Bradford-White Corp M2XR504T, CX) Open Circuit Thermocouple Testing, Thermocouple Replacement

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SERVICE PROCEDURE RG-II

Thermocouple Testing and Replacement

OPEN CIRCUIT THERMOCOUPLE TESTING

Step 1. Disconnect thermocouple from combination thermostat/gas valve.

Step 2. Using a multimeter capable of measuring millivolts, connect one alligator clip to the end ball or contact portion of the thermocouple, and the other alligator clip to copper portion of the thermocouple.

Step 3. Following the lighting instruction label on the heater, proceed to light the pilot and allow to operate for three minutes. It will be necessary to hold the pilot button down continuously throughout this test. A reading of 20 to 30 millivolts indicates good thermocouple output.

THERMOCOUPLE REPLACEMENT

Step 1. Turn off gas supply to water heater. Rotate knob of combination thermostat/gas valve to “OFF” position.

For White Rodgers Control, depress knob slightly and rotate clockwise to the “OFF” position.

For Robertshaw Control, rotate knob clockwise to the “OFF” position.

Step 2. Remove outer jacket door.

Step 3. Remove right side of inner door per SERVICE PROCEDURE RG-I, steps 3a through 3c.

Step 4 Disconnect thermocouple from combination thermostat/gas valve (3/8" wrench). Locate other end of thermocouple inside of combustion chamber and remove from pilot bracket. Pull firmly pulling away from the pilot assembly.

Step 5. Install new thermocouple into pilot bracket making certain the thermocouple is fully engaged into the pilot bracket. Position thermocouple against left side inner door flange at its original position. Connect other end of thermocouple to combination thermostat/gas valve (finger tight + ¼ turn).

Step 6. Inspect inner door gasket per

SERVICE PROCEDURE RG-I, Step 4.

Thermocouple position

Step 7. Install right side inner door per

SERVICE PROCEDURE RG-I,

Step 10 through Step 13

Step 8. To resume operation follow the instructions located on the lighting instruction label or the lighting instructions located in the installation and operation manual.

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Contents MI30T*FBN,CX M430T*FBN,CX MI50L*FBN,CX M1XR403S*FBN,CX MI504S*FBN,CX M1XR504T*FBN,CXMI60T*FBN,CX M2XR504T*FBN,CX M2C504T*FBN,CX 50T65FBN,CX Table of Contents Introduction Bradford White Defender Safety SystemFlammable Vapor Ignition Resistant Water Heaters Troubleshooting ChartProceed to Inner Door Gasket Replacement Procedure Service Procedure RG-IFollowed exactly, a fire or explosion may result causing If the information in these instructions is notInstallation of Inner Door With Gasket Replace outer jacket burner access door Thermocouple Testing and Replacement Service Procedure RG-IIClosed Circuit Thermocouple Testing White Rodgers Control Closed Circuit Thermocouple Testing Robertshaw ControlThermocouple Replacement Open Circuit Thermocouple TestingPilot Assembly Inspection, Cleaning and Replacement Service Procedure RG-IIIService Procedure RG-IV Piezo Igniter, Electrode Testing and ReplacementPiezo IGNITER, Electrode Testing and Replacement Combination Thermostat/Gas Valve Testing Replacement Service Procedure RG-VCombination Thermostat/Gas Valve Testing and Replacement Line PressureThermocouple Testing Magnet Assembly Testing White Rodgers ControlMagnet Assembly Testing Robertshaw Control Combination THERMOSTAT/GAS Valve Replacement ECO Energy Cut Off TestingWrench Boss Explosion causing property damage Seal breach may result in a fire orPersonal injury or death Service Procedure RG-VI Main Burner Inspection, Adjustment Cleaning and ReplacementCast Iron Burner Adjustment Feedline Burner Cleaning Service Procedure RG-VII Resetting Thermal Switch Testing and ReplacementResettable Thermal Switch Continuity Testing Over Tighten Screws Resettable Thermal Switch ReplacementService Procedure RG-VIII ScreenLok Flame Arrestor CleaningScreenLok Flame Arrestor Cleaning Service Procedure RG-IX Dip Tube and Anode Inspection and ReplacementDIP Tube Inspection and Replacement Anode Inspection and Replacement Parts List Page Page Fax/215-641-1612
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