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SVC 810 Tankless Troubleshooting Manual

40

Troubleshooting

•

When measuring

resistance

of a part, turn off the electric power and be sure to

disconnect the part completely before measuring (from connector or terminal).
Resistance checks are performed on the part while it is disconnected from the control
board.

•

Electrical checks

are performed with the connectors in place and the unit turned on.

(Indoor Model Only) When performing maintenance and/or servicing the water heater
without front cover, push the air filter switch down. Without pushing it down, Error Code
[21] is displayed.

•

All Molex connections only go to one location and fit one way. You do not need to

force a connection. Connections are also color coded to aid in reassembly.

•

CAUTION

When performing maintenance and/or servicing the water heater, turn off

the electric power, gas shutoff valve and water shutoff valve. Wait for the water heater to
become cool. Be careful to avoid injury on the sharp edges.

•

WARNING

Shock hazard - line voltage is present. Before servicing the water heater,

turn off the electric power to the water heater at the main disconnect or circuit breaker.
Failure to do so could result in severe personal injury or death.

Troubleshooting Format and Example

Yes

No

Yes

If you are not familiar with this format, I will ask
you a series of questions – one question at a time.
You must perform the service check and work thru
the tree based on the Yes or No result of the test.

Does this make sense to you?

This template is used

to troubleshoot error

codes to determine

faulty parts.

Are you familiar with

this format?

No

Good. Proceed to your error code to resolve the
issue. The error codes are listed in the table of
contents.

You are welcome to call our technical
service center at 1-800-432-8373. We
will walk you thru your first error code.
Please have a multimeter with you when
you call. We will not be able to resolve
the error codes on this machine without
a multimeter capable of measuring AC
voltage, DC voltage and OHMS
resistance.

In some cases you will be
asked to perform a test. That
test is contained in a box that
looks like this.

«
...
39
40
41
42
43
...
»

Содержание SVC 810

Страница 1: ...ess Gas Water Heaters Second Generation Indoor Outdoor and Direct Vent Up to 199 000 BTU Includes RTG2 42 RTG53 RTG66 and RTG74 models http waterheatertimer org Troubleshoot Rheem Tankless water heater html ...

Страница 2: ...aximum Temperature Setting to 120 14 Error Codes 15 Diagnostic Points on Printed Circuit Board 18 Thermistor Resistance Chart 19 Fan Speed Chart 20 RTG2 42 21 Wiring Diagram 21 Printed Circuit Board 22 RTG 53 23 Wiring Diagram RTG 53 23 Printed Circuit Board RTG 53 24 RTG 66 25 Wiring Diagram 25 Printed Circuit Board 26 Error Code 11 RTG66 Only 26 Error Code 11 RTG66 Only 27 Error Code 51 RTG 66 O...

Страница 3: ...Code 32 55 Error Code 33 56 Error Code 34 56 Error Code 35 57 Error Code 38 57 Error Code 51 57 Error Code 52 58 Error Code 61 59 Error Code 65 59 Error Code 66 RTG66 Only 60 Error Code 71 60 Error Code 72 60 Error Code 76 61 Error Code 79 61 Error Code 80 81 61 Error Code 82 61 Error Code 90 62 Error Code 99 63 Warning Code IL 63 Warning Code P1 64 Disassembly and Repair 1st Generation 7 4 produc...

Страница 4: ... RTG 74X and GT 199X 80 Before inspecting diagnosing repairing or operating any water heater be sure to examine all of the safety and warning labels on the tank Follow the instruction on these warning labels Read and understand the Use and Care Manual that was shipped with the water heater Failure to do so can result in unsafe operation of the water heater resulting in property damage bodily injur...

Страница 5: ...ent Stainless Steel Venting Category III Max Vent Length See use and care manual for each product type Inlet Gas Pressure Natural Gas Min 4 0 w c Max 10 5 w c L P Gas Min 8 0 w c Max 14 0 w c Factory Setting 100 F With Supplied UMC 117 Main Control 100 F 120 F 140 F Adjusting Range All second generation products will go to 140 F out of the box with DIP switch adjustment Bath control 100 F 120 F Ho...

