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Manual 238-51617-00A
High EF
Atmospheric Vent Gas Water Heater
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
RG2F40S*(N,X)
RG2F50S*(N,X)
(*) Denotes Warranty Years
Save this manual for future reference
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Table of Contents
Related Manuals for Bradford White RG2F40S*(N,X)
Summary of Contents for Bradford White RG2F40S*(N,X)
- Page 1 High EF Atmospheric Vent Gas Water Heater SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) Models Covered by This Manual: RG2F40S*(N,X) RG2F50S*(N,X) (*) Denotes Warranty Years Manual 238-51617-00A Save this manual for future reference...
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Page 2: Table Of Contents
Table of Contents Section Page Introduction ______________________________________________ 5 How to Use this Manual _____________________________________ 6 Tools Required for Service ___________________________________ 6 Specifications _____________________________________________ 7 Sequence of Operation _____________________________________ 9 Power Up Sequence Normal Heating Sequence Abnormal Operation Troubleshooting __________________________________________ 13 Burner Maintenance _______________________________________ 15 Burner Inspection Burner Cleaning Procedure... - Page 3 WARNING If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or death. What to do if you smell gas: Do not try to light any appliance Do not touch any electrical switch; do not use any phone in your building Immediately call your gas supplier from a neighbor’s phone.
- Page 4 WARNING Water heaters are heat producing appliances. To avoid damage or injury, do not store materials against the water heater or any of its components. Use proper care to avoid unnecessary contact, especially by children, with the water heater and its components. Under no circumstances must flammable materials, such as gasoline or paint thinner be used or stored in the vicinity of this water heater or in any location in which the fumes could reach the water heater.
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Page 5: Introduction
Bradford White DEFENDER Safety System. Introduction The new Bradford White High EF atmospheric vent gas water heaters are designed to provide reliable performance with enhanced standard features. New design features include reliable spark-to-pilot ignition system, enhanced diagnostics, simplified servicing, and the Bradford White Defender Safety System. -
Page 6: How To Use This Manual
It is intended for this manual to be used by qualified service personnel for the primary purpose of troubleshooting and repair of the Bradford White High EF atmospheric gas water heaters. Understanding the sequence of operation section of this manual will contribute greatly to troubleshooting the water heater. -
Page 7: Specifications
Specifications Power Supply Dedicated 120VAC, 60 Hz, 15A Minimum 1/2” (Schedule 40 black iron pipe Gas Supply Pipe recommended) Approved Gas Type Natural or Propane; unit must match gas type supplied 5” w.c. minimum for Natural Gas; 11” w.c. for Propane; Gas Pressure 14”... -
Page 8: Control Timings
Specifications Control Timings Ignition State Timing Pre-purge 15 seconds Trial for Ignition 90 seconds Flame Stabilization Period 3 seconds Interpurge 15 seconds 1.5 seconds (2 second maximum; 1 second mini- Flame Failure Response Time mum) Postpurge 15 seconds Pressure Switch Fault Delay (failed open/close) Retry after 2 minutes Soft Lockout Retry after 5 minutes... -
Page 9: Sequence Of Operation
Sequence of Operation Power Up Sequence 1. Start-up: Upon power up, the gas control runs a safe start check with a typical delay of 5 seconds. 2. Flammable Vapor Verification: The gas control verifies that the Flammable Vapor Sensor is in the proper operating range prior to energizing any components. If the sensor is within the proper range, the gas control resumes normal operation. -
Page 10: Abnormal Operation
Sequence of Operation Normal Heating Sequence (cont’d) 7. Steady State Operation: During steady state operation, the gas control monitors: Temperature Sensor: When the setpoint temperature is satisfied, the gas control is shutdown, and the blower will postpurge for 15 seconds. The gas control LED flashes a short flash once every 4 seconds (Idle status code). - Page 11 Sequence of Operation Abnormal Operation (cont’d) 2. Temperature Sensor Fault: A) Temperature Sensor Open Circuit: The gas control immediately turns off all outputs and proceeds to flash 8 times then 2 times with a 3 second pause. The status self clears if the fault clears for at least 15 seconds. B) Temperature Sensors Not Reading the Same Temperature within ±5°F: The gas control immediately turns off all outputs and proceeds to flash 8 times then 2 times with 3 second pause.
