Lennox G8 Furnace Manual

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Lennox G8 Furnace Manual

Lennox G8 Furnace Manual
Lennox G8 Furnace Manual Gas Valve
Lennox G8 Furnace Manual Wiring
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Lennox G8 Furnace Manual
Lennox G8 Furnace Manual Gas Valve
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Heat exchanger can crack for various reasons and should be checked every time furnace is repaired or maintained.

Here is an old 1977 Lennox natural gas furnace tour. It is model # G8D2-82-3I made a video previously just on the startup, this one is more comprehensive.
Visually check heat exchanger for cracks
You will find most cracks form near the back and where the heat exchanger metal bends, Since this is where it will be weakest due manufacturer weakening the metal by bending it.
Watch the flames as the furnace fan starts if you see the flames are blowing around or out the front of the burners then you will need to take a closer look at the heat exchanger

Water test
This test worked best on the old Lennox G8 and would find cracks or pinholes on the heat exchanger that sometime could not be seen.
If there is no air conditioning then it will be easy to access above the heat exchanger through the humidifier. Once the heat exchanger cools down spray water on the heat exchanger from the top insuring full coverage and being careful of the electronics and motors. Then watch inside the burners for water to seep through, A good heat exchanger will not let moisture into burner chamber
Using carbon monoxide detector
Test for carbon monoxide at return air as well at supply air and compare the two readings or test at supply air with burners on then off making sure furnace is not back drafting and compare.
If you take reading once and only at supply air you will not be 100 percent sure the problem is with the heat exchanger. You are testing the accumulation of carbon monoxide over a long period of time from other sources like the furnace or hot water tank back drafting also it could be from outside sources like a vehicles near the intake air.
Reasons for cracks
If the furnace does not have enough combustion air it will cause the furnace to run hotter then designed. Then with more expansion and contraction in the heat exchanger it causes cracks. The gas pressure must be set as per furnace name plate derated for location altitude if too much gas heat exchanger will run too hot.Blower speeds must be checked by comparing furnace temperature difference to name plate rating if running too hot increase fan speed and recheck temperature supply air minus return air.
.
Any crack in a heat exchanger is dangerous and the heat exchanger must be replaced when crack is found
Thank you for visiting my blog I would appreciate any feedback I can get, Please leave a comment on whether my information has helped you. I am always interested in more topic to write so feel free to leave a comment asking about anything related to HVAC-R (Heating, Ventilation, air conditioning, refrigeration).
Thanks for reading my blog
Tagged: carbon monoxide, cracked heat exchanger, heat exchanger
POST a QUESTION or COMMENT about where to find furnace or boiler installation and service or maintenance manuals and guides
InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Lennox Manuals, parts lists, wiring diagrams for HVAC equipment:
Free downloadable manuals for Air Conditioners, Boilers, Furnaces, Heat Pumps. Here we provide free downloadable copies of installation and service manuals for heating, heat pump, and air conditioning equipment, or contact information for the manufacturers who can provide that information for nearly all major brands of HVAC equipment. 
We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. 
Lennox Furnaces, Heat Pumps, Air Conditioners - Contact Information, Manuals, Data Tag Decoding - contact information Free Lennox Furnace, Heat Pump, Air Conditioner Installation & Service Manuals, Wiring Diagrams, Parts ListsLectra system modaris v8. Below we provide HVAC manufacturer contact information and direct links to free downloadable installation, service, and users manuals, focusing on hard-to-find manuals for older models or discontinued equipment. We also provide links to the manufacturer's current model lists and literature.
See LENNOX HVAC MANUALS & PARTS GUIDES Industries Air Conditioners, Furnaces, Heat Pumps , Manuals, Guides
To find a Lennox Dealer near you go to http://www.lennox.com/residential/ and enter your zip code in the box at the web page upper right corner,ORuse the links to Lennox at the left side of this web page (supplied by Google).
Contact information for Lennox industries, in Dallas Texas:
Lennox Corporation - 1-800-9-LENNOX (1-800-953-6669)
2100 Lake Park Blvd.
Richardson, TX 75080
P.O. Box 799900
Dallas, TX 75379-9900
 NAIC: 333415 Air Conditioning & Warm Air Heating Equipment & Commercial & Industrial Refrigeration Equipment Manufacturing; 333414 Heating Equipment Manufacturing, Except Warm Air Furnaces; 333994 Industrial Process Furnace & Oven Manufacturing; 336322 Other Motor Vehicle Electrical & Electronic Equipment Manufacturing; 42173 Warm Air Heating & Air Conditioning Equipment & Supplies Wholesalers
Also see Lennox data tag decoding information under the letter L
 at DATA TAGS on AIR CONDITIONERS
LINKS to OLDER, hard-to-find Lennox HVAC equipment manuals are provided at this website - LENNOX MANUALS & GUIDES - HVAC just below.
