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Venting
Vent Termination Options
Horizontal vent termination
Interior view
Intake Air
Exhaust Gas
Vertical vent termination
12" min. from any
obstruction above,
36" (900 mm) min.
below, left, or right
Venting Length
4" pipe venting
Maximum Length 150'
7
3
3-to-4 inch
2
1
Maximum number
of elbows: 8
· 90˚ elbow = 5 linear feet of venting
· 45˚ elbow = 3 linear feet of venting
Exhaust Vent Piping Materials
· All Navien boilers are Category IV appliances.
· The venting system should be approved for use with Category IV appliances (typically Type BH
Special Gas Vent approved by UL 1738-S636).
· Venting requirements in the USA and Canada are different (see below).
Electrical Connections
External LWCO Connection
(if required by local codes)
(-)
(+)
LWCO
LINE
LINE
3.LWCO
2.AC24VL
1.AC24VN
Neutral
W
C
R
W
C
R
W
C
Refer to your local codes to determine if an
LWCO device is required for your system and
ensure that the built-in device meets the
requirements.
Safety
CAUTION
Disconnect the power to
the boiler before installing
any wire connections on
the main PCB.
Exterior view
in .
m ) m
0 0 m
1 2 " (3
Sidewall vent termination
3" pipe venting
8
6
Maximum Length 60'
5
4
3
2
1
Maximum number
of elbows: 6
· 90˚ elbow = 5 linear feet of venting
· 45˚ elbow = 3 linear feet of venting
Power Connection
120 V AC 60 Hz
Min. 2 Amp current with proper
grounding
CAUTION
Using abnormally high or low AC
voltage may cause abnormal operation,
thereby causing fire which reduces the
life expectancy of this product.
DO NOT touch
DO NOT allow
the power
the boiler to be
cord with wet
exposed to
hands.
excessive
amounts of
water.
Concentric Vent Termination
Sidewall installation
Combustion Air
Vent
Roof installation
Vent
Combustion
Air
Maintain 12" min.
(18" min. for Canada)
clearance above
highest anticipated
snow level maximum
of 24" above roof.
Combustion Air
Vent
Navien recommended venting materials
Locale
Recommended Vent Materials
· PVC/CPVC Schedule 40 or 80 (Solid Core)
USA
· Approved Polypropylene (PP)**
· Approved Stainless Steel (SS)***
· Type BH Special Gas Vent Class IIA (PVC)
Canada*
· Type BH Special Gas Vent Class IIB (CPVC)
· Type BH Special Gas Vent Class IIC (Polypropylene/Stainless Steel)
* For installation in Canada, field-supplied plastic vent piping must comply with CAN/CGA B149.1 (latest
edition) and be certified to the Standard. For Type BH Gas Venting Systems, ULC-S636. Components of this
listed system must not be interchanged with other vent systems or unlisted pipes or fittings. All plastic
components and specified primers and glues of the certified vent system must be from a single system
manufacturer and must not be intermixed with another system manufacturer's parts.
The supplied vent connector and vent termination are certified as part of the boiler.
** Approved Polypropylene Systems include:
Duravent PolyPro® SW (Rigid): 3PPS-xxx (3") or 4PPS-xxx(4")
Duravent PolyPro® (Flexible): 3PPS-FLEXxx (3"), 3PPS-FAM (3" Rigid-to-Flex Male Adapter)
Centrotherm Innoflue® SW (Rigid): ISxx03xx (3") or ISxx04xx (4")
Hart & Cooley Polyflue™ SW (Rigid): 3PF-xx (3") or 4PF-xx (4")
Z-Flex Z-DENS SW (Rigid): 2ZDP_(3" or 4")
*** Approved Stainless Steel Systems include:
Duravent FasNSeal® (Rigid): FSA-PVC3 or FSA-PVC4 (3" or 4" PVC to FasN Seal Appliance Adapter),
FSxxxxx03 or FSxxxxx04 (3" or 4")
Heat Fab Saf-T Vent® EZ Seal: 9301PVC or 9401PVC (3" or 4" PVC/CPVC Outlet Boiler Adapter),
93xx or 94xx (3" or 4")
Confirmation of DIP Switch Settings
DIP Switch 1 (6 switch unit)
SW
Function
Setting
1-OFF,
Normal Operation
2-OFF
1-ON,
2Step MAX
2-OFF
Operation
1 & 2
Status
1-OFF,
1Step MIN
2-ON
1-ON,
1Step MAX
2-ON
3
Combustion Air
Maintain 12" min.
clearance above
highest anticipated
1" (25mm) min
snow level or grade.
DIP Switch 2 (8 switch unit)
SW
Function
Setting
Natural Gas
1-OFF
1
Gas Type
Propane Gas
1-ON
0-1,999 ft
2-OFF,
(0-609 m)
3-OFF
2,000-5,399 ft
2-ON,
(610-1,645 m)
3-OFF
High
2 & 3
Altitude
5,400-7,699 ft
2-OFF,
(1,646-2,346 m)
3-ON
7,700-10,100 ft
2-ON,
(2,347-3,078 m)
3-ON
4
Reserved
-
-
5-OFF,
5 & 6 Country
US/Canada
6-OFF
Space
Used
7-OFF
7
Heating
Unused
7-ON
Thermostat
Exhaust
Used
8-OFF
8
Temperature
Unused
8-ON
Control
Note
When PCB DIP switch 2 #8 is set to
On, ensure that CPVC, polypropylene,
or stainless steel is used for exhaust
venting.
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