Navien NP Condensing Tankless Gas Water Heater - Service Manual

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WARRANTY EXCLUSIONS This warranty does not cover the following conditions: • Damages, malfunctions, or failures resulting from failure to install the water heater in accordance with applicable building codes, ordinances or normal plumbing and electrical trade practices. • Damages, malfunctions or failures resulting from improper installation or failure to operate and maintain the water heater in accordance with the manufacturer’s instructions provided. • Performance problems caused by improper sizing of the water heater or the gas supply line, the venting connection, combustion air openings, electric service voltage, wiring or fusing. • Damages, malfunctions or all failures caused by conversion from natural gas to LP gas or LP gas to natural gas or attempt to operate with a type of gas not specified for the water heater. • Damages, malfunctions or failures caused by operating the water heater with any parts removed or with parts that have been modified, altered or unapproved for installation. • Damages, malfunctions or failures caused by abuse, negligence, alteration, accident, fire, flood, freezing, lightning and other acts of God. • Heat Exchanger failures caused by operating the water heater in a corrosive or contaminated atmosphere. • Damages, malfunctions or failures caused by poor water quality, lime or mineral build-up or sediment build-up. • Damages, malfunctions or failures caused by operating the unit at water temperatures outside the factory calibrated temperature limits and/or exceeding the maximum setting of the high limit control. • Heat Exchanger failures caused by operating the water heater when it is not supplied with potable water at all times. • Damages, malfunctions or failures caused by subjecting the heat exchanger to pressures or firing rates greater or lesser than those shown on the rating plate. • Units installed outside of the fifty states (and the District of Columbia) of the United States of America and outside of Canada. • Rating plate has been removed by an unauthorized person. A water heater should not be operated if the rating plate has been removed. • Damage due to freezing. Product Disposal Measures Dispose of components of the heating system that require replacement in an environmentally responsible manner. Make sure that condensate disposal method is in accordance with local regulations. 8 ©Navien America Inc. 2010 NR/NP series service Manual Version 2.0
Handling of This Manual Scope • This Service Manual is applicable to Navien Tankless Water Heater NR/NP Series. Product Model discrimination label located in 2 places. Precautions for Handling of This Manual • Navien America Inc. reserves all rights related to this manual • This manual should be accessible only to technical service personal authorized by Navien America Inc. • Read and understand the safety information before operating or servicing this Navien Water Heater. About Notation in the Manual Indication of Refer To The “” mark is used to indicate the chapter or section you should refer to its format is as indicated below. {3.1 General Specification} of {3.1} ©Navien America Inc. 2010 9 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 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
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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
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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
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8.2.16. 3-way Valve (“A” Series
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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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