The Lennox Pulse furnace safety inspection is (or was) free, but if the furnace has to be cleaned in order to be inspected, the customer could be charged for the cleaning.
See Lennox PULSE FURNACE SAFETY WARNING .
At Technical Reviewers & References we provide more contact information, links to current model list information, product specifications, and installation/operation manuals
Lennox: free, downloadable Lennox Pulse Furnace User's Manuals and Service Manuals are listed just below:Lennox G8 Furnace ManualSafety: owners of older model Lennox Pulse Furnace heating equipment should also see Lennox PULSE FURNACE SAFETY WARNING - Lennox Pulse Furnace Safety Inspection/Warranty Program: Carbon Monoxide Warning
 That document describes carbon monoxide gas (CO) leak safety hazards on certain models of Lennox hot air heating furnaces and announces an inspection and recall/repair program for these systems.
Lennox PULSE FURNACE SAFETY FAQs - web page
Lennox PULSE FURNACE SAFETY WARNING - web page
 See also HEAT EXCHANGER LEAKS for more information about heat exchanger leaks and furnace safety
 and
 See also CARBON MONOXIDE GAS TOXICITYfor information about carbon monoxide.

Also see ARMSTRONG Air: Armstrong oil furnaces, Armstrong gas furnaces, Armsrtong heat pumps, packaged units & air handlers or coils
Lennox AIR COOLED CHILLERS IO MANUAL [PDF] retrieved 2019/01/07 original source http://webmanuals.lennoxeurope.com/Current%20Products/Chillers/Water_cooled_chillers/MCW/Installation%20and%20op.%20manual%20%20(IOM)/CHILLER_AC-IOM-0105-E.pdf
LENNOX CBX AIR HANDLER INSTALLATION MANUAL [PDF], Model: Dave Lennox Signature Collection CBX32MV Unit multi-Position Air Handlers (2011) retrieved 2018/07/31, original source: https://www.lennox.com/lib/legacy-res/pdfs/installation_maintenance/lennox_cbx32mv_iom.pdf
 Excerpt:
This indoor unit is designed for installation with optional field−installed electric heat and a matched remote outdoor unit that is charged with HFC−410A refrigerant. These units, designed for indoor installation in multiple positions, are completely assembled for upflow and horizontal right−hand discharge before being shipped from the factory. 
All CBX32MV air handlers are equipped with a factory−installed, internally mounted check / expansion valve (CTXV), which is suitable for use in HFC−410A applications. 
This air handler is compatible with the ComfortSense® 7000 non−communicating thermostat and non−communicating outdoor units. In addition, this unit has the enhance capability of communicating with the icomfort Touch® thermostat and compatible outdoor units using the Lennox RSBus protocols.
LENNOX CB31MV AIR HANDLER INSTALLATION MANUAL [PDF] (2008)
LENNOX G12 / G12E SERIES FURNACE INSTALLATION MANUAL [PDF] using one of 3 types of fan limit controls: Camstat, Cemco, or Honeywell.
 See also HONEYWELL FAN LIMIT SWITCH WIRING and see also WIRING GUIDES for CAMSTAT, CEMCO, FIRESTAT FAN LIMIT CONTROLS
Lennox G14 Pulse Gas Furnace User's Manual from 1990 #502.596M that supercedes Lennox 502.207M
Lennox GSR14 Pulse Gas Furnace User's Manual from 1990, Lennox# 502.595M that supercedes Lennox 502.206M
Lennox G21Q and G21V Lennox Pulse Gas Furnace User's Manual from 1996, Lennox #503.072M that supercedes the 1996 edition. Lennox Industries, Dallas TX
Lennox GSR21Q and GSR21V Lennox Pulse Gas Furnace User's Manuals from 1998, supercedes the 1996 manuals, Lennox # 503.073M
Lennox GSR21Q Lennox Pulse Furnace Manual from 1991, Lennox # 502.694M 8/91
LENNOX G12 / G12E SERIES FURNACE INSTALLATION MANUAL [PDF] using one of 3 types of fan limit controls: Camstat, Cemco, or Honeywell.
