Lochinvar EW150 Installation & Service Manual page 18

2
General venting
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.
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 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 for 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 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.
Dryer vent 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.
18
Installation & Service Manual
Sealing of vent material for use with the
Sidewall 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 Vent, 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.
Figure 2-12 Drain Tee Installation
WIRE TIE
3" DIA
CIRCULAR TAP
Drain Tee Installation
A drain tee must be installed in the vent pipe to collect and
dispose of any condensate that may occur in the vent system.
The drain tee must be installed as the first fitting after the
horizontal ell on the top of the appliance. See the typical vent
installation drawings. Plastic drain tubing, sized per the vent
manufacturers instructions, shall be provided as a drain line
from the tee. The drain tubing must have a trap provided by
a 3" (76 mm) diameter circular trap loop in the drain tubing.
Prime the trap loop by pouring a small quantity of water into
the drain hose before assembly to the vent. Secure the trap
loop in position with nylon wire ties. Use caution not to
collapse or restrict the condensate drain line with the nylon
wire ties. The condensate drain must be routed to a suitable
drain for disposal of condensate that may occur in the direct
vent system. Refer to the condensate drain installation
instructions as supplied by the manufacturer of the vent
material. See "Freeze Protection" for more information.
When a direct vent system is disconnected for any reason,
the flue must be reassembled and resealed according to the
vent manufacturers instructions. The air inlet pipe must
also be resealed to ensure that combustion air will be free of
contaminants and supplied in proper volume.
TO SUITABLE DRAIN