LP-179 Rev. 6.7.16
28
BOILER OR
HEATER
INDOOR COMBUSTION AIR
(SINGLE PIPE)
OUTDOOR COMBUSTION AIR
(SINGLE PIPE)
BOILER
OR
HEATER
Figure 21 - 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 condensing high eciency water heater has a condensate
removal system. Condensate is water vapor derived from
combustion products, similar to that produced by an automobile
when it is initially started. It is very important that the condensate
line is sloped down away from the heater and to a suitable drain.
If the heater condensate outlet is lower than the drain, you must
use a condensate removal pump (kit p/n 554200 available from
HTP). If required by local authorities, a condensate lter of lime
crystals, marble, or phosphate chips will neutralize slightly acidic
condensate. This can be installed in the eld and purchased from
HTP (p/n 7450P-212).
The condensate line must remain unobstructed. If allowed to
freeze in the line or obstructed in any other manner, condensate
can exit from the water heater tee, resulting in potential water
damage to property. When installing a condensate pump, select
one approved for use with condensing heaters and furnaces. The
condensate pump should have an overow switch to prevent
property damage from spillage. Condensate from the heater
will be slightly acidic (pH from 3.2 to 4.5). Install a neutralizing
lter if required by local codes.
Power to the optional condensate pump is continuous. When the
water heater is powered o the condensate pump will remain
on. It is important to remember to turn o the condensate pump
when powering down the water heater. Failure to do so could
result in property damage, severe personal injury, or death.
Figure 22 - 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.
3. A frozen condensate line could result in a blocked vent
condition. It is very important to protect the condensate line from
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