Johnson Controls Residential Gas TM9V MP - Manual (Page 23)

438335-UIM-B-0509
Johnson Controls Unitary Products 23
Example:
An 80,000 BTUH furnace requires 32 feet of pipe and four 90º elbows.
Using 2" pipe and standard elbows, the total equivalent length will be:
This exceeds the 65 foot maximum equivalent length of 2" pipe allowed
for that model and is thus not acceptable.
By using sweep elbows, the total equivalent length will be:
This is less than the 65 foot maximum equivalent length of 2" pipe
allowed for that model and is thus acceptable.
Alternatively, using 3" pipe and standard elbows, the total equivalent
length will be:
This is less than the 90 foot maximum equivalent length of 3" pipe
allowed for that model and is thus acceptable.
*. Vent pipe size must be increased to 3” diameter after connection to furnace
on this model.
COMBUSTION AIR AND VENT PIPING ASSEMBLY
The final assembly procedure for the combustion air and vent piping is
as follows:
1. Cut piping to the proper length beginning at the furnace.
2. Deburr the piping inside and outside.
3. Chamfer (bevel) the outer edges of the piping.
4. Dry-fit the vent piping assembly from the furnace to the outside ter-
mination checking for proper fit support and slope.
5. Dry-fit the combustion air piping assembly checking for proper fit,
support and slope on the following systems:
a. Sealed combustion air systems from the furnace to the out-
side termination.
b. Ventilated combustion air systems from the furnace to the
attic or crawl space termination.
6. Disassemble the combustion air and vent piping, apply cement
primer and the cement per the manufactures instructions. Primer
and cement must conform to ASTM D2564 for PVC, or ASTM
D2235 for ABS piping.
7. All joints must provide a permanent airtight and watertight seal.
8. Support the combustion air and vent piping such that it is angled a
minimum of 1/4” per foot (21 mm/m) so that condensate will flow
back towards the furnace. Piping should be supported with pipe
hangers to prevent sagging.
9. Seal around the openings where the combustion air and / or vent
piping pass through the roof or sidewalls.
COMBUSTION AIR / VENTING
TABLE 10: Equivalent Length of Fittings
Fitting Equivalent Length
2" 90º sweep elbow 5 feet of 2" pipe
2" 45º sweep elbow 2-1/2 feet of 2" pipe
2" 90º standard elbow 10 feet of 2" pipe
2" 45º standard elbow 5 feet of 2" pipe
3" 90º sweep elbow 5 feet of 3" pipe
3" 45º sweep elbow 2-1/2 feet of 3" pipe
3" 90º standard elbow 10 feet of 3" pipe
3" 45º standard elbow 5 feet of 3" pipe
2" corrugated connector 10 feet of 2" pipe
3" corrugated connector 10 feet of 3" pipe
32 feet of 2" pipe = 32 equivalent feet
4 - 90º standard 2" elbows = (4x10) = 40 equivalent feet
Total = 72 equivalent feet of 2" pipe
32 feet of 2" pipe = 32 equivalent feet
4 - 90º sweep 2" elbows = (4x5) = 20 equivalent feet
Total = 52 equivalent feet of 2" pipe
32 feet of 3" pipe = 32 equivalent feet
4 - 90º standard 2" elbows = (4x5) = 40 equivalent feet
Total = 72 equivalent feet of 3" pipe
TABLE 11: Combustion Air Intake and Vent Connection Size at Furnace
(All Models)
FURNACE VENT CONNECTION SIZES
Furnace Input
40 - 100 MBH
(17.5 - 29.3 kW)
120 - 130 MBH
(35.2 - 39.6 kW)
Intake Pipe Size 2” (5.1 cm) 3” (7.6 cm)
Vent Pipe Size 2” (5.1 cm) 2” (5.1 cm)
Accessory concentric vent / intake termination kits 1CT0302 and
1CT0303 are available and approved for use with these furnaces.
Horizontal sidewall vent terminations kits 1HT0901 & 1HT0902 are
also approved for use with these furnaces.
Furnace vent pipe connections are sized for 2” (5.1 cm). pipe. Any
pipe size change must be made outside the furnace casing in a ver-
tical pipe section to allow proper drainage of condensate. An offset
using two 45º (degree) elbows will be required for plenum clear-
ance when the vent is increased to 3” (7.6 cm).
Solvent cements are flammable and must be used in well-ventilated
areas only. Keep them away from heat, sparks and open flames.
Do not breathe vapors and avoid contact with skin and eyes.
The vent must be installed with the minimum required clearances,
and must comply with local codes and requirements.