Bradford White U65L155E N Series Service Manual

Gas water heaters

Hide thumbs

Table Of Contents

Table of Contents

Quick Links

Download this manual

Ultra Low NOx Atmospheric Vent

Manual 238-50129-00A

Gas Water Heaters

SERVICE

MANUAL

and Instructions for Service

Troubleshooting Guide

(To be performed ONLY by

qualified service providers)

Models Covered

by This Manual:

U65L155E*N (A)

U65L199E*N (A)

U65L270E*N (A)

U100L199E*N (A)

U100L270E*N (A)

U100L300E*N (A)

U100L399E*N (A)

(*) Denotes Warranty Years

Save this manual for future reference

Table of Contents

Summary of Contents for Bradford White U65L155E N Series

Page 1 Ultra Low NOx Atmospheric Vent Gas Water Heaters SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) Models Covered by This Manual: U65L155E*N (A) U65L199E*N (A) U65L270E*N (A) U100L199E*N (A) U100L270E*N (A) U100L300E*N (A) U100L399E*N (A) (*) Denotes Warranty Years Manual 238-50129-00A...
Page 2: Table Of Contents
The Bradford White Table of Contents Page Service Procedure Introduction - - - How to use this manual - - - Tool required for service - - - Features - - - Specifications - - - Sequence of Operation - - -...
Page 3: Introduction
Introduction The Bradford White Ultra Low NOx Atmospheric Vent Water Heater is designed to deliver a remarkable amount of hot water at 84% efficient in a quiet running unit with a low vent connection that allows for installation existing locations. Several technologically advanced design features are incorporated in the design that will require additional knowledge on the part of the qualified service provider.
Page 4: Troubleshooting
It is intended for this manual to be used by qualified service personal for the primary purpose of troubleshooting analysis and repair of the Bradford White Ultra Low NOX Atmospheric Vent Water Heater. Understanding the sequence of operation section of this manual will contribute greatly to troubleshooting this product.
Page 5 Features of Honeywell Integrated Control System Attractive digital water heater display on control panel for setting and displaying the temperature setpoint. Pressing temperature UP and DOWN buttons changes the temperature setpoint. Same water heater display used on all models. Temperature format may be displayed in °F or °C.
Page 6 Dimensional Layout Model Description Water Relief Floor to Vent Floor Floor Floor Floor to Floor Conn. Conn. Valve Hour Top of Dia. to Hot Top of to Gas Dia. Dia. (in.) Input BTU/Hr. Delivery at Vent (in) Cold T& P Water Water Conn.
Page 7 Honeywell Integrated Control System Power supply Dedicated 120 VAC, 60 Hz, 15A Minimum ¾”NPT for 300,000 BTU’s/hr. and below. Minimum 1" NPT for 399,999 BTU’s/hr. Gas Supply (schedule 40 black iron pipe recommended) Natural gas only. Gas supply must match the gas type listed on the water Approved Gas Type heater rating label.
Page 8 For models with Honeywell Integrated Control System w/ Direct Spark Ignition Thermostat calls for heat. Combustion blower & circulator start while the damper opens. Blower pre-purge period of 30 seconds. Trial for Ignition. (5 seconds, 3 trials). Flame establishing period (3 seconds), gas valve opens, sparks from spark rod to burner surface to ignite the gas.
Page 9 For models with Honeywell Integrated Control System w/ Direct Spark Ignition Lockout Conditions (Complete list of error codes is listed on the unit) The system will go into lock out mode for the following reasons: ERROR CODE 26 If the blocked vent safety switch mounted on the draft hood should open, the gas valve will close, the blower will post-purge and error code 26 will appear on the display.
Page 10 System Observation For models with Direct Spark Ignition Water Heater Fault: Water heater does not operate Display Error Code: Water heater display does not operate - blank display WARNING Check main power supply to water 120 volt potential exposure. Use caution heater - fuse, circuit breaker, plug receptacle, line cord or wiring to water making voltage checks to avoid personal injury.
Page 11: Combustion System Testing And Replacement
System Observation For models with Direct Spark Ignition WARNING 120 volt potential exposure. Use caution making voltage checks to avoid personal injury. From previous page CAUTION Use caution not to damage connectors when making voltage measurements or jumping terminals Replace control board if display shows “heating”...
Page 12 Accessing Service Mode on Control Display For models with Honeywell Integrated Control The display has a “service mode” for changing the maximum setpoint and accessing information in aiding servicing of the water heater. This procedure is for service and installation personnel only. To enter the Service Mode, follow the steps illustrated below: Step 1: Press “Select”...
