Navien NHB-055 User manual

WARNING
If the information in these instructions is not followed exactly, a fire or explosion may result, causing
property damage, personal injury, or death.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
WHAT TO DO IF YOU SMELL GAS

Do not try to light any appliance.

Do not touch any electrical switch; do not use any phone in your building.

Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.

If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency or the gas
supplier.
The installation must conform with local codes or, in the absence of local codes, the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Code.
Keep this manual near this boiler for future
reference whenever maintenance or service
is required.
Installation & Operation Manual
NHB Condensing Boilers
Model
NHB-055
NHB-080
NHB-110
NHB-150

93Appendixes
12.4 Component Assembly Diagrams and Parts Lists
12.4.1 Case Assembly
1
3
4
2
8
7
9
9
5
6
9
10 1
2

94 Appendixes
# Description Part # Remark
1 Case 20030085A NHB-110/150
20030088A NHB-055/080
2 Cover 30013463A
3 PCB 30013044A
4 Front Panel 30013041A
5 Exhaust Pipe Assembly 30008673A
6 Intake Air Duct Assembly 30008662B
7 Intake Air Fillter 20007667A
8 Air Pressure Sensor 30010238A
9 Rubber Ring 20029318A
10 PCB Lower Bracket 20030117A

95Appendixes
12.4.2 Heat Exchanger and Waterway Assembly
13
12
11
7
7
2
5
4
23
16
6
7
3
3
18
3
21
6
2
22
1
9
14
15
12
12
10
12
12
12
7
23-1
7
20
12
7
12 2
19
17
12
12
87

96 Appendixes
# Description Part # Remark
1 Heat Exchanger Assembly
30014219A NHB-150
30013575A NHB-110
30014060A NHB-080
30014218A NHB-055
2O-Ring (P29) 20032163A NHB-110/150
O-Ring (Φ17.5x2.7t) 20003022A NHB-055/080
3 Fastener 20017724A NHB-110/150
20007853A NHB-055/080
4 High Limit Switch 30002558A
5 SC Outlet Adapter 30014032A NHB-110/150
30014067A NHB-055/080
6 Thermistor 30012907A
7 Fastener 20030608A NHB-110/150
20033662A NHB-055/080
8 Return Pipe 30013501A NHB-110/150
30013502A NHB-055/080
9 Supply Pipe (Lower) 30013505A NHB-110/150
30013506A NHB-055/080
10 Tee Adapter 20030188A NHB-110/150
30014259A NHB-055/080
11 Supply Pipe (Upper) 30013507A NHB-110/150
20030201A NHB-055/080
12 O-Ring (Φ 24.8 x 3.85t) 20032528A NHB-110/150
O-Ring (Φ 18.8 x 2.6t) 20003022A NHB-055/080
13 Air Vent Adapter 20030133A NHB-110/150
20033694A NHB-055/080
14 Heating Supply Adapter 20030136A NHB-110/150
20033713A NHB-055/080
15 Syphon 30015964A NHB-110/150
30014024A NHB-055/080
16 H-Ex Connection Adapter 1 20033547A NHB-110/150
20033548A NHB-055/080
17 Return Adapter 30014055A NHB-110/150
30014065A NHB-055/080
18 Igniter 30012226A
19 LWCO (Pressure Sensor) 20007924A
20 H-Ex Connection Pipe 30013503A NHB-110/150
30013504A NHB-055/080
21 H-Ex Connection Adapter 2 20030138A NHB-110/150
20026920A NHB-055/080
22 Thermistor (Exhaust) 30009478A
23 Heating Return Adapter 30015077A NHB-110/150
30015002A NHB-055/080
23-1 Return Filter 30015339A

97Appendixes
12.4.3 Combustion Parts Assembly
1
2
3
4
5
16
15
15
18
17
10-3
10-2
19
11
15
12
13
7
6
7
8
9
10-1
14

98 Appendixes
# Description Part # Remark
1 Ignition Transformer 30010455A
2 Mixed Chamber 20030041A NHB-110/150
20030049A NHB-055/080
3 Chamber Packing 20022743A NHB-110/150
20027108A NHB-055/080
4 Burner 30010246A NHB-110/150
30011854A NHB-055/080
5 Burner Packing 20021677A NHB-110/150
20027105A NHB-055/080
6 Fan Damper 30008825A
7 Fan Packing 20022744A
8 Mixed Guide Pipe 30015213A NHB-110/150
30013458A NHB-055/080
9 Fan Bracket 20030471A
10-1 Fan Assembly - NHB-150
- NHB-055/080/110
10-2 Dual Venturi
- NHB-150
- NHB-110
- NHB-055/080
10-3 Intake Pipe
20031242A NHB-150
20030064A NHB-110
20031243A NHB-055/080
11 Orifice Packing 20022660A
12 Gas Orifice
20032404A NHB-150 (NG)
20032403A NHB-110 (NG)
20032402A NHB-055/080 (NG)
20032407A NHB-150 (LP)
20032406A NHB-110 (LP)
20032405A NHB-055/080 (LP)
13 O-Ring (P34) 20019090A
14 Gas Pipe
30013955A NHB-150
30013509A NHB-110
30013510A NHB-055/080
15 O-Ring (P20) 20006934A
16 Gas Connector 20027149A
17 Gas Valve 30011586A
18 Gas Inlet Adapter 20027748A
19 Venturi Packing 20030060A