Страница 6: ...n new chassis n a n a No air filter switch n a n a RTG 53 series Initial Product Launch n a n a No air filter switch n a n a dash one RTG74 Added EZ link function to all similar models EZ link Cable Yes Added UMC Main remote control as standard to all models allowed residential units to heat to 1400 F UMC 117 Main Yes Removed 60 minute lockout timer for return circulation function No Yes Power Res...

Страница 7: ...d to change Programming Chips this is when the 2 chips in a bag started Yes December 5 2006 dash two model RTG 74 chassis only Yes Yes Removed transformer 120v AC is the primary power source to board No Yes Manifold pressure changed No Yes Programming chip changed to reflect new manifold pressures Programming Chips Yes Moved gas inlet connection to outside the chassis for easier replacement No No ...

Страница 8: ...purpose of the flame rods is to verify flame In the event of flame failure or presence when none is expect the unit will go into an error code The In Use Indicator on remote control turns ON Red and the Priority Indicator turns Green multiple remote controls Main Burner is now lit The PCB goes thru a series of calculations input sensing to balance out the cold water temperature the thermostat sett...

Страница 9: ...ture The sensing burner is located in the part of the main burner and designed to monitor the flame condition at all times In case the oxygen level decreases due to blocked or clogged air intake or flue venting or by contaminated air not enough oxygen content location of the flame as well as its temperature will change This change will be detected by the ODSD thermocouple The unit will attempt to ...

Страница 10: ... detect normal ODS thermocouple temperatures then unit will shut down with an error code of 13 NOTE Shutdown by imperfect combustion can be reset by pressing power switch ON OFF Button If shutdown occurs 5 times within 4 hours the water heater will not recover for the next 4 hours How to Reset the Four 4 Hour ODS Timer 1 Turn the unit OFF Remove the front cover Locate the dip switches on the contr...

Страница 11: ... recent 8 faults Null F Null Sequence Number of the most recent 8 faults Null C Total combustion times until recent error fault x 10000times Null D Total combustion times until recent error fault x 100 times Null H Total combustion period until recent error fault x 1000 hours Null J Total combustion period until recent error fault x 10 hours Null Y Flame Rod Status GPM Flow Rate gpm Ambient Air Th...

Страница 12: ...um and 199 900 BTU maximum WARNING You will need to perform this procedure when you replace the PCB or install a new altitude chip Without the adjustment the water heater may not function properly When replacing the printed circuit boards adjust as follows Measurement of Fan Pressure Measure the fan pressure before adjusting the burner manifold pressure The fan pressure differs depending on models...

Страница 13: ...rrent figure 01 39 is displayed on the LED of remote control d You can change the test gas pressure by pushing the SW2 button every time Using the manometer adjust the minimum manifold pressure to the standard pressure plus the measured maximum fan pressure e Release the SW2 button Note If EE is displayed on the LED of remote control adjust again with caution This means there was an error in the a...

Страница 14: ... necessary A different Program chip is required for every 3 280 feet The Program chip is not interchangeable between Indoor and Outdoor models or types of gas 1 Check the altitude above sea level where the water heater is installed 2 Ensure that you have the correct Program chip for proper model gas type and altitude 3 Disconnect the electric power to the water heater Turn off the gas shutoff valv...

Страница 15: ... cover 4 Find the DIP Switch 4 located at the top left hand side of the PCB 5 Change the DIP Switch 4 setting to the ON position DO NOT alter any other DIP Switch 6 The LED on the PCB is flashing At the same time the display of the Main Remote Control starts to flash 7 Press the SW2 Button on the left hand side of the PCB for more than 1 second 8 The LED on the PCB starts illuminating continuously...

Страница 16: ...n off or remove circulation pumps unit is not designed for continuous operation with circulation systems 03 MIC 180 and EZ Link Only Check communications cable Check 4 dip switch setting to ON position 05 Imperfect Combustion Alarm Clean air inlet filter Clean combustion air fan Clean heat exchanger fins Check for adequate combustion air ventilation openings and clean if necessary Check vent syste...

