Drip Leg Assembly; Proper Horizontal Installation; Raised Platform; Drain Pan - Lennox G21Q3-40 Unit Information

WRONG
L − Horizontal Mounting (Figure 49)
When mounting unit horizontally it must be placed so that
when facing the unit the airflow is from right to left. This
placement is necessary so moisture can drain from the
condensing coil. This must not be changed. If installed in
any other position, such as inverted or on its back, the con
densing coil will fill with condensate and make the unit inop
erable. See figure 49.
M − Support Frame and Suspension Rods
(Figure 49)
A support frame must be used to prevent damage anytime
a unit is to be suspended. A support frame kit is available
from Lennox.
N − Raised Platform
When installed in a crawlspace or on attic beams it is impor
tant that the unit be supported by a flat base to prevent
damage (sagging) to unit.
O − Combustible Floor Additive Base
A combustible floor additive base (figure) must be used when
the unit is installed on a combustible floor (downflow installa
tions). It is available from Lennox Repair Parts.
P − Drain Pan
A drain pan should be used in all applications where surround
ing structures, such as walls or ceilings, might be damaged by
potential condensate leakage. If an evaporator coil is used, the
drain pan should be extended under the coil to catch potential
condensate leakage.
In any installation where the unit is mounted horizontally
a drain pan can be used to catch potential condensate
leakage.
Q − Drip Leg Assembly (G21 only)
(Figures 50 and 51)
A drip leg must be used to remove condensate and exhaust
from the unit. A drip leg assembly may be used on the G21
only. If unit condensate line is clogged or obstructed, ex
cess water may shut down the unit. G21 drip leg assem
blies may contain a threaded pipe plug or a removable rub
ber boot with clamp, for cleanout of debris in drip leg.
PROPER HORIZONTAL
INSTALLATION
FIGURE 49
EXHAUST PIPING
(Field−provided)
STAND PIPE
(Must be left open.)
CONDENSATE
CONNECTION
(Rotate to proper
drain position before
cementing.)
RUBBER BOOT
WITH HOSE CLAMP
(Loosen clamp and remove
to facilitate cleanout)
EXHAUST PIPING
(Field−provided)
STAND PIPE
(Must be left open.)
CONDENSATE
CONNECTION
(Rotate to proper
drain position before
cementing.)
THREADED PIPE PLUG
(Apply teflon tape to
threads before screwing
plug into adapter.)
R − Ball Float Condensate Trap Assembly
(G21/GSR21)Figures 52, 53 and 54
A ball float condensate trap must be used on GSR21 and
may be used on G21 units. It was designed to save room in
GSR21 horizontal installations. The float trap serves a dual
purpose. It is a means of removing condensate and ex
haust from the unit.
Page 41
RIGHT

DRIP LEG ASSEMBLY

DRIP LEG
ASSEMBLY TEE
COMPRESSION
(Factory Installed)
PVC PIPE
(Cut to correct
length for exit
from unit.)
FIGURE 50
DRIP LEG ASSEMBLY
DRIP LEG
ASSEMBLY TEE
COMPRESSION
(Factory Installed)
PVC PIPE
(Cut to correct
length for exit
from unit.)
FEMALE ADAPTER
FIGURE 51
ELBOW
ELBOW