Bradford-White D4403S'F(BN User Manual

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R dential Flue Damper

Ga

r Heate

S ICE MANUAL

T eshooting Guide a structions for Service

(To be performed ONLY by

qua

ce providers)

M

Covered

b

 

D4403S

D4504S

(*) Denotes Warra y Years

M

l 238-48385-00A

Save this manual for future reference

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

Pilot Maintenance _________________________________________ 17 Pilot Inspection, Testing and Replacement

Damper Replacement______________________________________ 19 Thermal Well Testing ______________________________________ 21 Determine Water Temperature Inside Tank_____________________ 22 Component Disassembly ___________________________________ 23 Gas Control Removal ______________________________________ 24 Gas Control Assembly _____________________________________ 25 Flammable Vapor Sensor Testing_____________________________ 27 120 VAC Circuit Trace _____________________________________ 27 Diptube Inspection ________________________________________ 28 Anode Inspection _________________________________________ 29 Damper Removal _________________________________________ 31 Inner Door Removal_______________________________________ 32 Inner Door Gasket Replacement _____________________________ 33 Inner Door Installation_____________________________________ 34 Arrestor Cleaning _________________________________________ 35 Damper Relay Installation __________________________________ 35 Common Terms __________________________________________ 38 Notes __________________________________________________ 38 Parts List _______________________________________________ 39

Page 2

2

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:

xDo not try to light any appliance

xDo not touch any electrical switch; do not use any phone in your building

xImmediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.

xIf you cannot reach your gas supplier, call the fire department.

Installation and service must be performed by a qualified installer, service agency, or the gas supplier.

DANGER

Do not store or use gasoline or other flammable, combustible, or corrosive vapors and liquids in the vicinity of this or any other appliance.

CAUTION

Incorrect operation of this water heater may create a hazard to life and property and will nullify the warranty.

If sweat fittings are to be used, DO NOT apply heat to the nipples on top of the water heater. Sweat the tubing to the adapter before fitting the adapter to the water connections. It is imperative that heat is not applied to the nipples containing a plastic liner.

Turn off or disconnect the electrical power supply to the water heater before servicing. Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.

NOTICE

Before proceeding, please inspect the water heater and its components for possible damage. DO NOT install any water heater with damaged components. If damage is evident, then please contact the supplier where the water heater was purchased or the manufac-

Page 3

3

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.

Hydrogen gas can be produced in an operating water heater that has not had water drawn from the tank for a long period of time (generally two weeks or more). Hydrogen gas is extremely flammable. To prevent the possibility of injury under these conditions, we recommend a hot water faucet to be open for several minutes at the kitchen sink before you use any electrical appliance which is connected to the hot water system. If hydrogen is present, there will be an unusual sound such as air escaping through the pipes as hot water begins to flow. Do not smoke or have open flame near the faucet at the time it is open.

DO NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU ARE NOT CERTAIN OF THE FOLLOWING:

Liquefied petroleum gases/propane gas and natural gas have an odorant added by the gas supplier that aids in the detection of the gas. Most people recognize this odor as a “sulfur” or “rotten egg” smell. Other conditions, such as “odorant fade” can cause 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 supplier from a neighbor's telephone. Gas detectors are available. Contact your gas supplier, or plumbing professional for more information.

FAILURE TO INSTALL AND MAINTAIN A NEW, LISTED 3/4” X 3/4” TEMPERATURE AND PRESSURE RELIEF VALVE WILL RELEASE THE MANUFACTURER FROM ANY CLAIM THAT MIGHT RESULT FROM EXCESSIVE TEMPERATURE AND PRESSURES.

Page 4

4

Introduction

The Bradford White DEFENDER Safety System®

The Bradford White DEFENDER Safety System was designed to resist the ignition of flammable vapors that can occur outside of the water heater. Use and installation are nearly identical to previous versions of atmospherically fired and vented water heaters. A number of exclusive design features are incorporated in the system that will require additional knowledge on the part of the qualified service provider. The following information will instruct service professionals on the function, proper diagnosis, and repair of water heaters employing the Bradford White DEFENDER Safety System.

Introduction

The new Bradford White Residential Flue Damper water heaters are designed to provide reliable performance with enhanced standard features. New design features include reliable spark- to-pilotignition system, enhanced diagnostics, simplified servicing, significantly quiet operation, and the Bradford White Defender Safety System.

Spark-to-Pilot Ignition System - employing thespark-to-pilotignition system promotes reliable and consistent pilot and main burner ignitions to provide hot water on demand.

Integrated Immersion Thermal Well/Gas Control with LED - was developed for ease of troubleshooting by providing simple diagnostic codes to pinpoint an installation or component performance issue.

Rugged Wiring Connections - receptacle type connections promote error free wiring.

The gas control maintains water temperature, ignition sequence, and regulates gas flow. If a situation outside of normal operating parameters exists, the gas control diagnostic LED will flash a code to positively identify an operational issue.

This service manual is designed to facilitate problem diagnosis and enhance service efficiency. To further promote quicker service times, the gas control can be removed and replaced without draining the water heater. A special tool is required and will be provided with each gas control kit shipped from your Bradford White wholesale distributor.

Please read the service manual completely before attempting service on this new series of damper models.

