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Manual 238-51791-00A

REV 08/18

Effective:

August 2018

ECO 7960

SERVICE

MANUAL

Troubleshooting Guide

and Instructions for Service

(To be performed ONLY by

qualified service providers)

Models Covered

by This Manual:

CEHD(50,80,120)(A)

Bradford White ElectriFLEX HD

™

(Heavy Duty)

Commercial Electric Water Heater

CEHD SERIES

Immersion Thermostat Models

Summary of Contents for ElectriFLEX HD CEHD 120

Page 1: ...8 ECO 7960 SERVICE MANUAL Troubleshooting Guide and Instructions for Service To be performed ONLY by qualified service providers Models Covered by This Manual CEHD 50 80 120 A Bradford White ElectriFL...

Page 2: ...ing 13 Service Procedure III Fuse Testing 14 Service Procedure IV Hi Limit Switch Testing 15 Service Procedure V Thermostat Testing 16 Service Procedure VI Contactor Testing 18 Service Procedure VII T...

Page 3: ...f diagnosis cannot be made using the methods described in this service manual Tools Required for Service Multi Meter A digital type is strongly recommended This device is used to measure electrical va...

Page 4: ...number is coded to identify the specific electrical characteristics used for a particular unit Below is typical model number and coded definitions In the field this information is determined from the...

Page 5: ...5 5 General Controls Layout...

Page 6: ...temperature is sufficient to satisfy the adjustable temperature limit of control High Limit Switch Control for Contactor Models The high limit switch will interrupt control circuit voltage causing th...

Page 7: ...ll for heat one or more contactors will energize all heating elements simultaneously The operating coils are voltage specific When contactor replacement is required be sure to order the proper operati...

Page 8: ...50 0 28 9 43 3 18 2 16 7 25 0 14 4 11 5 13 5 64 9 37 5 56 2 32 5 48 7 20 5 18 8 28 1 16 2 13 0 15 72 1 41 6 62 5 36 1 54 1 22 7 20 9 31 2 18 0 14 4 18 86 5 50 0 75 0 43 4 64 0 27 3 25 0 37 5 21 6 17...

Page 9: ...or Models The system has two distinct circuits 1 Power circuit shown solid line 2 Control Circuit shown dotted line 1 Line voltage is applied across terminals of fuse block or a terminal block Line vo...

Page 10: ...ll of water prior to energizing the water heater 2 Grounded Element In most cases an element with a short circuit to ground will cause the circuit breaker in the service panel to open or shut off In s...

Page 11: ...nt s 3 Increase thermostat setting 4 Check thermostat 5 Check contactor operation 6 Check all wire connections 7 Reduce demand 8 Replace with larger heater 9 Temper water to heater 10 Correct plumbing...

Page 12: ...ttage 208 240 480 2000 20 3 22 9 27 1 30 5 114 3 122 1 3000 13 5 15 3 18 0 20 4 72 2 81 4 4000 10 2 11 4 13 5 15 3 54 1 61 0 4500 9 0 10 2 12 0 13 6 48 1 54 3 5000 8 2 9 2 10 8 12 2 43 3 48 9 6000 6 7...

Page 13: ...er 6 Use caution and check voltage across top terminals where service voltage connects to water heater see illustration 3 A Rated voltage IS present power to the water heater is okay B Rated voltage N...

Page 14: ...llow access to fuse block 3 Locate fuse block s and remove fuses 4 Set multi meter to Ohms setting 5 Check continuity across fuse see illustration 5 A Continuity IS present fuse is okay B Continuity N...

Page 15: ...tch reset button Recheck continuity across terminals 1 2 see illustration 6 A Continuity IS present the Hi Limit Switch has previously opened indicating the water in the tank at some point did overhea...

Page 16: ...y thermostat operation Thermostat Control Continuity Testing 1 This procedure assumes line voltage Hi Limit Switch and contactors are in working order 2 STOP DANGER Turn power off to water heater 3 Op...

Page 17: ...eat from the thermostat There are three different operating coils used depending on voltage rating of the water heater as follows Description Color Code 208 240 Volt Coil Green 277 Volt Coil Blue 480...

Page 18: ...esent verify control circuit operation 2 Check for rated voltage across lower terminals of contactor s see illustration 11 A Rated voltage IS present okay go to step 3 B Rated voltage NOT present repl...

Page 19: ...mounting screws located under thermostat dial see illustration 12 9 Once thermostat is removed disconnect wire leads to the thermostat NOTE It may be necessary to identify wires for proper reconnecti...

Page 20: ...scale from tank surface where new Hi Limit switch will be installed 2 Slide new Hi Limit switch up into thermostat bracket until it snaps into place IMPORTANT Hi Limit switch must be set completely f...

Page 21: ...all surfaces of the element terminal block see illustration below 2 Apply new element gasket to the new element Be sure gasket is seated against element flange without rolls or gaps see illustration b...

Page 22: ...pect anode Anode should show signs of depletion this is normal If depletion is 1 2 of the original anode diameter original diameter approximately 3 4 replacement is recommended If any of the steel cor...

Page 23: ...23 23 Parts List Customer must specify complete model number and serial number when ordering service parts...

Page 24: ...Fahrenheit NPT Nation pipe thread C Degrees Centigrade ASME American Society of Mechanical Engineers 1 Large Control Box 17 NPT Nipple 2 Small Control Box 18 Temperature and Pressure Relief Valve 3 Te...

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