Bradford White ULG2PV50H56*N Service Manual Download Page 23 | Manualshive

Page: 23 / 44

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23

UPV Series

23

Blower Temperature Switch Testing

Step 1. Position power switch on gas

control to the “OFF” position.

Step 2. Remove the three screws (Phillip’s

screw driver) from control access

cover on blower and remove cover

(see photo 14).

Step 3. Locate blower temperature switch

(see photo 15).

WARNING

115 volt potential exposure. Use

caution to avoid personal injury.

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Summary of Contents for ULG2PV50H56*N

Page 1: ...L Troubleshooting Guide and Instructions for Service To be performed ONLY by qualified service providers Models Covered by This Manual URG1PV40S N URG1PV50S N URG2PV40T N URG2PV50T N URG2PV50H N ULG2P...

Page 2: ...h Testing Replacement 19 III Blower Testing Replacement 21 IV Blower Temperature Switch Testing Replacement 23 V Gas Control Testing Replacement 25 VI Flammable Vapor Device Testing and Replacement 28...

Page 3: ...al for more information WARNING FAILURE TO INSTALL AND MAINTAIN A NEW LISTED X TEMPERATURE AND PRESSURE RELIEF VALVE WILL RELEASE THE MANUFACTURER FROM ANY CLAIM THAT MIGHT RESULT FROM EXCESSIVE TEMPE...

Page 4: ...erifies proper conditions exist for safe and reliable operation If a situation outside of normal operating parameters exists the gas control diagnostic LED will flash a code to positively identify an...

Page 5: ...l Tools Required for Service Manometer Multi Meter Electronic Probes Thermometer Water Pressure Gage Various Hand Tools A liquid U tube type or a digital magnahelic type can be used This device is use...

Page 6: ...codes for supply pressure Gas Control ECO Limit Residential 188 F 87 C Commercial 199 F 93 C Residential Temperature Set Point Range 60 F 16 C to 160 F 71 C approximate temperatures Commercial Tempera...

Page 7: ...oof 1 45 13 7 7 2 1 Through the Roof 2 40 12 2 7 2 1 Through the Roof 3 35 10 7 7 2 1 Through the Roof 4 30 9 2 7 2 1 3 Diameter 7 6 cm Vent Connector Lengths Terminating of Elbows Maximum Straight Le...

Page 8: ...he Roof 1 55 16 8 7 2 1 Through the Roof 2 50 15 2 7 2 1 Through the Roof 3 45 13 7 7 2 1 4 Diameter 10 2 cm Vent Connector Lengths Terminating of Elbows Maximum Straight Length ft m Minimum Straight...

Page 9: ...aximum 1 second minimum Post purge 15 Seconds PS Fault Delay failed open close Retry after 2 minutes Soft Lockout Retry after 5 minutes ECO Limit Lockout Indefinite see page 26 Verify Resistive Delay...

Page 10: ...flashes 2 times with 3 second pause Gas control waits 2 minutes then blower runs for 30 seconds This cycle repeats until safety circuit opens 2 Blower energizes 3 Pressure switch proves blower vent sy...

Page 11: ...eration 1 Flammable Vapor Sensor or Simulated Resistive Device Fault a If the resistance is greater than 70 000 Ohms the gas control immediately turns off all outputs Control waits and monitors resist...

Page 12: ...flashes 3 times with 3 second pause The gas control waits 2 minutes before turning on the blower for another 30 seconds to see the circuit close This cycle repeats as long as there is a call for heat...

Page 13: ...s If the recycle count has been reached the gas control turns off the blower and flashes 6 times then 3 times with 3 second pause The gas control waits 5 minutes before repeating the ignition sequence...

Page 14: ...ilot tube block or restricted 3 Oxidation build up on pilot electrode 4 Wire damage to pilot assembly or bad connection at gas valve Page 18 Two flash three second pause Pressure switch not working cl...

Page 15: ...s out of specification 1 4 Page 18 5 Refer to installation manual 6 Page 25 Six four flash three second pause Undesired false pilot flame sensed System auto resets Pilot valve stuck in open position R...

Page 16: ...lue flame with a minimum of yellow tips Main burner must be free from any debris accumulation that may affect burner operation Burner Cleaning Step 1 Position the gas control power switch to the OFF p...

Page 17: ...burner screen and burner venturi and remove any loose debris accumulation Inspect burner screen for any openings larger than the normal screen openings Step 13 Remove main burner orifice from feedlin...

Page 18: ...not be in contact with pilot hood if so carefully adjust electrode to a gap of distance of 3 32 09 from pilot hood Step 6 Visually inspect pilot tubing for kinks or cracks If damage is found replace p...

