Installation Manual

22
equivalent feet (4.6 m). There is no minimum equivalent feet
requirement for the intake air pipe.
Six Inch Pipe
The water heaters covered in this manual are certied to
a minimum length of 6 inch pipe for the vent (exhaust) of 70
equivalent feet (21.3 m). There is no minimum equivalent feet
requirement for the intake air pipe.
MAXIMUM NUMBER OF ELBOWS
The vent pipe may have a maximum of six 90° elbows installed.
The intake air pipe may have a maximum of six 90° elbows
installed. IE: in a Direct Vent conguration each pipe can have
up to six (6) 90° elbows installed. Two (2) 45° elbows equal one
(1) 90° elbow. Each 90° elbow is equivalent to 5 feet (1.5 m) of
linear pipe, 45° elbows are equivalent to 2.5 feet (0.75 m) of
linear pipe.
Note: Refer to Table 10 and Table 11 for equivalent linear pipe
length of AL29-4C
®
45° and 90° elbows.
FACTORY SUPPLIED FITTINGS
The water heater ships with two (2) factory supplied 4 inch
terminations (PVC 45° elbows with debris screen). Factory
supplied vent and intake air terminations or concentric and
low prole terminations must be used. Factory supplied
terminations and installed ttings (exhaust elbow and intake
air connection) add zero equivalent feet to the vent and intake
air piping.
NOTE: 3 inch intake air and/or vent terminations previously
installed on older BTH 300/400 model installations must be
replaced with factory supplied 4 inch or 6 inch terminations
depending on the installed length.
TABLE 7
Number of
90° Elbows
Installed
4 Inch Pipe 6 Inch Pipe
Maximum Feet (Meters) Maximum Feet (Meters)
One (1) 65 feet (19.8 meters) 115 feet (35.0 meters)
Two (2) 60 feet (18.2 meters) 110 feet (33.5 meters)
Three (3) 55 feet (16.8 meters) 105 feet (32.0 meters)
Four (4) 50 feet (15.2 meters) 100 feet (30.5 meters)
Five (5) 45 feet (13.7 meters) 95 feet (29.0 meters)
Six (6) 40 feet (12.2 meters) 90 feet (27.4 meters)
6 INCH EXTENDED VENT TERMINATIONS
When 6 inch intake air or vent pipe is installed using standard
terminations, factory supplied 6 inch terminations must be
used. Contact your local distributor or call the parts department
(phone number listed on the back cover of this manual) to order
6 inch termination(s). See Optional Direct Vent Terminations
on page 12.
The water heaters covered by this manual may be installed in a
Direct Vent conguration using a 6 inch concentric or 6 inch low
prole termination.
Contact your local distributor or call the parts department phone
number listed on the back cover of this manual to order.
• 6” Concentric Termination Part # 9008841005
• 6" Low Prole Termination Part # 9008935005
VENTING REQUIREMENTS
FIELD SUPPLIED FITTINGS
Field supplied ttings should be equivalent to the piping material
being installed. Field installed/supplied ttings will add equivalent
feet to the vent or intake air piping as indicated below. All eld
supplied/installed ttings and piping must be factored into the
equivalent feet calculations.
• 90° elbows (short or long radius) are equivalent to 5 linear
feet (152 cm) of pipe.
• 45° elbows (short or long radius) are equivalent to 2.5 linear
feet (76 cm) of pipe.
Note: Refer to Table 10 and Table 11 for equivalent linear pipe
length of AL29-4C
®
45° and 90° elbows.
PRIMER AND CEMENT
Tetrahydrofuran (THF) primer should be used to prepare the
surfaces of pipe and ttings for solvent welding. If CPVC pipe and
ttings are used, then the proper cement must be used for all joints,
including joining the pipe to the factory provided terminations (PVC
material). PVC Materials should use ASTM D-2564 Grade Cement;
CPVC Materials should use ASTM F-493 Grade Cement.
PIPE SIZE REQUIREMENTS
The water heaters covered in this manual are certied for the use
of 4 and 6 inch pipe for the vent (exhaust) and intake air piping.
If the installed equivalent length for the intake air or vent piping
will be 70 feet (21.3 m) or less, 4 inch pipe must be used. If the
installed equivalent length will be more than 70 feet (21.3 m), 6
inch pipe must be used.
NOTE: Install the pipe size required for the installed equivalent
length of each pipe independently. IE: If the intake air pipe will be
70 equivalent feet or less and the vent pipe will be more than 70
equivalent feet; the intake air pipe must be installed using 4 inch
pipe and the vent must be installed using 6 inch pipe.
MAXIMUM EQUIVALENT LENGTHS
Four Inch Pipe
The water heaters covered in this manual are certied to a
maximum length of 4 inch pipe for the exhaust venting arrangement
of 70 equivalent feet (21.3 m). The certied maximum length of
4 inch pipe for intake air piping is also 70 equivalent feet (21.3
m). IE: On Direct Vent installations both pipes can be up to 70
equivalent feet (21.3 m).
Six Inch Pipe
The water heaters covered in this manual are certied to a
maximum length of 6 inch pipe for the exhaust venting arrangement
of 120 equivalent feet (36.5 m). The certied maximum length of
6 inch pipe for intake air piping is also 120 equivalent feet (36.5
m). IE: On Direct Vent installations both pipes can be up to 120
equivalent feet (36.5 m).
INTAKE AIR AND VENT PIPE CLEARANCES
The minimum clearance from combustible materials for the vent
(exhaust) and intake air piping shall be 0 inches. Vent or intake
air piping passing through a combustible wall or ceiling must be
a continuous run (no joints).
MINIMUM EQUIVALENT LENGTHS
Four Inch Pipe
The water heaters covered in this manual are certied to
a minimum length of 4 inch pipe for the vent (exhaust) of 15