Lochinvar 000 through 2 - Manual (Page 20)

20
Location of a Sidewall Air Inlet Cap
Installation, location and clearance requirements for the sidewall
air inlet cap in an Intelli-Vent application are the same as the
installation, location and clearance requirements for the sidewall
air inlet cap in the Hor i zon tal Direct Vent section of the venting
instructions.
The sidewall combustion air inlet cap and the rooftop flue gas
outlet are located in different pressure zones in an Intelli-Vent
system.
Combustion air supplied from outdoors must be free of
contaminants (see Com bus tion and Ventilation Air). To pre vent
recirculation of flue products in to the combustion air inlet,
follow all instructions in this section.
Incorrect installation and/or location of the air inlet cap can allow
the discharge of flue products to be drawn into the combustion
process on the heater. This can result in incomplete combustion
and potentially hazardous levels of carbon monoxide in the flue
products. This will cause operational problems with the heater
and possible spillage of flue products that can cause personal
injury, death or prop er ty damage.
HORIZONTAL INTELLI-VENT WITH
VERTICAL COMBUSTION AIR
Intelli-Vent systems are installed with a Category IV flue and a
separate combustion air pipe to the outdoors. The Horizontal
Intelli-Vent system terminates the flue at the sidewall and air inlet
at the rooftop. The flue outlet and combustion air intake
terminate in different pressure zones.
12" MIN.
FIG. 29 Horizontal Intelli-Vent Installation - Rooftop
Combustion Air Inlet
Follow all requirements in the General Category IV Venting
sections for proper installation and of venting flue prod ucts
horizontally to the outdoors. All other general installation
requirements must be followed.
The Intelli-Vent system requires the installation of an additional
pipe to supply combustion air from outdoors directly to the
appliance.
In cold climates, the use of type “B” double wall vent pipe or an
insulated single wall pipe is recommended to prevent moisture in
the cool incoming air from condensing and leaking from the inlet
pipe.
Termination point for the flue products must follow the clearance
requirements in the Horizontal Sidewall Vent Ter mi na tion section
of the Category IV Vent ing.
CAUTION
ƽ
Appliances that are shut down or will not operate may
experience freezing due to convective airflow in the air inlet
pipe connected to the appliance.
The flue and air inlet duct sizes for a Horizontal
Intelli-Vent Installation with Rooftop Combustion Air Inlet are
listed by unit size. The sidewall vent cap must be purchased from
the ap pli ance manufacturer as a vent kit.
TABLE - I
Air Inlet Sidewall
Input Flue Pipe Vent
Btu/hr Size Size Cap Kit
1,500,000
___________
1,700,000
___________
2,000,000
6"
___________
7"
___________
8"
6"
___________
7"*
___________
8"
SVK3026
____________
SVK3027
____________
SVK3028
*Piping from the appliance to the air inlet cap may be either 7" or
8" connecting to an 8" sidewall cap provided in the kit.