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KN INSTALLATION AND OPERATION INSTRUCTIONS
Condensate drain line
Figure 23
Condensate drain line connections (KN-2 shown — J-trap config-
uration is the same for KN-4, but mounted directly to a clamping
bracket on the U-channel)
Fill the condensate trap
Before installing the condensate line, you must fill the
condensate trap with water. This will prevent flue products
from escaping into the room. To fill the trap:
• Temporarily attach a 3/8 inch clear plastic hose to the
condensate hose barb (see Figure 23).
• Attach a funnel to the othe end of the hose and hold the
funnel so it is higher than the hose barb.
• Pour water into the funnel until water backs up into the
tube.
• Remove the temporary plastic hose.
The condensate trap must be filled when firing the
boiler to prevent flue gases from escaping into the
room.
Condensate line installation
Condensate tubing material
The condensate tubing must be silicone rubber, 3/8 inch
(9.5 mm)
diameter.
Attachment
Feed the silicone rubber tubing through the condensate line exit
opening and slide the tubing end onto the condensate line hose
barb as shown in Figure 23.
Securing/protecting the condensate line
Secure the tubing
— Secure the condensate line to the floor
with clips or other means to prevent movement.
Protect tubing from damage
— If foot traffic poses a risk to
the tubing, install a cover over the tubing, or some other means
to protect it from damage or movement.
Prevent freezing
— Do not route the line through, or
terminate the line in, any area that could expose the condensate
to freezing temperatures.
Floor drain termination
If the condensate line can be routed to a floor drain, and
applicable codes do not prohibit draining untreated condensate,
terminate the condensate line so condensate can reliably flow to
the drain.
Condensate pump termination
If no gravity drain is available, install a condensate pump. Use
only a pump designed for use with condensing furnaces and
boilers. The pump must have an overflow switch to prevent
damage from overflowing condensate. Wire the switch into the
boiler limit circuit. See the
K N
Control manual for details.
Neutralization
When required by codes or preference, install an appropriate
condensate neutralization system.
Condensate line requirements
Failure to adhere to the following could result in
condensate line leakage, resulting in potential for
severe personal injury, death or substantial property
damage.
❑
Use only silicone rubber tubing, 3/8 inch
(9.5 mm)
diameter.
❑
Protect the condensate line from damage and
secure it in position.
❑
Terminate the condensate line at an appropriate
drain.
❑
Do not install the condensate drain line such that it
could be exposed to freezing temperatures.
❑
Install a condensate pump if no appropriate drain is
available.
❑
Install a condensate neutralizing system when
required.
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