Continuum and Integrity REU2532-W and REU2532-WC Series Water Heaters SERVICE MANUAL Rinnai Corporation 103 International Drive Peachtree City, Ga. 30269 Telephone number (800)621-9419 No portion or part of this manual may be copied without prior permission from Rinnai Corporation.
Key to Warning Symbols Failure to comply with the following instructions may results in serious personal injury or damage to the appliance. Be careful of possible electric shock. Wiring inside this appliance may potentially be at 120 volts. Disconnect power supply to unit when carrying out the following service repairs. Read Fault Diagnosis and Wiring Diagram carefully to avoid incorrect wiring. Do not disassemble. Parts within can not be exchanged or diagnosed faulty.
Table of Contents Glossary of Terms and Symbols .............................................................................................................. 4 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. Introduction .................................................................................................................................. 5 Features ...............................................................................................
Glossary of Terms and Symbols This glossary of terms and symbols is provided to assist you in understanding some of the language used throughout this manual. DB(A) DC AC WFCD FB Hz. IC BTU/H PSI LED GPM mA W.C.
1. Introduction The brand name Continuum refers to “Endless Hot Water”. The new Continuum series has been developed in response to the growing changes in the lifestyle of our customers, and the increasing diversification and sophistication of demand in the marketplace. The Continuum series offers reduced cost with advanced safety features, and an option to connect one, two, or three remote temperature control pads to the residential units. The commercial units only allow one keypad per heater.
2. Features Installation The lightweight, slim, compact design enables ease of installation and improved appearance. The remote controls (where fitted) are connected to the appliance by (2) core non-polar cable, or low voltage thermostat wire, ensuring easy wiring and eliminating problems of mis-connections. Since the remotes use a 12 VDC digital signal, there’s no-way you can cross up the wiring.
Water Temperature Control With an “MC” remote control connected, the hot water control range at the key pad is 96 – 140 °F. The “BC” and “BSC” key pads allow for adjustments between 96 – 120 °F. The “MCC” key pad allows the commercial unit to be adjusted from 96 – 180 ° F. This allows the Continuum to be set to comply with various State codes pertaining to maximum water temperatures allowed for homes, child care centers, elderly care centers, etc.
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4. Installation Piping recommendation.
5. Remote Controls The MC45-4US, BC45-4US, BSC45-4US , and the MCC45-4US remote key pads were specifically designed for use with the Continuum water heaters. Features include: Color coordination to allow immediate recognition of the temperature “hot” and “cold” buttons. Large LED display. Temperature adjustments in two degree increments from 96 – 110 °F, then two five degree increments from 110 – 115 °F , and 115 °F - 120 °F , on the BC, BSC and MC controllers.
6. Suggested Connection Methods for Remotes There must be at least one cable from the remote control(s) connected to the Continuum water heater. Power for the remote(s) is supplied from the PC board. On the front of the PCB, there are two screws labeled terminals for controls. This is the 12VDC digital power supply for the remotes. Use low voltage thermostat wire when wiring up the keypads.
7. Safety Devices Flame Failure Situated to the right of the burner in the front of the combustion chamber, the flame rod monitors the combustion process. This sensor monitors the flame intensity, while the PCB compares this signal to the feed back signal from the combustion fan motor, water flow control, and gas flow through the POV valve. If any one of the feedback signals are incorrect, the unit will shut off, preventing discharge of gas to the burner.
5 °F Over temperature Cut-Off The temperature of the outgoing hot water is constantly monitored by the water temperature thermistor located near the outlet of the appliance. If the outgoing water temperature reaches 5 °F above the preset temperature, the burner will automatically go out. The burner will only ignite again once the outgoing hot water temperature falls below the preset temperature.
8. SPECIFICATIONS Type of appliance Operation Exhaust system Rinnai model number Maximum/Minimum gas rate (Input Btu’s) Thermal Efficiency Energy Factor (EF) Capacity (Gallons 1st.
Specifications cont. Power Supply Safety Devises Remote control Remote control cable Clearances from combustibles Clearances from non combustibles Appliance – 120 Volts A.C. – 60 Hz. Remote control 12 volt D.C.
