14
L o c h i n v a r
D E S I G N E R
’
S
G U I D E
C O P P E R
-
F I N
I I
W A T E R
H E A T E R
6 1 5 - 8 8 9 - 8 9 0 0
The combustion air inlet cap
must
not be
installed closer than 10 feet (3.05m) from an
inside corner of an L-shaped structure.
The vertical air inlet point for the combustion
air inlet cap
must
be installed at least one
foot (0.30m) above the rooftop and above
normal snow levels. Lochinvar is required to
supply a vent kit for DirectAire applications.
Each kit includes either a sidewall or roof top
combustion air inlet cap to supply air to a
single water heater (See Table F, Page 14).
Aire-Lock
TM
Direct Vent
This vent system utilizes the internal blower of
the unit to draw all combustion air from
outside and vent the by-products of
combustion to the outdoors. This vent system
requires the installation of two vent pipes
directly to the unit, one pipe for flue products
and one pipe for combustion air. Both vent
pipes can terminate horizontally at a sidewall
or vertically at the rooftop. It is a requirement
that both vent pipes terminate in the same
pressure zone. The vent system has specific
vent material and installation requirements.
The vent piping for flue products uses AL29-
4C vent material and must be sealed “gas-
tight” at all vent joints. The vent connection is
made directly to the top of the unit. The
maximum distance for the flue pipe is 50
equivalent feet (15.2m). Subtract 5 feet
(1.52m) for each elbow in the flue pipe.
The flue products vent pipe is a dedicated
system with one flue pipe per unit.
The combustion air supply pipe connects
directly to the unit to supply combustion air.
The maximum distance for the air inlet pipe is
50 equivalent feet (15.2m). Subtract 5 feet
(1.52m) for each elbow in the air inlet pipe.
Lochinvar
(TABLE F)
DIRECTAIRE VERTICAL SIDEWALL & ROOFTOP AIR INLET KITS
MODEL NUMBER
VENT SIZE
AIR INLET
SIDEWALL AIR
ROOFTOP AIR
SIZE*
INLET KIT
INLET KIT
CF401
6
”
6
”
SVK3047
VDK3026
CF501
6
”
6
”
SVK3047
VDK3026
CF651
8
”
8
”
SVK3048
VDK3027
CF751
8
”
8
”
SVK3048
VDK3027
CF991
10
”
10
”
SVK3040
VDK3023
CF1261
12
”
12
”
SVK3041
VDK3024
CF1441
12
”
12
”
SVK3041
VDK3024
CF1801
14
”
12
”
SVK3041
VDK3024
CF2071
14
”
12”
SVK3041
VDK3024
(FIG. 14) AIRE-LOCK DIRECT VENT