Страница 17: ...ter Switch Indoor Products Only Make sure air filter door is properly seated Make sure front panel is properly installed 24 Malfunction of Operational Switch Disconnect remote control and retry Verify unit is electrically grounded Press max button on PCB to reset Press min button on PCB to reset 29 Heat Exchanger Outlet Temp Too Low Clean air inlet screen Clean heat exchanger fins 31 Water Inlet T...

Страница 18: ...ame rod for damage Check flame rod for proper voltage Remove flame rod and check clean with steel wool 76 Communication Fault with Remote Control Check remote control wiring for loose or damaged connections Bypass remote control cable by connecting remote control directly to remote control terminals on PCB Replace cable if found to be faulty 79 Fan Motor Current Fault Ensure fan motor will turn fr...

Страница 19: ...100 V T B1 GND AC 1 100 V Are the three flame rods detecting flame Flame Rod 1 is the white wire and goes to the right front half burner Flame Rod 2 is the red wire and goes to the right rear half burner Flame Rod 3 is the blue wire and goes to the left burner 74 series only H GY2 GY5 AC 90 110 V Is the igniter working properly All models except RTG66 These are the two green wires at connector H T...

Страница 20: ...87 8 6 781 132 8 2 863 177 8 1 345 44 6 17 525 89 6 6 536 134 6 2 773 179 6 1 307 46 4 16 799 91 4 6 302 136 4 2 686 181 4 1 271 48 2 16 108 93 2 6 076 138 2 2 602 183 2 1 236 50 15 449 95 5 86 140 2 52 185 1 202 51 8 14 82 96 8 5 653 141 8 2 442 186 8 1 169 53 6 14 221 98 6 5 454 143 6 2 367 188 6 1 137 55 4 13 469 100 4 5 264 145 4 2 295 190 4 1 106 57 2 13 104 102 2 5 081 147 2 2 225 192 2 1 07...

Страница 21: ...SVC 810 Tankless Troubleshooting Manual 20 Fan Speed Chart ...

Страница 22: ...SVC 810 Tankless Troubleshooting Manual 21 RTG2 42 Wiring Diagram ...

Страница 23: ...SVC 810 Tankless Troubleshooting Manual 22 Printed Circuit Board ...

Страница 24: ...SVC 810 Tankless Troubleshooting Manual 23 RTG 53 Wiring Diagram RTG 53 ...

Страница 25: ...SVC 810 Tankless Troubleshooting Manual 24 Printed Circuit Board RTG 53 ...

Страница 26: ...SVC 810 Tankless Troubleshooting Manual 25 RTG 66 Wiring Diagram ...

Страница 27: ... The RTG 66 PCB has two set of dip switches Dip Switch set 2 controls the high altitude settings See the use and care manual for instructions The procedures for changing the maximum temperature set point have also changed See the use and care manual for instructions ...

Страница 28: ... not condone the use of flex line gas piping with tankless Scenario 1 Error Code 11 fan is operating igniter does not spark Scenario 2 Error Code 11 fan is operating igniter does spark main burner does not ignite Yes Replace Igniter Assembly Replace Printed Circuit Board Does the igniter have voltage No Yes Is the igniter electrode clean Is the electrode damaged Is wiring intact No Clean replace i...

Страница 29: ... voltage No Yes Measure the voltage of connector K between Black and Red wires 90 to 120 VDC Replace Printed Circuit Board Does the Solenoid Valve 3 have a voltage No Yes Measure the voltage of connector K between Black and Blue wires 90 to 120 VDC Replace Printed Circuit Board Does the P G F R valve have a voltage No Yes Measure the voltage of connector R between Black 2 and Red 1 wires 1 5 to 14...

Страница 30: ...as Control Assy Is the resistance of the Proportional Gas Control Valve OK No Yes Measure the resistance of connector R between Black 2 and Red 1 wires 40 to 80 Ohms Replace Gas Control Assy Check or replace main burner Is the resistance of the Solenoid Valve 3 OK No Yes Measure the resistance of connector K between Black and Blue wires 0 8 to 2 4k Ohms Replace Gas Control Assy Is the resistance o...

