Termination And Fittings; Multiple Vent/Air Terminations - Lochinvar 400 Installation & Operation Manual

4
Sidewall direct venting
Prepare wall penetrations (Alternate - Field
Supplied Option)
1. Air pipe penetration:
a. Cut a hole for the air pipe. Size the air pipe hole as
close as desired to the air pipe outside diameter.
2. Vent pipe penetration:
a. Cut a hole for the vent pipe. For either combustible
or noncombustible construction, size the vent pipe
hole with at least a 1/2 inch clearance around the vent
pipe outer diameter:
• 5½ inch hole (140 mm) hole for 4 inch (102 mm)
vent pipe
• 7½ inch hole (191 mm) hole for 6 inch (152 mm)
vent pipe
b. Insert a galvanized metal thimble in the vent pipe
hole as shown in FIG. 4-5B.
3. Use a sidewall termination plate as a template for correct
location of hole centers.
4. Follow all local codes for isolation of vent pipe when passing
through floors or walls.
5. Seal exterior openings thoroughly with exterior caulk.
Figure 4-5B A Typical Sidewall Termination Assembly
- Models 400 - 801 PVC/CPVC or Stainless Steel
SIDEWALL
TERMINATION PLATE
VENT
PIPING
BIRD SCREEN
ELBOW
BIRD SCREEN

Termination and fittings

1. Prepare the vent termination elbow and the air termination
elbow (FIG. 4-5B) by inserting bird screens. Bird screens
can be obtained locally.
2. When completed, the air termination coupling must be
oriented at least 12 inches (305 mm) below the vent
termination and at least 12 inches (305 mm) above grade or
snow line as shown in FIG. 4-1A, page 23.
3. Maintain the required dimensions of the finished
termination piping as shown in FIG. 4-1A, page 23.
4. Do not extend exposed vent pipe outside of building more
than shown in this document. Condensate could freeze and
block vent pipe.
5. PVC/CPVC terminations are designed to accommodate any
wall thickness of standard constructions per the directions
found in this manual.
6. Stainless steel terminations are designed to penetrate walls
with a thickness up to 9.25 inches of standard construction.
26
GALVANIZED
THIMBLE
(WHEN REQUIRED BY LOCAL CODES)
ELBOW
AIR PIPING
Installation & Operation Manual

Multiple vent/air terminations

1. When terminating multiple Knight XL's terminate each
vent/air connection as described in this manual
(FIG. 4-6A).
All vent pipes and air inlets must
WARNING
terminate at the same height to avoid
possibility of severe personal injury,
death, or substantial property damage.
2. Place wall penetrations to obtain minimum clearance of
12 inches (305 mm) between vent pipe and adjacent air
inlet elbow, as shown in FIG. 4-6A for U.S. installations.
For Canadian installations, provide clearances required by
CSA B149.1 Installation Code.
3. The air inlet of a Knight XL is part of a direct vent
connection. It is not classified as a forced air intake with
regard to spacing from adjacent boiler vents.
Figure 4-6A Multiple Vent Terminations (must also
comply with Figure 4-1A)
12" MIN. BETWEEN EDGE OF AIR
INLET AND ADJACENT VENT OUTLET
VENT
VENT / AIR
TERMINATION
Figure 4-6B Alternate Multiple Vent Terminations
w/Field Supplied Fittings (must also comply with
Figure 4-1B)
VENT
AIR
AIR
12" (305 MM) MIN
15" (381 MM) MAX
12" (305 MM) MIN. BETWEEN EDGE
OF AIR PIPE AND ADJACENT VENT
PIPE