3
Venting
Electrical
C
onnections
External LW
C
O
C
onnection
(
if required by local codes
)
Power
C
onnection
1
20
VA
C
6
0
Hz
Min.
2
Amp current with proper
grounding
C
AUTIO
N
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
P
CB
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 1
0)
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.
C
AUTIO
N
Disconnect the power to
the boiler before installing
any wire connections on
the main PCB.
C
onfirmation 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
12"(
30
0mm)
m
in.
C
oncentric 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
Sidewall vent termination
Vent Termination Options
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
ent (see below).
N
avien 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)
* Approved polypropylene systems include:
Durevent Polypro (Single Wall): 2PPS-xxx (2”), 3PPS-xxx (3”)
Centrotherm
I
W: ISxx02xx (2”), ISxx03xx (3”)
Refer to manufacturer’s literature for detailed information.
** For installation in Canada
ld-supplied plastic vent piping must comply
with CAN/CGA B149.1 (latest edition) and be cer
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 ttings. All plastic components a
s and glues
of
the
ed 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 cer
s part
of the boiler.
