Noritz NRC661-DV Service Manual Download Page 16 | Manualshive

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Noritz NRC661-DV Service Manual Download Page 16

Thermistor-Cold Water

Thermistor-

Hot Water

Gas Proportioning Valve

4. Operating Principle

16

<NRC661 (-DV, -OD), NRC711 (-DV, -OD)>

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Summary of Contents for NRC661-DV

Page 1: ...ance Rev Dec 2013 Contents Important Safety Information 2 1 Speci cations Performance Table 3 2 Dimensions 9 3 Components 12 4 Operating Principle 16 5 Operation Flow Chart 19 6 Wiring Diagram 25 7 Tr...

Page 2: ...short circuit any safety device on this appliance If a safety device is not functioning properly replace the part Do not under any cir cumstances short circuit the part Exhaust and gas leakage cautio...

Page 3: ...nger Supply Consumption Power Vented NG 35W LP 38W Freeze Prevention 139W 20 5 520mm x 13 8 350mm x 6 7 170mm N A N A NR501 OD NR662 OD 3 Speci cation NR662 OD Outdoor Wall Mounted Direct Ignition 15...

Page 4: ...evention 139W 23 6 600mm x 13 8 350mm x 6 7 170mm 20 5 520mm x 13 8 350mm x 6 7 170mm NRC661 DV OD Speci cation NRC711 DV NRC711 OD Indoor Wall Mounted Outdoor Wall Mounted Direct Ignition 15 150 psi...

Page 5: ...tervals 6 Options 120 F 50 C 130 F 54 C 135 F 57 C 140 F 60 C Original is 120 F 50 C Item Gas Consumption Maximum Hot Water Capacity Capacity Range Temperature Settings Default Temperature Options NG...

Page 6: ...emp 82 Flow Rate GPM Set temperature 80 90 100 110 120 130 140 150 160 0 1 2 3 4 5 6 7 8 NR501 OD NRC661 DV NRC661 OD Spring Fall Inlet water temp 64 80 90 100 110 120 130 140 150 160 0 1 2 3 4 5 6 7...

Page 7: ...15 20 25 30 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 Flow rate GPM Pressure loss psi 0 10 20 30 40 50 60 Pressure loss Ft of head 0 5 10 15 20 25 30 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 Flow rate GPM Pressu...

Page 8: ...Pressure loss psi 0 10 20 30 40 50 60 70 80 90 Pressure loss Ft of head 0 5 10 15 20 25 30 35 40 45 50 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 Flow rate GPM Pressure loss psi 0 10 20 30 40 50 60 70 80 90...

Page 9: ...ASE NR501 OD HOT WATER OUTLET 1 8 45mm COLD WATER INLET 1 9 49mm GAS INLET 2 0 50mm 2 Dimensions NR501 OD 1 5 37mm AIR INLET DISPLAY WINDOW COLD WATER INLET HOT WATER OUTLET WATER DRAIN VALVE WIRING T...

Page 10: ...ATER INLET 3 4 HOT WATER OUTLET 3 4 CONDENSATE DRAIN 1 2 0 4 10mm 0 4 10mm 2 0 50mm 4 7 120mm 3 3 85mm 2 0 3 0 5 6 5 13mm OBLONG HOLE 4 0 5 13mm 21 3 542mm 0 4 10mm 0 4 10mm 19 2 487mm 1 2 31mm 6 7 17...

Page 11: ...WIRING THROUGHWAY COLD WATER INLET 3 4 HOT WATER OUTLET 3 4 CONDENSATE DRAIN 1 2 0 4 10mm 0 4 10mm 2 0 50mm 4 7 120mm 3 3 85mm 2 0 3 0 5 6 5 13mm OBLONG HOLE 4 0 5 13mm 21 3 542mm 0 4 10mm 0 4 10mm 19...

Page 12: ...12 NR501 OD Thermistor Cold Water Thermistor Hot Water Manifold Pressure Tap Thermistor Cold Water Thermistor Hot Water Manifold Pressure Tap 3 Components NR662 OD...

