Page 59
Condensate Piping
This unit is designed for either right‐ or left‐side exit of con
densate piping in upflow applications. In horizontal applica
tions, the condensate trap must extend below the unit. An 8”
service clearance is required for the condensate trap. Refer
to figures 40 and 42 for condensate trap locations. Figure 48
shows trap assembly.
NOTE - If necessary the condensate trap may be installed
up to 5’ away from the furnace. Use PVC pipe to connect
trap to furnace condensate outlet. Piping from furnace must
slope down a minimum of 1/4” per ft. toward trap.
1 - Determine which side condensate piping will exit the
unit, location of trap, field-provided fittings and length of
PVC pipe required to reach available drain.
2 - For furnaces with a 1/2” drain connection use a 3/8 allen
wrench and remove plug (figure 40) from the cold end
header box at the appropriate location on the side of the
unit. Install field-provided 1/2 NPT male fitting into cold
end header box. For furnaces with a 3/4” drain connec
tion use a large flat head screw driver or a 1/2” drive
socket extension and remove plug. Install provided 3/4
NPT street elbow fitting into cold end header box. Use
Teflon tape or appropriate pipe dope
3 - Install the cap over the clean out opening at the base of
the trap. Secure with clamp. See figure 48.
4 - Install drain trap using appropriate PVC fittings, glue all
joints. Glue the provided drain trap as shown in figure
48. Route the condensate line to an open drain. Con
densate line must maintain a 1/4” downward slope
from the furnace to the drain.
5 - Figures 44 and 45 show the furnace and evaporator
coil using a separate drain. If necessary the condensa
te line from the furnace and evaporator coil can drain
together. See figures 43, 46 and 47.
Upflow furnace (figure 46) - In upflow furnace applica
tions the field provided vent must be a minimum 1” to a
maximum 2” length above the condensate drain outlet
connection. Any length above 2” may result in a
flooded heat exchanger if the combined primary drain
line were to become restricted.
Horizontal furnace (figure 47) - In horizontal furnace
applications the field provided vent must be a minimum
4” to a maximum 5” length above the condensate drain
outlet connection. Any length above 5” may result in a
flooded heat exchanger if the combined primary drain
line were to become restricted.
FIGURE 40
CONDENSATE TRAP AND PLUG LOCATIONS
(Unit shown in upflow position)
NOTE - In upflow applications where side return
air filter is installed on same side as the conden
sate trap, filter rack must be installed beyond
condensate trap or trap must be re-located to
avoid interference.
Plug
(same on left side)
1-1/2 in.
NOTE - In horizontal applications it is recommended to
install a secondary drain pan underneath the unit and
trap assembly.
NOTE - Appropriately sized tubing and barbed fitting
may be used for condensate drain. Attach to the drain
on the trap using a hose clamp. See figure 41.
FIGURE 41
Tubing
Hose Clamp
Barbed Fitting
Field Provided Drain Components
Elbow
6 - If unit will be started immediately upon completion of
installation, prime trap per procedure outlined in Unit
Start-Up section.
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