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Manual 238-53991-00A 05/22

SERVICE

MANUAL

Troubleshooting Guide

and Instructions for Service

(To be performed ONLY by

qualified service providers)

Models Covered

by This Manual:

URG2PV75H76*N19

ULG2PV75H76*N19

(*) Denotes Warranty Years

UPV75 Series Ultra Low NOx

Through-The-Wall Gas Water Heaters

Содержание ULG2PV75H76 N19 Series

Страница 1: ...MANUAL Troubleshooting Guide and Instructions for Service To be performed ONLY by qualified service providers Models Covered by This Manual URG2PV75H76 N19 ULG2PV75H76 N19 Denotes Warranty Years UPV7...

Страница 2: ...16 II Pressure Switch Testing Replacement 18 III Blower Testing Replacement 20 IV Replacement Wire Harness Installation 22 V Blower Temperature Switch Testing Replacement 24 VI Gas Control Testing Re...

Страница 3: ...use the odorant to diminish in intensity or fade and not be as readily detectable If you have a diminished sense of smell or are in any way unsure of the presence of gas immediately contact your gas s...

Страница 4: ...nts Cooler operation increases blower life by reducing bearing wear and noise Rugged Wiring Connections Receptacle type connections promote error free wiring Increased Vent Lengths Increased venting p...

Страница 5: ...uired for Service Manometer A liquid U tube type or a digital magnahelic type can be used This device is used to measure gas and or air pressure and vacuum Multi Meter A digital type is strongly recom...

Страница 6: ...160 F 71 C approximate temperatures Commercial Temperature Set Point Range 80 F 27 C to 180 F 82 C approximate temperatures Blower Temperature Switch Normally closed opens 155 F 68 C auto reset approx...

Страница 7: ...gh the Roof 2 7 2 1 65 19 8 55 16 8 25 7 6 15 4 6 Through the Roof 3 7 2 1 60 18 2 50 15 2 20 6 1 10 3 0 VENT CONNECTOR LENGTHS FOR 4 in 10 2 cm DIAMETER VENT PIPE Terminating of Elbows excl vent term...

Страница 8: ...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 27 Verify Resistive Delay Retry aft...

Страница 9: ...peats as long as there is a call for heat 4 Blower pre purge period 2 seconds 5 Trial for pilot ignition 90 seconds a The gas control lights the pilot by activating spark igniter and gas flow to pilot...

Страница 10: ...ture control to the minimum setting for at least 6 seconds before returning to desired temperature setting 3 Pressure Switch Blower Temperature Fault a Pressure switch closed at start of call for heat...

Страница 11: ...lame Sensing Fault a Flame lost during run The gas control turns off pilot and main valves runs blower for 15 seconds inter purge The gas control increments the recycle count if the recycle count has...

Страница 12: ...ot 2 Pilot tube block or restricted 3 Oxidation build up on pilot electrode 4 Wire damage to pilot assembly or bad connection at gas valve Page 16 Two flash three second pause Pressure switch not work...

Страница 13: ...bustion air 6 Gas pressure is out of specification 1 4 Page 16 5 Refer to installation manual 6 Page 26 Six four flash three second pause Undesired false pilot flame sensed System auto resets Pilot va...

Страница 14: ...ly from pilot and burn with a blue 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 co...

Страница 15: ...acuum Step 12 Thoroughly inspect 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...

Страница 16: ...ner door in place Step 7 Remove the 4 hex drive screws holding the left side burner door in place Step 8 Remove the burner assembly from the combustion chamber Step 9 Remove the pilot assembly from th...

Страница 17: ...Replace the pilot as necessary Electrode should not be in contact with the pilot hood if so carefully adjust electrode to a gap of distance of 3 32 09 from the pilot hood Step 18 Visually inspect the...

Страница 18: ...cal continuity Position gas valve power switch to the ON position and adjust thermostat to call for heat this will start the blower Check with the multi meter do pressure switch contacts close with th...

Страница 19: ...sure switch see photo 5 Step 5 Disconnect red wires from pressure switch see photo 6 Step 6 Reconnect wires from Step 5 to new pressure switch Step 7 Reconnect tubing to new pressure switch Step 8 Car...