Page 13: ...Thermistor Cold Water Thermistor Hot Water Manifold Pressure Tap Thermistor Cold Water Thermistor Hot Water Manifold Pressure Tap NRC661 DV NRC661 OD 13...

Page 14: ...NRC711 DV 14 NRC711 OD Thermistor Cold Water Thermistor Hot Water Manifold Pressure Tap Manifold Pressure Tap Thermistor Cold Water Thermistor Hot Water Manifold Pressure Tap...

Page 15: ...r is on set temperature is displayed for one minute When hot water ows If there is a problem with the unit a numerical error code will ash When unit is initially plugged into power set temperature is...

Page 16: ...Thermistor Cold Water Thermistor Hot Water Gas Proportioning Valve 4 Operating Principle 16 NRC661 DV OD NRC711 DV OD...

Page 17: ...NR501 OD NR662 OD Thermistor Cold Water Thermistor Hot Water Gas Proportioning Valve 17...

Page 18: ...one is installed 5 When the demand for hot water ceases the unit will stop heating When the flow sensor detects that the rate has dropped below the minimum rate for continued burning the gas valves w...

Page 19: ...19 5 Operation Flow Chart Water heating Shutdown procedure Ignition operation NR501 OD...

Page 20: ...Water heating Shutdown procedure Ignition operation 20 NR662 OD...

Page 21: ...s turn OFF Has 15 min passed C C YES YES YES YES YES YES YES NO YES NO NO NO NO NO NO Thermistor Air more than 14 F 10 C YES NO Thermistor Air more than 14 F 10 Thermistor Air more than 14 F 10 NO NO...

Page 22: ...d does not 0 5 A or less Outlet water temp is too high Thermistor Cold Water open or shorted Thermistor Heat Exchanger open or shorted Fan speed abnormality Exhaust temperature is too high Overheat pr...

Page 23: ...ter heating Shutdown procedure Ignition operation Note 1 1 2 3 4 5 6 7 8 9 Note 2 1 2 3 Note 3 1 2 4 Note 4 1 2 3 4 F 1 2 3 4 5 6 7 8 9 A b C d E F 1 0 1 2 3 4 5 6 2 0 1 2 3 4 5 6 7 8 9 23 NRC711 DV O...

Page 24: ...200 500rpm 611 61 Thermistor Exhaust 26 F or more Fan Turn OFF No error code 611 612 614 61 Thermistor Exhaust 46 or more Fan Turn OFF YES NO YES NO YES NO YES NO YES NO YES NO Fan motor operation fl...

Page 25: ...FAN E D IG 15V POWER CIRCUIT GND GND GND WATER FLOW SENSOR WATER SERVO MAIN HIGH LIMIT SWITCH SOLENOID VALVE 0 SOLENOID VALVE 1 SOLENOID VALVE 2 SOLENOID VALVE 3 IGNITER POWER CONTROL CIRCUIT GAS PRO...

Page 26: ...IMIT SWITCH SOLENOID VALVE 0 SOLENOID VALVE 1 SOLENOID VALVE 2 SOLENOID VALVE 3 IGNITER POWER CONTROL CIRCUIT GAS PROPORTIONING VALVE FLAME DETECTING CIRCUIT FLAME ROD EARTH WATER LEVEL ELECTRODE DETE...

Page 27: ...ATER FLOW SENSOR WATER SERVO MAIN HIGH LIMIT SWITCH SOLENOID VALVE 0 SOLENOID VALVE 1 SOLENOID VALVE 2 SOLENOID VALVE 3 IGNITER POWER CONTROL CIRCUIT GAS PROPORTIONING VALVE FLAME DETECTING CIRCUIT FL...

Page 28: ...or frozen 20 Error Codes Remote Controller 11 760 90 73 72 71 70 33 32 35 51 91 94 61 31 30 16 14 12 20 11 331 321 351 353 51 511 611 311 301 14 121 122 20 90 731 72 71 70 91 941 Check connection fro...

