Lochinvar EW150 Installation & Service Manual page 22

2
General venting
Air Inlet Pipe Materials
Select air inlet pipe material from the following specified
materials:
PVC or CPVC (4", 5" or 6" I.D.)*
Dryer Vent
Galvanized steel vent pipe with joints and seams
sealed as specified below.
Type "B" double wall vent with joints and seams
sealed as specified below.
* Plastic pipe requires an adapter (not provided) to
transition between the air inlet and cap.
Using other vent or air intake
WARNING
materials, failure to properly seal all
seams and joints or failure to follow
vent pipe manufacturer's instructions
can result in personal injury, death
or property damage. Mixing of vent
materials will void the warranty and
certification of the appliance.
Length of Flue Pipe and Air Inlet Pipe
The total equivalent length of the direct vent flue pipe
or the air inlet pipe must not exceed a maximum of 50
(15.24 m) equivalent feet in length or each pipe. Subtract
5 feet (1.52 m) for each elbow in the vent pipe or air intake
system. Do not exceed limits for piping lengths.
Sealing of Type "B" double wall vent material or
galvanized vent pipe material used for air inlet pipe on
a Direct Vent System
1. Seal all joints and seams of the air inlet pipe
using either Aluminum Foil Duct Tape meeting UL
Standard 723 or 181A-P or a high quality UL
Listed silicon sealant such as those manufactured
by Dow Corning or General Electric.
2. Do not install seams of vent pipe on the bottom of
horizontal runs.
3. Secure all joints with a minimum of three sheet
metal screws or pop rivets. Apply aluminum foil
duct tape or silicone sealant to all screws or rivets
installed in the vent pipe.
4. Ensure that the vent pipe and air inlet pipes are
properly supported.
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Installation & Service Manual
The PVC or CPVC air inlet pipe should be cleaned and
sealed with the pipe manufacturers recommended solvents and
standard commercial pipe cement for the material used. The
PVC, CPVC, or Dryer Vent air inlet pipe should use a silicone
sealant to ensure a proper seal at the appliance connection.
Dryer vent should use a screw type clamp to seal the vent to
the appliance and the assembly of 90° ells which make up the
air inlet cap. Proper sealing of the air inlet pipe ensures that
combustion air will be free of contaminants and supplied in
proper volume.
Sealing of vent material for use with the
Vertical Direct Vent System
The vent materials, Heat-Fab Saf-T CI Vent, Z-Flex
Z-Vent, Protech Systems Fas-N-Seal Vent, Flex-L Star-34,
Metal-Fab Corr/Guard Vent or listed AL29-4C vent system
suitable for positive pressure, must be installed and sealed per
the vent manufacturers installation instructions.
Venting of Flue Products
Locate appliances as close as possible to the vertical through-
roof vent for flue products.
Horizontal runs must slope upwards not less than 1/4 inch
per foot (21 mm per meter) from the appliance to the vent
terminal. Follow manufacturers instructions.
The vertical through-roof vent cap shall terminate at least
3 feet (91 cm) above any forced air inlet within 10 feet
(3.05 m).
The vertical through-roof vent shall terminate at least 4 feet
(1.22 m) below, 4 feet (1.22 m) horizontally from or 1 foot
(30 cm) above any door, window or gravity air inlet to the
building.
The vent terminal shall not be installed closer than 10 feet
(3.05 m) from an inside corner of an L-shaped structure.
Flue gas condensate can freeze on exterior walls or on the
vent cap. Frozen condensate on the vent cap can result in a
blocked flue condition. Some discoloration to exterior building
surfaces can be expected. Adjacent brick or masonry surfaces
should be protected with a rust resistant sheet metal plate.
The vertical through-roof vent cap should have a minimum
clearance of 4 feet (1.22 m) horizontally from and in no case
above or below, unless a 4 foot (1.22 m) horizontal distance
is maintained from electric meters, gas meters, regulators and
relief equipment.