Страница 31: ...0 VAC Clean or replace main burner and Flame Rod Electrode Try to ignite main burner Display maintenance information 0y Is there any flame current Yes Refer to Error code 12 procedures Replace Printed Circuit Board Flame Rod Status X not detecting flame O is detecting flame 0y display 00 01 Flame Rod 1 white X O Flame Rod 1 is the white wire at connector M and goes to the burner Normal flame rod s...

Страница 32: ... and then display maintenance information 0y Does the 0y display indicate any remaining flame No Clean or replace Main Burner and Flame Rod Electrodes Replace Printed Circuit Board Yes Flame Rod Status X not detecting flame O is detecting flame 0y display 00 01 Flame Rod 1 white X O Flame Rod 1 is the white wire at connector M and goes to the burner Normal flame rod status in the control panel wit...

Страница 33: ...r Replace Fan Assembly Is there any pulse output from the Fan Motor To measure the pulse output turn on the fan by pushing MAX SW2 Button Measure the voltage of connector G between Blue and Yellow wires 4 to 10 VDC pulse Replace Printed Circuit Board Measure the voltage at connector C between the Red 7 and Black 8 wires for 8 to 16 VDC Measure the voltage at connector C between the White 2 and Bla...

Страница 34: ...to the water control and connector B on the Printed Circuit Board Measure the voltage at connector B between the Red 7 and Black 8 wires for 8 to 16 VDC Measure the voltage at connector B between the Red 7 and Black 8 wires for 8 to 16 VDC Is the voltage to the water by pass control OK Yes No Replace the Printed Circuit Board Turn power off unplug unit and then on again When motor operates is the ...

Страница 35: ...SVC 810 Tankless Troubleshooting Manual 34 RTG 74 Wiring Diagram RTG 74 A wiring diagram is also located on the inside of the front cover panel ...

Страница 36: ...SVC 810 Tankless Troubleshooting Manual 35 Printed Circuit Board RTG 74 ...

Страница 37: ...wire at each end These cables may be plugged in either way The other manifolding process uses the MIC 180 control panel to connect up to 20 tankless units at a time These communications cables come in multiple lengths and have one end of the cable with a single red white and black wire These cables must be plugged in a certain way for the system to communicate properly Plug the 3 wire end into the...

Страница 38: ...IP switch 3 By pressing the SW2 button located below the LED display on the main communication PCB the number of the water heater to be tested can be selected The left two digits flashing on the LED display of the main communication PCB indicates the number of the water that has been selected Conduct continuity check of the communications cable Did the unit go to main burner Yes No Replace the Pri...

Страница 39: ...per digits of the number of occurrence of combustion at the time of error n times ago X10000 Not in use d Lower digits of total times of combustion Lower digits of the number of occurrence of combustion at the time of error n times ago X100 Not in use H Upper digits of total duration of combustion Upper digits of the duration of combustion at the time of error n time ago X1000 Not in use J Lower d...

Страница 40: ...it 8 When the water heater unit number 00 is assigned the Control Board main body will display the maintenance mode The upper portion of the maintenance address can be selected with SW2 and the lower with SW3 9 When the DIPSW 1 and 3 are switched to the OFF position the Maintenance Information Mode will end 2nd Generation Flame Rod Chart Flame rod chart is different for second generation 4 2 and 5...

Страница 41: ...p edges WARNING Shock hazard line voltage is present Before servicing the water heater turn off the electric power to the water heater at the main disconnect or circuit breaker Failure to do so could result in severe personal injury or death Troubleshooting Format and Example Yes No Yes If you are not familiar with this format I will ask you a series of questions one question at a time You must pe...

Страница 42: ...nd verify zero flow rate If there is ANY flow rate at 1Y the unit will not power on Will the unit go into Maintenance Mode Yes Check voltage at wall plug and circuit breaker for acceptable levels Repair as required This is not a water heater issue This is an electrical issue Is there voltage at the wall plug No Plug unit into a grounded 3 prong wall plug Verify hard wire to unit if applicable Veri...

