Company Model Description RelYear ABB ACH 501 Adj Frequ AC Drives Installation Start Up Manual 1996 ABMANUFACTURING Table Top Mask Alignment Users Manual.Flue Gas Spillage Switches on Gas or Oil Fired Equipment Spill switch choices, installation, inspection, repair.SPILL SWITCH, FLUE GAS DETECTOR CONTENTS Flue Gas.Comments for How To Read York Hvac Model And Serial Number.Average Rating. Click here to add your own comments.S7p10ScG_EjSOuPgfSRV5sln0ahz9SNCiysikqkkRv8tCZVJRsOPomyhnZHwpEivyr8P-Q=w1200-h630-p' alt='Guardian Furnace Installation Manual' title='Guardian Furnace Installation Manual' />Flue Gas Spill Switches Guide to Furnace or Boiler Flue Gas Spill Switches on gas fired boilers, furnaces, water heaters.SPILL SWITCH, FLUE GAS DETECTOR CONTENTS Flue Gas Spill Switches Guide to Furnace or Boiler Flue Gas Spill Switches on gas fired boilers, furnaces, water heaters Purpose, Inspection, Repair Troubleshooting Guide.Guide to Using Flue Gas Spill Switches for detecting carbon monoxide leaks at gas fired equipment.Troubleshooting heating system hot water heater equipment safety controls.POST a QUESTION or READ FAQs about gas fired heating equipment spill switches diagnosis, repair, replacement, function, safety features.REFERENCESInspect.APedia tolerates no conflicts of interest.We have no relationship with advertisers, products, or services discussed at this website.Guide to flue gas spill switches on gas or oil fired heating equipment What is a flue gas spill switch or gas spillage detector How do flue gas or draft hood spill switches work Where should spill switches be installedHow are spill switches tested What causes nuisance or legitimate flue gas spill switches to trip How do we correct un wanted loss of heat due to flue gas spill detector switch operation or nuisance tripping Here we explain the installation, function, troubleshooting Flue Gas Spill Switches and we provide a Guide to inspecting Furnace or Boiler Flue Gas Spill Switches on gas fired equipment such as heating boilers, warm air furnaces, water heaters. C C Red Alert 3 Bonus Content . We describe the Purpose, Inspection, Repair Troubleshooting Guide for flue gas spill switches which are installed at dampers or burners on gas fired equipment.Green links show where you are.Copyright 2. 01. 7 Inspect.Apedia. com, All Rights Reserved.Guide to Furnace or Boiler Flue Gas Spill Switches on gas fired equipment Purpose, Inspection, RepairClick to enlarge any imageArticle Contents What is a furnace, boiler, or water heater flue gas spill switch This article discusses flue gas spillage detectors used on gas or oil fired heating equipment found in buildings.Spillage detector switches monitor temperature or actual gas content of flue gases that might spill from the vent or draft hood or burner area of a gas fired heating appliance.When unsafe spillage occurs the switch operates to turn off the heating appliance using one of several methods.Most flue gas spillage or thermal safety switches must be re set manually though a few models include an automatic reset feature.Synonyms for flue gas spill switch include thermal sensor switch, thermal safety switch, and blocked vent safety switch.Since escaping combustion gases in a building are dangerous forming a potentially fatal carbon monoxide hazard.Some flue gas spillage detectors operate to close the gas supply to the heating appliance.A spill switch may be found at the draft hood on any modern gas fired appliance, such as a heating furnace hot air heat.Similar gas detection or safety device are also used on gas log fireplaces and on coal fired heating systems as well as in industrial applications.Some flue gas spill detectors actively detect flue gases or carbon monoxide but the simplest models respond to temperature by detecting the hot gases associated with flue gases on gas fired heating equipment.This little flue gas spillage sensor sensor, or two or more of them, form.What causes unsafe flue gas spillage Heater startup spillage Initial combustion of a gas fired appliance can cause brief flue gas spillage at the draft hood because the appliance as well as the flue and chimney may need time to warm up and start a good draft in a cold chimney into which it is venting.This is normal and the spillage should stop in less than three minutes as the flue and chimney are warmed.Flue gas spill sensor switches are designed to avoid false tripping due to this condition.If flue gas spillage continues after the initial burp of combustion