Lennox Allied Air A96UHMV Installation Instructions Manual page 23

DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
NOTE: Do not discharge exhaust gases directly into any chimney
or vent stack. If vertical discharge through an existing unused chim-
ney or stack is required, insert piping inside chimney until the pipe
open end is above top of chimney and terminates as illustrated. In
any exterior portion of chimney, the exhaust vent must be insulated.
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 34 for condensate trap locations.
NOTE: If necessary the condensate trap may be installed
up to 5" away using PVC pipe from the furnace. Piping from
furnace must slope down a minimum of 1/4" per ft. toward
trap.
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.
506550-01
Figure 29
Figure 30
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. Remove plug (Figure 30) 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. 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 33.
4. Install drain trap using appropriate PVC fittings, glue all
joints. Glue the provided drain trap as shown in Figure
33. Route the condensate line to an open drain.
Condensate line must maintain a 1/4" downward slope
from the furnace to the drain.
5. Installed field provided vent on trap assembly as shown
in Figures 31 through 34. Vent must extend at least 1"
above the furnace condensate drain connection in upflow
applications and 4-1/2" above the bottom of the cabinet
in horizontal applications.
6. If unit will be started immediately upon completion of
installation, prime trap per procedure outlined in Unit
Start-Up section.
CONDENSATE TRAP LOCATIONS
(Unit shown in upflow position with remote trap)
Condensate line must slope downward away from the trap
to drain. If drain level is above condensate trap, condensate
pump must be used. Condensate drain line should be routed
within the conditioned space to avoid freezing of condensate
and blockage of drain line. If this is not possible, a heat
cable kit may be used on the condensate trap and line.
Heating cable kit is available in various lengths; 6 ft. (1.8 m)
- kit no. 26K68; 24 ft. (7.3 m) - kit no. 26K69; and 50 ft. (15.2
m) - kit no. 26K70.
Do not use copper tubing or existing copper condensate
lines for drain line.
Issue 1230
Figure 31
CAUTION
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