How the Safety System Works

During normal operation, air for combustion is drawn into the water heater through the openings in the jacket. This air travels down and around the combustion chamber and enters through holes in the very bottom of the corrosion resistant combustion chamber. The air then travels up through the flame arrestor louvers, where the velocity of the air is increased and its direction altered. The air then mixes in a normal manner with supplied gas and is efficiently combusted, producing very low NOx emissions.

In the unlikely event trace amounts of flammable vapors are present in the air flowing into the

Page 5

5

How to Use this Manual

combustion chamber, the vapors are harmlessly ignited by the burner. If flammable vapors are in sufficient quantity to prevent normal combustion, the flammable vapor sensor recognizes this and shuts down the pilot and main burner. Should the flammable vapors continue to burn, the flame arrestor prevents the flames from traveling backwards and igniting vapors outside of the combustion chamber. And, the resettable thermal switch will open and shut down the pilot and main burner.

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 Residential Flue Damper water heaters. Understanding the sequence of operation section of this manual will contribute greatly to troubleshooting the water heater.

The Honeywell WV4460E Electronic Gas Control will display error codes in the event of abnormal operation. Error codes are listed in the troubleshooting chart beginning on page 13 of this service manual. The troubleshooting chart will also indicate the probable cause for the error code and direct the service professional to a service procedure to properly diagnose the abnormal operation.

Contact the Bradford White technical support group immediately if diagnosis cannot be made using the methods described in this service manual.

Tools Required for Service

Manometer: A liquid “U” tube type or a digital(magna-helic)type can be used. This device is used to measure gas and/or air pressure and vacuum.

Multi-Meter: A digital type is strongly recommended. This device is used to measure electrical values. The meter you select must have the capability to measure volts AC, volts DC, amps,micro-ampsand ohms.

Electronic Probes: In some cases, standardmulti-meterprobes will damage or simply not be effective to obtain certain voltage and ohm reading. It will be necessary to have special electronic “pin” typemulti-meterprobes. These probes are available at most electronic wholesale outlets.

Thermometer: Used to measure water temperature. An accurate thermometer is recommended.

Water Pressure Gage: Used to measure water supply pressure. Also used to determine tank pressure by adapting to the drain valve of the heater.

Gas Control Service Tool: BWC part number239-45991-00.A specialized tool designed to remove the gas control from gas control thermal well. Available from your Bradford White parts supplier.

Various Hand Tools: Pipe wrench, channel locks, open end wrenches (3/8", 7/16", 1/2"), 12" crescent wrench, Allen wrench set, screw drivers (common & Phillips), 1/4" nut driver, pliers (common & needle nose), socket set, side cutters, wire cutters, wire strippers, wire crimpers, torpedo level, small shop vac, step ladder, flashlight, and 5 gallon pail.

Page 6

6

 

 

Specifications

 

 

 

 

 

 

 

 

 

Power Supply

Dedicated 120VAC, 60 Hz, 15A

 

 

 

 

 

 

Gas Supply Pipe

Minimum 1/2” NPT (Schedule 40 black iron pipe

 

 

recommended)

 

 

 

 

 

 

 

 

 

Approved Gas Type

Natural or Propane; unit must match gas type supplied

 

 

 

 

 

 

Gas Pressure

5” w.c. minimum for Natural Gas; 11” w.c. for Propane;

 

 

14” w.c. maximum for Natural Gas / Propane

 

 

 

 

 

 

 

 

 

Approved Vent Materials

Single or Double Wall Metal Vent Pipe

 

 

 

 

 

 

Minimum Clearance for

18” from top; 24” from front; 4” from sides and rear

 

 

Servicing

 

 

 

 

 

 

 

 

 

Water Supply Pressure

150 psi maximum allowable working pressure; check local

 

 

codes for supply pressure

 

 

 

 

 

 

 

 

 

ECO Limit

188°F (87°C)

 

 

 

 

 

 

Temperature Setpoint Range

60°F (16°C) to 160°F (71°C); approximate temperatures

 

 

 

 

 

Page 7

7

Specifications

Control Timings

 

 

Ignition State

Timing

 

 

Adjust Damper Position and Verify (Open Posi-

15 seconds

tion)

 

 

 

Trial for Ignition

90 seconds

 

 

Flame Stabilization Period

3 seconds

 

 

Re-adjustDamper Position and Verify

15 seconds

 

 

Flame Failure Response Time

1.5 seconds (2 second maximum; 1 second mini-

mum)

 

 

 

Adjust Damper Position and Verify (Closed Po-

15 seconds

sition)

 

 

 

Damper Blade Position Fault (failed open/close)

Retry after 2 minutes

 

 

Soft Lockout

Retry after 5 minutes

 

 

ECO Limit Lockout

Indefinite (See page 11 to reset)

 

 

Verify Resistive Delay

Retry after 2 minutes (repeats 5 times)

 

 

Simulated Resistive Load Lockout

Indefinite (cycle power to reset)

 

 

Hardware Error Lockout

Indefinite (self clears if fault clears for at least 15

seconds)

 

 

 

Wiring Diagram

Page 8

8

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. If the Flammable Vapor Sensor is out of range, the gas control LED immediately flashes 7 times with a 3 second pause.

Normal Heating Sequence

When the phrase “Damper Open” is used, this means that the damper blade is in the vertical position (open). Alternatively, “Damper Closed” means that the damper blade is in the horizontal position (closed). This must not be confused with the phrase “Damper Circuit Open,” as this means that the damper blade is in the horizontal position. “Damper Circuit Closed” means that the damper blade is in the vertical position, and the water heater can proceed to an ignition trial.

