When the pilot goes out or becomes too small to sustain normal ignition. The electrical/scientific basis for millivolt systems is the Seebeck Such heavy cycling wears out the gas control in one to two years. %%EOF 0000006740 00000 n Refer to Figs. Thus the flow of gas through the second automatic valve is reduced, and outlet pressure falls to the desired level. Set your voltmeter for the proper voltage that is, above 24 volts. 0000001836 00000 n If you smell gas, immediately shut off the manual valve in the gas piping to the appliance or, on LP, at the tank. Category: HVAC. To adjust the pilot flame: LIGHT MAIN BURNERFollow the appliance manufacturer instructions or set the thermostat setting above room temperature to call for heat. Assure the main gas supply valve is open and the pilot gas supply line is purged of air. Do not secure conduit cover at this time. If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: BODY PATTERN: Straight-through with 1/2 inch inlet and 1/2 inch outlet. 14 when the: The power unit holds the safety shutoff valve disc off its seat, so gas can flow into the control. 0000019920 00000 n And after two or so minutes, the gas chambers will be lit. 0000016980 00000 n 0000057714 00000 n 0000044882 00000 n The gas control should e replaced if: It does not perform properly on checkout or troubleshooting. 0000000016 00000 n Turn off the main gas supply to the appliance. It has been obsolete for over 30 yrs now. 0000002246 00000 n 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. 0000012919 00000 n While taking a Millivolt reading on a safety magnet, disconnect thermocouple & wires from the valve. Maintenance frequency must be determined individually for each application. Check the power supply rating on the valve and make sure it matches the available supply. If the inlet pressure is in the normal range (refer to Table 7 or 8), replace the existing gas control. If it is re-energized within 60 seconds, it may bypass or shorten the length of the low-pressure step. Set your thermostat to under the room's current temperature and let at least one minute pass to allow the appliance to attempt to get fuel. 0000011836 00000 n But it has been reliable for a long time. Dont touch any electrical switch or use the phone. Check if gas is flowing if you turn on the gas and the pilot burner doesn't light. If a gas leak is detected, tighten the pipe connection. 0000002388 00000 n 0000010110 00000 n VR8200J has a six-second delay from when the thermostat calls for heat until the main gas valve opens. 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. You are using an out of date browser. Seems my new millvolt gas valve turns off PILOT and MAIN BURNERS. Advertisement Never use pipe compound. This valve is only for vent free applications. The internal valve coil must then be connected to the topmost and bottommost of the four terminals. Failure to do so may result in fire or explosion. Remove seals over gas control inlet and outlet if necessary. Is it possible to rotate a window 90 degrees if it has the same length and width? Use only glass approved by Vermont Castings, Majestic Products on this fireplace. Readings outside this range indicate the gas valve is defective and must be replaced. When making the conversion, the main pilot burner orifices must be changed to meet the appliance manufacturer specifications. 0000023590 00000 n Identify/troubleshoot this millivolt furnace valve, We've added a "Necessary cookies only" option to the cookie consent popup. The main burner gas flow is blocked by both automatic valves. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The generator, heated by the pilot burner flame, pro- . CONVENIENCE TERMINALS SERVE AS A TIE POINT ONLY. 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. 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. Do not try to light any appliance. The burner may relight at the full flow rate. These controls combine a manual gas cock, automatic pilot safety valve and a millivolt operator. 0000009803 00000 n This may burn out the heat anticipator in the thermostat. SPECIFICATIONS Main Gas Connection: Valve: 3/8 in. Locate the hot surface igniter and look for a spark or glow there. Gas valves exposed to high ammonia conditions, i.e., those used in greenhouses or animal barns may fail in one or two years. 0000011088 00000 n 2 or 3) clockwise. (supposedly so they could fix them :yes: ), Cool. This diverts gas flow from the automatic valve diaphragm and causes a reduction of pressure on the underside of this diaphragm. See Table 3. an Elbow (angle) flange cannot provide a right-hand inlet when the ECO connector is used.NOTE: Flange Kits include one flange with attached O-ring and four mounting screws. Refer to the Adjust the Pilot Burner Flame section. If so, how close was it? 0000026384 00000 n Follow these warnings exactly: CAUTIONNever apply a jumper across or short the valve coil terminals. 