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(s)
with heat tape and secure with ties. Follow the heat tape manufacturer’s installation
recommendations
.
Once condensate drain lines are indoors, a common condensate drain header
(1” diameter) should be used to combine all drain lines only after each drain line
is trapped.
For indoor installations with single vent pipe, run condensate drain from duct
furnace and vent pipe as shown in figures below for vertically vented or
horizontally vented furnaces.