1.Thermostat Calls for Heat: Prior to energizing the damper, the gas control verifies the damper safety circuit to see if it is in the correct state. If the safety circuit is closed, the gas control LED flashes 2 times with a 3 second pause. The gas control waits 2 minutes. Then, the damper is powered closed. This cycle repeats until the safety circuit opens.

2.Damper Powered Open

3.Damper Safety Circuit Check: If the damper safety circuit does not close within 30 seconds, the gas control LED flashes 3 times with a 3 second pause. The damper is powered open for a maximum of 30 seconds every 2 minutes trying to close the damper safety circuit. This cycle repeats as long as there is a call for heat.

4.Damper Hold Period (15 seconds)

5.Trial for Pilot Ignition (90 seconds): The gas control lights the pilot by activating the spark igniter and gas flow to the pilot burner. If flame is not sensed within 90 seconds, the spark igniter and gas flow are deactivated. The damper will remain open, and the gas control LED flashes 6 times with a 3 second pause.

6.Main Burner Ignition: After pilot flame is sensed, the gas control activates the main valve for main burner ignition. The gas control will ignore flame signals for 3 seconds to allow for the main burner to stabilize.

Page 9

9

Sequence of Operation

Normal Heating Sequence (cont’d)

7.Steady State Operation: During steady state operation, the gas control monitors:

Thermostat Temperature Sensor: When the setpoint temperature is satisfied, the gas control is shutdown, and the damper is powered closed. The gas control LED flashes a short flash once every 4 seconds (Idle status code).

Damper Position: If the damper position is altered during a call for heat, the pilot and main valves are shutdown. The damper is powered open attempting to close the damper safety circuit. The gas control LED flashes 3 times with a 3 second pause.

Flame Sensor: If flame is lost, the pilot and main valves are shutdown. The damper is powered open. The gas control attempts to re-lightthe pilot 4 times. If unsuccessful, the damper is closed, and the gas control proceeds to a 5 minute lockout. The gas controlre-attemptsto light the pilot starting at Normal Heating Sequence #2.

8.Thermostat Satisfies: Gas control LED flashes once every 4 seconds.

9.Burner Off

10.Damper Powered Closed (15 seconds)

Abnormal Operation

1.Flammable Vapor Sensor Fault:

A)If the resistance is greater than 70,000 ohms: The gas control immediately turns off all outputs. The gas control waits and monitors resistance for 30 seconds. If the resistance is greater than 65,000 ohms after 30 seconds, the gas control proceeds to verify resistive delay for 2 minutes and flashes 7 times then 1 time with a three second pause. This process is repeated 5 times until the control either returns to normal operation or proceeds to flammable vapor lockout.

B)If the resistance is below 3000 ohms: The gas control immediately turns off all outputs and proceeds to flash 8 times then 1 time with a three second pause. The error self clears if the resistance returns to normal range for at least 15 seconds.

Page 10

10

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 3 times with a three second pause. The error self clears if the fault clears for at least 15 seconds.

B) Thermal well sensors not reading the same temperature within ±5.5°F: The gas control immediately turns off all outputs and proceeds to flash 8 times then 3 times with three second pause. The error self clears if the fault clears for at least 15 seconds.

C) Water Temperature in excess of ECO (Energy Cut Off) Limit: The gas control immediately turns off the pilot and main valves. The gas control LED proceeds to flash 4 times with a 3 second pause.

To reset the gas control, rotate the setpoint knob to the minimum setting for at least 6 seconds before returning to desired temperature setting.

3.Damper Safety Circuit Fault:

A)Damper Failed to Open: The gas control proceeds to flash 3 times with a three second pause. The gas control waits 5 minutes, and then tries to open the damper again.

B)Damper Failed to Close: The gas control proceeds to flash 2 times with a three second pause. The gas control waits 5 minutes, and then tries to open the damper again.

4.Trial for Ignition Fault:

A)Damper Jostled During Trial: The gas control stops the trial for ignition. The gas control proceeds to flash 3 times with a three second pause. The gas control waits 5 minutes, and then tries to open the damper again.

B)Flame Not Sensed: The gas control energizes the spark igniter attempting to light the pilot and prove flame. If flame is not sensed within 90 seconds, the spark igniter turns off, the pilot valve is closed. The gas control LED flashes 6 times then 1 time with 3 second pause. The control waits 5 minutes before repeating the ignition sequence.

Page 11

11

Sequence of Operation

Abnormal Operation (cont’d)

5.Flame Sensing Fault:

A)Flame Lost During Run: The gas control turns off pilot and main valves. The gas control increments the recycle count, if the recycle count has not reached its limit (4), another trial for ignition begins. If the recycle count has been reached, the gas control LED flashes 6 times then 3 times with a 3 second pause. The gas control waits 5 minutes before repeating the ignition sequence.

B)Flame Sensed Out of Sequence: The gas control only looks for pilot flame when the damper is in the open position. If flame is present when the pilot valve is not open, the gas control proceeds to wait for flame loss and flashes 5 times with 3 second pause. This continues until flame is lost. Once the flame signal is lost, the control flashes 6 times then 4 times with a 3 second pause. The control waits 5 minutes before repeating the ignition sequence.