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11. Combustion Specifications Model: REU-2532W Series Item Gas Type Gas consumption Injector Diameter Main Burner Main Damper Gas Pressure Supply/Manifold REU-2532W Series Natural Propane Minimum Btu’s Maximum Btu’s Upper Lower 15,000 15,000 199,000 199,000 Ø1.15 Ø0.75 Ø1.8 Ø1.15 B3A7-1 (Lean and Rich Bunsen Burner) H73-115 (Upper: Ø6, Lower: Not Used) Minimum Supply 6” W.C. 10” W.C. Maximum Supply 10.5” W.C. 13.5” W.C. Minimum Manifold 0.56” W.C. 0.88” W.C. Maximum Manifold 3.4” W.C. 5.1” W.C.
12. DIP SWITCHES Contact Rinnai for dip switch settings when changing PC board or setting up unit for special applications. Failure to set dip switches to the proper position will result in damage to the unit, property damage, personal injury or death. DO NOT, adjust dip switches unless you have written permission from Rinnai. Call 1(800)621-9419 to set-up a special training class pertaining to dip switch functions.
(Switches 3,4, & 5) Temperature Adjustment Switches. Switches #3, 4, and 5 are used to set fixed temperatures with or without the remote keypads. Contact Rinnai for dip switch settings when changing the unit’s PC board or setting up special applications. Failure to set dip switches to the proper position will result in damage to the unit, property damage, personal injury or death. DO NOT, adjust switches unless you have written permission directly from Rinnai.
Rinnai Continuum and Integrity Water Heaters Dip Switch Default Settings The settings below are factory default settings. Please ensure the model number and gas type of the unit you have, matches the model number and gas type listed below; before settings any switches. If you need assistance, contact Rinnai at (800)621-9419 before proceeding.
13. Water Flows A simple calculation of the water flow rate, in gallons per minute, can be made using the chart on the next page, or simply using formula provided below. The chart on the following page indicates the water flow from the Continuum at various temperature rises up to a 140 degree rise. a. How to read the charts: The vertical plane indicates water flow in gallons per minute, and the horizontal plane indicates the temperature rise. The chart shows flow rates up to a 140 degree rise.
Unmixed Water Flows for REU-2532 Series The chart below can be used to determine water flow rates in “gallons per minute” at a given temperature rise. In order to figure flow rates, you need the following information; requested water temperature and inlet water temperature. Next, subtract the inlet water temperature from the requested temperature to get your delta T or temperature rise. Then, locate your temperature rise at the bottom of the chart.
14. Main Components 1. Mechanical Water Regulator Rinnai’s unique water regulator mechanism ensures the hot water is maintained with no noticeable change to the desired temperature during use, even if water pressure drops due to another tap being turned on and increasing the demand. The following graph shows that maximum flow is approximately 8.5 gallons per minute for the Continuum. This maximum flow is reached at 29 PSI inlet pressure respectively. 2.
5. Combustion Fan Air for the combustion is supplied by a centrifugal fan driven by a DC motor. After a pre-purge period of 0.2 seconds, the fan speed is controlled by the PCB to provide the correct volume of air for combustion. The calculation for the fan speed is based upon incoming water temperature, water flow and the temperature selected on the remote controls. The actual speed of the motor is continuously monitored by a magnetic pulse sensor. This sensor emits (4) pulses per rotation of the fan.
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REU-2532W Series 27 Rinnai
16. Operation Flow Principle Check power supply 1 Fuses/electrical circuit operational Eliminate cause Disconnect power supply No Yes 2 Remote control indicates no flow OFF Remote control signal normal? No Yes ON/OFF Switch ON/OFF switch ON Error display OFF Set Temperature displayed Water flow sensor stopped A Hot water tap open Hot water tap closed Error code displayed on remote 3 water flow greater than 0.
B C Flame detected (1 micro amp or g re ater) D Yes Ignition failure (3 a ttempts) No No 11 Flashing No Combustion 12 Flashing 10 Flashing 32 Flashing 61 Flashing 10 Flashing Flame failure (less than 1 micro amp) Water temperature over 200 degrees Thermistor faulty (open or short-circuit) Combustion fan rpm's abnormal Flue restriction or block Yes Sparker OFF Combustion proved Gas solenoid open 14 Flashing 12 Flashing 52 Flashing 71 Flashing Check grounding, venting, and gas pressu
17. Operation Principles The preset temperature is selected at one of the remotes controls (where fitted). Where no remote control is fitted , the default temperature can be set at 108, 120, 130, 140, 150, 160, 170, or 180 °F. To select one of the above temperatures as your default setting, you MUST obtain written permission and training from Rinnai. This function may not be allowed at temperatures above 120°F for safety reasons.