Page 13 Accessing Service Mode on Control Display For models with Honeywell Integrated Control 1. Max Setpoint (Display/Change) Max Setpoint value in Water Heater Display °F Setpoint idle Status Operational SELECT 2. Tank Sensor Temperature Displayed Water Temperature Average. Water Temp °F idle Operational Status...
Page 14 Accessing Service Mode on Control Display For models with Honeywell Integrated Control 4. Setpoint (Display/Change) setpoint °F idle Operational Status SELECT 5. °F/°C (Display/Change) setpoint °F °F/C° idle Status Operational SELECT 6. Differential (Display only - shows the differential of the thermostat) Differential °F idle...
Page 15 Accessing Service Mode on Control Display For models with Honeywell Integrated Control 7. Software Version (Display only) Soft idle Status Operational SELECT Error Code History (Displays if there are present error codes or up to 10 previous error codes see page 22). Water Heater Display will show a “--“...
Page 16 Accessing Service Mode on Control Display For models with Honeywell Integrated Control Step 2: Press “Set” button to enter setting mode. “Max Setpoint” will flash to indicate setting mode. "Max Setpoint" Flashes °F Setpoint idle Status Operational SELECT Step 3: Press the “UP” or “DOWN” buttons to change the maximum setpoint value. This will limit the maximum setpoint the user can select.
Page 17 Accessing Service Mode on Control Display For models with Honeywell Integrated Control Step 5: 30 Seconds after the last button press, the Water Heater Display will go back to “User Mode”. It will read “Max Setpoint” without showing a temperature value if the temperature setpoint is at the maximum setting. The Water Heater Display can be set back to the “User Mode”...
Page 18 Accessing Service Mode on Control Display For models with Honeywell Integrated Control To Display Flame Sense Current of the Pilot Flame Sensor: The pilot flame sense current is available only when the burners are in operation. Step 1: Make sure the status displays “Heating”...
Page 19 Accessing Service Mode on Control Display For models with Honeywell Integrated Control Step 2: Press the “Set” button to enter the setting mode. “Setpoint” will flash in the water heater display. setpoint °F idle Operational Status SELECT Step 3: To raise the temperature setpoint, press the “Temperature Up” button until the desired temperature is shown on the water heater display.
Page 20 Accessing Service Mode on Control Display For models with Honeywell Integrated Control Step 5: When the desired setpoint is reached on the water heater display, press the “Set” button to confirm the new setpoint. “Setpoint” stops flashing in the water heater display. setpoint °F idle...
Page 21 Accessing Service Mode on Control Display For models with Honeywell Integrated Control Step 3a: Press “Temperature Up” button to change temperature format to °C °C °F/C° idle Operational Status SELECT Step 3b: Press “Temperature Down” button to change temperature format to °F °F °F/C°...
Page 22 Accessing Service Mode on Control Display For models with Honeywell Integrated Control Step 5: Pressing “Select” button will return display to setpoint in format selected (°F or °C) immediately °F idle Operational Status Lower Sensor SELECT Error Codes and Error History Display: If there is an operating problem with the water heater, an error code number will appear on the water heater display with “Service Needed”...
Page 23 Accessing Service Mode on Control Display For models with Honeywell Integrated Control To view previous error codes: Step 1: In “Service Mode press the “Select” button until the next display after the “Software Version”. If there are no current error codes, the display will show -- . °F idle Operational...
Page 24 Accessing Service Mode on Control Display For models with Honeywell Integrated Control Step 4: Press the “Temperature Down” button to change to the previous code index, code #9. idle Operational Status SELECT Step 5: Press the “Select” button for code index #9 to view if there are any code numbers.
Page 25 Error Code Definitions For models with Honeywell Integrated Control ERROR CODE DEFINITIONS If the water heater has an operating problem, there will be a number in the water 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.
Page 26 Resetting Error Codes For models with Honeywell Integrated Control WARNING The following procedure is for service and installation personnel only. Resetting lockout conditions without correcting the malfunction can result in a hazardous condition. If an error code is displayed (except for #4, low flame sense current), the water heater will be in a “lockout condition” with the water heater display showing the error code number and “Service Needed”...