Page 12

12

Troubleshooting

Observe the green LED on the water heater gas control. Error codes are displayed with a 3 second pause before repeating. Once the error code is known, check and repair the water heater, as recommended in the table below.

Green LED

LED Status

Control Status

 

Probable Cause

Service Procedure

None (LED

Electrical power not

Control power switch in "OFF"

Turn Power On

not on or

present

position.

flashing)

Supply voltage interrupted.

 

 

 

One short

Stand-bymode,

Temperature demand is satisfied

 

flash every

Thermostat is

Normal operation

four seconds

satisfied (no faults)

(no call for heat)

 

Alternates

 

 

 

 

bright and

Thermostat calling

Tank temperature below

Normal operation

dim

for heat (no fault)

setpoint of thermostat

 

(heartbeat)

 

 

 

 

 

 

1.

Unstable pilot

 

 

 

2.

Pilot tube blocked or restricted

1. See Burner Inspection on

Short flash

Weak pilot signal

3.

Oxidation build-upon pilot

page 15

once every

electrode

2-4.See Pilot Inspection,

second

on last call for heat

4.

Wire damage to pilot

Testing and Replacement on

 

 

assembly or bad connection at

page 17

 

 

gas control

 

 

 

 

 

 

 

 

1.

Damper not in proper position

1. Verify cord sets are fully

Two flashes,

 

or malfunctioning - stuck in open

plugged in

three second

Damper test circuit

position

2. Verify switch on damper is

pause

not working

2.

Obstructed venting

in "Automatic" position

 

3. Verify that damper and

 

 

3.

Faulty damper

 

 

venting is not obstructed

 

 

 

 

Three

 

1.

Damper not in proper position

1. Verify cord sets are fully

 

or malfunctioning - not reaching

plugged in

flashes,

Damper test circuit

2. Verify switch on damper is

full open position

three second

not working

2.

Obstructed venting

in "Automatic" position

pause

 

3. Verify that damper and

 

3.

Faulty damper

 

 

venting is not obstructed

 

 

 

 

Four flashes,

Excessive tank

1.

Thermal well sensor out of

1. Test Gas Control & Thermal

temperature,

Well

three second

calibration

system must be

2. Replace gas control if

pause

2.

Faulty gas control

reset

necessary

 

 

 

Five flashes,

False pilot flame

 

 

 

three second

Pilot valve stuck in open position

Replace gas control

present

pause

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.

Unstable pilot

 

Six flashes,

 

2.

Pilot tube block or restricted

1. See Burner Inspection on

one flash,

Failed to light pilot,

3.

Oxidation build-upon pilot

page 15

three second

system resets after

electrode

2-4.See Pilot Inspection,

pause (Soft

(5) minutes

4.

Wire damage to pilot

Testing and Replacement on

Lockout)

 

assembly or bad connection at

page 17

 

 

gas valve

 

 

 

 

 

Page 13

13

Troubleshooting

LED Status

Control Status

 

Probable Cause

Service Procedure

 

 

1.

Damper not in proper position

 

Six flashes,

Damper test circuit

or malfunctioning - damper

1. See Burner Inspection

not working

moved from full open position

two flashes,

on page 15

properly during

during run cycle

three second

2-4.See Pilot Inspection,

burner operation,

2.

Obstructed venting

pause (Soft

Testing and Replacement

system auto resets

3.

Faulty damper

Lockout)

after (5) minutes

4.

Damper jostled during run

on pate 17

 

 

 

 

cycle

 

 

 

1.

Unstable pilot

 

Six flashes,

 

2.

Pilot tube block or restricted

1. See Burner Inspection

 

3.

Oxidation build-upon pilot

on page 15

three

Pilot flame

electrode

2-4.See Pilot Inspection,

flashes,

extinguished,

4.

Wire damage to pilot

Testing and Replacement

three second

system auto resets

pause (Soft

after (5) minutes

assembly or bad connection at

on page 17

gas control

5. Refer to Installation &

Lockout)

 

 

5.

Insufficient combustion air

Operation Manual

 

 

 

 

6.

Insufficient gas pressure

 

Six flashes,

Undesired false

 

 

 

four flashes,

 

 

 

pilot flame sensed,

Pilot valve stuck in open position

Replace gas control

three second

pause

system auto resets

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.

Flammable vapor present

 

 

Flammable vapor

2. Flammable vapor sensor

 

Seven

sensor or

exposed to excessive moisture

 

flashes,

resettable thermal

3.

Flammable vapor sensor

See Flammable Vapor

three second

switch fault

exposed to extreme ambient

Sensor Testing on page 27

pause

detected, see

temperature

 

 

warning label

4.

Resettable thermal switch

 

 

 

open

 

 

 

1.

Flammable vapor sensor out

 

Eight

Flammable vapor

of specification; verify Flammable

 

flashes, one

Vapor Sensor (FVS) resistance is

 

sensor out of

See Flammable Vapor

flash, three

specification,

not below 25 k .

Sensor Testing on page 27

second

2.

Possible short in flammable

possible short

 

pause

vapor sensor or resettable

 

 

 

 

 

thermal switch wiring

 

 

 

1.

Damage to thermal well wires

 

Eight

 

2.

Thermal well sensor

 

Thermal well sensor

resistance out of range

 

flashes,

 

damaged or

3.

Replace thermal well

 

three

See Thermal Well Testing

unplugged or gas

4.

