Direct Venting - Lochinvar 399 Installation And Service Manual

Hydronic Heating Boilers and
Domestic Water Heaters
INSTALLATION
FIG. 23A Horizontal DirectAire Installation (Illustration
with Sidewall Venter and Sidewall Combustion Air)
Combustion air supplied from outdoors must be free of
contaminants (see
Vent Kits
You must order the Horizontal DirectAire™ Vent Kit for
sidewall installation from the appliance manufacturer. See
TABLE–F for kit numbers. Each kit includes a sidewall
powered vent cap fan, proving switch, controls, combustion air
inlet cap to supply air to a single unit, the transition adapter to
attach the field supplied single wall air inlet pipe to the unit
and installation instructions. Purchase flue pipe and air inlet
pipe locally.
The sidewall air inlet cap supplied in the Horizontal
DirectAire™ Vent Kit is used to supply combustion air to a
single boiler. Combustion air supply pipes from multiple units
can not be combined into a single air inlet pipe and inlet point.
WARNING: Only use the sidewall air inlet
cap recommended
manufacturer. Using another sidewall air inlet
cap may result in operational problems and the
spillage of flue products. Spillage of flue
products can cause personal injury or death due
to carbon monoxide poisoning.
Venting of Flue Products
For venting flue products horizontally, follow all requirements
in the installation instructions for sidewall venting.
Termination point for the flue products must follow the
clearance requirements in
page 19.
For proper operation, a barometric damper is provided for
TM
Horizontal DirectAire installations. The damper will help to
ensure a draft between negative 0.04 to 0.08 inches w.c.
TABLE–E
Continued
, page 8).
by the appliance
TABLE-F
Horizontal DirectAire™ Kits
Input
Btu/hr
399,999
500,000
650,000
750,000
990,000
1,260,000
1,440,000
1,800,000
2,070,000
*These kits include a sidewall venter assembly, vent termination, DV box
adapter, sidewall air inlet cap, and a barometric damper.

5. Direct Venting

IMPORTANT: Before installing venting system,
follow all venting clearances and requirements
found in the Venting, General Information
section, page 11.
This option uses sealed AL29-4C vent materials for the flue
outlet piping and separate combustion air inlet piping. This
system terminates both the flue and combustion air inlet in the
same pressure zone. The flue outlet and combustion air intake
may terminate at either a sidewall or the rooftop.
To use the optional
specific vent kits and venting materials. The following is a
detailed explanation of
including the components used and vent kit part numbers.
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 blowers generate 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–B,
page 13 for proper pipe size for your unit. A list of sealed
AL29-4C flue pipe manufacturers is located on page 24.
Seal all vent joints and seams gas-tight.
22
Kit*
HDK3031
HDK3031
HDK3032
HDK3032
HDK3026
HDK3027
HDK3027
HDK3028
HDK3028
system, you must install
installation requirements,