Page 29: ...DC 1 16 V CN59 W O W G W V W BK 10 12 DC 14V 16 V R BL 3 CN63 9 12 Y BL Y BL CN63 1 CN63 2 DC 1 4 5 V 32 212 F 0 100 C Note 4 CN63 3 CN63 2 DC 1 4 5 V 32 212 F 0 100 C Note 4 BL Electrode 1 1 1 CN27...

Page 30: ...Note 5 BL Electrode 1 1 1 CN27 CN27 2 2 6 3 CN10 CN10 11 When valve is open Coil resistance CN10 11 When valve is open Coil resistance Gas Solenoid Valve 2 CN10 Coil resistance Flame Rod CN78 10 kHz...

Page 31: ...rs settings 733 Circuit Board setting abnormality Dip Switch settings 734 Circuit Board abnormality 768 76 Display Window transmission abnormality 90 90 Air flow abnormality Unit shuts off 901 Combust...

Page 32: ...uit Board Fuse Dip Switch Data Display 1 2 3 4 R BL BL BL CN142 DisplayWindow Circuit Board Dip Switch CN89B Data Display 1 2 3 4 R BL BL BL CN142 If there iscord damage short circuiting or ground fau...

Page 33: ...right do not apply in this case 1 How to check The Unit will not run to prevent scalding hot water temperature 001 Water inlet temperature is too high If possible decrease water inlet temperature 002...

Page 34: ...12 13 14 15 1 2 3 4 5 6 7 4 3 2 1 BR Y BL R R O Y W BL R W O GY BK W BL W BL 2 1 BL W BK BK 4 2 W W Fuse 3 1 R R G 3 2 1 BL 6 5 4 3 2 1 BK R W W 3 2 1 R BL G BL W R Y BK BK W W BK W CN63 CN135 CN78 C...

Page 35: ...nect the electrical power The Circuit Board and Fan Motor may be damaged otherwise 14 13 12 11 10 9 8 7 6 5 4 3 2 1 BL W R Y BK BK W W BK W Check whether the primary gas pressure is normal Check the W...

Page 36: ...t is described in page 24 It is not necessary to replace the Display Window Circuit Board The procedure of Manifold Gas Adjustment is described in page 24 It is not necessary to replace the Display Wi...

Page 37: ...m in gas supply poor connection of ground wire defectiv Normal Normal Normal Abnormal Abnormal Abnormal Abnormal Check whether the primary gas pressure is normal Check whether the manifold gas pressur...

Page 38: ...8 Blue 11 35 65 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 BL R W O GY BK W BL W BL It is not necessary to replace the Display Window Circuit Board It is not necessary to replace the Display Window Circuit...

Page 39: ...on if connected and open the hot water xture The unit starts sparking and then connectthe Dummy Flame between CN78 Blue 1 CN101 Green 1 earth Check whether Burner On Indicator is lit 72 should beindi...

Page 40: ...Y BK W BL W BL CN10 Display Window Circuit Board Dip Switch Data Display 1 2 3 4 R BL BL BL CN142 14 13 12 11 10 9 8 7 6 5 4 3 2 1 12 11 10 9 8 7 6 5 4 3 2 1 3 2 1 W Y O R BK V G O Y W 4 3 2 1 BL BL B...

Page 41: ...cuit Board Power Circuit Board Circuit Board 1 2 3 CN63 Between White 1 Black 2 Check the Thermistor Hot Water resistance Check for the Water Servo Main Check for improper connection of wiring When me...

Page 42: ...BR Y BL R R O Y W BL R W O GY BK W BL W BL 2 1 BL W BK BK 4 2 W W Fuse 3 1 R R G 3 2 1 BL 6 5 4 3 2 1 BK R W W 3 2 1 R BL G BL W R Y BK BK W W BK W CN63 CN135 CN78 CN59 CN142 CN104 CN27 CN92 CN101 CN...

