Navien NHB-055, NHB-110, NHB-150, NHB-080 Operation Manual
Installation & Operation Manual
NHB Condensing Boilers
Model
NHB-055
NHB-080
NHB-110
NHB-150
Keep this manual near this boiler for future
reference whenever maintenance or service
is required.
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.
12.4 Component Assembly Diagrams and Parts Lists
12.4.1 Case Assembly
7
9
6
5
10
1
1
9
9
3
4
2
2
8
93Appendixes
# Description Part # Remark
20030085A NHB-110/150
1 Case
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
94 Appendixes
12.4.2 Heat Exchanger and Waterway Assembly
20
12
3
7
21
22
13
12
7
3
11
12
18
12
2
1
6
2
10
12
19
12
7
16
7
17
6
3
4
2
5
7
12
12
9
12
7
8
15
12
14
7
23-1
23
95Appendixes
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