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VII. Condensate Drains
Condensate is produced in furnace sections during heating operation. Installation requires an
individual
condensate drain system
for each duct furnace section and may be combined to a common condensate drain
line after condensate trap(s). Waterless condensate valve/trap kits are provided with each duct furnace.
The condensate drain system must include a waterless valve/trap for each furnace section for proper system
performance. All joints must be watertight to prevent leakage. Heat exchanger assembly includes a threaded
elbow oriented parallel to cabinet base. A male threaded PVC adapter is included in the waterless trap kit
provided with the furnace to make all necessary waterless valve/trap connections. Glue 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).
For installations where a duct furnace has a horizontal flue gas discharge, a condensate trap must be provided in
line with each exhaust vent. For these applications join all exhaust vent condensate lines after the condensate
trap and follow manufacturer guidelines for disposal.
For outdoor installations run condensate drain from duct furnace into building as shown in Figure 16 for
proper condensate drain connections.
Where condensate drains are located outside a heated space or in a space where temperatures may fall below
freezing,
the drain line must be thermally protected
.
