3
Venting
>
Electrical Connections
>
Vent Termination Options
Horizontal vent termination
12" (300 mm) min.
12" (3
00 mm
) min.
Interior view
Intake Air
Exhaust Gas
12" (300 mm) min.
12" (3
00 mm
) min.
Exterior view
Vertical vent termination
Sidewall vent termination
12"min. from any
obstruction above,
below, left, or right
12" (300 mm) min.
12" (300 mm) min.
36" (900 mm) min.
12" (300 mm) min.
Concentric Vent Termination
Sidewall installation
Combustion Air
Combustion Air
1" (25mm) min.
Maintain 12" (300
mm) min. clearance
above highest
anticipated snow
level or grade,
whichever is greater
Vent
Roof installation
Vent
Vent
Combustion Air
Maintain 12” (300mm) min.
clearance above highest
anticipated snow level or
grade, whichever is greater
(maximum of 24” above roof)
Combustion
Air
Venting Length
3” pipe venting
2” pipe venting
8
1
3
7
2
Maximum Length 150'
Maximum number
of elbows: 8
2-to-3-inch
6
1
3
4
5
2
Maximum number
of elbows: 6
Maximum Length 60'
·
90˚ elbow = 5 linear feet of venting
·
45˚ elbow= 3 linear feet of venting
·
90˚ elbow = 8 linear feet of venting
·
45˚ elbow= 4 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).
Navien recommended venting materials
Locale
Recommended Vent Materials
USA
·
PVC/CPVC Schedule 40 or 80 (Solid Core)
·
Approved Polypropylene (PP)
·
Approved Stainless Steel (SS)
Canada*
·
Type BH Special Gas Vent Class IIA (PVC)
·
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.
External LWCO Connection
(if required by local codes)
Power Connection
COM
NO
NC
ZONE1
COM
NO
NC
ZONE2
COM
NO
NC
ZONE3
AC24VN
AC24VL
LWCO
R
W
C
R
W
C
W
C
Neutral
Line
Line
LWCO
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.
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.
CAUTION
Disconnect the power to
the boiler before installing
any wire connections on
the main PCB.
Safety
DO NOT touch
the power
cord with wet
hands.
DO NOT allow
the boiler to be
exposed to
excessive
amounts of
water.
Confirmation of DIP Switch Settings
DIP Switch 1 (6 switch unit)
DIP Switch 2 (8 switch unit)
SW
Function
Setting
1 & 2 Operation
Status
Normal Operation 1-OFF,
2-OFF
2-stage MAX
1-ON,
2-OFF
1-stage MIN
1-OFF,
2-ON
1-stage MAX
1-ON,
2-ON
SW
Function
Setting
1
Gas Type
Natural Gas
Propane Gas
1-OFF
1-ON
2
Reserved
-
-
3
Reserved
-
-
4
Reserved
-
-
5 & 6 Country
US/Canada
5-OFF,
6-OFF
7
Space
Heating
Thermostat
Used
7-OFF
Unused
7-ON
8
Exhaust
Temperature
Control
Used
8-OFF
Unused
8-ON
Note
When PCB DIP switch 2 #8 is set to
On, ensure that CPVC or
polypropylene piping is used for
exhaust venting.