Page 27 WARNING 120 volt potential exposure. Use caution making voltage checks to avoid personal injury. IMPORTANT NOTE: This procedure assumes a cool tank CAUTION Condition: Water Heater Not Operating Use caution not to damage Display shows error code “32” connectors when making voltage ( Sensor Reading Faulty) measurements or jumping terminals...
Page 28 WARNING Condition: Water Heater Not Operating Do not operate water heater without Display shows error code “65” High Water Temperature (over 200 °F) verifying that the overheating (Continued from previous page) condition has been corrected. Once cause of overheating condition has been diagnosed and corrected, the control may be reset Reconnect and switch on power to the water heater.
Page 29 APPENDIX - A Sensor Resistance at Various Temperatures Be Careful When Making Voltage Measurements or Jumping Terminals Not to Damage or Deform Connectors or Connector Pins. Draw Water From The T&P Valve. Compare Temperature With Temperature Ohms Chart Below. Example: If temperature of sensor is 84°F, then the resistance through the sensor would be 8449 (see shaded area). NOTE: Sensor resistance increases as the temperature falls.
Page 30 Thermostat Sensor (Thermister) Replacement Procedure WARNING Step 1. Position main power switch to “OFF” 120 volt potential exposure. Isolate the Step 2. Disconnect (unplug) water heater from appliance and reconfirm power is 120 volt power source. disconnected using a multi-meter. Step 3.
Page 31 Observe burner operation through the sight glass located on the combustion insert mounting flange. Normal burner operation should ignite smoothly, without evidence of coughing or huffing upon ignition. The burner flame should be a blue flame near the burner surface in a uniform flame pattern. Occasional yellow or white streaks are normal. Note: Models using metal fiber mesh burner a red glow from the burner surface is normal.
Page 32 Observe burner operation through the sight glass located on the combustion insert mounting flange. Normal burner operation should ignite smoothly, without evidence of coughing or huffing upon ignition. The burner flame should be a blue flame near the burner surface in a uniform flame pattern. Occasional yellow or white streaks are normal. WARNING Continued from 120 volt potential exposure.
Page 33 WARNING Heater components may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. Combustion System Removal Procedure Step 1. Position main power switch to “OFF”. WARNING Step 2. Disconnect (unplug) water heater from 120 volt potential exposure.
Page 34 Combustion System Replacement Procedure Step 1. Fully inspect burner gasket for the following: a) Tears d) Dirt or debris b) Missing material e) Other imperfections that would inhibit proper seal c) Cracks If gasket is NOT affected by any of the above, gasket replacement is not required. Step 2.
Page 35 WARNING Heater components may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. Burner Tube Removal Procedure WARNING Step 1. Position main power switch to “OFF”. 120 volt potential exposure. Isolate the appliance and reconfirm power is Step 2.
Page 36: Burner Tube Inspection & Replacement
WARNING Heater components may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. Burner Tube Inspection Step 1. a) Outer fiber mesh should be uniform with no tears or deterioration. b) Gently squeeze burner tube, Burner tube should feel firm without any soft areas around the sides or at the bottom.
Page 37: Gas Valve Replacement
Gas Valve Replacement Procedure Step 1. Position main power switch to “OFF”. WARNING Step 2. Disconnect (unplug) water heater from 120 volt potential exposure. Isolate the 120 volt power source. appliance and reconfirm power is disconnected using a multi-meter. Step 3. Turn off gas supply to water heater.
Page 38: Ignition Module/Control Board Replacement
Is there 120VAC Does blower across the white and Refer to ignition module/control board Replace energize? black wires at location illustration. ignition module/ (For Direct Spark P3 on the control Is there 120VAC between P7(5) and P7(3)? control board. Ignition models, board ? ensure control display (see photo at bottom)
Page 39 Blower Replacement Procedure WARNING Step 1. Position main power switch to “OFF”. 120 volt potential exposure. Isolate the Step 2. Disconnect (unplug) water heater from appliance and reconfirm power is 120 volt power source. disconnected using a multi-meter. Step 3. Turn off gas supply to water heater.
