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FIGURE 42
G26 −3 THROUGH −6 MODEL CONDENSATE
REMOVAL PROCESS
2
1
FLUE TRAP
COLD
HEADER
BOX
FLUE
DRAIN
HOSE
HEADER BOX
CONDENSATE TRAP
4
3
5
6
7
VENT
COMBUSTION
AIR BLOWER
Condensate Removal Process:
1− Condensate mixed with flue products
exits the coil and enters the cold head-
er box.
2− Condensate and flue products are sepa-
rated. Flue products are drawn into the
combustion air blower while condensate
is drained into the header box conden-
sate trap.
3− Flue products are expelled into the flue.
As flue products travel up and out, they
cool and more condensate is produced.
4− Condensate travels down the walls of
the flue pipe and into drain hose.
5− Water drains down through the flue
drain hose and is emptied into the
header box condensate trap.
6− When the cold header box condensate
trap is full, water begins draining out the
condensate drain pipe.
7− An external condensate trap is not re-
quired, but a vent is required. The vent
must extend above the height of the con-
denser coil (approx. 1 inch above the top
of the cold header box).
DETAIL OF COLD HEADER CONDENSATE TRAP
COLD HEADER BOX
HOSE BARB
RUBBER BOOT OR CAP
1/2"MPT PLUG
1/2"MPT TO FEMALE
PVC PIPE ADAPTER
1/2"PVC
1
COIL OPENING BEHIND
COLD HEADER BOX
2
DETAIL OF
FLUE TRAP
HOSE BARB
6
5
CONDENSATE
FROM COIL
1
4
FLUE DRAIN HOSE
SIDE DETAIL OF
HEADER BOX
CONDENSATION
TRAP
FRONT DETAIL OF
HEADER BOX
CONDENSATION
TRAP
6 − Connect condensate drain line (1/2" [13mm] SDR 11
plastic pipe or tubing) to condensate connection on
drip leg assembly and route to open drain. Conden-
sate line must be sloped downward away from drip
leg to drain. If drain level is above drip leg, conden-
sate pump must be used to condensate line. Conden-
sate 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 drip leg and line. Heating
cable kit is available from Lennox in various lengths;
6ft. (1.8m) − kit no. 18K48; 24ft. (7.3m) − kit no. 18K49;
and 50ft. (15.2m) − kit no. 18K50.
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