Allied Air A96US2V Installation Instructions Manual page 35

Condensate Piping
This unit is designed for either right or left side exit of
condensate piping in upflow applications. In horizontal
applications, the condensate trap must extend below the
unit. An 8" service clearance is required for the condensate
trap. Refer to Figure 49 and 51 for condensate trap
locations. Figure 56 shows trap assembly using 1/2" PVC
or 3/4" PVC.
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 condensate trap, filter rack MUST be installed beyond
condensate trap or trap must be relocated to avoid interference.
Figure 49
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. Use a large flat head screw driver or a 1/2" drive socket
extension and remove plug (Figure 49) from the cold
end header box at the appropriate location on the side
of the unit. 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 56.
4. Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in
Figure 56. Route the condensate line to an open drain.
Condensate line must maintain a 1/4" downward slope
from the furnace to the drain.
507404-04
Do not use copper tubing or existing copper condensate
lines for drain line.
5. Figures 51 and 52 show the furnace and evaporator coil
using a separate drain. If necessary the condensate line
from the furnace and evaporator coil can drain together.
See Figure 54 and 55)
Upflow furnace (Figure 50) - In upflow furnace
applications 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 51) - In horizontal furnace
applications the field provided vent must be 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.
NOTE: In horizontal applications it is recommended to
install a secondary drian pan underneath the unit and trap
assembly.
NOTE: Vinyl tubing may be used for condensate drain.
Tubing must be 1-1/4" o.d. X 1" i.d. and should be attached
to the drain on the trap using a hose clamp.
6. If unit will be started immediately upon completion of
installation, prime trap per procedure outlined in Unit
Start-Up section.
Issue 1621
CAUTION
Page 35 of 80