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2
Maintenance schedule
3.
Fill with fresh water until the water begins to pour out of
the drain.
4.
Replace the cap. Press the cap onto the trap until the cap
makes contact with the drain.
5. Replace the retaining screw.
The condensate trap (FIG. 1) must be
WARNING
filled with water during all times of boiler
operation to avoid flue gas emission from
the condensate drain line. Failure to fill
the trap could result in severe personal
injury or death.
Figure 1 Condensate Trap
RETAINING
SCREW
CONDENSATE FROM
HEAT EXCHANGER
Condensate disposal
1. This boiler is a high efficiency appliance that produces
condensate.
2. The side of the boiler has a 1/2 inch PVC union for
connection of a 1/2 inch PVC pipe (FIG. 2).
3. Slope condensate tubing down and away from the
boiler into a drain or condensate neutralizing filter.
Condensate from the Knight boiler will be slightly acidic
(typically with a pH from 3 to 5). Install a neutralizing
filter if required by local codes. Call your qualified service
technician to inspect the boiler and system.
A Neutralizer Kit is available from the factory
(Kit #3087). Call your qualified service technician to
install.
4. Install the 1/2 inch PVC tee assembly (shipped with the
unit) as shown in FIG. 2. Call your qualified service
technician to inspect the boiler and system.
5. Leave the top of the 1/2 inch 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. 2).
(continued)
2" PVC CAP WITH
BLOCKED DRAIN SWITCH
PVC TEE ASSEMBLY
(FACTORY SUPPLIED)
TO FLOOR
DRAIN
Figure 2 Condensate Disposal
User's Information Manual
Use materials approved by the authority
NOTICE
having jurisdiction.
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.
To allow for proper drainage on large
NOTICE
horizontal runs, a second line vent may
be required and tubing size may need to
increase to 1 inch.
The
condensate
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.
qualified service technician to inspect
the boiler and system.
8. 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. Call your qualified service technician to inspect
the boiler and system.
1/2" PVC TEE ASSEMBLY
(FACTORY SUPPLIED)
FLOOR DRAIN OR
DRAIN PAN
In the absence of
line
must
remain
Call your
1/2" PVC UNION
(FACTORY SUPPLIED)
NEUTRALIZER KIT
7
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