When the hot water tap is turned off, the water flow sensor stops revolving, and the magnetic pulse ceases, indicating to the PCB that there is no water flowing, in turn the PCB closes the gas valves. The combustion fan continues to operate for 65 seconds. This is to provide quicker ignition when the tap is turned on and off in rapid succession, as it removes the need for a pre-purge cycle and allows the burner to re-light immediately when a hot water tap is opened again.
18. Error Codes Error Faulty Remedy 10 Air Supply or Exhaust Blockage 11 No Ignition 12 Flame Failure 14 Thermo Fuse 16 Over Temperature Warning Check intake and exhaust ports for obstructions. Check that nothing is blocking the flue inlet or exhaust. Did you maintain the proper clearance from combustibles around the unit? Ensure you have gas to the appliance. Ensure gas type and pressure is correct. Bleed all air from gas lines. Verify dip switches are set properly.
32 Outgoing Water Temperature Sensor Faulty 33 Heat Exchanger Outgoing Temperature Sensor Faulty 34 Combustion Air Temperature Sensor Faulty 52 Modulating Solenoid Valve Answer Abnormal 61 Combustion Fan Failure 71 SV0, SV1, SV2, and SV3 Solenoid Valve Circuit Faulty Flame Sensing Device Faulty 72 LC Scale Build-up in Heat Exchanger No code Nothing happens when water flow is activated. REU-2532W Series Check sensor wiring for damage. Ohm out sensor Check and clean scale from sensor.
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22. Electrical Component Analysis Before carrying out checks marked with a # sign, disconnect power supply. Unit’s wiring diagram can be found on page 35. Appliance fails to operate (even remote control fails to operate). 1) Is the fuse blown Check fuse. Fuses are located in plastic holders in the main harness, on the lower right hand side of the appliance. a. Disconnect unit from power supply. b.
3) Is the remote control normal ? Check voltage between the two remote control cable connectors. a. Check the voltage between terminals on the remote control terminal mount D1. Normal: 11 ~ 13 VDC If normal, check for an open circuit or short before replacing the remote control. Faulty: Replace PCB. No combustion (despite remote control indication) 1) Is the water flow sensor normal ? Check the water flow sensor. a. Check the voltage at PCB connector B4, red and black wires. Normal: 11 ~ 13 VDC or 5.
2) Is the flame rod normal ? Error “72” is displayed Checking the flame rod. a. # Detach the flame rod terminal C1, and re-attempt operation. (“72 is displayed) Proceed to check item 3 below. (no “72” displayed) Inspect flame rod wiring for current leak and inspect flame rod for carbon build-up. Measure resistance between the flame rod Terminal C1 and the appliance earth. Normal: 1 MΩ or more. If normal, replace the PCB unit. Faulty: Replace the flame rod.
4) Is the combustion fan motor normal ? Motor check. If error “61” is displayed, check the combustion fan. a. Measure voltage at connector A1. Black and red wires. Normal: 6 ~ 45 VDC (Fan on) 0 VDC (Fan off) If normal, check item b below. Faulty: Replace the PCB unit. Fan revolution sensor check. b. Measure voltage at connector A1, black and yellow wires. Normal: 11 ~ 13 VDC or 3.1 ~ 3.7 KΩ If normal, check item c below. Faulty: Replace the PCB unit. c.
6) Is the main gas solenoid valve (SV0) operating normally ? If error “11” or “71” is displayed, check the main gas solenoid valve. a. # Disconnect the main gas solenoid valve (SV0) connector and measure the resistance at the solenoid terminals. Normal: 1.7 ~ 2.1 KΩ If normal, check b below. Faulty: Replace the main gas solenoid valve. b. Measure voltage at the main gas solenoid (SV0) Pink and black wires. Normal: 80 ~ 100 VDC If normal, proceed to check item 7 below. Faulty: Replace PCB unit.
9) Is the change over solenoid (SV3) operating normally? If error “11” or “71” is displayed, check the change over solenoid (SV3). a. # Disconnect the changeover solenoid (SV3) connector, and measure the resistance at the solenoid terminals. Normal: 1.7 – 2.1 KΩ If normal, check b below. Faulty: Replace the changeover solenoid (SV3). b. Measure the voltage at the changeover solenoid (SV3), brown – black wires. Normal: 80 – 100 VDC If normal, reconfirm gas pressures are correct..
