34
D-15
Fig. 37: Horizontal Through-the-Wall Venting
D-15
Fig. 38: Alt. Horizontal Through-the-Wall Venting
NOTE:
While a drain connection is required in the
vent of all XTherm installations, the drain can be
ac-complished in several different ways. The figures
in this manual show the drain in a vent tee, however,
this can also be accomplished using an inline collec-
tor for condensing stacks or an inline vertical or
horizontal collector available from several of the
listed vent manufacturers.
D-15
Fig. 39: Horizontal Through-the-Wall Direct Venting
CAUTION:
This venting system requires the
installation of a condensate drain in the vent piping
per the vent manufacturer’s instructions. Failure to
install a condensate drain in the venting system will
void all warranties on this heater.
Installation
These installations utilize the heater-mounted blow-
er to vent the combustion products to the outdoors.
Combustion air is taken from inside the room and the
vent is installed horizontally through the wall to the out-
doors. Adequate combustion and ventilation air must
be supplied to the equipment room in accordance with
the NFGC (U.S.) or B149 (Canada).
The total length of the horizontal through-the-wall flue
system should not exceed the maximum equivalent
ft in length. If horizontal run exceeds the maximum
equivalent ft, an appropriately sized variable-speed
extractor must be used. Each elbow used is equal to
10 ft of straight pipe. This will allow installation in one
of the four following arrangements (example shown for
Model 2505 with 10” vent):
• 100’ of straight flue pipe
• 90’ of straight flue pipe and one elbow
• 80’ of straight flue pipe and two elbows
• 70’ of straight pipe and three elbows
The vent cap is not considered in the overall length of
the venting system.
Horizontal Through-the-Wall Direct
Venting (Category IV)
