Lochinvar KNIGHT WH 55 - 399 - Manual (Page 25)

4
Sidewall direct venting
(continued)
Sidewall termination – optional concentric vent models
Figure 4-9 2" and 3" Concentric Vent Dimensional
Drawing (reference Table 3C on page 19)
Instead of cementing the smaller pipe to
the rain cap, a field-supplied stainless steel
screw may be used to secure the two (2)
components together when field disassembly
is desired for cleaning (see FIG. 4-11).
When using the alternate screw assembly
method, drill a clearance hole in the rain
cap and a pilot hole in the vent pipe for
the screw size being used. Failure to drill
adequate holes may cause cracking of PVC
components, allowing combustion products
to be recirculated. Failure to follow this
warning could result in personal injury or
death.
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.
Figure 4-11 Rain Cap to Vent Pipe Alternate Assembly
6. Install the Y concentric fitting and pipe assembly through
the structure’s hole.
Do not allow insulation or other materials
to accumulate inside the pipe assembly
when installing through the hole.
7. Install the rain cap and small diameter pipe assembly
into the Y concentric fitting and large pipe assembly.
Ensure small diameter pipe is bottomed and cemented
in the Y concentric fitting for #CVK3003 and 3008
installations and fastened tightly into the rubber adapter
for #CVK3007 installations.
8. Secure the assembly to the structure as shown in FIG.
4-12 using field-supplied metal strapping or equivalent
support material.
Ensure termination location clearance
dimensions are as shown in FIG. 4-6.
If assembly needs to be extended to allow
sidewall thickness requirement, the two (2)
pipes supplied in the kit may be replaced
by using the same diameter, field-supplied
SDR-26 PVC (D2241) pipe for CVK3003
and 3008, and standard schedule 40 PVC
for CVK3007. Do not extend dimension
D more than 60 inches (see FIG. 4-9 and
FIG. 4-10).
NOTICE
ƽ WARNING
ƽ WARNING
NOTICE
NOTICE
NOTICE
If assembly needs to be reduced, dimension
D can be as short as possible.
NOTICE
25
Installation & Operation Manual
"B" DIA. PVC
VENT / EXHAUST
"H" DIA.
"D"
"E"
"F"
"G"
3"
(76 MM)
A B C D E F G H
60" 4" 6" 21 1/8" 10" 7 5/8" 3" 6 5/8"
"C" DIA.
"B" DIA.
(1524 MM) (102 MM) (152 MM) (537 MM) (254 MM) (194 MM) (76 MM) (168 MM)
Figure 4-10 4" Concentric Vent Dimensional Drawing
(reference Table 3C on page 19)