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Venting
>
Electrical Connections/High Altitude DIP Switch Settings
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Vent Termination Options
Horizontal vent termination
Interior view
Intake Air
Exhaust Gas
12" (300 mm) min.
12" (300 mm) min.
Exterior view
Exhaust Gas
Intake Air
Vertical vent termination
Sidewall vent termination
36” (900 mm) min.
12”
(300 mm) min.
12” (300 mm)
min.
Exhaust Gas
12” (300 mm) min
From any
obstruction
(above, below,
left, or right)
Intake Air
12" (300mm) min.*
Concentric Vent Termination
Sidewall installation
Combusion Air Intake
Combusion Air Intake
1" (25mm) min.
Exhaust
Gas
Maintain 12”
(300 mm) min.
clearance above
highest anticipated
snow level or grade,
whichever is greater.
Exhaust Gas
Roof installation
Exhaust Gas
Exhaust Gas
Combusion Air Intake
Maintain 12” (300mm) min. clearance above highest
anticipated snow level or grade, whichever is greater
(maximum of 24” above roof ).
Combusion
Air Intake
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 65'
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90˚ elbow = 5 linear feet of venting
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45˚ elbow= 3 linear feet of venting
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90˚ elbow = 8 linear feet of venting
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45˚ elbow= 4 linear feet of venting
Exhaust Vent Piping Materials
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All Navien boilers are Category IV appliances.
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The venting system should be approved for use with Category IV appliances (typically Type BH
Special Gas Vent approved by UL 1738-S636).
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Venting requirements in the USA and Canada are different (see below).
Navien recommended venting materials
Locale
Recommended Vent Materials
USA
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PVC/CPVC Schedule 40 or 80 (Solid Core)
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UL1738 approved PVC or CPVC
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Approved Polypropylene (PP)
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Approved Stainless Steel (SS)
Canada*
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Type BH Special Gas Vent Class IIA (PVC)
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Type BH Special Gas Vent Class IIB (CPVC)
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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
1(
&
76B=21(
5
:
&
76B=21(
5
:
&
$&91
$&9/
O/:&2
5
:
&
76B5HFLU
&20
12
1&
=21(B99
&20
12
1&
=21(B99
Neutral
Live
Live
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 (Set of 6 Switches)
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
5 & 6 Model Setting
NFC-250/200H
5-OFF, 6-OFF
NFC-250/175H
5-ON, 6-OFF
DIP Switch 2 (Set of 8 Switches)
SW
Function
Setting
Comment
1
Gas Type
Natural Gas
1-OFF
Refer to
Table 1
on page
130 in the
Installation
&
Operation
Manual.
Propane Gas
1-ON
2 & 3
High
Altitude
0-1,999 ft
(0-609 m)
2-OFF,
3-OFF
2,000-5,399 ft
(610-1,645 m)
2-ON,
3-OFF
5,400-7,699 ft
(1,646-2,346 m)
2-OFF,
3-ON
7,700-10,100 ft
(2,347-3,078 m)
2-ON,
3-ON
SW
Function
Setting
Comment
4
Well Pump
Used
4-ON -
Unused
4-OFF -
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
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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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This unit may be installed at
elevations up to 10,100 ft (3,078 m)
for use with natural gas and
propane. To use the unit at a specific
altitude, the DIP switches should be
set as described above.
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High Altitude: Above 2,000 ft (610 m),
the unit will de-rate by 3% for each
1,000 ft (305 m) of altitude gain.
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For NG, if you install the unit at
above 5,400 ft (1,646 m), it is
required to change the Gas Orifice
for high altitude. Be careful not to
confuse it with the LP Gas Orifice.
For detail, refer to page 129 in the
Installation & Operation Manual.
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Common vent installations for use
with natural gas and propane are
only approved for up to 4,500 ft.