Lennox G12, G12R & G12X Series GAS FURNACE MANUAL [PDF] (8/1990) 
Lennox G12-G12E FURNACE MANUAL [PDF] (10/1987) Gas Furnaces
Lennox G24-200 Series Upflow Gas Furnace Manual, Lennox # 503.614M,1998
Lennox G26 Series Gas Furnace Manual, 1998, #503.533M
Lennox G32V Series Gas Furnace Manual, 2001, #504.391M
Lennox G32Q/V Series Gas Furnace Manual, 2001, #504.392M
Lennox G40DF (X) Series Gas Furnace User's Information Manual, 2001, #504.322M
Lennox G50DF(X) Series Gas Furnace User's Information Manual, 2001, #504.324M
Lennox G60 DF(X) Series Gas Furnace INSTALLATION INSTRUCTIONS [PDF] (05/2009)
Lennox G60DFV(X) Gas Furnace Manual, 2002, #504.577M
Lennox G61MP Series Gas Furnace Manual, 2003, #504.741M
Lennox G81 Gas Furnace Manual [PDF] 6 pages
Lennox RFC AIR CONDITIONING SYTSEM COOLING UNITS [PDF] (1965)
Lennox ROOFTOP UNIT IOM MANUAL BALTIC SERIES [PDF] Valid only for rooftop AC units displaying one of these codes: : GB IR GR DA NO FI IS BCK 02
 - BCK 025- BCK 030- BCK 035- BCK 040- BCK 045- BCK 050BHK 020 - BHK 025- BHK 030- BHK 035- BHK 040- BHK 045- BHK 050BGK 020 - BGK 025- BGK 030- BGK 035- BGK 040- BGK 045- BGK 050BDK 020 - BDK 025- BDK 030- BDK 035- BDK 040- BDK 045-BDK 050 IOM-RT B/0803-E
retrieved 2019/01/07 original source https://www.c-o-k.ru/library/instructions/lennox/kondicionery-promyshlennye/8628/25428.pdf
Lennox 78UGF Series Gas Furnaces, User's Information Manual, 1993, supercedes the 1992 edition, Lennox # 502.840M
Lennox 78RGF Series Gas Furnaces, User's Information Manual, 1993, supercedes 1992, #502.842M
Lennox 90UGF Series Gas Furnace User's Information Manual, 1997, Lennox # 503.629M
Other Lennox owners manuals for air conditioners, air handlers, furnaces, heat pumps, indoor air quality systems, packaged units, water heaters, zone controls and other controls such as thermostats, are provided by Lennox at http://www.lennox.com/support/manuals.asp
Lennox Corporation, 'ELITE® Series R-410A AIR CONDITIONERS INSTALLATION & OPERATION MANUAL' [PDF] (2017), retrieved 2017/07/09,original source: https://www.lennoxpros.com/docs/Technical/210758.pdf
Lennox Corporation, 'INSTALLATION INSTRUCTIONS, Elite® Series XC13 Units, Condensing Units 506635-01' [PDF] (09/2011), extensive 126 page manual, retrieved 12/2/2014, original source: https://www.lennox.com/pdfs/installation_maintenance /Lennox_XC13_IOM.pdf
LENNOX PULSE FURNACES 2 IDI's and 2 Complaints [PDF] (US CPSC), 5 June 1998, includes CPSC records obtained by a law firm under the FOIA Freedom of Information Act. This information includes description of gas odors, detection of gas leaks, and potential safety hazards that could be helpful to other consumers and service technicians.
FORCED HOT AIR FURNACES: Troubleshooting and Repair, Roger Civi, ISBN-13: 978-0071341714, available at the InspectAPedia bookstore (Amazon.com) new and used. (We recommend a number of heating system inspection, diagnosis, and repair books at this Amazon page).
Lennox Signature® Collection CBX40UHV AIR HANDLER UNIT MANUAL [PDF] (2016) Lennox Industries, Dallas TX USA retrieved 2019/11/13, original source: https://resources.lennox.com/fileuploads/a1cfea55-845e-427e-ab0d-57bbcfecd3e5Lennox_CBX40UHV_IOM.pdf
LENNOX Dave Lennox Signature Collection XC15 UNIT INSTALLATION INSTRUCTIONS [PDF] (2008), Lennox Industries, Inc.
Lennox SL-280 SERIES FURNACE MANUAL [PDF] (2017) Users Innformation Manual for the SL280UHNV Series induced draft gas furnaces.
LENNOX XC15 SERIES SPLIT SYSTEM CONDENSER UNIT SERVICE MANUAL [PDF], (2006) Lennox Industries Inc.
 Description: The XC15 is a high efficiency residential split−system condensing unit, which features a scroll compressor and R−410A refrigerant. Units are available in 2, 2−1/2, 3, 3−1/2, 4 and 5 ton sizes. The series is designed for use with an expansion valve only (approved for use with R−410A) in the indoor unit. 
This manual is divided into sections which discuss the major components, refrigerant system, charging procedure, maintenance and operation sequence. Information contained in this manual is intended for use by qualified service technicians only. All specifications are subject to change.
