3
Venting
Electrical Connections
External LWCO Connection
(if required by local codes)
Power Connection
120 VAC 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.
Safety
DO NOT
touch the
power
cord with
wet hands.
DO NOT allow
the boiler to be
exposed to
excessive
amounts of
water.
Front Panel Dip Switch 2 (Set of 2)
SW Function
Setting
2
Gas Type
Natural Gas
2-OFF
Propane Gas
2-ON
PCB Dip Switch 2 (Set of 8)
SW Function Setting
1 Temperature
Control
Return Water 1-ON
Supply Water 1-OFF
7 Thermostat
or Zone
Controller
Unused
(Permanent
Space
Heating
Demand)
7-ON
Used
7-OFF
8 Exhaust
Thermostat
Temperature
Limit Unused
(CPVC)
8-ON
Setting (PVC) 8-OFF
Front Panel Dip Switch 1 (Set of 10)
SW Function
Setting
2 Temperature
Unit
°C (Celsius)
2-ON
°F (Fahrenheit) 2-OFF
3 Well Pump
On
3-ON
Off
3-OFF
4 & 5 High Altitude* 0-1,999 ft
(0-609 m)
4-OFF,
5-OFF
2,000-5,399 ft
(610-1,645 m)
4-ON,
5-OFF
5,400-7,699 ft
(1,646-2,346 m)
4-OFF,
5-ON
7,700-10,100 ft
(2,347-3,078 m)
4-ON,
5-ON
* Above 2,000 ft (610 m), the boiler will derate by 4% for
each 1,000 ft (305 m) of altitude gain.
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.
CAUTION
Disconnect the power to
the boiler before installing
any wire connections on
the main PCB.
Confirmation of Panel DIP Switch Settings
Horizontal vent termination
Interior view
Intake Air
Exhaust Gas
Exterior view
12"(300mm)min.
Venting Length
3” pipe venting
2” pipe 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 Schedule 40(Solid core)
•
CPVC Schedule 40 or 80(Solid core)
•
Approved Polypropylene
Canada*
•
Type BH Special Gas Vent Class IIA (PVC)
•
Type BH Special Gas Vent Class IIB (CPVC)
•
Type BH Special Gas Class IIC (Polypropylene)
* 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.
12"
(30
0m
m
)m
in
.
Concentric Vent Termination
Sidewall installation
Vent
Combustion Air
Combustion Air
1" (25mm) min
Maintain 12" min.
clearance above
highest anticipated
snow level or grade.
Roof installation
Vent
Maintain 12" min.
(18" min. for Canada)
clearance above highest
anticipated snow level
maximum of 24" above
roof.
Combustion
Air
Vent
Combustion Air
Maximum number
of elbows: 6
Maximum number
of elbows: 8
2-to-3-inch
reducer
Maximum Length 150'
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
Vertical vent termination
36" (900mm) min.
Exhaust
Intake
12"
(30
0m
m
)m
in
.
12"min. from any
obstruction above,
below, left, or right
12"
(30
0m
m
)m
in
.
Sidewall vent termination
12"
(3
00m
m
) m
in
.
Vent Termination Options
