Navien NP Condensing Tankless Gas Water Heater - Service Manual

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WARNING Failure to correctly assemble the components according to these instructions may result in a gas leak or explosion. 13. Replace the gas pipe. Replace the Oring where the assembly attaches to the gas connection. Make sure the old Oring removed and discarded. 14. Replace the PCB. 15. Install front panel using 4(four) screws. 16. Turn on water supply, power supply, and gas supply. 17. Perform the measuring of gas pressure setting procedure. 18. Check for gas leaks. NOTE 1. Always replace with new gasket. 2. Wiring should be in right position. 3. Always use right part(Oring) and right size and place to pipe. ©Navien America Inc. 2010 144 NR/NP series service Manual Version 2.0
8.2.9. Main Gas Valve 1. Turn off the gas supply 2. Turn off the 120V power supply 3. Turn off the water supply 4. Loosen the PCB right-side screw from bottom base 5. Pull out the PCB. (refer to 8.2.8 PCB) 6. Pull out the gas pipe. (refer to 8.2.9 Manifold) 7. Detach the air pressure feedback tube and remove the wire harness connector from the 2 solenoid valve and modulating valve. 9. Remove the gas valve screws from the gas adapter. < Figure 25 > < Figure 23> 8. Detach the gas pressure sensor tube. 10. Pull out the gas valve. 11. Positioned gas valve. 12. Attach the gas valve and secured with screws. 13. Assemble the air pressure feedback tube, gas pressure sensor tube and wire harness connector. 14. Replace the gas pipe. Replace the O-ring where the assembly attaches to the gas connection. Make sure the old O-ring removed and discarded. < Figure 24 > 145 ©Navien America Inc. 2010 NR/NP series service Manual Version 2.0
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Service Manual Service Manual Servi
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4.4.2. NP-A Model 37 4.4.3. NR Mode
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8.2.8. Manifold 143 8.2.9. Main Gas
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Navien Warranty CAUTION This produc
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WARRANTY EXCLUSIONS This warranty d
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Abbreviation and Definition Abbrevi
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1.4. Safety Precautions DANGER FLAM
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DANGER WHAT TO DO IF YOU SMELL GAS
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GAS TYPE and AC VOLTAGE WARNING Nav
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2.2. Layout and Key Components 2.2.
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2.2.3. NR Model No Description Navi
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3. Technical Data 3.1. General Spec
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3.2.2. NR, NP Model 1) Connection D
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4.1.2. NP-A Model Exhaust pipe inta
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4.1.3. NR Model Exhaust pipe Intake
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YES GPS normal? YES MGV ON NO Lock-
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B Lock-out Outlet Thermistor >= 208
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4.3. Dip Switch Settings There are
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4.4. Wiring Diagram 4.4.1. NR-A Mod
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4.4.3. NR Model ©Navien America In
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4.5. Electrical Diagnostic Points G
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Point Function Wire Color Normal Va
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4.6.2. Thermal Fuse Navien Part No.
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4.6.4. High Limit Switch or Exhaust
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4.6.6. Fan motor Navien Part No. Fu
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4.6.8. Ignition Transformer Navien
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4.6.10. Manifold PABCR180AMF_001 Na
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4.6.12. GPS Navien Part No. Functio
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4.6.14. Water Adjustment Valve Navi
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4.6.16. Primary Heat Exchanger Navi
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4.6.18. Buffer Tank (“A” Series
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4.6.20. Bypass Mixing Valve (“Non
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Error Code E021 Reason Cold water i
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Check method Error type Cause The m
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Scenario 1 Is the igniter normally
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Check method Error type Cause Check
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Solenoid valve Proportional valve A
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To the direction of air supply hose
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Check method Error type Flame befor
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Check method Error type Sensor erro
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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
Page 96 and 97: Temperature fuse > < Check if the t
Page 98 and 99: 5.13. 22Error Error occurrence cond
Page 108 and 109: Emergency measures against closed f
Page 110 and 111: Check method Error type Defective s
Page 118 and 119: 1. Drain water, and unfasten the up
Page 120 and 121: Check method Error type Defective s
Page 122 and 123: Check the connection of wire to wir
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
Page 144 and 145: 8.2.7. APS 1. Turn off the gas supp
Page 148 and 149: WARNING Failure to correctly assemb
Page 150 and 151: 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 164 and 165: 9.3. Water Way Disassemble (NR-A)
Page 166 and 167: 9.5. Water Way Disassemble (NP-A)
Page 172 and 173: 10.2. Inspection Report Inspection
Page 174 and 175: Memo ©Navien America Inc. 2010 172
Page 176 and 177: Memo ©Navien America Inc. 2010 174
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Navien NP Condensing Tankless Gas Water Heater - Service Manual

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