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4. Do not install exhaust vent where flue
products can be drawn into adjacent building
openings such as windows, doors, or fresh air
intakes. Location should minimize the
number of elbows or turns in vent pipe.
5. Do not install unit where it may exposed to
potentially explosive or flammable vapors.
6. Do not locate unit in areas where corrosive
vapors (such as chlorinated, halogenated, or
acidic) are present in the atmosphere or can
be mixed with combustion air entering
heater.
Condensate Drain Piping
Unit may be equipped with a high efficiency
gas heater which requires a condensate drain
system.
The condensate drain system includes a
factory installed condensate trap for proper
system performance. The ¾” PVC
condensate connection is located on the front
of the unit. See Figure 5 for unit orientation.
Figure 29 - Gas Heat Condensate Trap
All connecting joints must be watertight to
prevent leakage. Glue the necessary PVC
pipe and fittings to connect condensate
piping to a suitable drain. Be sure to apply
sealant to threads to prevent leakage.
Installation of a union ahead of the trap is
preferred to permit maintenance of drains and
accommodate servicing of the heater.
Never connect condensate drain directly
into a sewer line. If connection to a sewer is
permitted by code, drain line must terminate
in an open sewer tap (separated by an air
gap).
Where condensate drains are located outside
a heated space or in a space where
temperatures may fall below freezing, the
drain line must be freeze protected.
The drains must be extended through the
heater base and into the heated space below
to prevent freezing of condensate in the drain
piping. Trap must be located in a heated
space or protected to avoid freezing.
Where condensate drains are located outside
a heated space or in a space where
temperatures may fall below freezing, the
drain line must be protected. Use a 2.5 to 5
watt per foot (0.003 to 0.005 kW per meter)
at 115 VAC, 40 °F (4.4 °C) self-regulating,
shielded and waterproof heat tape. Wrap the
drain trap and drain line with heat tape and
secure with ties.
For installations where the building drain
lines are above the level of the furnace drain
system, a condensate pump is required.
Condensate Neutralization
Some municipalities require that the acidic
condensate produced be neutralized before
being discharged into a sewer or drain.
A field provided and installed condensate
neutralizer kit may be necessary. Where
condensate drains and/or neutralization kit(s)
are located outside a heated space or in a
space where temperatures may fall below
freezing, all components and drain lines must
be freeze protected.
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