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Installation & Operation Manual
47
9 Condensate disposal
Condensate drain
1. This boiler is a high efficiency appliance that produces
condensate.
2. The side of the boiler has a 1/2 inch (12.7 mm) PVC
union for connection of a 1/2 inch (12.7 mm) PVC pipe
(FIG. 9-1).
3. Slope condensate tubing down and away from the boiler
into a drain or condensate neutralizing filter. Condensate
from the Knight XL will be slightly acidic (typically with
a pH from 3 to 5). Install a neutralizing filter if required
by local codes.
A Neutralizer Kit (FIG. 9-1) is available from the factory
(KIT3087 for Models 399 - 500 and KIT3046 for Models
600 - 800).
4. Install the 1/2 inch (12.7 mm) PVC tee assembly (shipped
with the unit) as shown in FIG. 9-1.
5. Leave the top of the 1/2 inch (12.7 mm) tee OPEN. This
is needed as a vacuum break.
6. Do not expose condensate line to freezing temperatures.
7. Use only plastic tubing or piping as a condensate drain
line (FIG. 9-1).
Use materials approved by the authority
having jurisdiction. In the absence of other
authority, PVC and CPVC pipe must comply
with ASTM D1785 or D2845. Cement and
primer must comply with ASME D2564 or
F493. For Canada use CSA or ULC certified
PVC or CPVC pipe, fittings, and cement.
8. A condensate removal pump is required if boiler is below
drain. When installing a condensate pump, select one
approved for use with condensing boilers and furnaces. The
pump should have an overflow switch to prevent property
damage from condensate spillage. The switch should be
wired to the auxiliary device proving switch terminals on
the low voltage connection board.
NOTICE
NOTICE
To allow for proper drainage on large
horizontal runs, a second line vent may be
required and tubing size may need to increase
to 1 inch (25 mm).
The condensate line must remain
unobstructed, allowing free flow of
condensate. If condensate is allowed to
freeze in the line or if the line is obstructed in
any other manner, condensate can exit from
the boiler tee, resulting in potential water
damage to property.
1/2" (12.7 mm) PVC UNION
(FACTORY SUPPLIED)
NEUTRALIZER KIT
FLOOR DRAIN OR
DRAIN PAN
1/2" (12.7 mm) PVC TEE ASSEMBLY
(FACTORY SUPPLIED)
Figure 9-1 Condensate Disposal
KIT3087 shown for illustration purposes.