Nordyne G6RD 93+, G6RL 90+, G6RC 90+ Return Air, Venting and Combustion AIR Requirements

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!WARNING:

Products of combustion must not be allowed to enter the return air ductwork or the circulating air supply. Failure to prevent products of combustion from being circulated into the living space can create potentially hazardous con- ditions including carbon monoxide poisoning that could result in per- sonal injury or death.

All return ductwork must be ad- equately sealed, all joints must be taped, and the ductwork must be secured to the furnace with sheet metal screws. When return air is provided through the bottom of the furnace, the joint between the furnace and the re- turn air plenum must be sealed.

The floor or platform on which the furnace is mounted must provide sound physical support of the furnace with no gaps, cracks, or sagging be- tween the furnace and the floor or platform.

Return air and circulating air ductwork must not be connected to any other heat producing device such as a fire- place insert, stove, etc.

Return Air

The return air ductwork may be connected to any or all of the following: left side return, right side return, or bottom return. Tables 1 and 2 show the airflow data for each furnace model.

Where maximum airflow is 1800 CFM or more two openings must be used.

VENTING AND COMBUSTION AIR REQUIREMENTS

NORDYNE condensing furnaces may be in- stalled with outdoor combustion air piped di- rectly to the furnace, or without such special piping. Codes refer to the former as "direct vent" or "two pipe" installation. Installation with air taken from around the furnace is sometimes referred to as "one pipe" installation - i.e. only the vent (exhaust) pipe is provided.

An important consideration in selecting one or two pipe installation is the quality of the combus- tion air. Indoor air is sometimes contaminated with various household chemicals which can cause severe corrosion in the furnace combus- tion system. Some common sources of these chemicals are detergents, bleaches, aerosol sprays, and cleaning solvents. Unless indoor air is known to be free of these materials, two pipe installation is recommended.

Provisions must be made for adequate supply of air for combustion and ventilation. For United States installations, the adequacy of air provi- sions can be determined by consulting the cur- rent version of the National Fuel Gas Code (ANSI Z223.1/NPFA-54). For Canadian installa- tions, requirements are specified in the National Standard of Canada (CAN/CGA B149.1 & .2). Consult local codes for special requirements.

NOTE: If the furnace is operated without ad- equate air for combustion and ventilation, it may not perform properly. Furnace components may be strained by high temperature and could fail prematurely.

!WARNING:

Furnace installation using methods other than those described in the fol- lowing sections must comply with the National Fuel Gas Code and all appli- cable local codes to provide sufficient combustion air for the furnace.

G6RC/G6RD

Protective Screen

G6RL

 

Figure 8. Protective Screen for One Pipe

Installations

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Contents What to do if YOU Smell GAS Installation InstructionsPage Table of Contents Upflow G6RC & G6RD Furnaces DimensionsDownflow G6RL Furnace High 1910 1860 1780 1700 1620 1520 1420 Furnace Airflow DataModel Input Motor Number Btuh Speed Clearances to Combustible Materials Installation Requirements Requirements and CodesDownflow Warning G6RL Models Horizontal InstallationsSupply AIR Plenum Installation LocationFurnace on a Concrete Slab Circulating AIR SupplyVenting and Combustion AIR Requirements Return Air40,000 100 sq. 60,000 80,000 MinimumFree Area Air From Inside Air Requirements For One-Pipe InstallationInstallation In An Unconfined Space Installation In a Confined SpaceAir Directly Through An Exterior Wall Venting RequirementsVent Pipe Material Vent Pipe Length and DiameterPipe Routing and Support Vent Pipe InstallationSolution ExampleG6RL Downflow Furnaces G6RC & G6RD Upflow FurnacesG6RC & G6RD Upflow Furnaces G6RC & G6RD UpflowFurnaces G6RL Downflow FurnacesVent Termination Clearances Location of Outdoor TerminationsHorizontal Venting Alternate Horizontal Vent InstallationConcentric Vent Termination Vertical VentingVent Freezing Protection Vertical Vent Termination Drainage of Condensate from FurnaceLeak Check GAS Supply and PipingLP/Propane Gas Sea Level and High Altitude Conversion ConversionHigh Altitude Application Natural Gas High Altitude ConversionLine Voltage Wiring Electrical WiringAbove Sea Level START-UP and AdjustmentsLow Voltage Wiring Furnace Rating Orifice Drill Size Plate Input Btu/h NatElectrical Data Start-Up ProcedureVerifying and Adjusting Firing Rate Verifying Burner Operation Verifying and Adjusting Temperature RiseGas Flow Rate GAS Flow Rate Cubic Feet PER HourDescription of Components Verifying Operation of the Supply Air Limit SwitchFor G6RC, G6RD and G6RL Residential Furnaces G6RC, G6RD and G6RL Integrated Control Board System DiagramSystem Operation Information MaintenanceLocation of Major Components G6RL Downflow FurnaceSequence of Operation Heating ModeCooling Mode Twinning of Two Furnaces Fan ModeFurnace Fails to Operate Fuel Type INSTALLATION/PERFORMANCE Check List¢707931*¤