Navien NPE-240A Service Manual

Version 2.21
4 NPE Service Manual
1. Safety Information 8
1.1 Safety Definitions 8
1.2 Safety Symbols
8
1.3 Symbols Used in the Instructions
8
1.4 Safety Precautions
8
2. Product Information 12
2.1 Product Information 12
2.2 Layout and Key Components
13
3. Technical Data 16
3.1 General Specifications 16
3.2 Dimensions
17
4. System Details 18
4.1 Schematic and Flow Diagram 18
4.2 Operation Flow Chart
20
4.3 Setting the DIP Switches
21
4.4 Measuring the Inlet Gas Pressure
24
4.5 Selecting a Recirculation Mode
27
4.6 Gas Conversion
29
4.7 The Front Panel
34
4.8 Wiring Diagram
52
4.9 Ladder Diagram
54
4.10 Electrical Diagnostic Points
56
4.11 Key Components Description
58
4.11.1 PCB 58
4.11.2 High Limit Switch
59
4.11.3 Thermistor
60
4.11.4 Fan Motor
61
4.11.5 Flame Rod Assembly
62
4.11.6 Ignition Transformer
63
4.11.7 APS
64
4.11.8 Main Gas Valve
65
4.11.9 Burner
66
4.11.10 Water Adjustment Valve
67
4.11.11 Flow Sensor
68
4.11.12 Primary Heat Exchanger
69
4.11.13 Secondary Heat Exchanger
70
4.11.14 Buffer Tank (“A” models only)
71
4.11.15 Circulation Pump (“A” models only)
72
5. Troubleshooting 73
5.1 Error Code List 73
5.1.1 003Error 76
5.1.2 004Error
81
5.1.3 012Error
83
5.1.4 016Error
88
5.1.5 030Error
91
5.1.6 046Error
93
5.1.7 047Error
93
5.1.8 060Error
94
5.1.9 109Error
96
5.1.10 110Error
98
5.1.11 407Error
99
5.1.12 421Error 100
5.1.13 432Error
101
5.1.14 434Error
102
5.1.15 438Error ("A" models only)
105
5.1.16 439Error
107
5.1.17 441Error
110
5.1.18 445Error
110
5.1.19 515Error
113
5.1.20 517Error
114
5.1.21 593Error
114
5.1.22 594Error
115
5.1.23 615Error
115
5.1.24 736Error
116
5.1.25 782Error
116
5.1.26 740Error
117
5.1.27 760Error
117
5.1.28 785Error
117
5.2 Troubleshooting guide by symptom 118
6. Replacement of Parts 121
6.1 Replacement Procedure 121
6.2 Components Replacement Instructions
121
7. Components Diagram and Part List 133
7.1 Case Assembly 133
7.2 Burner Assembly(NPE-180A/ 210A/ 240A)
135
7.3 Burner Assembly(NPE-150S/ 180S/ 210S/ 240S)
137
7.4 Waterway Assembly(NPE-150S/ 180S/ 210S/ 240S)
139
7.5 Waterway Assembly(NPE-150S/ 180S/ 210S/ 240S)
141
7.6 Fan(Gas) Assembly
143
8. Inspection and Maintenance Schedule 145
8.1 Maintenance 145
8.2 Annual Servicing
149
8.3 Inspection Report
150
8.4 Maintenance Report
150
9. Common Vent and Outdoor vent Cover Installing
151
9.1 Installing the Outdoor vent Cover 151
9.2 Installing Procedure
152
9.3 Choosing an Installation Location
153
9.4 Mounting Water Heater
154
9.5 Ventilation Flow
155
9.6 Common Venting
156
10. Installing the H2Air
+ 158
10.1 About the H2Air
+ 158
10.2 Installing the Device 159
10.3 Wiring the Device
161
10.4 Configuring the Device
163
10.5 Configuring the NPE-180A/240A Water Heater 164
10.6 Maintenance
170
10.7 Appendix
170
Contents

Navien NPE-240A Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
Energy Factor	0.97
Energy Efficiency	97%
Voltage	120V
Ignition Type	Electronic
Maximum Input	199, 900 BTU/h
Water Connection Size	3/4"
Gas Connection Size	3/4"
Warranty	15-year on heat exchangers, 5-year on parts, 1-year on labor
Dimensions	17.3" W x 13.2" D x 27.4" H