products we just described, then the system is unsafe.Improper chimney installation such as venting a small BTUH appliance a water heater into a large masonry flue.Especially in cold weather the appliance may never develop adequate draft.We see this occurring when a building converts a heating boiler or furnace to a direct vent system, no longer venting into the chimney, but where the water heater is left trying to vent into the old chimney flue.In fact any defect that causes inadequate draft can cause detectable flue gas spillage.Chimney leaks, an improper or missing chimney cap, chimney blockage, or similar problems may be the underlying cause of heating system shut down by the flue gas spillage detector.See CHIMNEY INSPECTION CHECKLISTInadequate combustion air supply to the heating appliance located in a room too small with no outside air supply located in a too small utility room with a solid door that when closed, blocks air.If your building has this problemsee COMBUSTION AIR DEFECTSBuilding depressurization turning on fans in the building depressurizes the utility room or area around the heating appliance, overcoming the natural draft in the appliances chimney, causing back drafting.See BACKDRAFTING HEATING EQUIPMENT This condition might also occur also with power vented equipment in some conditions.See VENTILATION, BALANCED for building ventilation approaches that avoid dangerous building depressurization,and.See COMBUSTION AIR for TIGHT BUILDINGS for immediate solutions to inadequate combustion air caused by tight or depressurized buildings.Other reasons for flue gas spillage Other reasons that a gas flame may be lost or a gas fired appliance shut off on safety may have nothing to do with bad flame or bad combustion air.For example a common part failure on gas fired heating equipment is the thermocouple that senses the pilot flame.If we cant keep a flame lit we suspect the thermocouple first.CONTACT US with suggestions.Bachrach Corporation, a manufacturer of heating system test equipment opines that gas fired equipment is more likely to have flue gas spillage from a blocked chimney than from building depressurization due to inadequate combustion air supply.Were not sure what data supports that view but more details are at REFERENCES where the effects on flue gas spillage due to building depressurization are discussed.One author warns that even where CO was not detected in some building depressurization studies other harmful flue gases such as NOX may be present.Certainly home inspectors find many heating appliances installed in tiny closets with no outside combustion air and a door that, when shut, blocks off air to the appliance.We have also observed that gas fired heating equipment operated just fine in a building until a new owner installed a whole house ventilation fan system.Where are combustion gas spillage switches installed Combustion gas or flue gas spill switches are usually installed at the edge of the gas fired appliance draft hood.Some appliances may also have a spill switch installed at the gas burner opening itself.This photo shows a spill switch.In the somewhat blurry photo of dog hair blocking a heater draft hood above.In the photo at left, a spill switch was not installed but had been simply left loose, disconnected, atop the water heater.Watch out as we explain in more detail just below at FLUE GAS SPILL DETECTOR MALFUNCTIONS, an improperly installed or improperly located spillage switch detector can cause either nuisance tripping spill switch shuts off heat when it should not or unsafe operation spill switch fails to detect dangerous flue gas spillage.Watch out also to be sure to select the proper spillage switch for the type of heater you are protecting.For example, Tjernlunds spillage switch instructions include additional details for spillage switch use on water heaters and on furnaces and boilers, from which we excerpt Gas fired water heaters Millivolt water heaters require the Tjernlund Model JA 1 PN 9.Thermocouple. Junction Adapter ordered separately.Connect ends of six foot cable to spade connections on.Thermocouple Adapter.Gas fired boilers furnaces Splice ends of six foot cable in a series circuit between the thermostat and gas valve or burnercontrol.Using cable routing tabs from wire routing packet, attach 6 cable to appliance maintaining asafe distance from hot surfaces, e.Tjernlunds, retrieved 1.FLUE GAS SPILL SWITCH SOURCES SELECTION below.
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