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Venting
Terminate the venting system at least 3 feet (0.9m) above any forced air inlet within 10 feet (3.05m).
Terminate the venting system at least 4 feet (1.2m) below, 4 feet (1.2m) beside, or 1 foot (30cm) above any door, window, or gravity
air inlet into any building.
Locate vent termination at least 8 feet (2.4m) horizontally from any combustion air intake located above the sidewall termination
cap.
Units which are shut down or will not operate may experience freezing due to convective air flow in the flue
CAUTION
pipe, through the air inlet, or from negative pressure in the equipment room. In cold climates, operate the
pump continuously to help prevent freezing of unit water. Provide proper freeze protection. See Freeze
Protection, page 44.
Sidewall venting without fan
For Models 400 - 750 which are approved for sidewall venting without an external power vent fan, you must install specific vent
kits and venting materials (reference Table 2C on page 25 for kit numbers).
The following is a detailed explanation of Sidewall Venting Without an External Power Vent Fan installation requirements.
Flue outlet piping
Venting Guidelines
If using this venting option, a sealed AL29-4C venting system for flue products is required on all models of this appliance. This
venting system operates with a positive pressure in the vent. The internal combustion air blower generates this positive pressure
which operates the combustion process and also exhausts the flue products from the building.
This vent system has specific vent material and installation requirements. Only use listed sealed AL29-4C vent system materials.
Follow all installation requirements. See Table 2A for proper pipe size for your unit. A list of sealed AL29-4C flue pipe manufacturers
is located on page 14.
Seal all vent joints and seams gas-tight.
Drain tee installation
A drain tee must be installed in the vent pipe to collect and dispose of any condensate that may occur in the vent system. The drain
tee must be installed as the first fitting after the horizontal ell on the top of the unit (see FIG. 2-9). Plastic drain tubing, sized per
the vent manufacturer's instructions, shall be provided as a drain line from the tee. The drain tubing must have a trap provided by
a 3" (7.6cm) diameter circular trap loop in the drain tubing. Prime the trap loop by pouring a small quantity of water into the drain
hose before assembly to the vent. Secure the trap loop in position with nylon wire ties. Use caution not to collapse or restrict the
condensate drain line with the nylon wire ties. The condensate drain must be routed to a suitable drain for disposal of condensate
that may occur in the direct vent system. Refer to the condensate drain installation instructions as supplied by the manufacturer
of the vent material.
Figure 2-9_Sidewall Vent - Models 400 - 750 (Only)
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