Navien NP Condensing Tankless Gas Water Heater - Service Manual

More documents

Recommendations

Info

5.27. Troubleshooting guide by symptom 5.27.1. Noise Error type Vibration noise Regular noise Noise at ignition Cause Defective installation Blower vibration noise Defective flow sensor Malfunction of water adjustment valve Gas and air differential pressure error (Pop, Beep, Explo-sive ignition) Check method Incorrect level setting or fixing error Check the fixing state, and reinstall the unit. Vibration caused due to defective blower FAN balance. Touch the blower. If vibration is significant, replace the blower. If intermittent noise occurs during operation, check the blower. If vibration noise occurs during operation of the product, and stops when the case lid is removed, check the blower. Rotating noise due to foreign substance entered into the flow sensor. Noise due to repeated opening/closing of water adjustment valve due to a defective PCB. 1. Gas differential pressure adjustment error Adjust differential pressure with the pressure adjusting screw on the main gas valve. DIP S/W 1,2 ON (S/W 3 MIN), If noise occurs at standard value, adjust setting above/ below the standard. 2. Excessive gas supply due to defective proportional valve on the main gas valve. Check if the proportional valve wire is open, and if there is a problem, replace the main gas valve.. 3. Gas supply error due to defective air pressure sensor. 4. If the same error is repeated, it is due to a defective PCB. Differential pressure setting error Beep if the gas pressure is excessive due to defective adjustment of differential pressure between gas and air. Noise similar to the boiling noise Adjust Stage 3 MAX differential pressure by model on the specification table. Noise during combustion Boiling noise How to check the boiling noise: Boiling noise occurs if the water temperature rises to149 ~167 (65~75). 1. The heat exchanger is clogged partially due to defective welding. Replace the heat exchanger if the error occurs from the start of the installation. 2. The heat exchanger is clogged due to foreign substance. Clean the main heat exchanger by removing scale. Replace the main heat exchanger if the error continues after the cleaning. ©Navien America Inc. 2010 124 NR/NP series service Manual Version 2.0
Whirring Low gas pressure (whirring) Exhaust gas flow into the boiler through the air inlet makes combustion noise. Check the distance between inlet and outlet (at least 6”). Check the distance between flues if two or more units are installed (at least 24”). Check if there is any obstacle near the flue. 1. Noise occurs due to flame lifting when gas pressure is low. Check the gas supply pressure (dynamic pressure) 2. Low gas supply due to differential pressure error. Set DIP S/W 1, 2 to ON (3-stage MIN), 3. Noise due to clogged or damaged gas pressure sensor hose. 4. Check the failure of the gas pressure sensor (output voltage check). Noise from burner stage switch Disassemble the nozzle and check if the hole is narrowed due to foreign substance. Set DIP S/W 1, 2 to ON (3-stage MIN), and check the flame. Compare flame of Burner at combustion section of stages 1, 2 and 3. Check the nozzle if there is a comparatively unbalanced burner section. Noise due to defective air pressure sensor. Replace the air pressure sensor. Noise during combustion Noise due to torn air pressure hose. Noise may be intermittent depending on the size of the damage. ©Navien America Inc. 2010 125 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 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
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
Page 84 and 85: Does the fan moter have normal oper
Page 86 and 87: 5.8. 10Error Error occurrence condi
Page 88 and 89: Check method Error type Cause Check
Page 90 and 91: 5.9. 12Error Error occurrence condi
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
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 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
show all

Navien NP Condensing Tankless Gas Water Heater - Service Manual

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?