Navien NP Condensing Tankless Gas Water Heater - Service Manual

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B Lock-out Outlet Thermistor >= 208 YES Lock-out: 001E MGV OFF NO Outlet Thermistor >= 14 NO YES Lock-out: 007E SGV1 OFF SGV2 OFF Outlet Thermistor >= 248 YES Lock-out: 008E Watch-dog OFF NO NO Control Board Abnormal? YES Lock-out: 015E Igniter OFF NO High-Limit-Switch 1 Open? NO YES Lock-out: 016E GV/Igniter Power OFF B Inlet Thermistor 1 >= 14 NO YES Lock-out: 021E Main Power Reset? inlet Thermistor 1 >= 248 YES Lock-out: 022E YES Power ON NO High-Limit-Switch 2 Open? YES Lock-out: 030E NO Inlet Thermistor 2 >= 14 YES Lock-out: 032E PUMP Abnormal? YES Lock-out: 038E NO NO Inlet Thermistor 2 >= 248 YES Lock-out: 033E Mixing Valve Abnormal? YES Lock-out: 045E NO NO Outlet Thermistor 2 >= 14 YES Lock-out: 041E Cascade Connection Abnormal? YES Lock-out: 043E NO Outlet Thermistor 2 >= 248 YES Lock-out: 042E NO Thermistor Connection Abnormal? NO YES Lock-out: 044E ©Navien America Inc. 2010 32 NR/NP series service Manual Version 2.0
Operation 1. Water Flow Begins • Water Flow Sensor sends pulses to the PCB. • PCB senses flow greater than 0.5 GPM (0 GPM for “A” Model) (approximate). • Firing Sequence begins. 2. Firing Sequence • PCB monitors Inlet / Outlet water temperature, temperature set point, and water flow rate. • Fan Motor energized. Purges combustion chamber. • Spark igniter begins sparking • Main Gas control valve opens to minimum fire rate. • Flame rod proves ignition. • Spark igniter stops sparking. 3. Normal Operation • PCB monitors flame rod, fan motor frequency, outlet water temperature, PCB temperature set point and water flow rate. • Main Gas control valve modulates gas input to required firing rate. • Combustion fan speed is adjusted for the required firing rate. • Water adjustment valve is adjusted as needed. 4. Shut-down Sequence • PCB senses flow rate less than 0.5 GPM (0 GPM for “A” Model) (approximate). • Main Gas Control valve closes. • Water adjustment valve resets to standby position. • Combustion fan runs for a short period of time at low speed. 5. Standby Mode • PCB monitors water temperature and remote controls. • Freeze protection is activated as needed. 33 ©Navien America Inc. 2010 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 30 and 31: 4.1.3. NR Model Exhaust pipe Intake
Page 32 and 33: YES GPS normal? YES MGV ON NO Lock-
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
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Does the fan moter have normal oper
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5.8. 10Error Error occurrence condi
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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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Emergency measures against closed f
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Check method Error type Defective s
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1. Drain water, and unfasten the up
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Check method Error type Defective s
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Check the connection of wire to wir
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5.27. Troubleshooting guide by symp
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5.27.2. Hot water Error Cause Remot
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6. Inspection Check and clean the h
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6.2.2. Adjusting the Gas-Air Ratio
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7. Maintenance Describe precautions
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7.3. Flushing the Heat Exchanger Fo
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8.2. Components Replacement Instruc
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8.2.3. Transformer 1. Turn off the
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8.2.5. Flame Rod 1. Turn off the ga
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8.2.7. APS 1. Turn off the gas supp
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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
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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
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NO Description Navien Part No. Rema
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9.3. Water Way Disassemble (NR-A)
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9.5. Water Way Disassemble (NP-A)
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10.2. Inspection Report Inspection
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Memo ©Navien America Inc. 2010 172
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Navien NP Condensing Tankless Gas Water Heater - Service Manual

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