99Appendixes
12.5 Outdoor Temperature Sensor
Outdoor Temperature Sensor Installation
1. Pull out the sensor body from the cap.
2. Attach the body to the wall using the screws/anchors provided
with the device.
3. Run the wires into the device body through the grommet
opening.
4. Connect the wires to the terminal block.
5. Attach the cap to the body.
Navien Outdoor Temperature Sensor Kit
Outdoor Temperature Sensor Installation Guidelines
Avoid areas with temperature fluctuations by direct sunlight,
and where the temperature may not be representative of true
outdoor temperature.
Best location to install the temperature sensor is on a North or
Northeast side of a structure under eaves where the sensor is
shielded from direct sunlight.
Avoid placing sensor in close proximity of heat sources that may
affect correct temperature sensing. (fans, exhausts, vents, lights)
Avoid installing the sensor in areas where the sensor is subjected
to excessive moisture.
Use 18 gauge wiring (thermostat wiring) with no splices. (except
at the unit harness connection with blue leader wire.)
Caution should be taken to avoid potential electromagnetic
interference (EMI) by routing separately from potential sources
such as line voltage wiring. When necessary, shielded cable may
be used.
Make sure wiring connections are secure before closing the cap.
The sensor is a water resistant device.
Any damage to the device may require the replacement of the
entire component.

100 Appendixes
12.6 Outdoor Reset Control
The Outdoor Reset Control feature may be used to enhance energy
efficiency while maintaining optimal heating performance. With
the Outdoor Reset Control, the space heating temperature setting
automatically changes according to the outdoor temperature and
the current space heating system application (system load).
You can configure the Outdoor Reset Control settings on the front
panel by entering the Special Parameter Setting mode. Refer 11.6
Setting the Parameters” on page 78.
Note The Outdoor Reset Control feature requires installation
of an outdoor temperature sensor, and it only works
when the boiler is running in the normal operation
mode. It does not work when the boiler is running in
either the Minimum (MIN) or Maximum (MAX) mode, or
when the boiler’s front panel displays a fault.
45 40 35 30 25 20 15 10 5 0 -5 -10 -15 -20 -25
185
194
176
167
158
149
140
131
122
113
104
95
86
77
68
59
50
113 104 95 86 77 68 59 50 41 32 23 14 5 -4 -13 °F
°C
85
90
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
°F °C
Absolute
MAX
Absolute
MIN
Outdoor
High MIN Outdoor Low MIN
High Mass Radiant
Low Mass Radiant
Cast Iron Baseboard
Custom
Radiator
Finned Tube Baseboard
Fan Coil
Space Heating Temperature Setting for the
Outdoor Reset Control Feature
The following tables list the default space heating temperature
range by system heat load and the applicable outdoor
temperature ranges.
Outdoor Temperature Sensor Installation Guidelines
Heat Load Supply Set Point
Range
Return Set Point
Range
Finned Tube
Baseboard (default)
120-180°F
(48.5-82°C)
101-147°F
(38-63.5°C)
Fan Coil 140-180°F
(60-82°C)
116-147°F
(46.5-63.5°C)
Cast Iron Baseboard 100-170°F
(37.5-76.5°C) 86-139°F (30-59°C)
Low Mass Radiant 80-140°F
(26.5-60°C)
70-116°F
(21-46.5°C)
High Mass Radiant 80-120°F
(26.5-48.5°C) 70-101°F (21-38°C)
Radiators 120-170°F
(48.5-76.5°C)
101-139°F
(38-59°C)
Custom 104-180°F
(40-82°C)
86-149°F
(30-65°C)
Outdoor Temperature Range and Default Temperature Settings
Set Point Range Remarks
Outdoor Low
Temperature
-4°F (-20°C) to
Outdoor High
Temperature Set
Point - 9°F (5°C)
Default: 14°F
(-10°C)
Outdoor High
Temperature
Outdoor Low
Temperature Set
Point + 9°F (5°C) to
104°F (40°C)
Default: 70°F (21°C)

Memo

Getting Service
If your boiler requires service, you have several options for getting service:
Contact Technical Support at 1-800-519-8794 or on the website: www.navien.com.
For warranty service, always contact Technical Support first.
Contact the technician or professional who installed your boiler.
Contact a licensed professional for the affected system (for example, a plumber or electrician).
When you contact Technical Support, please have the following information at hand:
Model number
Serial number
Date purchased
Installation location and type
Error code, if any appears on the front panel display.
800.519.8794 www.Navien.com
20 Goodyear lrvine, CA 92618
Installation & Operation Manual
NHB Condensing Boilers
THE LEADER IN CONDENSING TECHNOLOGY
Version: 2.2 (Feb. 25, 2016)