Page 40 WARNING Flame Sensor Testing Procedure 120 volt potential exposure. Use caution making voltage checks to avoid personal injury. Flame sensor may be too hot to handle, take necessary precautions Refer to ignition module/control board Refer to illustration below, is there illustration.(24 volts should maintain beyond the a minimum of 1 micro amp during Flame sensing circuit OK...
Page 41 Flame Sensor Replacement Procedure WARNING 120 volt potential exposure. Isolate the Step 1. Position main power switch to “OFF” appliance and reconfirm power is Step 2. Disconnect (unplug) water heater disconnected using a multi-meter. from 120 volt power source. Step 3. Un-latch &...
Page 42 Spark Rod Replacement Procedure WARNING 120 volt potential exposure. Isolate the Step 1. Position main power switch to “OFF” appliance and reconfirm power is Step 2. Disconnect (unplug) water heater from 120 volt power disconnected using a multi-meter. source. Step 3. Un-latch &...
Page 43: Ignition Module/Control Board Replacement
Control Board Replacement WARNING 120 volt potential exposure. Isolate the Step 1. Position main power switch to “OFF” appliance and reconfirm power is Step 2. Disconnect (unplug) water heater from 120 disconnected using a multi-meter. volt power source. Step 3. Un-latch and remove top surround cover from top of water heater.
Page 44: Transformer Replacement
Transformer Replacement Procedure WARNING 120 volt potential exposure. Isolate the appliance and reconfirm power is Step 1. Position main power switch to “OFF” disconnected using a multi-meter. Step 2. Disconnect (unplug) water heater from 120 volt power source. Step 3. Un-latch and remove top surround cover Step 4 Remove wires to...
Page 45: Anode Inspection And Replacement
Anode inspection and replacement WARNING Heater components and stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. Step 1. Position main power switch to “OFF” Step 2. Disconnect (unplug) water heater from 120 volt power source.
Page 46 Step 1. When Error Code 29 is present you first must determine if the circulator or flow switch is bad. Circulator (120V) Step 2. Check if there is 120V to the circulator harness (see picture below). If voltage is not present trace wire harness for any sign of damage.
Page 47 Step 1. First determine is the “Blocked Vent Switch” was installed correctly on the drafthood (see picture right). Step 2. When Error Code 26 is present you first must determine if there is a blocked vent condition present. If so, clear the obstruction and reset the switch then continue with normal operation.
Page 48 WARNING Step 1. Un-latch and remove top surround cover 120 volt potential exposure. Isolate the from top of water heater. appliance and reconfirm power is Step 2. Locate the damper at the back of the units. If the disconnected using a multi-meter. damper is working properly intake air should be pulling in through the screened elbow (see picture right).
Page 49 Date Service Provider Model Number Phone Number Serial Number Venting: Vent 6", 7" or 8" Horizontal length Vertical length Gas Line: Gas Pressure: Venturi: Size & material Setting from Bottom in Turns Static Distance from meter Running Inlet to water heater Manifold Electrical: Line Voltage...
Page 50 U Model – Water Heater 1 Surround Assembly Combustion Assembly (Specify model) 3 Ignition Control Assembly 4 Draft Hood (Specify model) 5 Vent Vertical Tube 6 Vent Protector Assembly 7 Baffle 3” Flue (Specify Model) 8 Damper Bracket (Specify Model) 9 Thermostat Sensor 10 Utility Cover 11 Circulator Assembly...
Page 51 Combustion Assembly Combustion Assembly (Specify model) 14 Igniter – Direct Spark Ignition Blower/Gas Valve Assembly (Specify model) 15 Blower / Burner Mounting Plate 3 Burner Assembly (Specify model) 16 Gasket Burner (Specify Model) 4 Blower – (Specify model) 17 Burner (Specify Model) 5 Damper Assembly (Specify Model) 18 Burner Mount Assembly 6 Transition Tube...
Page 52 Ignition Control Assembly and Harnesses Control Panel Controller Harness (24V) Control Power Cord Harness (120V) Transformer Blocked Vent Switch Harness (24V) Display Panel T-Stat Harness (24V) Screw Control Display Harness (24V) Switch Main Power Blower Harness (120V) Control Display Circ/Flow Harness (120V) Screw BVS/Damper/Flow Harness (24V) Blower/Circ/Damper...
Page 53 Alternating Current BTU/H British Thermal Units Carbon Monoxide Carbon Dioxide Direct Current Direct Spark Ignition Energy Cut Off Ground fault interrupt Gallons per Minute Hot Surface Igniter Hertz Light Emitting Diode Oxides of Nitrogen National Pipe Thread Pounds per Square Inch Revolutions per Minute Volt Amps Volts Alternating Current...
Page 54 NOTES...
Page 55 NOTES...

Bradford White U65L155E N Series Service Manual

Quick Links

Related Manuals for Bradford White U65L155E N Series

Summary of Contents for Bradford White U65L155E N Series

This manual is also suitable for:

Table of Contents