Lennox SIGNATURE SLP99UH090XV48C User Manual

Page 26
DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
NOTE - Do
tical discharge through an existing unused chimney or stack is required, insert piping
inside
trated. In any exterior portion of chimney, the exhaust vent must be insulated.
8” - 12”
(203mm - 305mm)
3” - 8”
(76mm-
203mm)
3” - 8”
(76mm-
203mm)
STRAIGHT-CUT OR
ANGLE-CUT IN DIRECTION
OF ROOF SLOPE *
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
ALTERNATE
INTAKE PIPE
INTAKE PIPE
INSULATION (optional)
EXTERIOR
PORTION OF
CHIMNEY
INSULATE
TO FORM
SEAL
SHEET
METAL TOP
PLATE
Minimum 12” (305MM)
above chimney top
plate or average snow
accumulation
FIGURE 38
Condensate Piping
This unit is designed for either right- or left-side exit of
condensate piping in upow applications. In horizontal
applications, the condensate trap must extend below the
unit. An 8” service clearance is required for the conden-
sate trap. Refer to FIGURE 39 and FIGURE 41 for con-
densate trap locations. Figure 39 shows trap assembly
using 1/2” PVC or 3/4” PVC.
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, eld-provided ttings and
length of PVC pipe required to reach available drain.
2 - Use a large at head screw driver or a 1/2” drive
socket extension and remove plug (gure 31) from
the cold end header box at the appropriate location
on the side of the unit. Install provided 3/4 NPT
street elbow tting into cold end header box. Use
Teon tape or appropriate pipe dope.
NOTE - Cold end header box drain plugs are factory
installed. Check the unused plug for tightness to
prevent leakage.
3 - Install the cap over the clean out opening at the
base of the trap. Secure with clamp. See gure 39.
4 - Install drain trap using appropriate PVC ttings,
glue all joints. Glue the provided drain trap as
shown in FIGURE 47. Route the condensate line
to an open drain. Condensate line must maintain a
1/4” downward slope from the furnace to the drain.
CONDENSATE TRAP AND PLUG LOCATIONS
(Unit shown in upflow position)
NOTE - In upflow applications where side return
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.
FIGURE 39
5 - FIGURE 42 and FIGURE 44 shows 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 43, FIGURE
45 and FIGURE 46. Upow furnace (FIGURE 45)
- In upow furnace applications the eld 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 ooded heat
exchanger if the combined primary drain line
were to become restricted. Horizontal furnace
(FIGURE 46) - In horizontal furnace applications
the eld 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 ooded heat exchanger if the combined primary
drain line were to become restricted.
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 tting
may be used for condensate drain. Attach to the
drain on the trap using a hose clamp. See FIGURE
40.

Lennox SIGNATURE SLP99UH090XV48C Specifications

General

Brand	Lennox
Model	SIGNATURE SLP99UH090XV48C
Category	Furnace
Language	English