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Discontinued Product Literature
Triangle Tube, the Original Innovator and first to bring fire tube technology to the residential market. We continue to deliver quality, reliable products to customers throughout North America.
Discontinued Product Literature
Discontinued Literature
Air Handler Installation Manual
Air Handler Relay Replacement Kit for Hydronic
Air Handler Capacitor Replacement Kit for Hydronic
Air Handler Freeze Lock-Out Switch Replacement Kit for Hydronic
Air Handler Freeze Protection Switch Replacement Kit for Hydronic
Air Handler Transformer Replacement Kit for Hydronic
Air Handler Time Delay Relay Replacement Kit for Hydronic
Delta Elite Installation and Maintenance Manual
Delta Elite Trouble Shooting Guide
Delta Elite Oil-Fired Direct Vent Instructions
Delta Elite Literature
Delta Performance Installation and Maintenance Manual
Delta Performance Plus Installation and Maintenance Manual
Delta Performance Trouble Shooting Guide
Delta PG and PG Plus Burner and Flue Hood Gasket Seal Kit
Delta Performance Flex-L Appliance Adaptor
Delta Performance Heat Fab Appliance Adaptor
Delta Performance ProTech Appliance Adaptor
Delta Performance Z-Flex Appliance Adaptor
Delta Performance Blower/Motor Replacement Kit
Delta Performance Igniter/Sensor Replacement Kit
Delta Performance Burner Head Replacement Kit
Delta Performance Propane to Natural Gas Conversion Kit
Delta Performance Control Module Replacement Kit
Delta Performance Burner Control Conversion Honeywell Control to UT Control
Delta Performance Natural Gas to Propane Conversion Kit
Delta Performance Pressure Switch Replacement Kit (#29)
Delta Elite and Performance Relay Replacement
Delta Elite and Performance Transformer Replacement
Delta Elite and Performance Operating Thermostat Replacement
Delta Elite and Performance Manual Reset Limit
Delta Elite and Performance Auto Reset Limit
Delta Elite and Performance Burner Mounting Plate Retrofit Kit
Delta Performance Literature
Delta Low Water Cut-Off Device Replacement
Delta Vent Termination Kit with Z-Vent Installation Instructions
Delta Series Warranty
Delta Gas Valve Replacement Kit
Modulating Delta Installation and Maintenance Manual
Modulating Delta Literature
Modulating Delta Vent Supplement
Modulating Delta or Delta Performance Saf-T-Vent SC Concentric Vent
HMG Delta Classic Installation and Maintenance Manual
HMG Delta Classic Electronic Spark Ignition Replacement Kit
HMG Delta Classic Electronic Ignition Cable Replacement Kit
HMG Delta Classic Blower & Capacitor Replacement Kit
HMG Delta Classic Burner Insulation Replacement Kit
HMG Delta Classic Pilot Tubing Replacement Kit
HMG Delta Classic Main Gas Line Replacement Kit
HMG Delta Classic Burner Assembly Replacement Kit
HMG Delta Series Wiring Diagram
HMG-30 High Altitude Conversion Kit
HMG Series Addendum Instructions
HM Series Installation and Maintenance Manual
HM Series Warranty
HM Rectifier Cable Replacement Kit
Horizontal Vent Termination Kit Installation Instruction
Marquis 180 Installation Manual
Marquis 200 Installation Manual
Marquis 180 User's Manual
Marquis 200 User's Manual
Marquis Warranty
Marquis Sales Brochure
Optima Series Literature
Optima Series SZC5 Literature
Optima Series S2S Literature
Optima Series SMV Literature
Optima Series S3S Literature
Optima Series SIM Literature
Optima Series SCC4 Literature
Optima Series SSM Literature
Optima Series SCC4 Installation and Operation Instructions
Optima Series SZC5 Installation and Operation Instructions
Optima Series S2S Installation and Operation Instructions
Optima Series SMV Installation and Operation Instructions
Optima Series SIM Installation and Operation Instructions
Optima Series SSM Installation and Operation Instructions
Optima Series SCCI Installation and Operation Instructions
Optima Series Temperature Sensor Installation and Operation Instructions
Peerless Hygroscopic Air Vent Instructions