Navien NP Condensing Tankless Gas Water Heater - Service Manual

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8.2.3. Transformer 1. Turn off the gas supply. 2. Turn off the 120V power supply. 3. Turn off the water supply. 4. Loosen the PCB 2 screw from bottom base. 5. Pull out the PCB. (refer to 8.2.1 PCB) 6. Loosen the 2 screws from transformer. < Figure 7 > 7. Pull out the transformer. 8. Replace with new transformer. 9. Tighten the 2 screws from transformer. 10. Replace the PCB. (refer to 8.2.1 PCB) 11. Install front panel using 4(four) screws. 12. Turn on water supply, power supply, and gas supply. ©Navien America Inc. 2010 138 NR/NP series service Manual Version 2.0
8.2.4. Fan Motor(Combustion Air) 1. Turn off the gas supply 2. Turn off the 120V power supply 3. Turn off the water supply 4. Remove the four screws securing the front panel. Remove front panel. 5. Loosen three fixing screws from the fan assembly 7.Pull out the fan assembly < Figure 10 > < Figure 8 > 6. Disconnect the harness housing at the fan assembly. 8. Attach the fan to be replaced. 9. Fix the three screws of the fan. 10. Attach the harness housing to the fan assembly 11. Install front panel using 4(four) screws. 12. Turn on water supply, power supply, and gas supply. NOTE 1. Don’t over tight screws with high torque drill. It will be damaged to fan housing. 2. Confirm whether the screws tighten enough or not. 3. Confirm whether there are unnecessar noises after reinstalled fan. < Figure 9 > ©Navien America Inc. 2010 139 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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Page 92 and 93: Off at switch of stage Defective ai
Page 94 and 95: 5.11. 16Error Error occurrence cond
Page 96 and 97: Temperature fuse > < Check if the t
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
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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 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
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
Page 178: Memo ©Navien America Inc. 2010 176
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Navien NP Condensing Tankless Gas Water Heater - Service Manual

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