Navien NHB-55 User manual

Quick Installation Guide
Model
NHB-055/080/110/150
1
STEP 1 Before Installing
Read the Installation & Operation Manual before
installing
.
This product must be
installed and serviced by a licensed
plumber, a licensed gas fitter, or a professional service
technician. Navien is not liable for any damages or defects
resulting from improper installation.
Safety
DO NOT install the boiler in areas with excessively high humidity.
Location Requirements
Select the best location on “Choosing an Installation” in the installation
Manual.
Allowable minimum clearances
STEP 2 Installing
Unpacking Checking the Rating Plate
This boiler is configured for Natural Gas
from the factory. If conversion to Propane
Gas i
s required, the conversion kit supplied
with
the boiler must be used.
Mounting on the Wall Removing the Front Cover
Remove the
4 screws
Drill in the supplied anchor bolts
after considering where the vent
termination will be located.
CAUTION
Do not install the boiler on dry walls without proper reinforcement.
WARNING
•Before connecting the gas supply, determine the gas type and
pressure for the boiler by referring to the rating plate. Use only the
same gas type indicated on the rating plate. Using a different gas
type will result in abnormal combustion and malfunction of the
boiler. Gas supplies should be connected by a licensed professional
only.
•The appliance and its gas connection must be leak tested before
placing the appliance in operation.
•This boiler cannot be converted from natural gas to propane or vice
versa without a Navien gas conversion kit. Do not attempt a field
conversion of this boiler without a Navien gas conversion kit. Doing
so will result in dangerous operating conditions and will void the
warranty.
Navien America Inc. is not liable for any property damage and/or
personal injury resulting from improper conversions.
Clearance
Indoor Installation
Top
9 in (229 mm) minimum
Back
0.5 in (13 mm) minimum
Front
4 in (100 mm) minimum
Sides
3 in (76 mm) minimum
Bottom
12 in (300 mm) minimum
Top
Back
Side
Side
Front
Bottom
WARNING
Follow all local codes and/or the most recent edition of the National Fuel Gas Code
(ANSI Z223.1/NFPA 54) in the USA, or the Natural Gas and Propane Installation Code in
Canada (CAN/CGA B149.1).
Installation & Operation Manual
User’s Information Manual
Vent terminators
Wall flanges
Spare Parts
Tapping screws and anchors
Wall mounting bracket
Air vent
Conversion Kit
Pressure Relief Valve (Heating)
Outdoor Temperature Sensor
and Cable
Air Vent Bushing (3/4” to 1/2”)
Lift up the boiler, rest the unit on the hooks
provided on the wall bracket on the wall.
The
n, install 2 fix screws through the bottom
bracket to secure the boiler to the wall.
Secure the mounting
bracket to the wall with
the tapping screws and
anchors.

2
Gas Piping Connections
Water Piping Connections
Condensate Drain Connection
A condensate drain pipe must be connected to the 1/2 in condensate outlet fitting at
the bottom of the unit and water must be poured into the exhaust connection to fill
the condensate trap.
The end of the 1/2 in (NPT) plastic piping should drain into a laundry tub or into a
floor drain.
Do not submerge the end of the
pipe in water.
Note
Syphon
Condensate
Outlet
Water
Floor drain
NPT 1/2 in
Expansion Tank
Circulator
Pressure Relief Valve
Air Separator
Caution
Water Piping Connections
Space Heating System
Install the included 3/4 in, maximum 30 psi pressure
relief valve on the space heating
supply.
An ASME approved HV pressure relief valve for space
heating system is supplied with the boi
ler.
You may install the pressure relief valve on the space
heating supply of the Navien Manifold System, or on
the top connection along with the air vent (and an
external LWCO, if required).
Pressure
Relief
Valve
External LWCO
Air Bent
Rubber
Grommet
Condensate
Outlet
Gas Connection
Ensure that the Air Vent Cap is removed
before filling the system.
System will not be properly filled without
the air vent cap removed. Air in the
system may
cause malfunctions and
system overheating.
Make-up
Water
Pressure
Relief Valve
A pressure relief valve must be installed when installing
pipings for a heating system
.
From
System
Air Vent Cap
Space Heating
Return
Before filling the boiler, remove the air vent
cap to allow the system to fill properly.
Replace the cap when the system is full.
The Navien NHB boilers have a top
connection for an air
vent. An air vent must
be installed
to purge air from the boiler
system.
When
installing the air vent, install the air
vent bushing between the air vent and the
top connection.
Air Vent
Air Vent Bushing
Do not solder piping directly onto
the water connections, as the heat
may cause damage to internal
components.
Use threaded water
connections only.
Warning
Direct to the
external drain
To the laundry
tub
To the drain
via a neutralizer
To the laundry tub
via a condensate
pump
System Fill Connection
External drain
Space Heating
Supply
The boiler is recommended to be the first
appliance to be connected
to the gas
supply line.
Gas Supply Line
Gas
Regulator
Gas supply
The gas meter capacity must be
greater than the to
tal gas capacity
of connected appliances.
Drip
rig
Bottom View
Gas inlet adapter
Example:
Gas meter
425 CFH
≥
Boiler
195 CFH
+
Furnace
58.8 CFH
+
Domestic gas stove
63.7CFH
* 1 CFH=1,020 Btuh
•1/2 in rigid pipe can be used; refer to the sizing tables in the Installation
Manual for limitations. Avoid using 1/2" corrugated connectors or tubing as
noise may occur.
To system

