Johnson Controls TM9T*MP Downward Venting, Outdoor Combustion Air, Combustion AIR Supply

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505309-UIM-D-0511

DOWNWARD VENTING

In some applications, it may be necessary to run the vent pipe and air intake downwards. If this is to be done, the following rules must be fol- lowed.

•A condensate trap hose must be connected to both the air intake pipe and the vent pipe at the lowest part of the horizontal run.

•The condensate drain trap must have a trap of a minimum of six inches.

•The total vertical downward distance must not exceed sixteen feet.

•The condensate drain hose must be connected to a condensate drain pump, a open or vented drain or into the condensate drain line from the furnace.

•The condensate drain lines must not pass through unconditioned spaces where the temperature may fall below freezing.

•The condensate drain line must be primed at the initial start-up prior to the start of heating season.

16’ MAX

Outdoor Combustion Air

Combustion Air Intake/Vent Connections

This installation requires combustion air to be brought in from outdoors. This requires a properly sized pipe (Shown in Figure 35) that will bring air in from the outdoors to the furnace combustion air intake collar on the burner box. The second pipe (Shown in Figure 35) is the furnace vent pipe.

NOTICE

An optional plastic birdscreen is shipped in the loose parts bag with every furnace. This may be installed in the intake collar to prevent any small objects from entering the furnace.

The combustion air intake pipe should be located either through the wall (horizontal or side vent) or through the roof (vertical vent). Care should be taken to locate side vented systems where trees or shrubs will not block or restrict supply air from entering the terminal.

Also, the terminal assembly should be located as far as possible from a swimming pool or a location where swimming pool chemicals might be stored. Be sure the terminal assembly follows the outdoor clearances listed in Section #1 “Outdoor Air Contaminants.”

6” MIN.

6” MIN.

FIGURE 35: Downward Venting

COMBUSTION AIR SUPPLY

Connects to collar on top of burner box

Vent pipe cements into socket just above top panel

Or vent pipe may be clamped into outlet of drain coupling

All installations must comply with Section 5.3, Air for Combustion and Ventilation of the National Fuel Gas Code, ANSI Z223.1 or Sections 7.2, 7.3 or 7.4 of CAN/CGA B149.1 or .2 Installation Code - latest edi- tions.

This furnace is certified to be installed with one of three possible com- bustion air intake configurations.

1.

OUTDOOR COMBUSTION AIR: This is a direct vent configuration

 

where the combustion air is supplied through a PVC or ABS pipe

 

that is connected to the PVC coupling attached to the furnace and is

 

terminated in the same atmospheric zone as the vent. This type of

 

installation is approved on all models. Refer to Figure 35.

2.

AMBIENT COMBUSTION AIR: Combustion air is supplied from

 

the area surrounding the furnace through openings in the furnace

 

casing. The combustion air and the vent pipes are not terminated in

 

the same atmospheric zone. Refer to Figure 21 for vent termina-

FIGURE 36: Direct Vent Air Intake Connection and Vent Connection

Ambient Combustion Air Supply

This type installation will draw the air required for combustion from within the space surrounding the appliance and from areas or rooms adjacent to the space surrounding the appliance. This may be from within the space in a non-confined location or it may be brought into the furnace area from outdoors through permanent openings or ducts. It is not piped directly into the furnace. A single, properly sized pipe from the furnace vent connector to the outdoors must be provided. It is recom- mended that the supplied intake coupling & 18” of pipe be attached to the furnace to prevent accidental blockage of the combustion air intake.

tions. Refer to "Ambient Combustion Air Supply" for proper installa-

tion. Refer to Figure 36.

3. VENTILATED COMBUSTION AIR: Combustion air is supplied

through a PVC or ABS pipe that is connected to the PVC coupling

attached to the burner box and is terminated in a ventilated attic or

crawl space. The combustion air and the vent pipes are not termi-

nated in the same atmospheric zone. Refer to Figure 38 for attic

and crawl space termination. Only the combustion air intake may

terminate in the attic. The vent must terminate outside.

COMBUSTION AIR

Vent pipe cements into socket just above top panel

Or vent pipe may be clamped into outlet of drain coupling

FIGURE 37: Combustion Airflow Path Through The Furnace Casing

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Johnson Controls Unitary Products

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Contents List of Figures Models TM9T*MPList of Sections List of TablesSafety Requirements Section I SafetySpecific Safety Rules and Precautions Combustion AIR Quality List of Contaminants Codes and StandardsInspection Furnace Location and ClearancesDuctwork General Information Floor Base and Ductwork Installation DownflowSection II Ductwork Duct FlangesFurnace Assembly MC & FC Series Coils Coil InstallationCOIL/FURNACE Assembly MC/FC/PC Series Coils Coil Flange InstallationBottom Return and Attic Installations Coil / Furnace Assembly HC Series CoilsDownflow Duct Connectors Critical Coil ProjectionHorizontal Application Attic InstallationSuspended Furnace / Crawl Space Installation Downflow ApplicationSide Return Filter InstallationSection III Filters Section IV GAS Piping GAS SafetyGAS Piping Installation Horizontal FiltersElectrical Power Connections Section V Electrical PowerHigh Altitude Pressure Switch Conversion GAS Orifice Conversion for Propane LPLOW Voltage Control Wiring Connections Supply Voltage ConnectionsTwo Stage Air Conditioner Two Stage PSC Furnace PP32U70124 DN22H00124 DP22U70124TWO Stage PSC Furnace OD Models Section VI Twinning Condensate Drain Location Twinning InstructionsTwinning Operation Condensate hoses must slope downwards at all pointsCondensate Drain Termination Typical. Combustion Pipe Drain TeeWill cause the furnace Airflow Horizontal Left Right Configuration Johnson ControlsCombustion AIR/VENT Pipe Sizing Combustion AIR and Vent SafetySection Viii Combustion AIR and Vent System Model Input Pipe Size Maximum Combustion AIR / Venting Combustion AIR and Vent Piping Assembly Elbow a Dimension Fitting Equivalent LengthVent Clearances Home LayoutVenting Multiple Units Vent SystemVent Applications and Termination Combustion AIR Supply Downward VentingOutdoor Combustion Air Ambient Combustion Air SupplyAir Supply Openings and Ducts Combustion Air Source From OutdoorsDampers, Louvers and Grilles Canada Only Free AreaVentilated Combustion Air Termination Specially Engineered InstallationsVentilated Combustion Air Vent Blower RotationCalculating the Furnace Input NAT. GAS Section IX START-UP AdjustmentsGAS Piping Leak Check Ignition System SequenceRevolution Cu Ft Seconds ForRead the manifold gas pressure Adjustment of Manifold GAS Pressure & Input RateRead the inlet gas pressure Adjustment of Temperature Rise Adjustment of FAN Control SettingsLeft Side Airflow Data Scfm Blower Performance CFM Any Position without filterBottom Airflow Data Scfm Section X Safety Controls Section XI Normal Operation and DiagnosticsFurnace Control Diagnostics Fabricated Parts Section XII Replacement Parts ListDiagnostic Fault Code Storage and Retrieval Section Xiii Wiring Diagram Wiring DiagramJohnson Controls Unitary Products York Drive Norman, OK
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