Lochinvar EW150 Installation & Service Manual page 14

2
General venting
Air Inlet Pipe Materials
The air inlet pipe(s) must be sealed. Choose acceptable
combustion air inlet pipe materials from those specified in
this section.
Select air inlet pipe material from the following specified
materials:
PVC or CPVC (4", 5" or 6" I.D.)*
Dryer Vent (not recommended for roof top air inlet)
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 materials,
WARNING
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 venting materials will
void the warranty and certification of the
appliance.
The use of double wall vent material
NOTICE
for the combustion air inlet pipe is
recommended in cold climates to prevent
the condensation of airborne moisture in
the incoming combustion air.
Length of Air Inlet Pipe
The total equivalent length of the sidewall or vertical roof
top E+Vent combustion air inlet pipe must not exceed a
maximum of 50 (15.24 m) equivalent feet in length. Subtract
5 feet (1.52 m) for each elbow in the air intake system. Do
not exceed limits for the combustion air inlet piping lengths.
Sealing of Type "B" double wall vent material or galvanized
vent pipe material used for air inlet pipe on a sidewall or
vertical roof top E+Vent Combustion Air Supply 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.
14
Installation & Service Manual
4. Ensure that the air inlet pipes are properly
supported.
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 and the air inlet cap connection.
should use a screw type clamp to seal the vent to the
appliance and air inlet cap. Proper sealing of the air inlet pipe
ensures that combustion air will be free of contaminants and
supplied in proper volume.
When a sidewall or vertical roof top E+Vent combustion air
supply system is disconnected for any reason, the air inlet
pipe must be resealed to ensure that combustion air will be
free of contaminants and supplied in proper volume.
Failure to properly seal all joints and
WARNING
seams as required in the air inlet piping
may result in flue gas recirculation,
spillage of flue products and carbon
monoxide emissions causing severe
personal injury or death.
DO NOT use Radel or cellular (foam) core
CAUTION
PVC or CPVC pipe.
NOTE: In Canada, CPVC and PVC vent pipe, fi ttings and
cement/primer must be ULC-S636 certifi ed.
DO NOT insulate PVC or CPVC
WARNING
venting materials. Use of insulation will
cause increased vent wall temperatures,
which could result in vent pipe failure.
Figure 2-9 Sidewall Air Inlet Cap
Dryer vent