Страница 43: ...ion box of the water heater between the black and white wires at 108 132 VAC Measure the voltage of the two red wires on the bottom right of the PCB 90 110 VAC Second Generation 4 2 5 3 and 7 4 series have black and white wires for this test You will also see a true 120 volts The second generation 4 2 5 3and 7 4 series units don t have transformer Yes Replace 5 amp fuse Is there power to the Print...

Страница 44: ...o check The pick up sensor in the water flow control may be bad or the board may be bad Try this test Check connector S between the Red and Black With the unit ON and no water flow you should be 11 15 DC volts If not replace the PCB IF you have voltage then With the water flowing measure 2 5 DC volts between the Brown and Black wire This is measuring water flow thru the control IF you have a readi...

Страница 45: ...a minimum check the following in all cases 1 Clean air inlet filter 2 Check for adequate combustion air ventilation openings 3 Check and clean combustion air fan Unit will shut down automatically after 60 minutes of continuous use Turning off the hot water will reset the timer Turn off or remove circulation pumps Unit is not designed for continuous operation with circulation systems Replace Circui...

Страница 46: ...leshoot At a minimum check the following in all cases 7 Ensure you have gas to the appliance 8 Bleed all air from gas lines 9 Ensure appliance is properly grounded 10 Ensure gas line meter and regulator are sized properly 11 Ensure gas type and gas pressure to the machine is correct 12 Flex lines with a full 3 4 inch inside diameter may also restrict fuel flow enough to give you error code 11 We d...

Страница 47: ...ve 1 have a voltage No Yes Measure the voltage of connector K between Black and White wires 90 to 120 VDC Replace Printed Circuit Board Does the Solenoid Valve 2 have a voltage No Yes Measure the voltage of connector K between Black and Red wires 90 to 120 VDC Replace Printed Circuit Board Does the Solenoid Valve 3 have a voltage No Yes Measure the voltage of connector K between Black and Blue wir...

Страница 48: ... Control Assy Is the resistance of the Solenoid Valve 2 OK No Yes Measure the resistance of connector K between Black and Red wires 0 8 to 2 4k Ohms Replace Gas Control Assy Is the resistance of the Solenoid Valve 3 OK No Yes Measure the resistance of connector K between Black and Blue wires 0 8 to 2 4k Ohms Replace Gas Control Assy The 2 4 2 and 5 3 units only have two stages of burner Skip the n...

Страница 49: ... procedures Replace Printed Circuit Board Flame Rod Status X not detecting flame O is detecting flame 0y display 00 01 02 03 04 05 06 07 Flame Rod 1 white X O X O X O X O Flame Rod 2 red X X O O X X O O Flame Rod 3 blue X X X X O O O O Note Notice the colors of the wires to the gas valve solenoids are the same color as the respective flame rods Flame Rod 1 is the white wire and goes to the right f...

Страница 50: ...achine is correct 5 Flex lines with a full 3 4 inch inside diameter may also restrict fuel flow enough to give you error code 11 For convenience the RTG 66 model has a inch inlet gas pressure check port on the gas connection nipple Natural Gas Pressure L P Gas Pressure Adjust inlet gas pressure based on fuel type Does the unit have proper inlet gas pressure No Yes Adjust burner manifold pressure S...

Страница 51: ...DS failure and never tries to correct itself with the 05 code 5 If so a Recycle power and go to maintenance mode b Go to cell ØA c Verify Ø voltage present that is the correct reading when main burner is off d Press the ON OFF button to go to main burner Turn on a water faucet e Run the unit for at least 3 minutes and watch the display cell ØA f If you get between8 mv and 30 mv then the ODS and bu...

Страница 52: ...the PCB requires You can verify this at cell ØA in maintenance mode Error Code 14 Explanation Overheat Film Wrap has activated There may be a hot spot on the heat exchanger that has caused the overheat film wrap to fault At a minimum check the following 1 Check gas type of unit and ensure it matches gas type being used 2 Check heat exchanger for cracks and or separations 3 Check for restrictions i...

