Lochinvar EW 150, Designer'S Manual

Page: 14 / 28

HORIZONTAL DIRECT VENT
Horizontal direct vent applications require
a vent kit which MUST be supplied by
Lochinvar to guarantee proper operation.
The part number for each kit is listed by unit
size. Each kit includes a sidewall vent cap for
flue products, a firestop, a combustion air inlet
cap and instructions for proper installation.
It is important to be careful in the placement of
the horizontal direct vent caps. Combustion air
supplied from outdoors MUST be free of
contaminants.
To prevent recirculation of flue products into the
combustion air inlet:
The combustion air inlet cap MUST NOT
be installed above the flue outlet cap.
Maintain a minimum 3 foot (0.9 m) radius
clearance between the combustion air inlet
cap and the flue outlet cap.
The combustion air inlet cap and vent cap
for flue outlet MUST be located on the same
sidewall and in the same pressure zone.
DO NOT place the combustion air inlet
cap closer than 10 feet (3.0 m) from an
inside corner of an L-shaped structure.
Place the combustion air inlet cap at least
1 foot (0.3 m) above ground level and
above normal snow levels.
MULTIPLE UNIT APPLICATIONS
Horizontal Direct Vent
The combustion air inlet caps for multiple unit
installations MUST maintain the minimum 3
foot (0.9 m) radius clearance below or
horizontally from the closest flue outlet.
Lochinvar
1 2
L o c h i n v a r
D E S I G N E R
’
S G U I D E E F F I C I E N C Y
+
W A T E R H E A T E R
6 1 5 - 8 8 9 - 8 9 0 0
CAUTION!
Water heaters which
are shut down or will
not operate may
experience freezing due
to convective air flow in
the air inlet pipe
connected to the unit.
Proper freeze
protection MUST be
provided.
(TABLE D)
–
HORIZONTAL DIRECT VENT KITS
MODEL DIRECT VENT AIR INLET HORIZONTAL DIRECT
NUMBER FLUE SIZE* PIPE* VENT KIT
EW 150 4 ” 4 ” HDK3013
EW 200 4
”
4
”
HDK3013
EW 250 5 ” 5 ” HDK3013
EW 300 5
”
5
”
HDK3014
1.
5.
4.
2.
3.
(FIG. 10) HORIZONTAL DIRECT VENT
(FIG. 11) HORIZONTAL DIRECT VENT CAPS
NOTE:
The use of double wall
vent material for the
combustion air inlet pipe
is recommended in cold
climates to prevent the
accumulation of
condensation on the pipe
exterior.
*Minimum diameter, installer may increase diameter one pipe
size for ease of installation if needed.