Page 8 RWB 6104 WMNX
Connect Outside Air Duct
to NX Adapter
The outside air adapter must be installed by strictly
following the kit installation instructions.
DO NOT attempt to install outside air piping without
using the outside air adapter and instructions pro-
vided.
Abundant fresh air is required for proper combus-
tion.
•
•
•
Failure to install adapter properly
could result in impaired combustion,
appliance soot-up, puffback of smoke,
and fi re or asphyxiation hazards.
WARNING
!
Exhaust fans and other air-using devices: Size
air openings large enough to supply all air-using
devices in addition to the minimum size required
for combustion air. If there is any possibility of the
equipment room developing a negative pressure
due to exhaust fans, clothes dryers, etc., either
pipe combustion air directly to the burner or pro-
vide a sealed enclosure for the burner and supply
it with its own combustion air supply.
Safety Shutoff for Direct Vent System
The direct vent blocked fl ue safety shut off sys-
tem, refer to Figure 3, shuts down the burner if
the exhaust fl ue is blocked and/or if the air inlet is
blocked. It recognizes a blocked fl ue by sensing
excessive pressure in the combustion chamber. It
recognizes a blocked inlet by sensing excessive
vacuum in the air inlet adapter.
This system meets the requirements for a blocked
fl ue or blocked combustion air inlet per CSA Stan-
dard B140.0. It is designed to interrupt the cad
cell circuit and allow the control to shut down the
burner.
Direct/Sidewall Venting Application
For direct vent installations, follow instructions
provided with appliance and direct vent system.
Outside combustion air is required for direct vent-
ing.
•
•
Inspect/Prepare Installation Site
Figure 3. Pressure Switch Installation
When installing an NX outside air adapter (Beck-
ett Part Number 52018U), refer to the instruction
sheet supplied with the adapter. This kit allows
combustion air to be piped directly to the burner.
The NX outside air adapter kit may also be used
for chimney vent applications that require outside
combustion air.
Mounting dimensions
When using the Beckett universal adjustable
fl ange, mount the air tube at a 2° downward
pitch unless otherwise specifi ed by the appli-
ance manufacturer.
•
1.
Do not attempt to install outside air piping to the
burner without using the outside air kit and in-
structions.
•
Failure to comply could result in impaired com-
bustion, appliance soot-up, puffback of smoke,
and fi re or asphyxiation hazards.
Follow the Outside Air Kit
Instructions Exactly
WARNING
!
Figure 4. – Mounting Burner in Appliance
SK8745
Tilt down 2
o
If space between burner
air tube and opening
exceeds 1/2 inch, pack
burner opening with ce-
ramic fiber refractory.
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