Lochinvar SNA285-125 Manuale Utente

       

Installation & Service Manual

TM

The air inlet pipe(s) must be sealed.  Choose acceptable 
combustion air inlet pipe materials from the following list:
 
 

PVC, CPVC, Polypropylene or ABS 

 

Dryer Vent or Sealed Flexible Duct (not recommended 

 

for rooftop air inlet)

 

Galvanized steel vent pipe with joints and seams sealed as 

 

specified in this section.

 

Type “B” double-wall vent with joints and seams sealed as 

 

specified in this section.

 

AL29-4C, stainless steel material to be sealed to 

 

specification of its manufacturer.

*Plastic pipe may require an adapter (not provided) to 
transition between the air inlet connection on the appliance 
and the plastic air inlet pipe.

 WARNING Using air intake materials other than 

those specified can result in personal 
injury, death or property damage.  

The use of double-wall vent or insulated 
material for the combustion air inlet pipe is 
recommended in cold climates to prevent 
the condensation of airborne moisture in 
the incoming combustion air.

Sealing of Type “B” double-wall vent material or galvanized 
vent pipe material used for air inlet piping on a sidewall or 
vertical rooftop Combustion Air Supply System:

a.  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 silicone sealant such as 

 

those manufactured by Dow Corning or General Electric.

b.  Do not install seams of vent pipe on the bottom of 
 horizontal 

runs.

c.  Secure all joints with a minimum of three (3) sheet metal 
 

screws or pop rivets.  Apply Aluminum Foil Duct Tape or 

 

silicone sealant to all screws or rivets installed in the vent 

 pipe.

d.  Ensure that the air inlet pipes are properly supported.

The PVC, CPVC, or ABS air inlet pipe should be cleaned and 
sealed with the pipe manufacturer’s recommended solvents 
and standard commercial pipe cement for the material used.  
The PVC, CPVC, ABS, Dryer Vent or Flex Duct 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 or flex duct should use a screw type clamp to seal the vent 
to the appliance air inlet and 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.

Follow the polypropylene manufacturer’s instructions when 
using polypropylene material as an inlet pipe.

When a sidewall or vertical rooftop 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.

 DANGER

Failure to properly seal all joints and 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.