- Page 12 Sequence of Operation Abnormal Operation (cont’d) 4. Trial for Ignition Fault: A) Pressure Switch / Blower Temperature Switch Opens During Trial: The gas control stops the trial for ignition. The gas control monitors the pressure switch until it closes. If the pressure switch closes within 30 seconds, the gas control will continue with the trial for ignition starting at blower pre-purge.
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Page 13: Troubleshooting
Troubleshooting Observe the green LED on the water heater gas control. Status codes are displayed with a 3 second pause before repeating. Once the status code is known, check and repair the water heater, as recommended in the table below. LED Status Control Status Probable Cause... - Page 14 Troubleshooting LED Status Control Status Probable Cause Service Procedure 1. Vent blockage or improper vent configuration Pressure switch or 2. Pressure switch tubing kinked or 1. See Burner Inspection on Six flashes, two blower temp switch blocked flashes, three opened during page 15 3.
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Page 15: Burner Maintenance
Burner Maintenance Burner Inspection At periodic intervals (every 6 months), a visual inspection should be made of the pilot and main burner for proper operation and to assure no debris is accumulating. The pilot flame should be stable. Some causes for an unstable pilot flame are: a) Gas pressure is out of specification. - Page 16 Burner Maintenance Burner Cleaning Procedure (cont’d) Step 5. Remove the (4) 1/4” hex drive screws holding the right side inner door in place. (4) 1/4” hex drive screws Right side inner door Step 6. Disconnect the pilot tube using a 7/16” wrench and the main burner feedline with a 3/4”...
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Page 17: Pilot Maintenance
Pilot Maintenance Burner Cleaning Procedure (cont’d) Step 12. Reassemble the burner assembly and reinstall into the water heater. Restore gas supply and check for gas leaks. Step 13. To resume operation, follow the instructions located on the water heater lighting instruction label. Or, use the lighting instructions located in the water heater installation and operating manual. - Page 18 Pilot Maintenance Pilot Inspection, Testing and Replacement (cont’d) Step 7. Disconnect the spark igniter/flame sensor wire from gas control. Gas control Spark igniter/flame sensor wire Step 8. Remove the burner assembly from the combustion chamber. Burner assembly Step 9. Remove the pilot assembly from the main feedline using a 1/4"...
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Page 19: Blower Replacement
Blower Replacement Pilot Inspection, Testing and Replacement (cont’d) Step 14. Visually inspect the pilot tubing for kinks or cracks. If damage is found, replace the pilot assembly. Step 15. Inspect the pilot tubing and pilot orifice for blockages: a) Remove ferrule nut from the bottom of the pilot assembly using a 7/16"... - Page 20 Blower Replacement Blower Removal & Installation (cont’d) Step 3. Disconnect the vent system from the draft hood that is mounted on top of the blower. Vent system Step 4. Remove the draft hood from the blower and retain it for use on the new blower. Draft hood Blower Step 5.
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Page 21: Gas Control Testing & Replacement
Gas Control Testing & Replacement Blower Removal & Installation (cont’d) Step 13. Reconnect the cord sets from Step 5. Step 14. Plug the water heater into the wall outlet. Step 15. To resume operation, follow the instructions located on the water heater lighting instruction label. -
Page 22: Gas Control Removal
Gas Control Testing & Replacement Gas Control Removal Step 1. Move the gas control power switch to the “OFF” position. Gas control power switch Step 2. Unplug the water heater from the wall outlet. Blower (water heater) power cord Step 3. Drain the water heater to a point below the gas control level. -
Page 23: Flammable Vapor Sensor Testing
120 VAC Circuit Trace Flammable Vapor Sensor Testing CAUTION Do not use standard multi-meter probes for this testing. Doing so will damage the con- nector. Use special pin type electronic probes or small diameter wire pins inserted into connector. Step 1. Move the gas control power switch to the “OFF”... -
Page 24: Diptube Inspection
Diptube Inspection Diptube Inspection and Replacement Step 1. Move the gas control power switch to the “OFF” position Step 2. Unplug the water heater from the wall outlet. Step 3. Turn off the cold water supply to the water heater. Connect a hose to the drain valve of the water heater and route to an open drain. -
Page 25: Anode Inspection
Anode Inspection Anode Inspection and Replacement Step 1. Move the gas control power switch to the “OFF” position Step 2. Unplug the water heater from the wall outlet. Step 3. Turn off the cold water supply to the water heater. Connect a hose to the drain valve of the water heater and route to an open drain. - Page 26 Anode Inspection Step 2. Unplug the water heater from the wall outlet. Blower (water heater) power cord Step 3. Disconnect the vent system from the draft hood that is mounted on top of the blower. Vent system Draft hood Blower Step 4.