Verify control is not wet or

flashes,

on page 21

control electronics

physically damaged

three second

 

pause

fault detected

5.

Reset control on/off switch

 

 

6.

Replace gas control if 8-3error

 

 

 

 

 

 

persists

 

 

 

 

 

 

Eight

 

1.

Verify control is not wet or

1. Replace gas control if

flashes, four

 

physically damaged

Gas control fault

wet or physically damaged

flashes,

2.

Reset control on/off switch

detected

2. Cycle power

three second

3.

Replace gas control if 8-4error

pause

 

persists

3. Replace gas control

 

 

 

 

 

 

 

Page 14

14

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.

b)Pilot flame not fully engulfing spark/flame sensor.

The main burner should light smoothly from the pilot and burn with a blue flame with a minimum of yellow tips.

Steel burner models self adjust air to gas ratio mixture and do not have an adjustable air shutter. The main burner must be free from any debris accumulation that may effect burner operation (See Burner Cleaning Procedure on page 15).

Burner Cleaning 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.

Damper (water heater) power cord

Step 3. Turn off the gas supply to the water heater.

Step 4. Remove the outer door.

Outer door

Page 15

15

Main feedline
Step 11. Remove the main burner orifice from the main feedline using a 1/2” wrench. Inspect the orifice and clean or
replace, if necessary.
1/2” wrench
Page 16
Unscrew the burner from the main burner orifice.
Step 10.
Burner assembly
Burner surface area and burner ports
Step 9. Thoroughly inspect the burner surface area burner port area and remove any loose debris.
Remove the burner assembly from the combustion
Step 8. chamber.
Disconnect the spark igniter/flame sensor wire from
Gas control
Spark igniter/flame sensor wire
Step 7. gas control.
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
Step 6. Disconnect the pilot tube using a 7/16” wrench and the main burner feedline with a 3/4” wrench from the gas
control.
Pilot and main feedlines

Right side inner door

Main burner orifice

16

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.

Pilot Inspection, Testing and 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.

Damper (water heater) power cord

Step 3. Turn off the gas supply to the water heater.

Step 4. Remove the outer door.

Outer door

Step 5. Remove the (4) 1/4” hex drive screws holding the right side inner door in place.

(4) 1/4” hex drive screws

Step 6. Disconnect the pilot tube using a 7/16” wrench and the main burner feedline with a 3/4” wrench from the gas control.

Pilot and main feedlines

Right side inner door

Page 17

17

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" nut driver.

Pilot assembly

1/4” nut driver

Step 10. Visually inspect the spark igniter/flame sense wire for damage. Replace the pilot assembly, if damage is found.

Step 11. With a multi-meterset to the ohms setting, continuity through the spark igniter/flame sense wire. the pilot, if there is no continuity.

Multi-meter

Step 12. Visually inspect the spark igniter/flame sense electrode for deterioration. Replace the pilot assembly, if necessary. The electrode should not be in contact with pilot hood. If it is in contact with the pilot hood, carefully adjust electrode to a gap distance of 3/32" from the pilot hood.

Step 13. Visually inspect the spark igniter/flame sense electrode for oxidation build up. Carefully clean any oxidation using very fine emery cloth.

Page 18

18

Damper 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" wrench.

b) Remove the pilot tube and pilot orifice.

c) Inspect the pilot tubing and pilot orifice for blockages. Clean or replace, as necessary.

Step 16. Reassemble the pilot assembly and install it on the main feedline. Reinstall the burner assembly into the combustion chamber. Restore the gas supply and check for gas leaks.

Step 17. 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.

Damper Removal & Installation

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.

Damper (water heater) power cord

Page 19

19

Damper Replacement

Damper Removal & Installation (cont’d)

Step 3. Disconnect the vent system from the draft hood that is mounted on top of the damper.

Vent system

Step 4. Remove the draft hood from the damper and it for use on the new damper.

Draft hood

Damper

Step 5. Unplug the cord sets from the damper.

Cord sets

Step 6. Remove the two damper mounting screws using a 1/4” nut driver and retain for later use.

1/4” nut driver

Step 7.

Remove the damper from the top of the water

heater.

Damper

Top of water heater

Water heater tank flue

Step 8. Clean any debris from the jacket head of the water heater.

Step 9. Set the new damper with in place using the water heater tank flue and the screw holes in the jacket head.

Step 10 Secure the damper in place using the screws from Step 6. Step 11. Re-installthe draft hood from Step 4.

Step 12. Reconnect the vent system to the draft hood.

Page 20

20

Thermal Well Testing

Damper 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. Move the gas control power switch to the “ON” position. Step 16. Verify proper damper operation.

Thermal Well Testing

CAUTION

Do not use standard multi-meterprobes for this testing. Doing so will damage the connector. Use special pin type electronic probes or small diameter wire pins inserted into connector.

Follow the procedure, below, if the water heater gas control has gone into a ECO lockout (4 flash, 3 second pause). Reset the gas control by rotating the setpoint knob to the minimum setting for at least 6 seconds before returning to the desired water temperature setting.

Step 1. Unplug the thermal well connector from the gas control.

Thermal well connector

Step 2. With a multi-meterset to the ohms setting, measure the resistance between the middle and right side wires.

Step 3. With a multi-meterset to the ohms setting, measure the resistance between the middle and left side wires.