Страница 53: ...exchanger thermistor OK Measure the resistance of connector R between Black 3 and Yellow 5 wires 4k 10 k ohms Display maintenance information line 4y Heat Exchanger Thermistor temperature If 4Y displays 199 F then physically check heat exchanger Remote cannot display over 199 F If actual temperature reaches 207 F for 15 seconds Error code 15 displays Unit will re start at 194 F If actual temperatu...

Страница 54: ...ur retaining screws 3 Press the air intake switch when operating the unit without the front cover installed Yes The water heater appears to be normal Attempt to operate again Check the water flow servo especially the cold water bypass solenoid for operation Check for blockage in the cold water bypass piping Does the maintenance information indicate the hot water outlet temp No Is the resistance to...

Страница 55: ...nation Heat Exchanger outlet temperature is too low At a minimum check the following 1 Clean air inlet filter 2 Check for buildup on the heat exchanger fins 3 Set thermostat to 120 degrees Verify heat exchanger temperature with water at hot outlet Unit appears to be OK Reset unit and attempt to operate without pushing the Min Max SW1 SW2 Buttons Does the unit operate by pushing either the Min or M...

Страница 56: ...nctioned At a minimum check the following Yes The water heater appears to be normal Attempt to operate again Yes Is the resistance to the water inlet thermistor OK Measure the resistance of connector R between Black 3 and White 6 wires 7k 790 F 19 k 380 F ohms Display maintenance information line 3y Water Inlet Thermistor temperature No Replace Water Inlet Thermistor Replace Printer Circuit Board ...

Страница 57: ...oned At a minimum check the following Yes Yes Yes The water heater appears to be normal Attempt to operate again Is the resistance to the hot outlet thermistor OK Measure the resistance of connector R between Black 3 and Red 4 wires 4k 19 k ohms Display maintenance information line 5y Water Inlet Thermistor temperature No Replace Hot Outlet Thermistor Replace Printer Circuit Board Yes Does the mai...

Страница 58: ...rst resolution Error Code 38 Explanation Oxygen Depletion Sensor has malfunctioned The sensor itself is not responding to the printed circuit board At a minimum check the following 1 Check sensor wiring and Molex connections at connector Q Error Code 51 Explanation Gas Inlet Solenoid Valve fault At a minimum check the following 3 Check gas valve wiring harnesses for loose or damage terminals 4 Che...

Страница 59: ...Not detecting flame O is detecting flame The water heater seems to be normal Try to operate again Does the 0y display indicate any remaining flame Pull out the relay connection of flame rod connectors M L T and then display maintenance information 0y Does the 0y display indicate any remaining flame No Clean or replace Main Burner and Flame Rod Electrodes Replace Printed Circuit Board Yes Replace P...

Страница 60: ...or B on the Printed Circuit Board No Yes Yes The water heater appears to be normal Attempt to operate again Does the Fan Motor have sufficient voltage Measure the voltage of connector G between Blue and White wires 120 to 160 VDC If you accidentally cross the BLUE and WHITE wires with your multimeter leads you will short out the circuit board and the fan motor No Replace Printed Circuit Board Yes ...

Страница 61: ...me when there is not suppose to be any flame See and follow the same procedure as used in Error Code 51 Measure the voltage at connector B between the White 2 and Black 8 wires for 8 to 16 VDC Yes When motor operates is the voltage to the water control OK No Replace the Printed Circuit Board Replace the Water Control Assembly Replace G I S V Valve Is there power to the G I S V valve Yes No Replace...

Страница 62: ...80 81 Explanation Gas Cut off Failure Extinction Failure See and follow the same procedure as used in Error Code 51 Error Code 82 Explanation Gas Type Control Data Failure Printed Circuit Board data failure The PCB has not been programmed lost its programming or has failed At a minimum check the following 3 Check for the presence of the program chip installed on the PCB 4 If the unit has operated ...

Страница 63: ...tal vent length and elbows do not exceed allowable limits 3 Check heat exchanger flapper valve at vent connection of water heater moves freely 4 Is the entire vent structure clear and clean of any obstructions 5 Remove all obstructions Check the vent termination on the outside of the building and the flapper valve at the top of the heat exchanger 6 You may rule out the venting by temporarily disco...

