Lennox International Inc TUA100S Condensate Drain Through TEE Pipe and Drain Loop, General

3- The air inlet	diameter		shall be 3”	(76mm) on	stainless steel. Seal single wall vent material
45/60/75 units and 4” (100mm) on 100/125 units.					according	to	the	section		A-General
Refer to table 4 for diameter and termination					Recommendations			and	Requirements.
requirements.					Condensate drainage can be collected in a tee pipe
4- Select a wall termination point that will maintain ¼”					section (figure 4) or allowed to drip through the vent
rise per foot slope of horizontal run of vent pipe.					termination, if permitted by local authorities (figure
The vent may be single wall material minimum 26					5).
GSG (0.46mm) galvanized steel or equivalent grade					5- For upward sloped vent a condensate tee and drain
stainless steel. Seal single wall vent material					must be installed within the first 5’ (1.5m) from the
according	to	the	section	A-General	unit heater to protect the appliance. If a flexible
Recommendations and Requirements. In areas					condensate drain line is used, the drain line must
where local authorities having jurisdiction permit, a					include a loop filled with water to prevent
downward slope of maximum ¼” per foot is also					combustion products from entering the structure. If
acceptable. In such cases, the vent must be listed					the unit is shut down for an extended period of time
special vent for Category III appliances or single					and will be exposed to sub-freezing temperatures,
wall vent pipe constructed of number 26 GSG					the condensate may freeze.
(0.46mm) galvanized steel or equivalent grade

CONDENSATE DRAIN THROUGH TEE PIPE AND DRAIN LOOP

UPWARD SLOPE ON HORIZONTAL VENT-COMMERCIAL INSTALLATION

MAY BE SINGLE WALL (26 GSG) GALV. OR EQUIVALENT STAINLESS STEEL SEALED ACCORDING TO THESE INSTALLATION INSTRUCTIONS. SLOPE:+ 1/4 INCH FOR 1 FOOT RUN MINIMUM.

VENT TERMINATION

(TERMINATIONS MAY USE WIRE MESH BIRD SCREEN)

12” (30.5 CM) MIN. FROM

AIR INLET TO VENT TERMINATION (MAY

BE HORIZONTAL OR VERTICAL CLEARANCE)

12” (30.5 CM) MINIMUM ABOVE HIGHEST SNOWFALL

12” (30.5 CM) MIN. FROM WALL TO

VENT TERMINATION

LISTED THIMBLE
THROUGH
COMBUSTIBLE WALL
AIR INLET	DRAIN LOOP WITH WATER
TERMINATION
	TRAP (TO CONDENSATE DRAIN)

	NOTE - MINIMUM HORIZONTAL LENGTH 3 FT. (91.4 CM) NOT
	INCLUDING TERMINATION. REFER TO TABLE 2 FOR
GROUND LEVEL	MAXIMUM LENGTH AND NUMBER OF ELBOWS.

COMMON VENTING NOT ALLOWED WHEN HORIZONTALLY VENTING THE UNIT HEATER.

FIGURE 3

E-Horizontal Venting Concentric Kit - Commercial

1-Horizontal commercial installations are for buildings that are not attached to living spaces. The only concentric vent/adapter/cap kit that may be used is the kit supplied by Lennox Industries. The kit may be used with 45/60/75 units. The vent used to connect from the concentric adapter to the unit may be single wall material minimum 25 GSG (0.46mm) galvanized steel or equivalent grade stainless steel installed according to the sections Venting A-

General Recommendations and Requirements

and C-Horizontal Venting General and D-

Horizontal Venting–Commercial and E-Horizontal

Page 7

Venting Concentric Kit - Commercial. The air inlet may be single wall material or U.L. listed single wall flex vent connector.

2-The vent pipe diameter for horizontal commercial installations shall be 3” (76mm) on 45 units and 4” (100mm) on 60/75 units. Refer to table 4.

3-Refer to table 2 for maximum vent lengths.

4-Refer to figure 7 for kit termination, figure 3 for upward slope with condensate trap, figure 4 for downward slope with trap, and figure 5 for downward slope with condensate drain through cap where permitted by local authorities.