Page 43: ...1 BL 6 5 4 3 2 1 BK R W W 3 2 1 R BL G BL W R Y BK BK W W BK W CN63 CN135 CN78 CN59 CN142 CN104 CN27 CN92 CN101 CN10 CN75 CN102 CN89A CN89B CN42 Main Circuit Board Power Circuit Board Circuit Board 1...

Page 44: ...Board Power Circuit Board Circuit Board 1 2 3 Check the Thermistor Exhaust open or short circuit CN63 Between Black 6 Black 2 When measuring the resistance disconnect the connector and check the male...

Page 45: ...Valve drive circuit abnormality Error Codes Description 51 511 51 Display Window Remote Controller It is not necessary to replace the Display Window Circuit Board Normal Abnormal Replace the Circuit...

Page 46: ...e g a k c o l b y r a r o p m e t Please explain this to the customer Replace the Fan Motor Replace the Fa n Motor Check the voltage to the Fan Motor Fan Motor is rotating 4 3 2 1 BR Y BL R CN27 Fan...

Page 47: ...dow Remote Controller 731 Improper maintenance writers setting Check for improper setting of maintenance writers on Circuit Board c t e e p y t l e d o m e p y t s a g e h t x e 733 Dip Switch setting...

Page 48: ...mal CN142 Blue 4 on Main Circuit Board CN142 Blue 4 on Display Window Circuit Board 1 or less Check the wiring connection between Main Circuit Board and Display Window Circuit Board Check the connecti...

Page 49: ...ay Window Remote Controller 1 Check air inlet for blockage or obstruction 2 Check exhaust for blockage or obstruction 3 Check whether the fan motor is normal ex Clogging of fan blades etc 4 Check the...

Page 50: ...CN10 Display Window Circuit Board Dip Switch Data Display 1 2 3 4 R BL BL BL CN142 14 13 12 11 10 9 8 7 6 5 4 3 2 1 12 11 10 9 8 7 6 5 4 3 2 1 3 2 1 W Y O R BK V G O Y W 4 3 2 1 BL BL BL R 1 2 3 4 5...

Page 51: ...mistor Hot Water are normal Check the thermistor resistance Replace the Circuit Board set Disconnect electrical power pass through the water to the Unit e and then reconnect electrical power Check the...

Page 52: ...nce for error code 908 If the Unit detects Error Code 901 6 times the Unit is locked for safety 1 Check air inlet for blockage or obstruction 2 Check exhaust for blockage or obstruction 3 Check the Fa...

Page 53: ...t Combustion abnormality Unit is locked Error Codes Description 99 99 Display Window Remote Controller NG LP NG LP NG LP 104 Unit is locked 99 NRC711 OD NG LP 110 NRC711 DV NG LP 104 NRC711 OD 110 NRC...

Page 54: ...d hold both the Mode and Maximum Manifold Pressure Set Button simultaneously for more than 5 seconds This procedure has to be perfomed within 10 minutes after reconnecting the power How to reset the l...

Page 55: ...2 3 4 5 6 x 100 hour 2 0 1 2 3 4 5 6 7 8 9 x 10 hour Ex If the code H25 is displ aye d it means 250 hours 2 1 Reconnect the blue connector f r And then replace the Heat Exchanger To cancel the lockou...

Page 56: ...itor List for Scale Build up trouble C Contact a service professional or download the procedure from http support noritz com Case 3 Flush the Heat Exchanger regularly Not displayed the error code For...

Page 57: ...water inlet valve V1 and the water outlet valve V2 3 Connect the one drain hose H1 to the drain valve V3 and then the other to the circulating pump 4 Connect the drain hose H2 to the circulating pump...

Page 58: ...ur passes the code C00 y Do not disconnect the blue connector f on the Circuit Board 7 Turn p 1 minute passes ow 3 Cleaning the Heat Exchanger rinsed and cleaned out of the water heater Below is the w...

