Bradford White D-38T-155 Service Manual Download Page 42

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NOTES

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Summary of Contents for D-38T-155

Page 1: ...qualified service providers Models Covered by This Manual For The Bradford White D Series Models D38T155 D75T 125 160 300 D65T 370 399 D80T 180 199 250 D80T 425 505 D100T 199 250 D80L 399 450 505 D100...

Page 2: ...roubleshooting 7 Thermostat Circuit Testing 24 D24 I Pilot Operation Testing 27 D24 II Main Burner Operation Testing 30 D24 III Main Burner Pilot Removal Inspection 32 D24 IV Flue Baffle Removal Inspe...

Page 3: ...or degrees C Single control board with plug in wiring controls temperature ignition and flue damper operation Reduced number of parts for servicing and wiring Plug in wiring reduces chance of miswiri...

Page 4: ...available a liquid U tube type or a digital magna helic type This device is used to measure gas and or air pressures and vacuum Multi Meter A digital type is strongly recommended This device is used t...

Page 5: ...earance for Servicing 24 Front Clearance 20 Top 6 Sides Maximum Water Supply Pressure 150 PSI Thermostat Sensor s Redundant thermister with 11 900 or 0 5 ohms resistance at 70 deg F Sensor inside well...

Page 6: ...me through the flame sensor rod If pilot flame is lost pilot and main burners are shut down After a 65 second inter purge period the control will attempt to re light the pilot beginning at sequence 3...

Page 7: ...n to open Increase thermostat setting if tank is warm and make sure the control display status reads Heating Check wire connections of board to display See illustration With the control cover tilted d...

Page 8: ...isplaying temperature sensors Error code 63 on display See Main Burner Short Cycles Does the flue damper rotate to the fully closed position Error code 56 on display Check for debris limiting damper r...

Page 9: ...s until Max Setpoint is shown in the display Step 2 Pressing Select button will change display to next mode SELECT SET Status F idle Operational Water Temp The following is the sequence of modes avail...

Page 10: ...emp Operational 2b Water Temperature Upper Sensor Displays if there is an upper sensor some models SELECT SET Status F idle Operational Upper Sensor 2c Water Temperature Lower Sensor Displays if there...

Page 11: ...al Flame Current A 4 Setpoint Display Change SELECT SET Status F idle setpoint Operational 5 F C Display Change SELECT SET Status F C idle Operational F setpoint 6 Differential Display only shows the...

Page 12: ...tep 1 In service mode press the Select button until Max Setpoint is displayed SELECT SET Status F idle Max Operational Setpoint Page 12 Troubleshooting WARNING Setting the water temperature to the max...

Page 13: ...int value This will limit the maximum setpoint the user can select Note The maximum setpoint is approximately 180 F Step 4 Press Set button to confirm new Max Setpoint value and stop setting mode Page...

Page 14: ...ice Mode Press the Select button until Water Temp is displayed in the upper right section of the water heater display For water heaters using two temperature sensors in the tank this will be the avera...

Page 15: ...hen the burners are in operation Step 1 Make sure the status displays Heating or draw enough hot water to start the burners Step 2 Enter the Service Mode described previously Step 3 Press the Select b...

Page 16: ...nal Setpoint Flashes Troubleshooting WARNING Setting the water temperature to the maximum set point can result in scalding hot water delivered to the faucets It is highly recommended that the maximum...

Page 17: ...and Change Temperature Format F C To Change Temperature Format in Display from F to C or C to F Step 1 While in Service Mode press Select button until F C is shown in the upper right portion of the wa...

Page 18: ...atus idle Operational C F C Step 3b Press Temperature Down button to change temperature format to F SELECT SET Status idle Operational F F C Step 4 Press Set button to confirm F or C format F C will s...

Page 19: ...ce Manual explains the error codes with corrective actions to repair the water heater Example of Error Code in the Display Error Code History In Service Mode pressing the Select button after the Softw...

Page 20: ...ror code index starting with the most recent error code 10 SELECT SET Status idle Operational Step 3 Press the Select button to view the error code for code 10 If there is a number displayed note what...

Page 21: ...or code number if any for that index number Continue on to index 1 the oldest error code index The water heater display will store up to 10 error codes with the oldest code starting in code index 1 wi...