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Page 27: Blower Removal
Blower Removal Remove the Blower to Gain Access to the Flue Baffle (cont’d) Blower Top of water heater Water heater tank flue Step 6. Remove the blower from the top of the water heater. Flue baffle Step 7. Remove the flue baffle from the water heater. Step 8. -
Page 28: Inner Door Removal
Inner Door Removal Inner Door Removal Procedure Step 1. Move the gas control power switch to the “OFF” position. Gas control power switch Step 2. Unplug the water heater from the wall outlet. Blower (water heater) power cord Step 3. Remove the outer door. - Page 29 Inner Door Removal Inner Door Removal Procedure (cont.) Step 5. Remove (2) 1/4” drive screws from the left side inner door. Left side inner door 1/4” hex drive screws Step 6. Remove the connectors attached to the resettable thermal switch on the right side inner door.
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Page 30: Inner Door Gasket Replacement
Inner Door Gasket Replacement Inner Door Gasket Replacement Procedure WARNING If the information in these instructions is not followed exactly, a fire or explosion may re- sult causing property damage, personal injury, or death. Step 1. Completely remove all gasket and adhesive residue from the right and left side inner doors, as needed. -
Page 31: Inner Door Installation
Inner Door Installation Inner Door Installation with Gasket WARNING Stripped fastener connections may allow for an inner door seal breach. A seal breach may result in a fire or explosion, causing property damage, personal injury, or death. Do not over tighten screws. If a fastener connection is stripped, contact the manufacturer listed on the water heater rating plate. -
Page 32: Pressure Switch Testing & Replacement
Pressure Switch Testing Pressure Switch Testing & Replacement Step 1. Move the gas control power switch to the “OFF” position. Gas control power switch Step 2. Unplug the water heater from the wall outlet. Blower (water heater) power cord Step 3. Unplug the cord sets from the blower. - Page 33 Pressure Switch Testing Pressure Switch Testing & Replacement (cont’d) Step 7. Using a slotted screwdriver, remove the (2) screws holding the pressure to the blower junction box. Retain the screws for later use. Pressure switch screws Step 8. Pull the pressure switch out of the junction box. Pressure switch Step 9.
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Page 34: Arrestor Cleaning
Arrestor Cleaning Pressure Switch Testing & Replacement (cont’d) Step 21. To resume operation, follow the instructions located on the water heater lighting instruction label. Or, use the lighting instructions located in the water heater installation and operating manual. ® ScreenLok Flame Arrestor Cleaning Procedure Step 1. -
Page 35: Common Terms
Common Terms Common Terms British Thermal Units Energy Cut Off Gallons per Minute Hertz Kilowatts per hour Light Emitting Diode National Pipe Thread Ohms Ohms of resistance Pounds per Square Inch Revolutions per Minute Volts Alternating Current W.C. Inches of Water Column °C Degrees Centigrade °F... -
Page 36: Parts List
Parts List PART NAME AND DESCRIPTION 1. Dra Hood 15. Inner Door (Right) 2. Jacket Head Pan 15A. Rese able Thermal Switch 3. Jacket 16. Inner Door (Le ) 4. Blower 17. Blower Wire Harness 5. Heat Trap—Outlet 18. Feedline 6.