Electrical Connections; Power Connection - Navien NHB-055 Quick Installation Manual

Venting
Vent Termination Options
Horizontal Vent Termination
Interior view
Intake Air
Exhaust Gas
Vertical Vent Termination
36" (900 mm) min.
Exhaust Gas
Intake Air
12"min. from any
obstruction above,
below, left, or right
Venting Length
3" pipe venting
Maximum Length 150'
2-to-3-inch
reducer
Maximum number
of elbows: 8
• 90˚ elbow = 5 linear feet of venting
• 45˚ elbow = 3 linear feet of venting

Electrical Connections

External LWCO Connection
(if required by local codes)
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
Sidewall Vent Termination
2" pipe venting
Maximum Length 60'
Maximum number
of elbows: 6
• 90˚ elbow = 8 linear feet of venting
• 45˚ elbow = 4 linear feet of venting

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.
DO NOT allow
DO NOT
the boiler to be
touch the
exposed to
power
excessive
cord with
amounts of
wet hands.
water.
3
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
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
• PVC Schedule 40(Solid core)
USA
• CPVC Schedule 40 or 80(Solid core)
• Approved Polypropylene
• Type BH Special Gas Vent Class IIA (PVC)
Canada*
• 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.
In systems with 2 in. vents, if the exhaust temperature exceeds 149°F (65°C), CPVC
Caution
pipe (field supplied) must be used for the first 3 feet of equivalent pipe length. For
systems with 3 in. vents, if the exhaust temperature exceeds 149°F (65°C), CPVC
pipe (field supplied) must be used for the first 5 in. of equivalent pipe length.
Confirmation of Panel DIP Switch Settings
PCB Dip Switch 1 (6 switch unit)
SW Function Setting
1&2 Operation Normal
Status Operation
2-stage MAX
1-stage MIN
1-stage MAX
Front Panel Dip Switch 1 (10 switch unit)
SW Function Setting
2 Temperature °C (Celsius)
Unit
°F (Fahrenheit)
4&5 High 0-1,999 ft
Altitude (0-609 m)
2,000-5,399 ft
(610-1,645 m)
5,400-7,699 ft
(1,646-2,346 m)
7,700-10,100 ft
(2,347-3,078 m)
Front Panel Dip Switch 2 (2 switch unit)
SW Function Setting
2 Gas Type Natural Gas
Propane Gas
Combustion Air
Maintain 12" min.
clearance above
1" (25 mm) min.
highest anticipated
snow level or grade.
PCB Dip Switch 2 (8 switch unit)
SW Function Setting
1&2 Space Supply
1-OFF
2-OFF Heating Temperature
Temperature
Return
1-ON
Control
2-OFF Temperature
1-OFF
System Supply
2-ON
Temperature (with
optional sensor)
1-ON
2-ON
System Return
Temperature (with
optional sensor)
3 DHW Tank DHW Supply
2-ON
Temperature Temperature
Control
2-OFF
DHW System
Supply
4-OFF
Temperature
5-OFF
7 Space Used
4-ON
5-OFF Heating
Unused
Thermostat
4-OFF
5-ON
8 Exhaust Used
Temperature
4-ON
Unused
Control
5-ON
* Above 2,000 ft (610 m), the boiler will derate by 4% for
each 1,000 ft (305 m) of altitude gain.
2-OFF
2-ON
1-OFF
2-OFF
1-ON
2-OFF
1-OFF
2-ON
1-ON
2-ON
3-OFF
3-ON
7-OFF
7-ON
8-OFF
8-ON