LENNOX XC15 SERIES SPLIT SYSTEM CONDENSER UNIT WIRING DIAGRAM [image file]
LENNOX XC21 INSTALLATION INSTRUCTIONS (outdoor unit) [PDF] Dave Lennox Signature Collection XX21 system (2012)
Lennox Corporation - Current Use and Care Manuals - Installation & Service manuals for current Lennox equipment: air conditioners, air handlers, furnaces, heat pumps, indoor air quality, packaged units, water heating units, zoning products, and equipment controls. Current Lennox documents are at this link: http://www.lennox.com/support/manuals.asp and include this equipment:
 Air Conditioners - - * HS21 Series * HS25 Series * HS26 Series * HS27 Series * HS29 Series * HSXA12 Series * HSXA15 Series - - Air Handlers - - * CB29M/CB30M Series * CB31MV Series * CBX32V/CBX32 Series * CBX32MV/CBX32M Series - - Furnaces - - * 90UGF Series * G24-200 Series * G24M Series * G24M 50Hz Series * G26 Series * G32 Series * G32V Series * G40DF Series * G40UH Series * G43 Series * G50DF Series * G50UH Series * G50i Series * G51 Series * G60DF(X) Series * G60DFV(X) Series * G60UH Series * G60UHV Series * G61 Series * G61V Series * GHR26 Series * GHR32Q & GHR32V Series * HS29 Series - - Heat Pumps - - * HP25 Series * HP29 Series * HPXA12 Series * HPXA15 Series - - Indoor Air Quality - - * PureAir Air Purification System * WB2 & WP2 Humidifier * Healthy Climate Products * PMAC * Germicidal Lights - - Packaged Units - - * 10GCS & 12GCS Series * GCS16, 20 & 20R Series * GCS29 Series * 13GCSX Series * 15GCSX Series - - Water Heating Units - - * CompleteHeat (HM30) * CompleteHeat (HM30) LP * Aqua Plus (RWH21/CB30MWH) - - Zoning Products - - * Harmony Series * Harmony II® Series * Harmony III® Series - - Controls - - * ComfortSense 7000 Series Touchscreen Thermostat * ComfortSense 5000 Series Touchscreen Thermostat * ComfortSense 3000 Series Programmable Thermostat * ComfortSense 3000 Series Non-Programmable Thermostat * SignatureStat * Elite Touchscreen * Merit Programmable Thermostats * Merit Non-Programmable Thermostats * LZP-2 * LZP-4 -
Lennox Corporation - Archived Lennox Documents at this link: http://www.lennox.com/support/archived-docs.asp contains links to service and installation manuals for older equipment no longer sold by the company, and includes: (Most of these are downloadable free here)
Lennox Installation and Operation Instructions - - Air Conditioners * 10 ACB Installation and Operation Instructions Manual * 10 ACC Installation and Operation Instructions Manual * 12 ACB Installation and Operation Instructions Manual * 13 ACC Installation and Operation Instructions Manual * HS14 Installation and Operation Instructions Manual * HS18 Installation and Operation Instructions Manual * HS19 Installation and Operation Instructions Manual * HS20 Installation and Operation Instructions Manual - - Heat Pumps * 10 HPB Installation and Operation Instructions Manual * 12 HPB Installation and Operation Instructions Manual * HP14 Installation and Operation Instructions Manual * HP16 Installation and Operation Instructions Manual * HP18 Installation and Operation Instructions Manual * HP19 Installation and Operation Instructions Manual * HP20 Installation and Operation Instructions Manual * HP22 Installation and Operation Instructions Manual * HP23 Installation and Operation Instructions Manual * HP24 Installation and Operation Instructions Manual * HPXA19 Installation and Operation Instructions Manual - - Homeowner's Manuals - - Furnaces * 78RGF Series Homeowner's Manual * 78UGF Series Homeowner's Manual * 80UHG Series Homeowner's Manual * Efficiency Plus Series Homeowner's Manual * F8AUH Series Homeowner's Manual * G12 Series Homeowner's Manual * G14 Series Homeowner's Manual * G16(R) Series Homeowner's Manual * G17 Series Homeowner's Manual * G17RSeries Homeowner's Manual * G20 Series Homeowner's Manual * G20R Series Homeowner's Manual * G21Q & G21V Series Homeowner's Manual * G23 Series Homeowner's Manual * G25MV Series Homeowner's Manual * G27M Series Homeowner's Manual * G41UF Series Homeowner's Manual * GH19 Series Homeowner's Manual * GSR14 Series Homeowner's Manual * GSR21Q & GSR21V Series Homeowner's Manual - - Air Conditioners * HS32 Series Owner's Manual * HSXA19 Series Owner's Manual - - Heat Pumps * HP21 Series Owner's Manual * HP26 Series Owner's Manual * HP27 Series Owner's Manual * HP32 Series Owner's Manual
Also see MAGIC PAK HVAC Packaged heating & cooling systems
On 2016-06-08 by trevor - age of my Lennox
whats the age of my lennox g8-110t-1a..

Continue reading at MANUALS for HEATING SYSTEM CONTROLS or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.
