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The drains must be extended through the heater base and into the heated space below to prevent
freezing of condensate in the drain piping. Waterless valve/trap must be located in a heated space or
protected to avoid freezing. Locate Waterless Trap as close to duct furnace as possible.
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
o
F (4.4
o
C) self-regulating, shielded and waterproof heat tape. Wrap the drain trap and drain line with
heat tape and secure with ties. Follow the heat tape manufacturer’s installation recommendations.
Figure 17 - Common Condensate Manifold
Condensate drain lines may be connected to a common drain pipe. (Each individual drain line
must be trapped
before connected to the common condensate manifold.)
The supplied waterless trap kits should be installed in the correct orientation (see manufacturers recommendations).
For indoor installations with single vent pipe, run condensate drain from duct furnace and vent pipe as
shown in Figure 18 for vertically vented furnaces or Figure 19 for horizontally vented furnaces.