3
Venting
Electrical Connections
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 1 (10 switch unit)
SW
Function
Setting
2
Temperature
Unit
°C (Celsius)
2-ON
°F (Fahrenheit)
2-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
PCB Dip Switch 1 (6 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
PCB Dip Switch 2 (8 switch unit)
SW
Function
Setting
1&2
Space
Heating
Temperature
Control
Supply
Temperature
1-OFF
2-OFF
Return
Temperature
1-ON
2-OFF
System Supply
Temperature (with
optional sensor)
1-OFF
2-ON
System Return
Temperature (with
optional sensor)
1-ON
2-ON
3
DHW Tank
Temperature
Control
DHW Supply
Temperature
3-OFF
DHW System
Supply
Temperature
3-ON
7
Space
Heating
Thermostat
Used
7-OFF
Unused
7-ON
8
Exhaust
Temperature
Control
Used
8-OFF
Unused
8-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.
Horizontal Vent Termination
Interior view
Intake Air
Exhaust Gas
Exterior view
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.
Concentric Vent Termination
Sidewall installation
Vent
Combustion Air
Combustion Air
1" (25 mm) 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" (900 mm) min.
Exhaust Gas
Intake Air
12"(300 mm)min.
12"min. from any
obstruction
above,
below,
left, or right
12"(300 mm)min.
Sidewall Vent Termination
Vent Termination Options
12"(300 mm)min.
Caution
Confirmation of Panel DIP Switch Settings
Power Connection
External LWCO Connection
(if required by local codes)
Front Panel Dip Switch 2 (2 switch unit)
SW
Function
Setting
2
Gas Type
Natural Gas
2-OFF
Propane Gas
2-ON
In systems with 2 in. vents, if the exhaust temperature exceeds 149°F (65°C), CPVC
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.

4
STEP 3 After Installing
Opening All the Valves
Operating the Boiler
Measuring the Inlet Gas Pressure
Installing the Front Cover Final Check
A trial run should be performed in accordance with the Installation checklist listed in
the boiler’s Installation & Operation Manual.
Shut off the manual gas
valve.
Closed
Remove the front cover by
loosening the 4
screws.
Loosen the screw indicated in the
figure and connect a manometer
to the
pressure port. Reset the
manometer to zero before use.
Open
Check the inlet gas pressure reading on the manometer.
Re-open the manual gas valve
and check for leaks.
Ope
rate multiple zones that to
ramp the boiler up to its
maxim
um firing rate.
Adjust the inlet gas pressure
with gas regulator.
Gas supply
If it is out of
the range,
NG:3.5”~10.5”
WC
LP:8.0”~13.5”WC
Recommended Gas Pressure Settings:
1. Turn on the boiler. On the Front
Panel press the Diagnostics
button for over 5 seconds until
“1.PAR”is displayed.
2. Press the + (Up) button two times
to change the display to“3.OPR”.
3. Press the + (Up) button until
“MAX2”is displayed.
4. Press the Reset button twice
to return to normal operation
mode.
5.
Run space heating. The gas in
the gas supply line will be
purged.
6. Leave the boiler on until the
boiler shuts down due to a
lack of gas supply, and then
turn off the boiler.
Power ON
Adjust Temperatures
View Basic Information
Resetting the Boiler
When the power is on, the boiler
supply water temperature will
appear with the water pressure
on the front panel display at
5 second intervals.
1. Press the Mode button three
times. “INFO” will appear on
the display.
2.
Press the + (Up) or – (Down)
buttons to switch between
the information types.
If an error message appears, you
can try resetting the boiler to
resolve the problem.
Note
Space Heating Temperature
1. Press the Mode button
once. The space heating
icon turns on.
2.
Press the + (Up) or –
(Down)
buttons until the desired
temperature appears on
the display.
If resetting does not solve
the problem,
refer to the
troubleshooting section of
the
User’s Information
Manual
or contact the
service center.
DHW Indirect Supply Temperature
3.
Press the Mode button
twice. The DHW heating
icon turns on.
4.
Press the + (Up) or –
(Down)
buttons until the desired
temperature appears on the
display.
Shut-off Valves
Navien, Inc.
20 Goodyear, Irvine, CA 92618
Tel: (949) 420
-0420, Fax: [phone]
www.na
vien.com
Gas Valve
Space Heating System Valves
Drip rig
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