Navien NP Condensing Tankless Gas Water Heater - Service Manual

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8.2.8. Manifold 143 8.2.9. Main Gas Valve 145 8.2.10. GPS 147 8.2.11. Condensation Trap 148 8.2.12. Water Adjustment Valve 149 8.2.13. Flow Sensor 150 8.2.14. Buffer Tank (“A” Series) 151 8.2.15. Circulation Pump (“A” Series) 152 8.2.16. 3-way Valve (“A” Series) 154 8.2.17. 2-way Valve (“NP-A” “NP” Series) 155 8.2.18. Bypass Mixing Valve (“Non-A” Series) 156 9. COMPONENTS DIAGRAM AND PART LIST 157 9.1. CASE DISASSEMBLE (NR/NP – A, NR/NP) 157 9.2. BURNER DISASSEMBLE (NR/NP – A, NR/NP) 159 9.3. WATER WAY DISASSEMBLE (NR-A) 162 9.4. WATER WAY DISASSEMBLE (NR) 163 9.5. WATER WAY DISASSEMBLE (NP-A) 164 9.6. WATER WAY DISASSEMBLE (NP) 165 10. INSPECTION AND MAINTENANCE SCHEDULE 169 10.1. ANNUAL SERVICING 169 10.2. INSPECTION REPORT 170 10.3. MAINTENANCE REPORT 171 ©Navien America Inc. 2010 4 NR/NP series service Manual Version 2.0
Revisions Version Description of changes Date 1.00 2.00 First Issue Format Revision 04/27/10 July/20/10 ©Navien America Inc. 2010 5 NR/NP series service Manual Version 2.0
Page 1: Service Manual Service Manual Servi
Page 4 and 5: 4.4.2. NP-A Model 37 4.4.3. NR Mode
Page 8 and 9: Navien Warranty CAUTION This produc
Page 10 and 11: WARRANTY EXCLUSIONS This warranty d
Page 12 and 13: Abbreviation and Definition Abbrevi
Page 14 and 15: 1.4. Safety Precautions DANGER FLAM
Page 16 and 17: DANGER WHAT TO DO IF YOU SMELL GAS
Page 18 and 19: GAS TYPE and AC VOLTAGE WARNING Nav
Page 20 and 21: 2.2. Layout and Key Components 2.2.
Page 22 and 23: 2.2.3. NR Model No Description Navi
Page 24 and 25: 3. Technical Data 3.1. General Spec
Page 26 and 27: 3.2.2. NR, NP Model 1) Connection D
Page 28 and 29: 4.1.2. NP-A Model Exhaust pipe inta
Page 30 and 31: 4.1.3. NR Model Exhaust pipe Intake
Page 32 and 33: YES GPS normal? YES MGV ON NO Lock-
Page 34 and 35: B Lock-out Outlet Thermistor >= 208
Page 36 and 37: 4.3. Dip Switch Settings There are
Page 38 and 39: 4.4. Wiring Diagram 4.4.1. NR-A Mod
Page 40 and 41: 4.4.3. NR Model ©Navien America In
Page 42 and 43: 4.5. Electrical Diagnostic Points G
Page 44 and 45: Point Function Wire Color Normal Va
Page 46 and 47: 4.6.2. Thermal Fuse Navien Part No.
Page 48 and 49: 4.6.4. High Limit Switch or Exhaust
Page 50 and 51: 4.6.6. Fan motor Navien Part No. Fu
Page 52 and 53: 4.6.8. Ignition Transformer Navien
Page 54 and 55: 4.6.10. Manifold PABCR180AMF_001 Na
Page 56 and 57:
4.6.12. GPS Navien Part No. Functio
Page 58 and 59:
4.6.14. Water Adjustment Valve Navi
Page 60 and 61:
4.6.16. Primary Heat Exchanger Navi
Page 62 and 63:
4.6.18. Buffer Tank (“A” Series
Page 64 and 65:
4.6.20. Bypass Mixing Valve (“Non
Page 66 and 67:
Error Code E021 Reason Cold water i
Page 68 and 69:
Check method Error type Cause The m
Page 70 and 71:
Scenario 1 Is the igniter normally
Page 72 and 73:
Check method Error type Cause Check
Page 74 and 75:
Solenoid valve Proportional valve A
Page 76 and 77:
To the direction of air supply hose
Page 78 and 79:
Check method Error type Flame befor
Page 80 and 81:
Check method Error type Sensor erro
Page 82 and 83:
Check method Error type Sensor erro
Page 84 and 85:
Does the fan moter have normal oper
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5.8. 10Error Error occurrence condi
Page 88 and 89:
Check method Error type Cause Check
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5.9. 12Error Error occurrence condi
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Off at switch of stage Defective ai
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5.11. 16Error Error occurrence cond
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Temperature fuse > < Check if the t
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Page 108 and 109:
Emergency measures against closed f
Page 110 and 111:
Check method Error type Defective s
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Page 114 and 115:
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Page 118 and 119:
1. Drain water, and unfasten the up
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Check method Error type Defective s
Page 122 and 123:
Check the connection of wire to wir
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Page 126 and 127:
5.27. Troubleshooting guide by symp
Page 128 and 129:
5.27.2. Hot water Error Cause Remot
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6. Inspection Check and clean the h
Page 132 and 133:
6.2.2. Adjusting the Gas-Air Ratio
Page 134 and 135:
7. Maintenance Describe precautions
Page 136 and 137:
7.3. Flushing the Heat Exchanger Fo
Page 138 and 139:
8.2. Components Replacement Instruc
Page 140 and 141:
8.2.3. Transformer 1. Turn off the
Page 142 and 143:
8.2.5. Flame Rod 1. Turn off the ga
Page 144 and 145:
8.2.7. APS 1. Turn off the gas supp
Page 146 and 147:
WARNING Failure to correctly assemb
Page 148 and 149:
WARNING Failure to correctly assemb
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8.2.11. Condensation Trap 1. Turn o
Page 152 and 153:
8.2.13. Flow Sensor 1. Turn off the
Page 154 and 155:
8.2.15. Circulation Pump (“A”Se
Page 156 and 157:
8.2.16. 3-way Valve (“A” Series
Page 158 and 159:
8.2.18. Bypass Mixing Valve (“Non
Page 160 and 161:
NO Description Navien Part No. Rema
Page 162 and 163:
Page 164 and 165:
9.3. Water Way Disassemble (NR-A)
Page 166 and 167:
9.5. Water Way Disassemble (NP-A)
Page 168 and 169:
Page 170 and 171:
Page 172 and 173:
10.2. Inspection Report Inspection
Page 174 and 175:
Memo ©Navien America Inc. 2010 172
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Page 178:
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Navien NP Condensing Tankless Gas Water Heater - Service Manual

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