Page 59: ...r more than 2 seconds or leave it alone for more than 10 minutes 1 The maintenance monitor data No will appear on the display for 2 seconds and then the data will appear 2 In order to switch to other...

Page 60: ...0 1 X 1 X 0 1 X 0 1 X 0 1 X 1 X 1 X 1 X 1 X 1 X 1 X 1 X 1 X 10 0 1 X 0 1 X 0 1 000 036 100 110 100 110 Disp Range 014 050 Disp Range 10 010 Z 126 A 101 B 102 C 103 Z 226 A 201 B 202 C 203 Z 326 A 301...

Page 61: ...old circuit board to the new circuit board see Step 4 New Circuit Board Connector CN75 4 Use the blue and white data transfer cable supplied with the new circuit board to connect the CN75 connection f...

Page 62: ...with a digital manometer and adjust if necessary For each MW the PRIORITY light will either be on indicating that the MW is ON or off indicating the MW is OFF You can toggle each MW to be ON or OFF u...

Page 63: ...t has a remote controller turn off the POWER button on the remote controller so it is blank and wait for 10 seconds then disconnect electrical power to the unit for about 30 seconds 3 Reconnect electr...

Page 64: ...water heater as with any gas appliance is the sole responsibility of the installer The installer must be professionally trained to do such work and must always follow all local and national codes and...

Page 65: ...020 2 680 2 430 2 230 2 080 1 950 1 840 1 630 3 11 300 7 780 7 780 5 350 4 740 4 290 3 950 3 760 3 450 3 260 2 890 4 23 100 15 900 12 700 10 900 9 660 8 760 8 050 7 490 7 030 6 640 5 890 Table 1 For...

Page 66: ...15m 18m 21m 24m 27m 30m 38m 1 2 454 312 250 214 190 172 158 147 138 131 116 3 4 949 652 524 448 397 360 331 308 289 273 242 1 1 787 1 228 986 844 748 678 624 580 544 514 456 1 1 4 3 669 2 522 2 025 1...

Page 67: ...ready for manifold gas pressure adjustment When the Data Display does not change repeat Step 1 again Note 1 Use the following procedure to adjust the manifold gas pressure only if it can be done with...

Page 68: ...g turn off the power button or power supply and wait until the unit cools before performing maintenance CAUTION Be sure to do Check For laundry newspaper timber oil spray cans and other combustible ma...

Page 69: ...eplacement of the neutralizing agent will be required Refer to the instructions supplied with the neutralizer for suggested replacement intervals Do not use benzene oil or fatty detergents to clean th...

Page 70: ...the Heat Exchanger must be flushed is set to Flushing Mode from an authorized Noritz wholesaler 70...

Page 71: ...located 71...

Page 72: ...ures 3 With a bucket ready remove the inlet and outlet drain plugs about 0 2 gallon 0 9L will drain out 4 Take the water drain valve with water lter out of the inlet See illustration to right 5 Clean...

Page 73: ...Treatment Guidelines If this water heater will be installed in an application where the supply water is hard the water must be treated with either the Noritz H2Flow or ScaleShield or a water softener...

Page 74: ...s a result of poor water quality is not covered by the Limited Warranty To ensure full warranty coverage treat or condition water that exceeds the target levels provided in this table Source EPA Natio...

Page 75: ...ion press the Power On Off Button on the optional remote controller To keep the water heater off let the unit sit for 30 sec to return to the original display When changing the temperature make sure t...

Page 76: ...n water through the unit when it is OFF but in this case freeze prevention is more important Remember to set mixing valves and xtures to their original levels before using the unit again to prevent sc...

Page 77: ...power supply after 2 minutes or more pass from operation of 2 Using the remote controller Turn off the power supply 4 Close the water supply valve 5 Fully open all hot water xtures 6 Turn the drain p...

Page 78: ...charge from the drain pipe within 15 minutes of use However depending on the season and or installation site conditions it may take longer If water does not appear at the end of the drain line a quali...

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