Or see these
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Suggested citation for this web pageLENNOX HVAC MANUALS & PARTS GUIDES at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.
INDEX to RELATED ARTICLES: ARTICLE INDEX to AIR CONDITIONING & HEAT PUMPSOr use the SEARCH BOX found below to Ask a Question or Search InspectApedia
Or see
INDEX to RELATED ARTICLES: ARTICLE INDEX to HEATING SYSTEMSOr use the SEARCH BOX found below to Ask a Question or Search InspectApedia

Here is an old 1977 Lennox natural gas furnace tour. It is model # G8D2-82-3I made a video previously just on the startup, this one is more comprehensive.
Visually check heat exchanger for cracks
You will find most cracks form near the back and where the heat exchanger metal bends, Since this is where it will be weakest due manufacturer weakening the metal by bending it.
Watch the flames as the furnace fan starts if you see the flames are blowing around or out the front of the burners then you will need to take a closer look at the heat exchanger
Water test
This test worked best on the old Lennox G8 and would find cracks or pinholes on the heat exchanger that sometime could not be seen.
If there is no air conditioning then it will be easy to access above the heat exchanger through the humidifier. Once the heat exchanger cools down spray water on the heat exchanger from the top insuring full coverage and being careful of the electronics and motors. Then watch inside the burners for water to seep through, A good heat exchanger will not let moisture into burner chamber
Using carbon monoxide detector
Test for carbon monoxide at return air as well at supply air and compare the two readings or test at supply air with burners on then off making sure furnace is not back drafting and compare.
If you take reading once and only at supply air you will not be 100 percent sure the problem is with the heat exchanger. You are testing the accumulation of carbon monoxide over a long period of time from other sources like the furnace or hot water tank back drafting also it could be from outside sources like a vehicles near the intake air.
Reasons for cracks
If the furnace does not have enough combustion air it will cause the furnace to run hotter then designed. Then with more expansion and contraction in the heat exchanger it causes cracks. The gas pressure must be set as per furnace name plate derated for location altitude if too much gas heat exchanger will run too hot.Blower speeds must be checked by comparing furnace temperature difference to name plate rating if running too hot increase fan speed and recheck temperature supply air minus return air.
.
Any crack in a heat exchanger is dangerous and the heat exchanger must be replaced when crack is found
Thank you for visiting my blog I would appreciate any feedback I can get, Please leave a comment on whether my information has helped you. I am always interested in more topic to write so feel free to leave a comment asking about anything related to HVAC-R (Heating, Ventilation, air conditioning, refrigeration).
Thanks for reading my blog
Tagged: carbon monoxide, cracked heat exchanger, heat exchanger
POST a QUESTION or COMMENT about where to find furnace or boiler installation and service or maintenance manuals and guides
InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Lennox Manuals, parts lists, wiring diagrams for HVAC equipment:
Free downloadable manuals for Air Conditioners, Boilers, Furnaces, Heat Pumps. Here we provide free downloadable copies of installation and service manuals for heating, heat pump, and air conditioning equipment, or contact information for the manufacturers who can provide that information for nearly all major brands of HVAC equipment. 
We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. 
Lennox Furnaces, Heat Pumps, Air Conditioners - Contact Information, Manuals, Data Tag Decoding - contact information Free Lennox Furnace, Heat Pump, Air Conditioner Installation & Service Manuals, Wiring Diagrams, Parts ListsLectra system modaris v8. Below we provide HVAC manufacturer contact information and direct links to free downloadable installation, service, and users manuals, focusing on hard-to-find manuals for older models or discontinued equipment. We also provide links to the manufacturer's current model lists and literature.
See LENNOX HVAC MANUALS & PARTS GUIDES Industries Air Conditioners, Furnaces, Heat Pumps , Manuals, Guides
To find a Lennox Dealer near you go to http://www.lennox.com/residential/ and enter your zip code in the box at the web page upper right corner,ORuse the links to Lennox at the left side of this web page (supplied by Google).
Contact information for Lennox industries, in Dallas Texas:
Lennox Corporation - 1-800-9-LENNOX (1-800-953-6669)
2100 Lake Park Blvd.
Richardson, TX 75080
P.O. Box 799900
Dallas, TX 75379-9900
 NAIC: 333415 Air Conditioning & Warm Air Heating Equipment & Commercial & Industrial Refrigeration Equipment Manufacturing; 333414 Heating Equipment Manufacturing, Except Warm Air Furnaces; 333994 Industrial Process Furnace & Oven Manufacturing; 336322 Other Motor Vehicle Electrical & Electronic Equipment Manufacturing; 42173 Warm Air Heating & Air Conditioning Equipment & Supplies Wholesalers
Also see Lennox data tag decoding information under the letter L
 at DATA TAGS on AIR CONDITIONERS
LINKS to OLDER, hard-to-find Lennox HVAC equipment manuals are provided at this website - LENNOX MANUALS & GUIDES - HVAC just below.