Страница 64: ...nstructions 4 Connect temporary fittings with barb fittings on one side and union on other side to the inlet and outlet water connections 5 Connect the pump hose outlet hose to the barb fitting at the cold water inlet fitting 6 Connect the drain hose to the barb fitting at the hot water outlet fitting 7 Pour approximately 5 gallons of virgin food grade white vinegar into a pail 8 Place the pump or...

Страница 65: ...ake sure you have a good diagnosis Remove only the parts needed 4 Handle all parts carefully 5 When reassembling prevent any foreign substance i e dust etc from being introduced into the water heater 6 After reassembling check for gas and water leakage Then test ignition Make sure that there is no gas leakage in connections by testing with soap bubble solution Bubbles indicate a gas leak that must...

Страница 66: ... Remove four screws on the cold water inlet connector outside bottom of unit f Note the connector has a rubber o ring and metal gasket to seal the connection g Remove two spring clips on cold water bypass pipes h Remove three freeze protection plugs i Remove cold water inlet thermistor j Remove water flow sensor k Disconnect the solenoid motor Molex l Remove Water Control Solenoid m Note the water...

Страница 67: ...e screws on hot water outlet connector outside bottom of unit f Gently pull outlet pipe from connector and move to one side g Unscrew and remove drain valve h Rotate and remove hot water outlet thermistor from the unit i Remove outlet connector and retaining plate 5 Transformer a Step 1 3 4 and b Remove the two screws holding the transformer to the back wall of the unit c Disconnect power lead Mol...

Страница 68: ...5 Fan Assembly a Step 1 and b Clip plastic tie holding Ambient Air Thermistor c Disconnect Fan Assembly Molex d Loosen wire clip holding the wire bunch in place e Remove three screws one outside bottom one inside back left one inside back right ...

Страница 69: ...etaining clips and crews from the manifold supply tubes d Note that each manifold tube has a rubber o ring on each end to seal the tube e Remove the three screws from the gas valve connector outside bottom f Remove the Proportional Gas Flow Regulator from the unit g Disconnect all Molex connections Note the three connections on the top of the valve are color code Blue White and Red They MUST be re...

Страница 70: ... the tube d Remove the two screws that hold the igniter mounting plate e Remove the remaining 16 screws on the perimeter of the burner cover plate f Remember to re connect the green and yellow striped ground wire when reassembling cover plate 8 Burner Assembly a Step 7 and b Remove the three screws on the bottom back wall of the burner assembly c Firmly pull on both sides of the burner assembly to...

Страница 71: ...eramic probes f Reseat black rubber plugs to prevent wires from pinching on metal 9 Flame Rod s a Step 7 and 8 and b Remove the two screws that hold the right hand flame rod white wire on the front of the burner chassis c Remove the four screws that hold the back side flame rods Blue and red wire on the burner chassis Rear shown here Red flame rod is on the left blue is on the right 10 Heat Exchan...

Страница 72: ...ture Water Flow Inlet Valve Cold water inlet valve that measures water temperature and detects flow in gallons per minute Oxygen Depletion Sensing Device indoor models only Safety device that detects improper combustion fuel air mixture and attempts to fix it Proportional Gas Flow Regulator Valve P G R F Gas valve that modulates and only allows the amount of fuel needed to heat the water being use...

Страница 73: ...at exchanger and ambient air Shown is the cold water inlet thermistor Hot water Outlet Valve Valve that delivers the hot water to the piping system and measure the hot water outlet temperature with the aid of a thermistor Gas Inlet Connection Connection port separate from the gas valve to connect the incoming gas supply Shown with supplied shut off valve PCB Printed Circuit Board The control board...

Страница 74: ...from inside the machine Fan Assembly Fan blower motor that draws fresh air into the machine and mixes it with the fuel for burning in the combustion chamber Burner Assembly Burner component that ignites the fuel air mixture and provides heat for the heat exchanger Water Filter In line filter on the cold water inlet assembly that filters out trash and sediment Program Chip Removable electronic chip...