Error code “14” Check the thermal fuse. a. # Disconnect connector B3 and C3, measure the resistance between the red – red wires. Normal: Less than 1Ω If normal, check b below. Faulty: Check manifold gas pressure. Check heat exchanger for cracks and/or separations. If there is nothing abnormal, replace the thermal fuse. b. Check bi-metal switch, (remaining flame safety device). Measure resistance between the two terminals at B3 and C3. Normal: 100 – 120 VAC If normal, process to item a below.
Unable to adjust hot water temperature 1) Is the water temperature thermistor operating normally ? a. # Disconnect the connector B5, and measure the resistance between the white wires, see below for resistance readings. Thermistor resistance valves: 59 ºF = 11.4 ~ 14 KΩ 86 ºF = 6.4 ~ 7.8 KΩ 113 ºF = 3.6 ~ 4.5 KΩ 140 ºF = 2.2 ~ 2.7 KΩ 221 ºF = 0.6 ~ 0.8 Ω Normal: Proceed to check item 2 below. Faulty: Replace the water temperature thermistor. 2) Is the change over solenoid (SV1) normal ? a.
3) Is the modulating valve operating normally ? Error code 52 a. # Disconnect the modulating valve festoon C2 terminals and measure the resistance at the terminals. Normal: 67 ~ 81 Ω If normal, check b. Faulty: Replace modulating valve. b. Re-connect terminal C2 and measure voltage across the pink ~ pink wires when the unit is firing. Normal: 2 ~ 15 VDC If normal, check c below. Faulty: Replace the PCB unit. c.
Anti-frost heaters do not operate 1) Are the ceramic anti-frost heaters OK ? a. # Disconnect connector F4, and measure the resistance of the heater mounted in the water flow control valve, these are white wires. Disconnect connector F5, and measure the resistance of the heater in the outlet line connector See connectors in the first and second picture to the left. Normal: 348 ~ 375 Ω If normal, proceed to b. Faulty: Replace defective element. b.
23. ELECTRICAL COMPONENT ANALYSIS Nature of Fault A. The LED on the remote control does not light up, when the system is powered up Examination Point 1. Do you have voltage to the unit? Diagnostic Point Inspect visually Values Y/N Action Do you have 120 VAC at the power supply? Yes Go to A – (2) No Plug in cord Yes No Yes Go to A – (3) Check power supply circuit. Check fuses. Go to A – (4) No Go to A – (5) Yes Go to A – (5) and replace fuse. Go to A – (6) 2.
Nature of Fault Examination Point Diagnostic Point 2. Measure the voltage at connector F with appliance power supply on. Values Y/N Are valves within those specified at left. Yes Go to A – (7) No Replace transformer 8 Yes 9 No Check cable for shorts or broken wires. Replace remote control Replace PCB. Yes Go to B–1-2 No Replace PCB Yes Go to B - 2 No Replace water flow sensor. 12 Yes Replace PCB 13 No 14 No Replace flame rod Replace water temperature thermistor.
Nature of Fault Error code “11” displayed on digital monitor. Examination Point 5. Check sparker. 6. Check main gas solenoid valve (SV0) Error code 71 7. Check solenoid valve (SV1) 8. Check changeover solenoid valve (SV2) Error code “14” displayed on digital monitor 9. Check thermal fuse 10. Check overheat (remaining flame) bimetal switch. REU-2532W Series Diagnostic Point Values Y/N Action 1.
Nature of Fault C. Combustion occurs, but flame fails. Examination Point Y/N Action Yes Go to C-1-2 No Replace PCB Yes Go to C-2 No Replace/rectify 33 Yes Check for other causes of flame failure. 34 No Replace or repair grounding circuit to unit. 35 5 ~ 150 VAC 2. Check to ensure flame rod bracket is not loose. Is it secure? Check for faulty ground wire connections at unit, receptacle, and ground rod to home, and for broken or shorted wires. Are connections OK? 1.
