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P/N 42-9470 11/07 Copyright 2007 Mestek, Inc.
Cast iron condensing boiler
Cast iron condensing boiler
— Installation and operation manual
Condensate drain line
Figure 23
Connecting a condensate drain line
Fill the condensate trap
Before installing the condensate line, you must fi ll the condensate
trap with water. Th is will prevent fl ue products from escaping
into the room. To fi ll the trap:
Temporarily att ach a 3/8–inch clear plastic hose to the con-
densate hose barb (see Figure 23).
Att ach 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.
Th
e condensate trap must be fi lled when fi ring the
boiler to prevent fl ue gases from escaping into the
room.
Condensate line installation
Condensate tubing material
Th e 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 fl oor
with clips or other means to prevent movement.
Protect tubing from damage
— If foot traffi c 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 termi-
nate 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 fl oor drain, and ap-
plicable codes do not prohibit draining untreated condensate,
terminate the condensate line so condensate can reliably fl ow 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. Th e pump must have an overfl ow switch to prevent
damage from overfl owing condensate. Wire the switch into the
boiler limit circuit. See the
200i
Control manual for details.
Neutralization
When required by codes or preference, install an appropriate
condensate neutralization system.
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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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