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Exhaustfans andotherair-usingdevices: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 provide 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 flue safety shut off system,
refer to Figure 2, shuts down the burner if the ex-
haust flue is blocked and/or if the air inlet is blocked.
It recognizes
a blocked flue 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
flue 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 burn-
er.
• Direct/Sidewall
Venting
Application
Connect
Outside
Air Duct
to NX Adapter
to
install
adapter
properly
could
result
in impaired
combustion,
appliance
soot=up,
puffback
of smoke,
and fire or asphyxiation
hazards.
•
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.
For direct vent installations, follow instructions pro-
vided with appliance and direct vent system.
Out-
side combustion air is required for direct venting.
Failure
Inspect/Prepare
installation
Site
When installing an NX outside air adapter (Beckett
Part Number 52018U), refer to the instruction sheet
supplied with the adapter. This kit allows combus-
tion air to be piped directly to the burner. The NX
outside air adapter
kit may also be used for chim-
ney vent applications that require outside combus-
tion air.
• Fuel Line installation
CAUTION
Do Not Use Teflon
Tape
Damage
to the pump could
cause
impaired
burn=
er operation,
oil leakage
and appliance
soot=up.
•
Never use Teflon tape on fuel oil fittings.
•
Tape fragments can lodge in fuel line components
and fuel unit, damaging the equipment and pre-
venting proper operation.
•
Use oil-resistant pipe sealant compounds.
Route the fuel line through the opening in the bottom
of the burner cover. Continuous
lengths of heavy
wall copper tubing are recommended. Always use
flare fittings. Never use compression fittings.
Always
install fittings in accessible
locations. To
avoid vibration
noise, fuel lines should not run
against the appliance or ceiling joists.
• Fuel Line Valves
and Filter
To further protect the fuel supply system and reduce noz-
zle orifice plugging with firing rates below 0.75 gph, a dual
filtration system can be installed. This typically consists of
a 50 micron primary filter, located near the fuel tank and a
secondary filter rated for at least 10 microns located near
the burner.
Figure
2. Pressure
Switch
Installation
TUBE,
.25 ID X 15"LONG
=
TRIM
PLATE
Z
MOD. AIR
INLETADAPTER
j
PRESSURE
SENSING
PORT
-PRESSURE
SENSING
TUBE
AIR TUBE
WITH
PRESSURE
PORT
TUBE
PRESSURE
SWITCH
/
CAD
C
CAD CELL LEAD
Page 6
RWB 6104 WMNX
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