Nature of Fault E. Anti-frost heater does not work. Examination Point 1. Check anti-frost heater. 2. Check frost sensing switch. REU-2532W Series Diagnostic Point Values 2. Measure voltage between orange (+) and grey (-) of the water flow servo connectorB2. 3. Measure voltage between brown ~ grey of water flow servo connector B2. (Do not turn water on). 4. Measure voltage between yellow ~ grey of the water flow servo connector B2. (Do not turn water on) 11 ~ 13 VDC 4 ~ 6 VDC 4 ~ 6 VDC 1.
Gas Pressure Setting Procedure CONTINUUM and INTEGRITY REU-2532- W All settings/adjustments must be performed by a qualified Service Technician. 1. Turn unit off at power source and turn off the gas to the water heater. 2. Remove the front cover from the water heater. 3. Remove the gas pressure test port plug. Connect manometer to this port. See Figure #1 for location of the test port plug. Turn on the gas to the water heater. 4.
8. Turn off the gas to the w ater heater. Remove the manometer connection. Reinstall the pressure port plug. Turn on the gas to the water heater and check for gas leaks around test port with a leak solution. 9. Reinstall the front cover and place the unit back into operation. 10. Verify you are getting the proper water temperature, as set on the controller at your outlets. If controllers are not being used the output temperature should be 120°F. Figure #1 Figure #2 M anifold gas pressure test port.
25. Dismantling for Service NOTE: Before proceeding with dismantling, be sure to follow the CAUTION instructions before each explanation. Always disconnect the electrical supply, turn off water and gas supply service valves, and drain all water from the unit before proceeding. Only trained and qualified service agencies should attempt to repair this product. Item Page 1. Removal of the Front Panel ………………………………………………………………… 55 2. Removal of the PC Board …………………………………………………………………… 55 3.
2. IMPORTANT When dismantling the unit you should always isolate the following items. • Gas supply. • Electrical supply. • Water supply. • Drain all water from the appliance. The following diagram may be of assistance in locating the above. Removal of PC board CAUTION 120 volt potential exposure. Isolate the appliance and reconfirm power has been disconnected using a multimeter. a. Remove the two (2) screws holding the PCB in place with a Phillips screw driver, then pull the PC board out of the appliance.
a. Remove the four (4) Phillips screws that secure the water inlet filter housing to the unit. See picture below for location of screws. Once screws are removed reach into the unit and pull up and out on the flow control assembly to remove it from the appliance. Inspect o-ring for damage. 5. Removal of the Combustion Fan: CAUTION 120 volt potential exposure. Isolate the appliance and reconfirm power has been disconnected using a multimeter. a. Disconnect wiring harness from fan motor. b.
7. Removal of Transformer: CAUTION 120 volt potential exposure. Isolate the appliance and reconfirm power has been disconnected using a multimeter. a. Remove the combustion fan motor assembly as described in section 5-a,b. b. Remove the two (2) Phillips screws to release the transformer. c. Disconnect wiring harness connectors to transformer and pull out towards you. Burner plate screws (6), and (3) gas valve assembly screws. d.
b. Remove the heat exchanger water connection lines, refer to section 3-a. c. Remove the three (3) Phillip screws securing the gas manifold assembly to the gas control valve. d. Remove the six (6) Phillip screws that secure the heat exchanger assembly in place. e. Disconnect connectors B1, B5, B6, C1, C3, F1and F8. These are the igniter, flame rod, thermo-fuse, hot water inlet and outlet thermistor, and the anti-freeze heater connections. 9.
7. Removal of Thermal Fuse: CAUTION 120 volt potential exposure. Isolate the appliance and reconfirm power has been disconnected using a multimeter. a. The REU 2532 has four thermal fuses, see picture below for location. b. Disconnect and remove the thermal fuse. Re-install new thermo fuse using the existing thermo fuse clips. Reconfirm inlet and manifold gas pressures are set to the proper setting. Ensure unit matches gas type being supplied to the heater.