Page 21

21

Determine Tank Temperature

Thermal Well Testing (cont’d)

Determine the correct resistance values using the Determine the Water Temperature Inside the Tank procedure on page 23. If the values are correct, replace the gas control, otherwise replace the thermal well.

Determine Water Temperature Inside Tank

WARNING

Stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury.

Note: It is important to understand once the resistance for the thermal well is determined using the Thermal Well Testing Procedure on page 21, water flow through the water heater should not occur. Prior to performing the steps below, turn off the cold water supply to the water heater. This will prevent cold water flow into the tank affecting the resistance value of thermal well.

Step 1. Move the gas control power switch to the “OFF”

position.

Gas control power switch

Step 2. Draw approximately 4 gallons of water from the drain valve into a container and discard. Draw an additional gallon and immediately measure the water temperature using an accurate thermometer. It may be necessary to open a hot water faucet to allow heater to drain.

Step 3. Using the chart on page 23, determine the correct resistance value for the water temperature from Step 2.

Example: If temperature of water is 84°F, then the resistance through the sensor would be 8449 (see shaded area). NOTE: Sensor resistance increases as the temperature falls.

Page 22

22

Component Disassembly

Sensor Resistance at Various Temperatures

In Degrees F

°F

0

1

2

3

4

5

6

7

8

9

40

26109

25400

24712

24045

23399

22771

22163

21573

21000

20445

50

19906

19383

18876

18383

17905

17440

16990

16553

16128

15715

60

15314

14925

14548

14180

13823

13477

13140

12812

12494

12185

70

11884

11592

11308

11032

10763

10502

10248

10000

9760

9526

80

9299

9078

8862

8653

8449

8250

8057

7869

7685

7507

90

7333

7165

7000

6839

6683

6531

6383

6238

6098

5961

100

5827

5697

5570

5446

5326

5208

5094

4982

4873

4767

110

4663

4562

4464

4368

4274

4183

4094

4006

3922

3839

120

3758

3679

3602

3527

3453

3382

3312

3244

3177

3112

130

3048

2986

2925

2866

2808

2752

2697

2643

2590

2538

140

2488

2439

2391

2344

2298

2253

2209

2166

2124

2083

150

2043

2004

1966

1928

1891

1856

1820

1786

1753

1720

160

1688

1656

1625

1595

1566

1537

1509

1481

1454

1427

170

1402

1376

1351

1327

1303

1280

1257

1235

1213

1191

180

1170

1150

1129

1110

1090

1071

1053

1035

1017

999

190

982

965

949

933

917

901

886

871

857

842

200

828

814

801

788

775

762

749

737

725

713

Gas Control & Thermal Well Removal From Water Heater

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.

Damper (water heater) power cord

Step 3. Drain the water heater to a point below the gas control level.

Step 4. Turn off the gas supply to the water heater and disconnect the gas piping from the gas control.

Page 23

23

Gas Control Removal

Gas Control & Thermal Well Removal From Water Heater (cont’d)

Step 4. Disconnect the pilot tube using a 7/16” wrench and the main burner feedline with a 3/4” wrench from the gas control.

Pilot and main feedlines

Step 5. Disconnect the wire harnesses and spark igniter/ flame sense wire from the gas control.

Gas control

Spark igniter/flame sensor wire

Step 6. Remove the gas control &

thermal well by rotating the flats of the Thermal Well counter clockwise using a 1-5/16”wrench.

Flats of thermal well

Gas Control Removal From Thermal Well

Following the steps below allows for the removal of the gas control from the thermal well without removing the thermal well from the tank.

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.

Damper (water heater) power cord

Page 24

24

Gas Control Assembly

Gas Control Removal From Thermal Well (cont’d)

Step 3. Turn off the gas supply to the water heater and disconnect the gas piping from the gas control.

Step 4. Disconnect the pilot tube using a 7/16” wrench and the main burner feedline with a 3/4” wrench from the gas control.

Pilot and main feedlines

Step 5. Disconnect the wire harnesses and spark igniter/

flame sense wire from the gas control.

Gas control

Spark igniter/flame sensor wire

Step 6. Using the gas control service tool, p/n 239-45991-00, available from your BWC parts supplier, insert the tool into the back of the gas control.

Gas control service tool

Step 7. Pivot the tool towards the water heater, as far as possible. Lift straight up on the gas control. The gas control should move about 1/8". Hold the gas control in position and remove the tool. Lift straight up on the gas control to remove it completely from the thermal well.

Gas Control Assembly to the Thermal Well

Step 1. Install the threaded end of the thermal well into the tank. Be sure the thermal well flange is positioned properly to allow for proper gas control installation. Tighten the thermal well using a 1-5/16”wrench.

Page 25

25

Gas Control Assembly

Gas Control Assembly to the Thermal Well (cont’d)

Step 2. Route the wire leads back into relief opening.

Wire leads on thermal well

Slots in thermal well

Relief opening

Step 3. Align the slots located on the thermal well flange with the tabs located on the back of the gas control.

Tabs on back of gas control

Step 4. Carefully push the gas control back onto the thermal well flange as far as possible towards the water heater. Then, slide the gas control down to lock into position.

Step 5. Install the burner assembly and connect the pilot and main feedlines to the gas control using a 7/16” and 3/4” wrench, respectively.

Pilot and main feedlines

Step 6. Reconnect the wire harnesses to the gas control.

