Lochinvar 800 - Manual (Page 33)

Installation & Operation Manual
33
5
Vertical direct venting
(continued)
Vertical termination – optional concentric vent: Models 399 - 600 Only
ELBOW
(FIELD SUPPLIED)
SUPPORT
(FIELD SUPPLIED)
ROOF BOOT /
FLASHING
(FIELD SUPPLIED)
VENT
COMBUSTION
AIR
VENT
12" (305 MM) (18" (457 MM) FOR CANADA)
MINIMUM CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL. MAXIMUM OF
24” (610 MM) ABOVE ROOF.
COMBUSTION
AIR
Figure 5-6 Concentric Vent Roof Installation
Ensure termination height is above the
roof surface or anticipated snow level
(12 inches (305 mm) in U.S.A. or 18
inches (457 mm) in Canada) as shown in
FIG. 5-4, page 32.
If assembly is too short to meet height
requirement, the two (2) pipes supplied in
the kit may be replaced by using the same
diameter, field supplied standard schedule
40 PVC for CVK3007. Do not extend
dimension D* more than 60 inches
(1524 mm) (see FIG. 4-9, page 28).
CAUTION
DO NOT use field-supplied couplings to
extend pipes. Airflow restriction will
occur.
6. Install the rain cap and the small diameter pipe assembly
into the roof penetration assembly. Ensure the small
diameter pipe is fastened tightly into the rubber adapter
for #CVK3007 installations.
7. Cement the appliance combustion air and vent pipes to
the concentric vent termination assembly. See FIG. 5-6
for proper pipe attachment.
8. Operate the appliance through one (1) heat cycle to
ensure combustion air and vent pipes are properly
connected to the concentric vent termination
connections.
Multiventing vertical terminations
When two (2) or more direct vent appliances are vented near
each other, each appliance must be individually vented (see
FIG. 5-7). NEVER common vent or breach vent this
appliance. When two (2) or more direct vent appliances are
vented near each other, two (2) vent terminations may be
installed as shown in FIG. 5-7. The next two (2) terminations
must be at least 36 inches (914 mm) away from the first two
(2) terminations. It is important that vent terminations be
made as shown to avoid recirculation of flue gases.
Dimension A in FIG. 5-7 represents the distance between
pipes or rain shields, as touching or a 2 inch (51 mm)
maximum separation.
VENT
(TYP)
36" (914 MM)
MIN.
"A"
COMBUSTION
AIR (TYPICAL)
12" (305 MM) (18" (457 MM)
FOR CANADA) MINIMUM
CLEARANCE ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL. MAXIMUM OF
24" (610 MM) ABOVE ROOF.
DIMENSTION "A" IS TOUCHING
OR 2" (51 MM) MAXIMUM
SEPARATION
Figure 5-7 Concentric Vent and Combustion Air Vertical
Termination (Dimension A as Touching or 2 inches
(51 mm) Maximum Separation)
Do not operate the appliance with the rain
cap removed or recirculation of
combustion products may occur. Water
may also collect inside the larger
combustion air pipe and flow to the
burner enclosure. Failure to follow this
warning could result in product damage
or improper operation, personal injury, or
death.
4. Install the Y concentric fitting pipe assembly up through
the structure’s hole and field supplied roof boot/flashing.
Do not allow insulation or other materials
to accumulate inside the pipe assembly
when installing through the hole.
5. Secure the assembly to the roof structure as shown below
in FIG. 5-6 using field supplied metal strapping or
equivalent support material.
ƽ WARNING
NOTICE
NOTICE
NOTICE