Navien NFB-175 User manual

1
󱂓Unpacking
Navien
Condensing
Boiler
User’s Information
Manual, Installation
& Operation Manual
Air Vent
Wall Flanges Conversion Kit Wall Mounting
Bracket
Tapping screws
and anchors
Pressure Relief Valve,
Heating
Vent Termination
Caps
Air Vent
Bushing
(3/4 in to 1/2 in)
Outdoor
Temperature Sensor
and Cable
Condensate Trap
System Temperature Sensor
Model
NFB-175/200
Quick Installation Guide
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 tter, or a professional service technician. Navien is
not liable for any damages or defects resulting from improper
installation.
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).
Safety
DO NOT install the boiler in areas with excessively high humidity.
Location Requirements
Select the best location on “Choosing an Installation Location” in the Installation &
Operation Manual.
Allowable minimum clearances
Top
Back
Side
Side
Front
Bottom
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
STEP 2 Installing
󱂔Checking the Rating Plate
>
This boiler is congured
for Natural Gas from the
factory. If conversion to
Propane Gas in required,
the conversion kit supplied
with the boiler must be
used.
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
dierent 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 eld conversion of this boiler without a Navien gas conversion
kit. Doing so will result in dangerous operating conditions and will void the warranty.
Navien Inc. is not liable for any property damage and/or personal injury resulting from
improper conversions.
󱂕Mounting on the Wall
>
CAUTION
Do not install the boiler on dry walls without proper reinforcement.
Drill in the supplied anchor bolts
after considering where the vent
termination will be located.
1
Lift up the boiler, rest the unit on the hooks
provided on the wall bracket on the wall.
Secure the mounting bracket to the wall
with the tapping screws and anchors.
2
󱂖Removing the Front Cover
>
Unclasp the 4 buckles that x
the cover to the boiler, and then
remove the cover by lifting it
and pulling it outward
2
3

2
󱂗Gas Piping Connections
>
󱂘Water Piping Connections
>
Space Heating System
A pressure relief valve must be installed when installing pipings for
a heating system.
Install the included 3/4in, 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 boiler.
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).
CAUTION
Do not solder piping directly onto the water connections, as
the heat may cause damage to internal components. Use
threaded water connections only.
Note Prior to connecting plumbing to the boiler, ush the
entire systemto ensure it is free of sediment, ux,
scale, debris or other impurities that may be harmful
to the system and boiler. During the assembly of the
heating system, it is important to keep the inside of
the piping free of any debris including construction
dust, copper burr, sand and dirt.
Pressure
Relief Valve Pressure
Relief Valve Air Vent
External
LWCO
Water Piping Connections
Space
Heating
Supply
Gas
Connection
Space
Heating
Return
Condensate
Outlet
System Fill Connection
Air Vent Cap
Air Vent
Air Vent
Bushing
The Navien NFB 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.
Before lling the boiler, remove the air vent cap to allow the system
to ll properly. Replace the cap when the system is full.
Note Ensure that the vent cap is re-installed and the vent
screws on the system and boiler pumps are properly
tightened before testing or operating the system.
From
System
Expansion Tank
Make-up
Water
Pump
To system
Air Separator
Pressure Relief Valve
Gas Supply Line
Gas Inlet Adapter
Gas
Regulator
Gas supply
Bottom View
The boiler is
recommended
to be the rst
appliance to be
connected to
the gas supply
line.
Drip rig
The gas meter capacity
must be greater than
the total gas capacity of
connected appliances.
Example:
Gas meter
425 CFH ≥Boiler 195 CFH +Furnace 58.8 CFH +Domestic gas stove 63.7CFH
* 1 CFH=1,020 Btuh
1/2" rigid pipe can be used; refer to the sizing tables in the Installation & Operation
Manual for limitations. Avoid using 1/2" corrugated connectors or tubing as noise may
occur.
󱂙Condensate Drain Connection
>
A condensate drain pipe must be connected to the 1/2”condensate trap tting at the
bottom of the unit and water must be poured into the exhaust connection to ll the
condensate trap.
Condensate trap
Floor drain
Water
The end of the 1/2” (NPT) plastic piping should drain into a laundry tub or into a oor
drain.
Note Do not submerge the end of
the pipe in water.
a
b
c
d
Direct to the external drain
To the
Drain via a
neutralizer
External drain
To the laundry tub
To the laundry tub
via a condensate pump