Страница 75: ... Flame Rod Ignitor Electrode Flame Rod Wire 4 Ignitor Coil 5 Fan Assembly 6 Burner Manifold 7 Gas Inlet Connector 8 Water Control Valve Inlet Thermistor White 9 Water Inlet Connector 3 4 10 Inlet Water Filter 11 Hot Outlet Connector Outlet Thermistor Black Drain Relief Valve 13 Door Filter Screen N S Heat Exchanger Thermistor Yellow N S Ambient Thermistor Blue PV Power Vent not Direct Vent N S Not...

Страница 76: ...ssembly Flame Rod Flame Rod Wire Igniter Electrode 4 Ignitor Coil 5 Fan Assembly 6 Burner Manifold 7 Gas Inlet Connector 3 4 8 Water Control Valve Inlet Thermistor White 9 Water Inlet Connector 3 4 10 Inlet Water Filter 11 Hot Outlet Connector 3 4 Outlet Thermistor Black Drain Relief Valve N S Heat Exchanger Thermistor Yellow N S Ambient Thermistor Blue X Outdoor Model N S Not Shown ...

Страница 77: ...y Flame Rod Flame Rod Wire Igniter Electrode 4 Ignitor Coil 5 Fan Assembly 6 Burner Manifold 7 Gas Inlet Connector 3 4 8 Water Control Valve Inlet Thermistor White 9 Water Inlet Connector 3 4 10 Inlet Water Filter 11 Hot Outlet Connector 3 4 Outlet Thermistor Black Drain Relief Valve N S Heat Exchanger Thermistor Yellow N S Ambient Thermistor Blue DV Indoor Direct Vent Model N S Not Shown ...

Страница 78: ...fold LP Burner Manifold NAT 4 Sensor Orfice LP 4 Sensor Orifice NAT Ignitor Coil 5 Ignitor Electrode Ignitor Electrode 8 Blower Motor 8a Blower Case 9 Water Control Valve 14 Water Bypass Valve Water Inlet Connector 3 4 Remote Control Terminal Block 10 Terminal Block Wire Assy 11 Screw Pan FT 4x12 Inlet Water Filter Hot Outlet Connector Door Screw Chassis Screw Mounting Brackets Only fuel specific ...

Страница 79: ...urner Assembly Ignitor Electrode Flame Rod Flame Rod Wire 4 Ignitor Coil 5 Fan Assembly 6 Burner Supply Tubes 7 Gas Inlet Connector 3 4 8 Water Control Valve Inlet Thermistor White 9 Water Inlet Connector 3 4 10 Inlet Water Filter 11 Hot Outlet Connector Outlet Thermistor Black Drain Relief Valve 12 Door Switch 13 Door Filter Screen N S Heat Exchanger Thermistor Yellow N S Ambient Thermistor Blue ...

Страница 80: ...urner Assembly Ignitor Electrode Flame Rod Flame Rod Wire 4 Ignitor Coil 5 Fan Assembly 6 Burner Supply Tubes 7 Gas Inlet Connector 3 4 8 Water Control Valve Inlet Thermistor White 9 Water Inlet Connector 3 4 10 Inlet Water Filter 11 Hot Outlet Connector Outlet Thermistor Black Drain Relief Valve 12 Door Switch 13 Door Filter Screen N S Heat Exchanger Thermistor Yellow N S Ambient Thermistor Blue ...

Страница 81: ...e 3 Burner Assembly Ignitor Electrode Flame Rod Flame Rod Wire 4 Ignitor Coil 5 Fan Assembly 6 Burner Supply Tubes 7 Gas Inlet Connector 3 4 8 Water Control Valve Inlet Thermistor White 9 Water Inlet Connector 3 4 10 Inlet Water Filter 11 Hot Outlet Connector Outlet Thermistor Black Drain Relief Valve 12 Door Switch 13 Door Filter Screen N S Heat Exchanger Thermistor Yellow N S Ambient Thermistor ...

Страница 82: ...Rheem Water Heating Ruud Water Heating 1241 Carwood Court Montgomery AL 36117 1 800 432 8373 www rheemtankless com Printed in the U S 08 08 Form No SVC810 ...

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