lp-441 Rev. 004 Rel. 000 Date 7.2.21
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Part 6 - Condensate Removal
Figure 17 - Condensate Piping
Power to the optional condensate pump is continuous. When the
water heater is powered off the condensate pump will remain
on. It is important to remember to turn off the condensate pump
when powering down the water heater. Failure to do so could
result in property damage, severe personal injury, or death.
This condensing high efficiency appliance 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 appliance and to a suitable
drain.
The condensate line must remain unobstructed. If allowed to
freeze in the line or obstructed in any other manner, condensate
can exit from the appliance tee, resulting in potential water
damage to property.
When installing a condensate pump, select one approved for use
with condensing boilers and furnaces. The condensate pump
should have an overflow switch to prevent property damage from
spillage.
Condensate from the appliance will be slightly acidic (pH from
3.2 to 4.5). Check with your local gas company to determine if
combustion condensate disposal is permitted in your area. Install
a neutralizing filter if required by local codes.
NOTES:
1. Due to its efficient design, the appliance produces condensate
(water) as a normal by-product. This condensate is acidic, with a pH
level between 2 and 4.5. This condensate must be drained away from
the appliance and disposed in accordance with all local regulations.
2. The condensate line should be as short as possible and must be
pitched at least ¼” per foot to properly drain. If this cannot be done,
increase the condensate line and place a tee in the line to properly
reduce vacuum lock in the drain line. Tees should be placed after the
condensate neutralizer (if used).
3. Use corrosion-resistant materials to drain condensate. Use flexible
plastic hose or tube, PVC, or CPVC pipe. PVC or CPVC pipe must
comply with ASTM D1785, F441, or D2665. Cement must comply
with ASTM D2564 for PVC pipe or F493 for CPVC pipe. For Canadian
applications, use CSA or ULC certified flexible tube, PVC or CPVC pipe,
fittings, and cement.
4. If using flexible tube, place an overflow tee in the tube line to
prevent condensate backing up into the appliance if the tube should
kink. Ensure the overflow tee is positioned near a drain or in a location
that will not damage the surrounding area.
5. Do not reduce the size of the condensate line. The line must at
minimum equal the diameter of the line included with the appliance.
6. A frozen condensate line could result in a blocked vent condition.
It is very important to protect the condensate line from freezing
temperatures or any type of blockage. In installations that may
encounter sustained freezing conditions, the use of heat tape is
recommended to avoid freezing of the condensate line. Longer
condensate runs are more prone to freezing.
7. Support of the condensate line may be necessary to avoid blockage
of the condensate flow.
8. Local building codes may require an in-line neutralizer to be installed
(not included) to treat the condensate. See Figure 17. If required
by local authorities, a condensate filter of lime crystals, marble, or
phosphate chips will neutralize slightly acidic condensate (p/n 7450P-
212 available from HTP). Follow all the installation instructions included
with the neutralizer. If a neutralizer is installed, periodic replacement
of the limestone (or neutralizing agent) will be required. The rate of
depletion of the limestone varies with usage of the appliance. During
the first year of appliance operation, check the neutralizer every few
months for depletion.
9. Route the drain line to a nearby floor drain, laundry tub, or
condensate pump. If the appliance condensate outlet is lower than
the drain, you must use a condensate removal pump (kit p/n 554200
available from HTP).
NOTE:
If a nearby laundry tub is used as a disposal for waste water from
the washing machine, draining the condensate into this tub allows the
soapy water discharge to neutralize the acidic condensate.
10. An error will appear on the appliance display if condensate line is
blocked. The appliance will not operate with a blocked condensate
line. It is extremely important to have this condition repaired by a
qualified service technician.
11. Damages due to frozen or blocked condensate lines or leaks ARE
NOT covered by warranty.