The Lennox Pulse furnace safety inspection is (or was) free, but if the furnace has to be cleaned in order to be inspected, the customer could be charged for the cleaning.
See Lennox PULSE FURNACE SAFETY WARNING .
At Technical Reviewers & References we provide more contact information, links to current model list information, product specifications, and installation/operation manuals
Lennox: free, downloadable Lennox Pulse Furnace User's Manuals and Service Manuals are listed just below:Lennox G8 Furnace ManualSafety: owners of older model Lennox Pulse Furnace heating equipment should also see Lennox PULSE FURNACE SAFETY WARNING - Lennox Pulse Furnace Safety Inspection/Warranty Program: Carbon Monoxide Warning
 That document describes carbon monoxide gas (CO) leak safety hazards on certain models of Lennox hot air heating furnaces and announces an inspection and recall/repair program for these systems.
Lennox PULSE FURNACE SAFETY FAQs - web page
Lennox PULSE FURNACE SAFETY WARNING - web page
 See also HEAT EXCHANGER LEAKS for more information about heat exchanger leaks and furnace safety
 and
 See also CARBON MONOXIDE GAS TOXICITYfor information about carbon monoxide.

Also see ARMSTRONG Air: Armstrong oil furnaces, Armstrong gas furnaces, Armsrtong heat pumps, packaged units & air handlers or coils
Lennox AIR COOLED CHILLERS IO MANUAL [PDF] retrieved 2019/01/07 original source http://webmanuals.lennoxeurope.com/Current%20Products/Chillers/Water_cooled_chillers/MCW/Installation%20and%20op.%20manual%20%20(IOM)/CHILLER_AC-IOM-0105-E.pdf
LENNOX CBX AIR HANDLER INSTALLATION MANUAL [PDF], Model: Dave Lennox Signature Collection CBX32MV Unit multi-Position Air Handlers (2011) retrieved 2018/07/31, original source: https://www.lennox.com/lib/legacy-res/pdfs/installation_maintenance/lennox_cbx32mv_iom.pdf
 Excerpt:
This indoor unit is designed for installation with optional field−installed electric heat and a matched remote outdoor unit that is charged with HFC−410A refrigerant. These units, designed for indoor installation in multiple positions, are completely assembled for upflow and horizontal right−hand discharge before being shipped from the factory. 
All CBX32MV air handlers are equipped with a factory−installed, internally mounted check / expansion valve (CTXV), which is suitable for use in HFC−410A applications. 
This air handler is compatible with the ComfortSense® 7000 non−communicating thermostat and non−communicating outdoor units. In addition, this unit has the enhance capability of communicating with the icomfort Touch® thermostat and compatible outdoor units using the Lennox RSBus protocols.
LENNOX CB31MV AIR HANDLER INSTALLATION MANUAL [PDF] (2008)
LENNOX G12 / G12E SERIES FURNACE INSTALLATION MANUAL [PDF] using one of 3 types of fan limit controls: Camstat, Cemco, or Honeywell.
 See also HONEYWELL FAN LIMIT SWITCH WIRING and see also WIRING GUIDES for CAMSTAT, CEMCO, FIRESTAT FAN LIMIT CONTROLS
Lennox G14 Pulse Gas Furnace User's Manual from 1990 #502.596M that supercedes Lennox 502.207M
Lennox GSR14 Pulse Gas Furnace User's Manual from 1990, Lennox# 502.595M that supercedes Lennox 502.206M
Lennox G21Q and G21V Lennox Pulse Gas Furnace User's Manual from 1996, Lennox #503.072M that supercedes the 1996 edition. Lennox Industries, Dallas TX
Lennox GSR21Q and GSR21V Lennox Pulse Gas Furnace User's Manuals from 1998, supercedes the 1996 manuals, Lennox # 503.073M
Lennox GSR21Q Lennox Pulse Furnace Manual from 1991, Lennox # 502.694M 8/91
LENNOX G12 / G12E SERIES FURNACE INSTALLATION MANUAL [PDF] using one of 3 types of fan limit controls: Camstat, Cemco, or Honeywell.
