56
Installation & Operation Manual
9
Condensate disposal
Condensate drain
1. This boiler is a high efficiency appliance that produces
condensate.
2. The bottom of the boiler has a 1 1/4 inch pipe for
connection of the condensate trap (FIG. 9-1).
3. Slope condensate tubing down and away from the boiler
into a drain or condensate neutralizing filter. Condensate
from the Knight wall mount boiler will be slightly acidic
(typically with a pH from 3 to 5). Install a neutralizing
filter if required by local codes.
A Neutralizer Kit is available from the factory (Kit 3087).
4. Do not expose condensate line to freezing temperatures.
5. 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.
6. A condensate removal pump is required if the boiler is
below the 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 in series with the blocked drain switch
inside the boiler (see FIG. 10-1 on page 58).
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.
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.
CONDENSATE
TRAP
REMOVABLE CAP
FOR CLEANING
TRAP
CONDENSATE DRAIN CONNECTION -
ROUTE TO FLOOR DRAIN OR
NEUTRALIZING FILTER USING
3/4" PVC TUBING
IMG00159
Figure 9-1 Condensate Disposal