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. Contact your Honeywell sales representative to request a gas valve with corrosion-resistant construction. The gas control knob is hard to turn or push down, or it fails to pop back up when released. If the reset button does not pop up when released, stop immediately and call your service technician or gas supplier. Yes, there is one screw to adjust the gas to the pilot and another to adjust the gas to the main burner. 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. Thread pipe into gas control. CHOOSE GAS CONTROL LOCATIONDo not locate the gas control where it may be affected by steam cleaning, high humidity, dripping water, corrosive chemicals, dust or grease accumulation, or excessive heat. (50/60 Hz models available on request. As for the gas valve it is probably a "general controls" valve but any 800 millivolt gas valve can be used as a replacement. Filter. Before lighting, smell all around the appliance area for gas. 6. Safety shutoff or pilot gas proves complete shutdown since the safety shutoff valve permits main burner and pilot gas flow. 10Installing thermocouple to the power unit. THEY ARE NOT INTERNALLY WIRED TO THE CONTROL CIRCUIT OR TO THE GROUND. As for the gas valve it is probably a "general controls" valve but any 800 millivolt gas valve can be used as a replacement. PRESSURE TAPPING: Inlet and outlet pressure taps accessible from the top of gas control. Install ThermocoupleThe Q340A Thermocouple (with adapters) is provided with SUPER TRADELINE models of the VR8200A. 0000010088 00000 n 0000002263 00000 n If desired outlet pressure or flow rate cannot be achieved by adjusting the gas control, check the inlet pressure using a manometer at the inlet pressure tap or upstream of the gas control. Good info, thanks! The minimum regulated capacity is 20 feet 3 /hour [0.6 meters 3 /hour]. . Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Rear V ented Direct V ent Gas Fireplace Model: PLEASE READ THE INSTALLATION & OPERATING INSTRUCTIONS BEFORE USING THE APPLIANCE. TABLE 8PRESSURE REGULATOR SPECIFICATION PRESSURES IN kPa. I searched for that gas valve, and found this one as the replacement: I would seriously consider what Jimbo said, but, yes, if you bypass the t'stat and the limit switch with jumper wires and the pilot is on, the valve should open if the schematic is what I think it is. Push tubing into the pilot gas tapping on the outlet end of the control until it bottoms. Ever notice how civil DIY'ers are, generally? Install Piping to Gas ControlAll piping must comply with local codes and ordinances or with the National Fuel Gas Code (ANSI Z223.1 NFPA No. 0000012806 00000 n 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. The pilot light is auto so when the thermostat calls for heat, a spark is sent to the ignition lighting up the pilot. wc [0 kPa] to rated output pressure within 3-6 seconds (for an 80,000 Btuh furnace at 7 in. Do NOT use Teflon tape. Capacity is based on 1000 Btu/feet 3, 0.64 specific gravity natural gas at 1-inch water column pressure drop [37.3 MJ/meters 3, 0.64 specific gravity natural gas at 0.25 kPa pressure drop].The maximum regulated capacity is 200 feet 3 /hour [5.7 meters 3 /hour]. The first automatic valve opens, and the second automatic valve operator valve disc is lifted off its seal. thatguy, I hear you. Turn the pressure regulator adjustment screw clockwise. Only the gas valve manufacturer or someone certified by the manufacturer of the gas valve can make repairs. In many such applications, particularly commercial cooking, the equipment operates 100,000-200,000 cycles per year. If outlet pressure begins to fall, the pressure regulator diaphragm moves slightly lower allowing ore to flow to the gas control outlet. If the pilot flame is engulfing the thermopile and you are not getting enough voltage to open the main gas valve then the thermopile may need to be replaced.Supervision is needed by a licensed HVAC Tech while doing this as Experience and Apprenticeship garners Wisdom and Safety.We've Partnered with TruTechTools.com! 0000004302 00000 n Note that using an adapter increases the overall length of the gas control. DO NOT JUMPER THESE TERMINALS. The Robertshaw - Uni-Line 700-500 and 710-500 Series millivolt gas valves are thermostatically actuated com- bination gas valves. So, to diagnose a gas valve, first check to see if the pilot light is on. 0000004421 00000 n If the inlet pressure is in the normal range (refer to Table 7 or 8), replace the gas control. This material is proprietary to Honeywell Limited and shall not be reproduced, copied or used in any manner without prior written consent of . It may not display this or other websites correctly. Check fireplace to make sure it is levelled and properly positioned. 1. 0000004689 00000 n Resistance between THTP & TP must be 10.0 W 0.2 W JavaScript is disabled. The small valve seat attached to the reset button closes and shuts off the pilot gas flow. cut tubing to the desired length and bend as necessary for routing to pilot burner. Take care when handling the refractory panels as they are fragile until held in place and supported. 