Lennox G12, G12R & G12X Series GAS FURNACE MANUAL [PDF] (8/1990) 
Lennox G12-G12E FURNACE MANUAL [PDF] (10/1987) Gas Furnaces
Lennox G24-200 Series Upflow Gas Furnace Manual, Lennox # 503.614M,1998
Lennox G26 Series Gas Furnace Manual, 1998, #503.533M
Lennox G32V Series Gas Furnace Manual, 2001, #504.391M
Lennox G32Q/V Series Gas Furnace Manual, 2001, #504.392M
Lennox G40DF (X) Series Gas Furnace User's Information Manual, 2001, #504.322M
Lennox G50DF(X) Series Gas Furnace User's Information Manual, 2001, #504.324M
Lennox G60 DF(X) Series Gas Furnace INSTALLATION INSTRUCTIONS [PDF] (05/2009)
Lennox G60DFV(X) Gas Furnace Manual, 2002, #504.577M
Lennox G61MP Series Gas Furnace Manual, 2003, #504.741M
Lennox G81 Gas Furnace Manual [PDF] 6 pages
Lennox RFC AIR CONDITIONING SYTSEM COOLING UNITS [PDF] (1965)
Lennox ROOFTOP UNIT IOM MANUAL BALTIC SERIES [PDF] Valid only for rooftop AC units displaying one of these codes: : GB IR GR DA NO FI IS BCK 02
 - BCK 025- BCK 030- BCK 035- BCK 040- BCK 045- BCK 050BHK 020 - BHK 025- BHK 030- BHK 035- BHK 040- BHK 045- BHK 050BGK 020 - BGK 025- BGK 030- BGK 035- BGK 040- BGK 045- BGK 050BDK 020 - BDK 025- BDK 030- BDK 035- BDK 040- BDK 045-BDK 050 IOM-RT B/0803-E
retrieved 2019/01/07 original source https://www.c-o-k.ru/library/instructions/lennox/kondicionery-promyshlennye/8628/25428.pdf
Lennox 78UGF Series Gas Furnaces, User's Information Manual, 1993, supercedes the 1992 edition, Lennox # 502.840M
Lennox 78RGF Series Gas Furnaces, User's Information Manual, 1993, supercedes 1992, #502.842M
Lennox 90UGF Series Gas Furnace User's Information Manual, 1997, Lennox # 503.629M
Other Lennox owners manuals for air conditioners, air handlers, furnaces, heat pumps, indoor air quality systems, packaged units, water heaters, zone controls and other controls such as thermostats, are provided by Lennox at http://www.lennox.com/support/manuals.asp
Lennox Corporation, 'ELITE® Series R-410A AIR CONDITIONERS INSTALLATION & OPERATION MANUAL' [PDF] (2017), retrieved 2017/07/09,original source: https://www.lennoxpros.com/docs/Technical/210758.pdf
Lennox Corporation, 'INSTALLATION INSTRUCTIONS, Elite® Series XC13 Units, Condensing Units 506635-01' [PDF] (09/2011), extensive 126 page manual, retrieved 12/2/2014, original source: https://www.lennox.com/pdfs/installation_maintenance /Lennox_XC13_IOM.pdf
LENNOX PULSE FURNACES 2 IDI's and 2 Complaints [PDF] (US CPSC), 5 June 1998, includes CPSC records obtained by a law firm under the FOIA Freedom of Information Act. This information includes description of gas odors, detection of gas leaks, and potential safety hazards that could be helpful to other consumers and service technicians.
FORCED HOT AIR FURNACES: Troubleshooting and Repair, Roger Civi, ISBN-13: 978-0071341714, available at the InspectAPedia bookstore (Amazon.com) new and used. (We recommend a number of heating system inspection, diagnosis, and repair books at this Amazon page).
Lennox Signature® Collection CBX40UHV AIR HANDLER UNIT MANUAL [PDF] (2016) Lennox Industries, Dallas TX USA retrieved 2019/11/13, original source: https://resources.lennox.com/fileuploads/a1cfea55-845e-427e-ab0d-57bbcfecd3e5Lennox_CBX40UHV_IOM.pdf
LENNOX Dave Lennox Signature Collection XC15 UNIT INSTALLATION INSTRUCTIONS [PDF] (2008), Lennox Industries, Inc.
Lennox SL-280 SERIES FURNACE MANUAL [PDF] (2017) Users Innformation Manual for the SL280UHNV Series induced draft gas furnaces.
LENNOX XC15 SERIES SPLIT SYSTEM CONDENSER UNIT SERVICE MANUAL [PDF], (2006) Lennox Industries Inc.
 Description: The XC15 is a high efficiency residential split−system condensing unit, which features a scroll compressor and R−410A refrigerant. Units are available in 2, 2−1/2, 3, 3−1/2, 4 and 5 ton sizes. The series is designed for use with an expansion valve only (approved for use with R−410A) in the indoor unit. 
This manual is divided into sections which discuss the major components, refrigerant system, charging procedure, maintenance and operation sequence. Information contained in this manual is intended for use by qualified service technicians only. All specifications are subject to change.
