Navien NP Condensing Tankless Gas Water Heater - Service Manual

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6. Inspection Check and clean the heating system once a year. We advise you to offer your customer an annual inspection 6.1. Preparing the Water heater for Inspection • Precautions on security before working • Inspection items and entire procedures • Tools required when inspection - Volt/Ohm/Amp meter with test probes - Digital manometer or U tube type manometer with 14 inch water column (w. c.) scale, a hose and two 1/8 inch taps - Assorted screw drivers - Leak solution or leak detector - Teflon tape ©Navien America Inc. 2010 128 NR/NP series service Manual Version 2.0
6.2. Measuring Gas Pressure Setting 6.2.1. How to Check Inlet Gas Pressure The Navien water heater cannot operate properly without sufficient inlet gas pressure and volume. Below are instructions on how to check the inlet gas pressure. THIS SECTION IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL Procedure to measure the inlet gas pressure: 1. Shut off the manual gas valve on the supply gas line. 2. Open a hot faucet. The unit should turn on and the gas in the gas pipe line should purge. Leave the faucet on to keep the unit running until the unit shuts down due to lack of gas supply. Then shut off the hot faucet. OPEN CLOSE 3. Remove the screw for the pressure port located on the gas inlet of the water heater. Pressure test port on gas line 4. Connect a manometer to the pressure port and reset it to zero. 5. Re-open the manual gas valve. Check to see that there are no gas leaks. 6. Open multiple fixtures that have high flow rates (bathtub, showers, kitchen sink) to ramp the water heater up to its maximum burn. 7. When the Navien water heater is at maximum burn, check the inlet gas pressure reading on the manometer; it should read between 5”(6” 180 model) ~10.5” W.C for Natural gas between 8.0” (9” 180 model) ~13.5” W.C for Liquid Propane. 8. The maximum inlet gas pressure must not exceed the value specified by the manufacturer and that the minimum value listed is for the purposes of input adjustment. 129 ©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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Page 82 and 83: Check method Error type Sensor erro
Page 84 and 85: Does the fan moter have normal oper
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Page 88 and 89: Check method Error type Cause Check
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Page 94 and 95: 5.11. 16Error Error occurrence cond
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Page 108 and 109: Emergency measures against closed f
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Page 118 and 119: 1. Drain water, and unfasten the up
Page 120 and 121: Check method Error type Defective s
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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
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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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Page 146 and 147: WARNING Failure to correctly assemb
Page 148 and 149: WARNING Failure to correctly assemb
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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
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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
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Navien NP Condensing Tankless Gas Water Heater - Service Manual

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