0000072700 00000 n Therefore, this unit may not exactly match the listed specifications. Hunker may earn compensation through affiliate links in this story. Replace the part if the gas leak cannot be stopped. Does that indicate more a gas valve problem or a thermopile generator/pilot flame problem? 0000031335 00000 n This shuts off the pilot and main burner gas flow. 0 0000039900 00000 n The pilot works fine but the main burner does not come on by the wall mounted thermostat or the manual on/off switch. Your problem seems to involve large -- really large -- "industrial size" issues. The VR8200 Continuous Pilot Dual Automatic Valve Combination Gas Controls are used in gas-fired, standing pilot appliances. The Fora platform includes forum software by XenForo. 0000049205 00000 n See Figs. 0000016504 00000 n %%EOF TRADELINE kits include a 9/64 in. A1/{;_Fe o(*=`. The best answers are voted up and rise to the top, Not the answer you're looking for? Models for natural or LPgas.ADDITIONAL FEATURES: STANDARD MODELSMODEL: VR8200 and VR4200 Continuous Pilot Dual Automatic Valve Combination Gas Controls. I recommend you call a heating expert. Do not remove seals until ready to connect piping.Follow the appliance manufacturer instructions if available; otherwise, use the instructions provided below. 244 0 obj << /Linearized 1 /O 247 /H [ 2388 392 ] /L 541180 /E 139793 /N 4 /T 536181 >> endobj xref 244 91 0000000016 00000 n At least having yours done professionally would appear to put you in a position of a tax deduction for repairing it. 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. Read these instructions carefully. Do not bend tubing at gas control or pilot burner after compression fitting has been tightened, as this may result in a gas leakage at the connection. Turn the gas control knob (Figs. Apply a moderate amount of good quality pipe compound (Do not use Teflon tape) to pipe only, leaving two end threads bare. OD tubing. WARNING!FIRE OR EXPLOSION HAZARDS CAN CAUSE PROPERTY DAMAGE, SEVERE INJURY, OR DEATH. Remove the thermopile wiring connector from the gas control. 0000008848 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. Check the regulator setting either with a manometer or by clocking the gas meter. 0000016105 00000 n If your gas supplier cannot be reached, call the fire department. 0000011045 00000 n pressure drop for straight-through configuration). Natural to LP gas conversion kit available for nonTRADELINE standard and slow-opening models. 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. Install control and appliance according to appliance manufacturer instructions. ADJUST THE PILOT BURNER FLAMEThe pilot flame should envelop 3/8 to 1/2 in. 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. IMPORTANT: The specifications given in this publication do not include normal manufacturing tolerances. 0000003696 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. Do not bend pilot tubing at gas control or pilot burner after compression fitting has been tightened, or gas leakage at the connection may result. 0000052168 00000 n endstream endobj 11 0 obj <> endobj 12 0 obj <> endobj 13 0 obj <>stream Adjust the thermostat several degrees higher than your current room temperature. 0000062506 00000 n If outlet pressure begins to rise, the pressure regulator the diaphragm moves slightly higher, allowing less gas flow to the gas control outlet. 0000028651 00000 n Do not force the gas control knob. Troubleshooting the valve and looking for known common issues will give you peace of mind by ensuring the safe operation of your Honeywell appliance. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Several troubleshooting methods applied to and including bypassing the thermostat but failed to yield any results. Always replace the cover screw after adjustment and tighten firmly to assure proper operation. 15. Appliances that are used seasonally should be checked before shutdown and again before the next use. If the voltage is dead or not as rated, replace the valve. Do not exceed the input rating stamped on the appliance nameplate or manufacturer-recommended burner orifice pressure for the size orifice(s) used. Asking for help, clarification, or responding to other answers. A place where magic is studied and practiced? Ensure the installer is a trained, experienced service technician. SIT 822 Valve with a Honeywell Electronic Igniter NOTE: Remove glass before servicing. If tubing is used, obtain a tube-to-pipe coupling to connect the tubing to the gas control. If it is, simply replace the igniter/flame rod assembly. Read the safety information in the WARNING.This appliance has a pilot burner, which must be lit by hand. Cover gas control if the appliance is cleaned with water, steam, or chemicals to avoid dust and grease accumulation. Unscrew compression fitting from the pilot outlet (Fig. 0000001377 00000 n A stuck valve could release gas into the air without regulation or the valve could cause the unit not to fire up at all. This is How to Wire the Thermopile to The 750mv Gas Valve for the Pilot and Main Gas Burners.

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