LENNOX XC15 SERIES SPLIT SYSTEM CONDENSER UNIT WIRING DIAGRAM [image file]
LENNOX XC21 INSTALLATION INSTRUCTIONS (outdoor unit) [PDF] Dave Lennox Signature Collection XX21 system (2012)
Lennox Corporation - Current Use and Care Manuals - Installation & Service manuals for current Lennox equipment: air conditioners, air handlers, furnaces, heat pumps, indoor air quality, packaged units, water heating units, zoning products, and equipment controls. Current Lennox documents are at this link: http://www.lennox.com/support/manuals.asp and include this equipment:
 Air Conditioners - - * HS21 Series * HS25 Series * HS26 Series * HS27 Series * HS29 Series * HSXA12 Series * HSXA15 Series - - Air Handlers - - * CB29M/CB30M Series * CB31MV Series * CBX32V/CBX32 Series * CBX32MV/CBX32M Series - - Furnaces - - * 90UGF Series * G24-200 Series * G24M Series * G24M 50Hz Series * G26 Series * G32 Series * G32V Series * G40DF Series * G40UH Series * G43 Series * G50DF Series * G50UH Series * G50i Series * G51 Series * G60DF(X) Series * G60DFV(X) Series * G60UH Series * G60UHV Series * G61 Series * G61V Series * GHR26 Series * GHR32Q & GHR32V Series * HS29 Series - - Heat Pumps - - * HP25 Series * HP29 Series * HPXA12 Series * HPXA15 Series - - Indoor Air Quality - - * PureAir Air Purification System * WB2 & WP2 Humidifier * Healthy Climate Products * PMAC * Germicidal Lights - - Packaged Units - - * 10GCS & 12GCS Series * GCS16, 20 & 20R Series * GCS29 Series * 13GCSX Series * 15GCSX Series - - Water Heating Units - - * CompleteHeat (HM30) * CompleteHeat (HM30) LP * Aqua Plus (RWH21/CB30MWH) - - Zoning Products - - * Harmony Series * Harmony II® Series * Harmony III® Series - - Controls - - * ComfortSense 7000 Series Touchscreen Thermostat * ComfortSense 5000 Series Touchscreen Thermostat * ComfortSense 3000 Series Programmable Thermostat * ComfortSense 3000 Series Non-Programmable Thermostat * SignatureStat * Elite Touchscreen * Merit Programmable Thermostats * Merit Non-Programmable Thermostats * LZP-2 * LZP-4 -
Lennox Corporation - Archived Lennox Documents at this link: http://www.lennox.com/support/archived-docs.asp contains links to service and installation manuals for older equipment no longer sold by the company, and includes: (Most of these are downloadable free here)
Lennox Installation and Operation Instructions - - Air Conditioners * 10 ACB Installation and Operation Instructions Manual * 10 ACC Installation and Operation Instructions Manual * 12 ACB Installation and Operation Instructions Manual * 13 ACC Installation and Operation Instructions Manual * HS14 Installation and Operation Instructions Manual * HS18 Installation and Operation Instructions Manual * HS19 Installation and Operation Instructions Manual * HS20 Installation and Operation Instructions Manual - - Heat Pumps * 10 HPB Installation and Operation Instructions Manual * 12 HPB Installation and Operation Instructions Manual * HP14 Installation and Operation Instructions Manual * HP16 Installation and Operation Instructions Manual * HP18 Installation and Operation Instructions Manual * HP19 Installation and Operation Instructions Manual * HP20 Installation and Operation Instructions Manual * HP22 Installation and Operation Instructions Manual * HP23 Installation and Operation Instructions Manual * HP24 Installation and Operation Instructions Manual * HPXA19 Installation and Operation Instructions Manual - - Homeowner's Manuals - - Furnaces * 78RGF Series Homeowner's Manual * 78UGF Series Homeowner's Manual * 80UHG Series Homeowner's Manual * Efficiency Plus Series Homeowner's Manual * F8AUH Series Homeowner's Manual * G12 Series Homeowner's Manual * G14 Series Homeowner's Manual * G16(R) Series Homeowner's Manual * G17 Series Homeowner's Manual * G17RSeries Homeowner's Manual * G20 Series Homeowner's Manual * G20R Series Homeowner's Manual * G21Q & G21V Series Homeowner's Manual * G23 Series Homeowner's Manual * G25MV Series Homeowner's Manual * G27M Series Homeowner's Manual * G41UF Series Homeowner's Manual * GH19 Series Homeowner's Manual * GSR14 Series Homeowner's Manual * GSR21Q & GSR21V Series Homeowner's Manual - - Air Conditioners * HS32 Series Owner's Manual * HSXA19 Series Owner's Manual - - Heat Pumps * HP21 Series Owner's Manual * HP26 Series Owner's Manual * HP27 Series Owner's Manual * HP32 Series Owner's Manual
Also see MAGIC PAK HVAC Packaged heating & cooling systems
On 2016-06-08 by trevor - age of my Lennox
whats the age of my lennox g8-110t-1a..

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