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EXPLODED VIEW - INTERNALS REU-2532W Series 61 Rinnai
EXPLODED VIEW - INTERNALS REU-2532W Series 62 Rinnai
EXPLODED VIEW - ELECTRICAL REU-2532W Series 63 Rinnai
PARTS LIST Number Description Part Number Quantity 001 Front Panel Assembly U245-1110 1 002 Casing Assembly U245-1100 1 003 Wall Installation Bracker U195-121 1 004 Connection Reinforcement Panel U245-120 1 005 Heat Protection Plate U245-107 1 006 Rubber Bushing CF79-41020-A 1 007 Front Panel Packing BU195-167 1 008 Front Panel Packing Side AU115-163 1 009 Cable Connection BU56-602-N 1 010 Cable Seal Packing AU169-126 1 011 Seal Packing AU105-113 1 100 Gas Co
PARTS LIST Number Description Part Number Quantity 111 Packing of Combustion Chamber AU155-207-2 1 112 Lower Packing of Combustion Chamber H73-214 1 113 Screw C10D-5 1 114 Combustion Chamber U245-260 1 Front Plate Assembly 115 Combustion Chamber Front Plate U245-261 1 116 Electrode H73-120 1 117 Flame Rod AH41-216 1 118 Electrode Packing AH66-398 1 119 Electrode Holder AH66-393 1 120 Upper Packing of Combustion Chamber U245-262 1 122 Fan Casing Assembly CH51-61
PARTS LIST Number Description Part Number Quantity 403 By-pass Servo Assembly M6J-1-3 1 404 Stop Bracket AH69-310 2 405 Plug Band H73-512 1 406 Water Filter Assembly H73-511 1 407 Filter Plug H73-510 1 408 Hot Water Outlet (3/4”NPT) U245-865-3 1 409 Stop Bracket AU162-1876 1 410 Plug Band Small AU103-413 1 411 Drain Valve AU142-444 1 702 PCB Cover-Side BU195-507 1 703 PCB Cover-Front BU168-707 1 704 Transformer Assembly ET-281 1 705 PCB Bracket U245-257
PARTS LIST Number Description Part Number Quantity 718 Anti-Frost Heater Clip AU100-721 1 720 Power Supply Harness AU195-1876 1 721 Fuse Harness BU195-1630 1 722 100V Harness U245-601 1 723 Solenoid Valve Harness U245-602 1 725 Thermal Fuse Harness U245-610 1 726 Mold-Type Over Heat Switch BU129-824-2 1 730 PCB U245-1200 1 731 Surge Protector BU195-1873 1 732 Frost Sensing Switch H73-750 1 733 120V Anti-Frost Heater Assembly U245-1320 1 734 Sensor Harness - 2
PARTS LIST Number Description Part Number Quantity 814 O-ring M10B-2-16 2 815 O-ring M10B-2-14 2 816 O-ring M10B-2-7 1 817 O-ring M10B-1-24 1 818 Packing C36E1-6 2 888 V2532W Owner’s Manual U245-1360 1 - Package Spec Sheet PWB-261 1 - “Manual 3/4”” gas control valve” BU195-1865 1 - Kitchen remote control kit MC-45-4US 1 - Bathroom remote control kit BC-45-4US 1 - 2nd Bathroom remote control kit BSC-45-4US 1 REU-2532W Series 68 Rinnai
SERVICEMAN’S TROUBLESHOOTING INFORMATION for the RINNAI “CONTINUUM REU2532-W” WATER HEATERS IMPORTANT SAFETY NOTES: There are a number of (live) tests that are required when fault finding this product. Extreme care should be used at all times to avoid contact with energized components inside the water heater. Only trained and qualified service agencies should attempt to repair this product.
White ~ Black 6 ~ 45 VDC 9.2K ~ 9.4K A1 2~4 Yellow ~ Black 11 ~ 13 VDC 3.5K ~ 3.9K A1 2~3 Set your meter to the hertz scale. Reading across the red and yellow wires at terminals 2 and 3 you should read between 60 and 350 hertz. Thermal Fuse: Red ~ Red 100 VAC Below 1 ohm B~C B6 ~ C1 Overheat Switch: Red ~ Red 100 VAC Below 1 ohm B~C B6 ~ C1 Flame Rod: Place one lead of your meter to the flame rod and the other to earth or ground. With the unit running you should read between 5 ~ 150 VAC.
Using a voltage meter set on the 200 ohm scale, you should have a resistance reading of 26 ~ 30 ohms through each of these heaters. The heater located on the heat exchanger piping should have a resistance reading of 81 ~ 86 ohms and the one located in the water flow sensor valve has a resistance reading of 16 ~ 19 ohms. Voltage throughout this circuit should be 120 VAC. (3) Amp Fuses: This unit has two inline (3) amp glass fuses. Remove the fuse and check continuity through it.
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