Page 19: ...the OFF position Step 2 Remove the three screws Phillips screw driver from control access cover on blower assembly and remove cover see photo 1 Step 3 Carefully remove pressure switch from blower hous...

Page 20: ...Step 4 Disconnect tubing from pressure switch see photo 5 Step 5 Disconnect yellow wires from pressure switch see photo 6 Step 6 Reconnect wires from step 5 to new pressure switch Step 7 Reconnect tub...

Page 21: ...wer switch to ON position and adjust control to call for heat Step 2 Remove the three screws Phillip s screw driver from control access cover on blower assembly and remove cover see photo 7 WARNING 11...

Page 22: ...r with gasket from water heater Blower Installation Step 8 Clean any debris from jacket head of water heater Step 9 Set new blower with gasket in place using locating pins on blower flange to line up...

Page 23: ...on gas control to the OFF position Step 2 Remove the three screws Phillip s screw driver from control access cover on blower and remove cover see photo 14 Step 3 Locate blower temperature switch see p...

Page 24: ...tep 5 With an appropriate tool such as side cutters snip the retaining lug from the blower housing to allow removal of temperature switch see photo 18 Step 6 Remove switch from blower housing Step 7 I...

Page 25: ...3 Connect manometer to pressure tap Step 4 Follow instructions located on the lighting instructions label and proceed to light the main burner and observe manometer reading Step 5 Proper operating ra...

Page 26: ...perature Inside Tank Step 1 Position gas control power switch to OFF position Step 2 Draw approximately 4 gallons of water from drain valve into a container and discard Draw an additional gallon and i...

Page 27: ...ontrol Step 7 Disconnect pilot tube from gas control and move away from gas control Step 8 Remove gas control from water heater by rotating counter clockwise DO NOT use a wrench on the gas control bod...

Page 28: ...sing a multi meter set to the ohms setting check resistance of flammable vapor sensor Resistance must be within 3 000 ohms and 48 000 ohms If outside of this range replace Flammable Vapor Sensor CAUTI...

Page 29: ...oltage Trace NOTE This procedure assumes a cool tank Remove three screws Phillips screw driver from control access cover on blower and remove cover see photo 21 WARNING 115 volt potential exposure Use...

Page 30: ...uit Trace Step 1 Verify 115 VAC and proper polarity at wall outlet Step 2 With unit plugged in and control power switch in the ON position verify LED status WARNING 115 volt potential exposure Use cau...

Page 31: ...t nipple dip tube Inlet nipple diptube should be free of cracks and any blockage Hydrojet slots should be open and free of any blockage Any damage such as cracks restriction due to deformation or unin...

Page 32: ...p 5 Visually inspect outlet nipple anode Outlet nipple anode should show signs of depletion this is normal If depletion is of the original anode diameter approximately diameter replacement is recommen...

Page 33: ...r deterioration and any missing restrictors Clean any scale or debris build up Replace with new baffle as necessary Step 8 Reinstall baffle into flue tube Be sure hanger tabs are inserted into notch l...

Page 34: ...ve the connectors attached to the resettable thermal switch on the manifold mount Step 7 Remove the flammable vapor sensor from the clip by pushing down the tab to open the clip Step 8 Remove inner do...

Page 35: ...tion chamber surface before installing the inner door gasket assembly Step 2 Place the left side inner door into position first Using the hex drive screws secure left side inner door in place DO NOT O...

Page 36: ...tegrity around combustion opening Secure right side inner door using hex drive screws DO NOT OVER TIGHTEN SCREWS Verify both left and right sides of inner door are properly positioned and sealed again...

Page 37: ...the red colored button located at the center of the switch The overheating condition must be determined prior to putting the water heater back into service Probable Cause for Resettable Thermal Switc...

Page 38: ...n place Be sure contact surface of resettable thermal switch and manifold mount are free of any debris Secure resettable thermal switch into place using screws from step 6 DO NOT OVER TIGHTEN SCREWS S...

Page 39: ...y scale or other debris accumulation Using a soft brush clear jacket openings from any dirt dust restrictions or other obstructions Step 6 Remove any debris from burner assembly per the burner cleanin...

Page 40: ...ent terminals in relation to each other and terminals from other appliances can have an effect on the potential for blockage due to ice or snow See the installation instructions for recommended positi...

Page 41: ...T P Valve 16 NPT Plug 17 Burner Assy 18 Pilot Assembly 19 Pilot Orifice 20 Pilot Assy 21 Main Burner 22 Resettable Thermal Switch 23 Main Burner Mount 24 FV sensor mount plate 25 Main Burner Orifice 2...

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