Wire harnesses

Step 7. Reconnect the gas piping to the gas control. Restore the gas supply and check for gas leaks.

Page 26

26

Flammable Vapor Sensor Testing

Gas Control Assembly to the Thermal Well (cont’d)

Step 8. 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.

Flammable Vapor Sensor Testing

CAUTION

Do not use standard multi-meterprobes for this testing. Doing so will damage the connector. 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” position.

Gas control power switch

Step 2. Disconnect the flammable vapor sensor harness from the gas control.

Step 3. Using a multi-meterset to the ohms setting, measure the resistance of the flammable vapor sensor and resettable thermal switch. The resistance must be between 3,000 and 48,000 ohms. If the resistance is out of this range, verify that the resettable thermal switch has not been tripped. If it hasn’t, replace the thermal switch.

Flammable vapor sensor harness

120 VAC Circuit Trace

Step 1. Verify 120VAC and proper polarity are at the wall outlet.

Step 2. With the water heater plugged in and the gas control power switch in the “ON” position verify LED status.

Page 27

27

Dip Tube Inspection

Dip Tube Inspection and Replacement

WARNING

Water 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. 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. Open a nearby hot water faucet to vent the water heater for draining. Open the drain valve of water heater and allow the water heater to drain to a point below the inlet connection nipple.

Step 4. Disconnect the inlet nipple from the plumbing system.

Step 5. 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 6. Visually inspect the inlet nipple/diptube. The inlet nipple/diptube should be free of cracks and any blockage. Hydro-jetslots should be open and free of any blockage. Any damage, such as cracks, restriction due to deformation, or unintentional holes are not field repairable and the inlet nipple/diptube must be replaced.

Step 7. Upon completion of the inspection or subsequent replacement, reinstall the inlet nipple/diptube into the water heater. Connect the nipple to the plumbing system, resume water supply to the water heater, and refill the water heater.

Step 8. 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 28

28

Anode Inspection

Anode Inspection and Replacement

WARNING

Water 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. 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. Open a nearby hot water faucet to vent the water heater for draining. Open the drain valve of water heater and allow the water heater to drain to a point below the outlet connection nipple.

Step 4. Disconnect the outlet nipple from the plumbing system.

Step 5. With an appropriate tool, such as a pipe wrench, remove the outlet nipple/anode from the water heater. Use caution not to damage the pipe threads.

Step 6. Visually inspect the outlet nipple/anode. The outlet nipple/anode should show signs of depletion, which is normal. If depletion is one-halfthe original anode diameter (approximately 3/4” diameter), replacement is recommended. If any of the steel core of the anode is exposed, replacement is recommended.

Step 7. Upon completion of the inspection or subsequent replacement, reinstall the outlet nipple/anode into the water heater. Connect the nipple to the plumbing system, resume water supply to the water heater, and refill the water heater.

Step 8. 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 29

29

Damper Removal

Remove the Damper to Gain Access to the Flue Baffle

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.

Damper (water heater) power cord

Step 3. Disconnect the vent system from the draft hood that is mounted on top of the damper.

Vent system

Draft hood

Damper

Step 4. Unplug the cord sets from the damper.

Cord sets

Step 5. Remove the two damper mounting screws using a 1/4” nut driver and retain for later use.

1/4” nut driver

Page 30

30

Damper Removal

Remove the Damper to Gain Access to the Flue Baffle (cont’d)

Step 6. Remove the damper from the top of the water heater.

Damper

Top of water heater

Water heater tank flue

Step 7. Remove the flue baffle from the water heater.

Step 8. Inspect the baffle for deterioration and missing restrictors. Clean any scale or debris build-up.Replace with a new baffle, as necessary.

Step 9. Reinstall the baffle into the flue. Be sure the baffle hanger tab is inserted into the notch locations at the top of the flue.

Flue baffle

Step 10. Check the burner to ensure no scale has accumulated during operation. See the Burner Cleaning Procedure on page 15, if accumulation has occurred.

Step 11. Secure the damper in place using the screws from Step 5. Step 12. Reconnect the vent system to the draft hood.

Step 13. Reconnect the cord sets from Step 4. 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. Or, use the lighting instructions located in the water heater installation and operating manual.

Page 31

31

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.

Damper (water heater) power cord

Step 3. Remove the outer door.

Outer door

Step 4. Remove (4) 1/4” hex drive screws from the right side inner door.

(4) 1/4” hex drive screws

Step 5. Remove (2) 1/4” drive screws from the left side inner door.

Step 6. Remove the connectors attached to the thermal switch on the right side inner door.

Connectors attached to resettable thermal switch

Page 32

Right side inner door

32

Inner Door Gasket Replacement

Inner Door Removal Procedure (cont’d)

Step 7. Inspect both inner doors for any of the following imperfections: tears, missing material, cracks, dirt or debris, lack of adhesion to the inner door, material left on combustion chamber, or any other imperfections that will inhibit a proper seal.

If any of the imperfections above are present, replace the inner door gasket following the Inner Door Gasket Replacement Procedure. If not, replacement of the inner door gaskets is not necessary.

Inner Door Gasket Replacement Procedure

WARNING

If the information in these instructions is not followed exactly, a fire or explosion may result 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.

Gasket Overlap must be as shown + 1/32

Step 2. Using RTV sealant, apply a 1/8” bead to secure the inner door gasket to the inner door sections. Refer to the illustration for proper application. Note the overlap configuration in the flange area of the inner door. Set the flange section first, and this will help to achieve the proper overlap position.

