Trane UD1B100A9H31B, UD1D120A9H51B, UD1B060A9H31B, UD1C080A9H41B Installer’s Guide, Vent Piping

VENT PIPING

These furnaces have been classified as Fan-Assisted Combustion System, Category I furnaces under the “latest edition” provisions of ANSI Z21.47 and CAN/ CGA 2.3 standards. Category I furnaces operate with a non-positive vent static pressure and with a flue loss of not less than 17 percent.

NOTE:

If desired, a side wall termination can be accomplished through the use of an “add-on” draft inducer. The in- ducer must be installed according to the inducer manufacturer’s instructions. Set the barometric pres- sure relief to achieve -0.02 inch water column.

NOTE: When the downflow furnace is vented through the left side of the furnace cabinet using the provided cutout, Type B vent piping must be used.

The furnace shall be connected to a factory built chim- ney or vent complying with a recognized standard, or a masonry or concrete chimney lined with a lining mate- rial acceptable to the authority having jurisdiction.

▲! WARNING

Furnace venting into an unlined masonry chimney or concrete chimney is prohibited.

Failure to follow this warning could result in property damage, personal injury, or death.

VENTING INTO A MASONRY CHIMNEY

If the chimney is oversized, the liner is inadequate, or flue-gas condensation is a problem in your area, con- sider using the chimney as a pathway or chase for type “B” vent or flexible vent liner. If flexible liner material is used, size the vent using the “B” vent tables, then re- duce the maximum capacity by 20% (multiply 0.80 times the maximum capacity). Masonry Chimney Kit BAYVENT800B may be used with these furnaces (Up- flow model furnaces only) to allow venting into a ma- sonry chimney. Refer to the BAYVENT800B Installer’s Guide for application requirements.

INTERNAL MASONRY CHIMNEYS

Venting of fan assisted appliances into a lined, internal masonry chimney is allowed only if it is common vented with at least one natural draft appliance; OR, if the chimney is lined with type “B”, double wall vent or suit- able flexible liner material (See Table 7).

▲! WARNING

The chimney liner must be thoroughly inspected to in- sure no cracks or other potential areas for flue gas leaks are present in the liner. Liner leaks will result in early deterioration of the chimney.

Failure to follow this warning could result in carbon monoxide poisoning or death.

Installer’s Guide

NOTE:

The following section does not apply if BAYVENT800B (Masonry Chimney Vent Kit) is used. All instructions with the kit must be followed.

TABLE 7

MASONRY CHIMNEY VENTING

	Tile Lined Chimney		Chimney Lining
				Flexible
Type Furnace	Internal	External	“B” Vent	Metal Liner
Single Fan	No	No	Yes	*Yes
Assist
Fan Assist
+	No	No	Yes	*Yes
Fan Assist
Fan Assist
+	Yes	No	Yes	*Yes
Natural

*Flexible chimney liner size is determined by using the type “B” vent size for the available BTUH input, then reducing the maximum capacity by 20% (multiply maximum capacity times 0.80). The minimum capacity is the same as shown in the “B” vent tables.

External Masonry Chimney

Venting of fan assisted appliances into external chim- neys (one or more walls exposed to outdoor tempera- tures), requires the chimney be lined with type “B”, double wall vent or suitable flexible chimney liner ma- terial. This applies in all combinations of common vent- ing as well as for fan assisted appliances vented alone.

▲! WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow the installation instructions for the venting system being placed into operation could re- sult in carbon monoxide poisoning or death.

The following installation practices are recommended to minimize corrosion caused by condensation of flue prod- ucts in the furnace and flue gas system.

1.Avoid an excessive number of bends.

2.Horizontal runs should pitch upward at least 1/4" per foot.

3.Horizontal runs should be as short as possible.

4.All vent pipe or connectors should be securely sup- ported and must be inserted into, but not beyond the inside wall at the chimney vent.

5.When vent connections must pass through walls or partitions of combustible material, a thimble must be used and installed according to local codes.

6.Vent pipe through the roof should be extended to a height determined by National Fuel Gas Code or local codes. It should be capped properly to prevent rain water from entering the vent. Roof exit should be waterproofed.

7.Use type “B” double wall vent when vent pipe is routed through cool spaces (below 60° F.).

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