Lennox SLP98DFV Installation Instructions Manual page 27

6 - If unit will be started immediately upon completion
of installation, prime trap per procedure outlined in
Unit Start-Up section.
Condensate line must slope downward away from the trap
to drain. If drain level is above condensate trap, conden-
sate 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 possi-
ble, a heat cable kit may be used on the condensate trap
and line. Heat cable kit is available from Lennox in various
lengths; 6 ft. (1.8m) - kit no. 26K68 and 24 ft. (7.3m) - kit
no. 26K69.
CONDENSATE TRAP LOCATION
(shown with right side exit of condensation)
Trap can be installed a maximum
of 5ft. from furnace (*PVC only)
Field Provided Vent
1" min. 2" max. above
condensate drain.
1" min.
2" max .
*Piping from furnace must slope down a
minimum 1/4" per ft. toward trap
FIGURE 36
Furnace with Evaporator Coil
Using a Separate Drain
Field Provided Vent
1" min. 2" max. above
condensate drain.
Condensate
Drain Connection
Evaporator Drain Line
(vent required)
FIGURE 37
5' max.
to drain
When combining the furnace and evaporator coil
drains together, the A/C condensate drain outlet
must be vented to relieve pressure in order for the
furnace pressure switch to operate properly.
Furnace with Evaporator
Coil Using a Common Drain
Field Provided Vent
1" min. 2" max. above
condensate drain.
Condensate
Drain Connection
Evaporator Drain Line
(vent required)
Condensate Trap With Optional Overflow Switch
From Evaporator Coil
Drain
Do not use copper tubing or existing copper
condensate lines for drain line.
Page 27
IMPORTANT
FIGURE 38
HorizontalFurnace4" Min. to 5" Max.above
condensatedrain connection)
FurnaceCondensate
DrainConnection
Optional
FIGURE 39
CAUTION