Navien NCB-240 User manual

Quick Installation Guide
Model
NCB-180/210/240
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.
Whe
n applicable, the installation must conform with
Manufactured Home Construction and Safety Standard, Title 24 CFR, Part 3280
and/or CAN/CSA Z240 MH Series, Mobile Homes.
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 &
Operation 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 in required, the conversion kit supplied
with
the boiler must be used.
Mounting on the Wall Removing the Front Cover
Remove the
4 screws
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.
Drill in the supplied anchor
bolts after considering where
the vent term
ination 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.
Navien Combination Boiler
User’s Information Manual,
Installation & Operation Manual
Wall mounting bracket
Tapping screws and anchors
Vent terminators
Wall flanges
Conversion Kit
Spare Parts
Pressure Relief Valve (30PSI)
Flow Restrictors
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).

2
Gas Piping Connections
Water Piping Connections
Condensate Drain Connection
A condensate drain pipe must be connected to the 1/2” 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”(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
The
boiler is recommended to be the first
appliance to be connected
to the gas supply
line.
Gas meter
’
s capacity
≥
Total gas capacity of connected appliances
Gas supply
Gas
Regulator
Bottom View
Gas Inlet Adapter
Gas Supply Line
Example:
Gas meter
425 CFH
≥
Boiler
195 CFH
+
Furnace
58.8 CFH
+
Domestic gas stove
63.7CFH
* 1 C
FH=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.
Built-in Water Fill Connection
Navien NCB boiler is equipped with
an auto
-feeding water connection
and motorized feeding valve.
Therefore, installation of additional
system water fill connection is not
necessary in most cases.
Note
Backflow
Preventer
Make-up
Water
External Water Fill Connection
Heating
Supply
Expansion Tank
Circulator
Pressure Relief Valve
Air Separator
Warning
Water Piping Connections
Space Heating System
DHW System
Install the included 3/4 in, maximum 30
psi pressure relief valve on the space
heating
supply.
An ASM
E approved HV pressure relief
valve for space heating system is
supplied with the boiler
.
The DHW pressure relief valve is
not supplied, but is required.
I
nstall an approved 3/4 in,
maximum 150 psi pressure relief
valve on the hot water
outlet.
Space
H
eating
Return
Space
Heating
Supply
Pressure Relief
Valve
Pressure
Relief
Valve
Cold Water
Supply
DHW
Supply
Space
Heating
Supply
Space
Heating
Return
DHW
Supply
Cold
Water
Inlet
Built-in
Water Feeder
Connection
Flow Restrictor (for DHW system)
Flow Rate (GPM) and Water Pressure (psi)
Orange
Yellow
Blue
The boiler has a built-in flow restrictor at
the cold water inlet adapter to limit the
overall
DHW flow. Three additional flow
restrictors
are provided for different flow
rates.
Refer to the following graph and install
an appropriate restrictor for your DHW
system.
See the Installation & Operation
Manual (page 21, 22) for detailed
procedures.
Flow Restrictors (Orange, Yellow, and Blue)
Ensure that the Air Vent Cap is removed
before fillin
g 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
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
System Fill Connection
The Navien NCB boilers
have a built
-in air vent
on top of the internal
circulator to purge air
from the boiler system.
Air Vent Cap
Before filling the boiler, remove the air vent cap to
allow the s
ystem to fill properly. Replace the cap
when the system is full.
Heating
Return

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"(300mm)min.
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)
c
learance above highest
anticipated snow level
m
aximum of 24" above
roof
.
Combustion
Air
Vent
Combust
ion 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"(300mm)min.
12"min. from any
obstruction
above,
below,
left, or right
12"(300mm)min.
Sidewall vent termination
12" (300mm) min.
Vent Termination Options

4
STEP 3 After Installing
Opening All the Valves
Operating the Boiler
Measuring the Inlet Gas Pressure
Installing the Front Cover Ensure Maximum Water Flow
After running the boiler for the first 10 minutes, turn it off and clean the cold water
filter 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.
Shut off the manual gas
valve.
Open
Closed
Remove the front cover
by loosening the 4
screws
.
Loosen the screw indicated in the
figure and connect a manometer t
o
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.
Open multiple fixtures
that have high flow rates,
such as bathtub and
shower fauce
ts, to ramp
the boiler up to its
maximum firing rate.
Adjust the inlet gas pressure with
gas regulator.
Gas supply
If not,
NG : 3.5
”~10.5”
WC
LP
: 8.0”~13.5”
WC
Recommended Gas Pressure Settings:
Open a hot water
faucet. The boiler
should turn on and
the gas in the gas
supply line will be
purged.
Leave the faucet on until the boiler
shuts down due to a lack of gas
supply, and then turn off the hot
water faucet
.
CAUTION
The boiler cannot function properly without sufficient inlet gas pressure.
Measuring the inlet gas pressure should be performed by a licensed professional only.
Power ON
Adjust Temperatures
View Basic Information
Resetting the Boiler
When the power is on, the water
temperature of the space heating
supply will appear with the water
pressure on the front panel
display in 5 second intervals.
1. Press the Mode button three
times. “INFO” will appear on
the display.
2.
Press the + or – 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
DHW Temperature
1.
Make sure that all hot
water faucets are closed,
and ensure that the
internal circulator and any
external circulating
pumps are off.
2.
Press the Mode button
twice. The DHW mode
icon turns on.
3.
Press + (Up) or – (Down)
buttons until the desired
temperature appears on
the display.
Note
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.
DHW temperature
highe
r than 125°F can
cause scalding
.
If resetting does not solve
the problem,
refer to the
troubleshooting section of
the
User’s Information
Manual
or contact the
service center.
Closed
Shut-off valves
Navien America, Inc.
20 Goodyear, Irvine, CA 92618
Tel: (949) 420
-0420, Fax: [phone]
www.na
vienamerica.com
Gas Valve
Open
Space Heating System Valves
DHW System Valves
Shut-off valves