LP-293 Rev. 9.24.15
32
BOILER OR
HEATER
INDOOR COMBUSTION AIR
(SINGLE PIPE)
OUTDOOR COMBUSTION AIR
(SINGLE PIPE)
BOILER
OR
HEATER
Figure 19 - Indoor and Outdoor Combustion Air - Single Pipe
I. Condensate Removal System
NOTE: Check with your local gas company to determine if
combustion condensate disposal is permitted in your area. In
the state of Massachusetts, condensate must be neutralized
before entering a drain.
This boiler is a high eciency appliance, and therefore produces
condensate: a by-product of the combustion process. A
condensate collection system with an internal oat switch
monitors condensate level to prevent it from backing up into the
combustion system. There is a ¾” socket connection provided
to connect the outlet of the collection system to a drain or
condensate pump.
Condensate from the boiler is slightly acidic with a pH of 3.2 -
4.5. To avoid long term damage to the drainage system and to
meet local code requirements, HTP recommends neutralizing
condensate with a Condensate Neutralizer Kit (Part # 7450P-212
for EL-80/110/150/220/299/301, Part # 7350P-611 for EL-399).
The neutralizer kit connects to the drain system and contains
limestone chips that neutralize the pH level of the condensate.
The neutralizer kit should be checked annually and the limestone
chips replenished if necessary. When replacing the limestone
chips, take care to ensure chips are no smaller than ½” to avoid
blockage in condensate piping (refer to Figure 20 for piping of
the condensate neutralizer.)
Figure 20 - Condensate Piping
NOTES:
1. Condensate line must be pitched at least ¼” per foot to
properly drain. If this cannot be done, or a very long length
of condensate hose is used, increase the condensate line to a
minimum of 1” ID and place a tee in the line after the condensate
neutralizer to properly reduce vacuum lock in the drain line.
2. PVC or CPVC pipe should be the only material used for
condensate line. Steel, brass, copper, and other metals will be
subject to corrosion or deterioration.
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