Страница 20: ...C Does blower energize after 2 minutes run for 30 seconds and shut down Remove the head screws 1 4 driver as shown in photo 9 Then disconnect the cord shown in photo 10 Is there 115VAC across the term...

Страница 21: ...1 Clean any debris from jacket head of water heater Step 2 Reconnect cord set from Blower Removal Step 5 Step 3 Set new blower with gasket in place using locating pins on blower flange to line up with...

Страница 22: ...e interior molded wall Drilling through the interior molded wall will require the blower to be replaced below 3 Clean any debris from the jacket and jacket head of the water heater 4 Insert the extern...

Страница 23: ...23 External Wire Harness Installation continued 6 Install the blower assembly according to the steps outlined in Blower Removal page 21 23...

Страница 24: ...connect wire leads to switch Using a multi meter set the ohms setting is there continuity between the switch terminals Reconnect wire leads and observe heater operation Do exhaust gas temperatures ris...

Страница 25: ...seven T20 Torx screws from the blower top photo 18 Then remove the top of the blower photo 19 Step 6 Remove switch from blower housing Step 7 Install new switch Be sure switch is properly seated in mo...

Страница 26: ...Step 3 Connect manometer to pressure tap Step 4 Follow instructions located on the lighting instructions label or in the Installation and Operation Manual and proceed to light the main burner and obse...

Страница 27: ...de Tank WARNING Stored water may be HOT when performing the following steps in this procedure Take necessary precaution to prevent personal injury Step 1 Position gas control power switch to OFF posit...

Страница 28: ...control body damage to the gas control may occur If necessary use a length of NPT pipe threaded into gas inlet of gas control Gas Control Installation Into Water Heater Step 1 Install a new gas contr...

Страница 29: ...from gas control Step 3 Using a multi meter set to the ohms setting check resistance of the simulative resistance device Resistance must be within 3 000 ohms and 48 000 ohms If outside of this range...

Страница 30: ...No voltage from gas control call Technical Support Verify 115VAC to gas control see page 30 Is there 10 to 13 VAC between red wire on temp switch and jacket head screw Is there continuity through blo...

Страница 31: ...shown in photo 24 Incorrect supply voltage polarity Reconnect cord set shown in photo 22 Disconnect wire harness from gas control see photo 25 Locate black white wires at connector it may be necessar...

Страница 32: ...e inlet nipple from the plumbing system Step 4 With an appropriate tool such as a pipe wrench remove the inlet nipple diptube from the water heater Use caution not to damage pipe threads Step 5 Visual...

Страница 33: ...Step 3 Disconnect the outlet nipple from the plumbing system Step 4 With an appropriate tool such as a pipe wrench remove the outlet nipple anode from the water heater Use caution not to damage pipe t...

Страница 34: ...and any missing restrictors Clean any scale or debris build up Replace with new baffle as necessary Step 7 Reinstall baffle into flue tube Be sure hanger tabs are inserted into notch location at the...

Страница 35: ...side inner door Step 5 Remove 4 drive screws from the left side burner door Step 6 Remove the connectors attached to the resettable thermal switch on the manifold mount Step 7 Remove the inner door a...

Страница 36: ...or A seal breach may result in a fire or explosion causing property damage personal injury or death DO NOT over tighten screws in Steps 2 4 and 5 Step 1 Clean any residual gasket residue or other debr...

Страница 37: ...cement Inner Door Gasket Replacement Procedure cont Step 6 Replace the outer jacket burner access door Step 7 To resume operation follow the instructions located on the lighting instruction label or t...

Страница 38: ...f the vent 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...

Страница 39: ...r Temp Switch 12 T P Valve 21 Main Burner Orifice 30 Kit Heat Trap Insert 4 Blower Gasket 13 NPT Plug 22 Main Burner Feedline 31 Kit Vent Adapter 5 Flue Reducer 14 Burner Assembly 23 Restable Thermal...

Страница 40: ...ty bradfordwhite com 800 538 2020 parts bradfordwhite com Sales Technical Support Fax Warranty Technical Support Service Parts Orders 866 690 0961 905 203 0600 905 636 0666 bwccwarranty bradfordwhite...

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