Page 22: ...heater display with Service Needed shown below the error code number Note the error code and the definition in the chart below This label appears on the control box under the water heater display The...

Page 23: ...ill also go through 3 attempts to relight the burners every hour in the soft lockout condition All other error codes will put the water heater into a Hard Lockout condition in which the water heater w...

Page 24: ...hands or tools Turn power OFF Draw water to cool tank below 120 deg F Check lower sensor Is the sensor fully inserted into the well Sensor is held in place with a clip fastened to the well see photo...

Page 25: ...ted Once cause of overheating condition has been diagnosed and corrected the control may be reset Reconnect and switch on power to the water heater Enter service mode on the water heater display see i...

Page 26: ...Circuit Testing Upper thermister location applicable models Lower thermister access located inside control box Sensor Resistance Testing Upper Sensor 1 Determine resistance value of upper sensor Test...

Page 27: ...his test Tighten pilot tube connection at the gas valve Check incoming gas pressure to water heater if okay replace gas valve Check for clogged or kinked pilot tube clogged pilot orifice Clean or repl...

Page 28: ...pilot shield is touching pilot flame sensor or flame sensor touching pilot hood Bend shield to prevent interference or replace pilot shield Check pilot flame sense wire for broken insulation Replace p...

Page 29: ...res with ohmeter Are ground wires okay Check for loose or damaged flame sense lead from pilot to Control Board see illustration to the right Is flame sense lead okay Repair wire lead or replace pilot...

Page 30: ...e lead from MV terminal of gas valve Is there 22 27 volts AC across brown wire lead ground see photo 15 Replace control board Be sure control display is showing Heating pilot is lit and control is not...

Page 31: ...uctions N Check burner tubes for scale or debris build up Clean burner as necessary see Main Burner and Pilot Removal and Inspection Check tank flues for blockage or debris build up causing restrictio...

Page 32: ...lide complete burner rack out from heater see photo 19 Step 9 To install burner reverse above procedure Step 10 Check for gas leaks and verify proper operation Gas Valve Control Knob Gas Supply Line G...

Page 33: ...Ground Wire Location Pilot Burner Inspection Step 1 Inspect pilot for the following a Broken or cracked ceramic insulators If found pilot must be replaced b Damaged electrode or flame sense wire If f...

Page 34: ...wire connections from board Pull out sensor Remove clip Wire connections DANGER 120 volt exposure To avoid personal injury unplug while performing this procedure Page 34 23 25 24 26 Step 3 To remove...

Page 35: ...ove collector cover from water heater by using pipe wrench as illustrated in photo 30 Step 9 Remove flue baffles from water heater Note it may be necessary to use pliers to loosen and remove baffles f...

Page 36: ...ox anode locations Step 10 Remove screws from side or top of collector cover Note it may be necessary to chisel away some foam to access screws see photo 34 Step 11 Locate and remove anode rods from t...

Page 37: ...Page 37 SERVICE PROCEDURE D24 VI Anode Removal and Inspection Approximate Anode Rod Locations 37...

Page 38: ...cess Cover 16A Cleanout Access Cover ASME 17 Cleanout Cover Screw 17A Cleanout Cover Screw ASME 18 Cleanout Jacket Cover 19 Thermostat Sensor Clip 20 Burner Assembly Complete 21 Brass Drain Valve 22 C...

Page 39: ...rner 9A Pilot Orifice 10A Pilot Tubing 11A Pilot Mounting Screw 12A Burner Tube Support 13A Manifold Bracket 14A C Cane Manifold 15A Manifold Straight 16A Manifold Bracket 17A 90 Street Elbow Black 18...

Page 40: ...7 8 Snap Bushing 11B Power Cord Strain Relief 12B Pilot Wire Strain Relief 13B Secondary Transformer Wiring Harness 14B Primary Transformer Wiring Harness 15B Screw 8 18 x PHCR 16B Gas Valve Control W...

Page 41: ...Energy Cut Off GFI Ground fault interrupt GPM Gallons per Minute Hz Hertz LED Light Emitting Diode NOx Oxides of Nitrogen NPT National Pipe Thread PSI Pounds per Square Inch VA Volt Amps VAC Volts Alt...

Page 42: ...NOTES Page 34...

Page 43: ...NOTES Page 34...

Page 44: ...Email parts bradfordwhite com techserv bradfordwhite com www bradfordwhite com...

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