3
󱂚Venting
>
󱂛Electrical Connections
>
Vent Termination Options
Horizontal vent termination
12" (300 mm) min.
12" (300 mm)min.
Interior view
Intake Air
Exhaust Gas
12" (300 mm) min.
12" (300 mm) min.
Exterior view
Vertical vent termination Sidewall vent termination
12"min. from any
obstruction above,
below, left, or right
12" (300 mm) min.
12" (300 mm) min.
36" (900 mm) min.
12" (300 mm) min.
Concentric Vent Termination
Sidewall installation
Combustion Air
Combustion Air
1" (25mm) min.
Maintain 12" (300
mm) min. clearance
above highest
anticipated snow
level or grade,
whichever is greater
Vent
Roof installation
Vent
Vent
Combustion Air
Maintain 12” (300mm) min.
clearance above highest
anticipated snow level or
grade, whichever is greater
(maximum of 24” above roof)
Combustion
Air
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 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
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 dierent (see below).
Navien recommended venting materials
Locale Recommended Vent Materials
USA
·PVC/CPVC Schedule 40 or 80 (Solid Core)
·Approved Polypropylene (PP)
·Approved Stainless Steel (SS)
Canada*
·Type BH Special Gas Vent Class IIA (PVC)
·Type BH Special Gas Vent Class IIB (CPVC)
·Type BH Special Gas Vent Class IIC (Polypropylene/Stainless Steel)
* For installation in Canada, eld-supplied plastic vent piping must comply with CAN/CGA B149.1 (latest
edition) and be certied 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 and specied primers and glues of the certi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 certied as part of the boiler.
External LWCO Connection
(if required by local codes)
Power Connection
COM
NO
NC
ZONE1
COM
NO
NC
ZONE2
COM
NO
NC
ZONE3
AC24VN
AC24VL
LWCO
R
W
C
R
W
C
W
C
Neutral
Line
Line
LWC O
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 re 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.
Conrmation of DIP Switch Settings
DIP Switch 1 (6 switch unit) DIP Switch 2 (8 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
SW Function Setting
1Gas Type Natural Gas
Propane Gas
1-OFF
1-ON
2 Reserved - -
3 Reserved - -
4 Reserved - -
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 When PCB DIP switch 2 #8 is set to
On, ensure that CPVC or
polypropylene piping is used for
exhaust venting.

4
STEP 3 After Installing
󱂓Opening All the Valves
>
Gas Valve Space Heating System Valves
Shut-o
valves
Power ON Adjust Temperatures View Basic Information Resetting the Boiler
Space Heating Temperature DHW Temperature
1. In normal operation mode, rotate
the Command dial ( ). The space
heating temperature ( ) is
highlighted on the screen.
2. Rotate the Command dial ( ) to
the right to select the DHW
temperature.
3. Press the Command dial ( ) to
select the indirect DHW
temperature ( ). The highlighted
section will ash.
4. Rotate the Command dial ( )to
the right or left to increase or
decrease the temperature.
5. Press the Command dial ( ) to
conrm the new temperature.
Note DHW temperature higher
than 180 °F can cause
scalding.
When the power is on, the boiler
automatically enters normal
operation mode, and the boiler’s
operating conditions are diaplayed
on the screen.
1. In normal operation mode, rotate the
Command dial ( ). The space
heating temperature ( ) is
highlighted on the screen.
2. Press the Command dial ( )to select
the space heating temperature. The
highlighted section will ash.
3. Rotate the Command dial ( )to the
right or left to increase or decrease
the temperature.
4. Press the Command dial ( )to
conrm the new temperature.
1. Press the Menu button ( ), and
then select “2. Status
Information”.
2. Rotate the Command dial ( ) to
switch between the information
items.
If an error message appears during
boiler operation, reset the boiler to
resolve the problem. Press the Back
button ( ) on the front panel to
reset the boiler.
Note If resetting does not
solve the problem, refer
to the troubleshooting
section of the User’s
Information Manual or
contact the service
center.
1
Open Closed
2
Open a hot water
faucet. The boiler
should turn on and
the gas in the gas
supply line will be
purged.
2
3
3 4
Shut o the manual gas valve. Leave the faucet on until the boiler shuts down
due to a lack of gas supply, and then turn o the
hot water faucet.
Remove the front cover by
loosening the 4 screws.
Loosen the screw indicated in the gure and
connect a manometer to the pressure port.
Reset the manometer to zero before use.
5
Open
Re-open the manual
gas valve and check
for leaks.
Open multiple
xtures that have
high ow rates, such
as bathtub and
shower faucets, to
ramp the boiler up to
its maximum ring
rate.
6
NG: 3.5”–10.5”WC
LP: 8.0”–13.5”WC
Recommended
Gas Pressure Settings:
Check the inlet gas pressure reading on the manometer.
If not,
Gas supply
Adjust the inlet gas pressure with gas
regulator.
CAUTION
The boiler cannot function properly without sucient inlet gas pressure. Measuring the inlet gas pressure should be performed by a licensed professional only.
Navien, Inc.
20 Goodyear, Irvine, CA 92618
Tel: [phone], Fax: [phone]
www.navien.com
󱂖Installing the Front Cover
>
󱂗Ensure Maximum Water Flow
>
After running the boiler for the rst 10 minutes, turn it o and clean the cold water lter
and the space heating return strainer to remove any trapped debris.
󱂘Final Check
>
A trial run should be performed in accordance with the Installation checklist listed in
the boiler’s Installation & Operation Manual.
󱂔Operating the Boiler
>
󱂕Measuring the Inlet Gas Pressure
>