Navien NP Condensing Tankless Gas Water Heater - Service Manual

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4.1.3. NR Model Exhaust pipe Intake air duct Fan motor Manifold Burner Primaty H/E Bypass Mixing v/v Water adjustment v/v Secondary H/E Flow sensor 2-Way v/v Main gas v/v Hot water supply Cold water supply Fuel gas inlet ©Navien America Inc. 2010 28 NR/NP series service Manual Version 2.0
4.2. Operation Flow Chart Power ON System lnitalization Faucet Open Stand-by Faucet Close Flow Sensor >= 0.53 GPM NO MGV OFF MGV OFF YES Flame On: YES SGV1 OFF SGV1 OFF NO B SGV2 OFF SGV2 OFF Pre-Purge Watch-dog OFF MV OFF No Air Check: APS normal? YES Watch-dog ON D NO YES Igniter OFF GV/Igniter Power OFF NO Post-Purge: 10 sec DHW Waiting: Fan Motor ON for 300 sec Fan Motor ON/ AP Check Flame ON? NO YES NO MGV OFF? YES FM start-up: FM and AP normal? YES Burner Start-up GV/Igniter Power ON Igniter ON C NO B Flow Sensor >= 0.53 GPM Lock-out: 004E Lock-out: 015E NO NO NO NO SGV1 OFF? YES SGV2 OFF? YES Igniter OFF? YES Flow Sensor >= 0.53 GPM YES Igniter ON for 1 sec? NO Lock-out: 027E C YES Igniter OFF Lock-out: 009E FM Control Lock-out: 010E APS normal? NO YES ©Navien America Inc. 2010 29 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 6 and 7: 8.2.8. Manifold 143 8.2.9. Main Gas
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 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
Page 86 and 87:
5.8. 10Error Error occurrence condi
Page 88 and 89:
Check method Error type Cause Check
Page 90 and 91:
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
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Check method Error type Defective s
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Page 114 and 115:
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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
Page 130 and 131:
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
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8.2.7. APS 1. Turn off the gas supp
Page 146 and 147:
WARNING Failure to correctly assemb
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WARNING Failure to correctly assemb
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8.2.11. Condensation Trap 1. Turn o
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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:
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9.3. Water Way Disassemble (NR-A)
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9.5. Water Way Disassemble (NP-A)
Page 168 and 169:
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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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