Thomas & Betts LDAP 1200 - Manual (Page 26)

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 26
2) Vent Pipe Diameter
and Length
• Use only one diameter of vent pipe on an installation.
• Minimum vent length is 3 feet (1M).
• Minimum of 1 ft (0.3M) of vertical vent required on venter outlet before installing
an elbow.
Vent pipe diameters and maximum vent lengths in the table apply to both Horizontal
and Vertical vents. Add all straight sections and equivalent lengths for elbows. The
total combined length must not exceed the Maximum Vent Length.
Model LDAP heaters are certified as Category III heaters.
WARNING: Each heater requires its own individual vent pipe run
and vent cap. Manifolding of vent runs can cause recirculation of
combustion products into the building. Failure to comply could
result in severe personal injury or death and/or property damage.
Venting must be in accordance with local codes and the National Fuel Gas Code
Z223.1 or CSA B149.1 and B149.2, Installation Code for Gas Burning Appliances
and Equipment. Local requirements supersede national requirements.
These power-vented heaters are designed to operate safely and efficiently with either
a horizontal or vertical vent. Comply with the specific requirements and instructions.
If this heater is replacing an existing heater, be sure that the vent is sized properly for
the heater being installed and that the existing vent is in good condition. A properly
sized vent system is required for safe operation of the heater. An improperly sized
vent system can cause unsafe conditions and/or create condensation. Do not vent into
an existing gravity vent or chimney.
Installation should be done by a qualified agency in accordance with these instruc-
tions. The qualified service agency installing this system is responsible for the instal-
lation.
1) Type of Vent Pipe
The type of vent pipe is determined by whether the vent is horizontal or vertical.
Horizontal
• Vent pipe approved for a Category III appliance, OR
• Appropriately sealed 26-gauge or heavier galvanized
steel or equivalent single-wall pipe
Vertical
• Vent pipe approved for a Category III appliance, OR
• Appropriately sealed 26-gauge or heavier galvanized
steel or equivalent single-wall pipe
OR, if at least 75% of the equivalent length of the vent run is vertical
• Double-wall (Type B) vent pipe
24. Venting
Venting
Requirements
inches mm inches mm feet M feet M feet M
6 152 45 13.7 15 4.6 7.5 2.3 None
7 178 60 18.3 8 2.4 4 1.2 6" to 7" (152 to 178mm) Increaser
8 203 50 15.2 15 4.6 7.5 2.3 None
10 254 45 13.7 5 1.5 2.5 0.8 8" to 10" (203 to 254mm) Increaser
8 203 50 15.2 15 4.6 7.5 2.3 None
10 254 45 13.7 5 1.5 2.5 0.8 8" to 10" (203 to 254mm) Increaser
1
Includes one 90° elbow at venter outlet.
1200 8 203
400 6 152
800 8 203
Equivalent
Straight Length
for 45° Elbow
Field-Supplied Taper Type
Connection Required at the Venter
Outlet
Model
LDAP
Size
Venter
Outlet
Diameter
Vent Pipe
Diameter
Maximum
Vent Length
1
Eqivalent
Straight Length
for 90° Elbow