Enlarged view of flange area

Recommended pattern for RTV sealant

Gasket Overlap must be as

Expanded view

shown + 1/32

 

Page 33

33

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

Step 1. Clean any residual gasket residue or other debris from the combustion chamber surface before installing the inner door/gasket assembly.

Step 2. Place the left side inner door into position first, being sure to firmly position the concave channel of the inner door around the feedline.

Step 3. Using the 1/4” hex drive screws removed in Step 5 of the Inner Door Removal Procedure on page 32, secure the left side inner door in place. Do not overtighten the screws.

Step 3. Position the pilot tube and spark igniter wire against the left side inner door flange gasket. Do not route these through the concave channel with the feedline.

Step 4. Firmly place the right side inner door flange against the left side inner door flange.

Step 5. Using the 1/4” hex drive screws removed in Step 4 of the Inner Door Removal Procedure on page 32, secure the two flanges together. Do not over-tightenthe screws.

Step 6. Align the right side inner door to the combustion chamber and verify the fastener holes of the combustion chamber are aligned with the right side inner door slotted openings. Verify seal integrity around the combustion chamber opening.

Step 7. Using the 1/4” hex drive screws removed in Step 3 of the Inner Door Removal Procedure on page 32, secure the right side inner door. Do not over-tightenthe screws. Verify that both the left and right side inner doors are properly positioned and sealed against the combustion chamber.

Step 8. Re-installthe outer door.

Step 9. 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 34

34

Arrestor Cleaning

ScreenLok® Flame Arrestor Cleaning Procedure

Step 1. Move the gas control power switch to the “OFF” position and unplug the water heater from the wall outlet.

Step 2. Remove the outer door.

Step 3. Remove the right side inner door per the Inner Door Removal Procedure on page 32.

Step 4. Disconnect the pilot tube using a 7/16” wrench and the main burner feedline with a 3/4” wrench from the gas control.

Step 5. Disconnect the spark igniter/flame sensor wire from gas control. Step 6. Remove the burner assembly from the combustion chamber.

Step 7. Clean the ScreenLok® flame arrestor using a stiff brush, compressed air, and/or a shop vacuum to remove any scale or other debris accumulation. Using a soft brush, clear jacket openings from any dirt, dust, restrictions, or other obstructions.

Step 8. Remove any debris from the burner assembly following the Burner Cleaning Procedure on page 15.

Step 9. Re-installthe burner assembly.

Step 10. Reconnect the main and pilot tubing and spark igniter wire to the gas control.

Step 11. Re-installthe inner door per the Inner Door Installation with Gasket Procedure on page 34.

Step 12. 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.

Damper Relay Installation

If the damper fails and water heater operation is necessary temporarily, a relay, p/n 233-47642-00,and harness, p/n239-48471-00,can be ordered from the Bradford White Service Parts Department.

Step 1. Move the gas control power switch to the “OFF” position.

Gas control power switch

Page 35

35

Damper Relay Installation

Damper Relay Installation (cont’d)

Step 2. Unplug the water heater from the wall outlet.

Damper (water heater) power cord

Step 3. Disconnect the vent system from the draft hood that is mounted on top of the damper.

Vent system

Draft hood

Damper

Step 4. Remove the draft hood from the damper and retain it for use on the new damper.

Step 5. Unplug the cord sets from the damper.

Cord sets

Step 6. Remove the two damper mounting screws using a 1/4” nut driver and retain for later use.

1/4” nut driver

Step 7. Move the damper blade to the vertical position.

Damper Blade

Step 8. Move the switch on the back to the damper to the “Service” position (towards the front of the water heater).

Service Switch

Page 36

36

Damper Relay Installation

Damper Relay Installation (cont’d)

Step 9. Turn the damper on its side and lay it on top of the water heater.

Step 10. Remove the Red wire in the damper housing from its location. Connect the 1/4” Red female connector on the relay harness in its place.

Step 11.

Remove the Yellow wire in the damper

 

from its location. Connect the 1/4” Yellow female connector

 

the relay harness in its place.

White Wire

 

 

 

 

 

 

 

Blue Wire

 

 

Yellow Wire

Red Wire

 

 

 

Step 12.

Remove the Blue wire in the damper housing from its location. Connect

the 1/4” Blue female connector on the relay harness in its place.

 

Step 13.

Remove the White wire in the damper housing from its location. Connect

the 1/4” White female connector on the relay harness in its place.

Step 14. Using the White wire that was removed in Step 13, connect it to the piggyback spade connector that was installed in Step 13.

Blue Wire

White Wire

Step 15. Connect the other ends of the relay harness, shown.

Yellow Wire

 

Leave this Terminal

 

Open

Red Wire

 

Relay

 

Step 16. Place the relay and its harness fully inside the damper housing.

Relay and harness

Damper Housing

Page 37

37

Common Terms

Common Terms

BTU

British Thermal Units

ECO

Energy Cut Off

GPM

Gallons per Minute

Hz

Hertz

KWh

Kilowatts per hour

LED

Light Emitting Diode

NPT

National Pipe Thread

Ohms

Ohms of resistance

PSI

Pounds per Square Inch

RPM

Revolutions per Minute

VAC

Volts Alternating Current

W.C.

Inches of Water Column

°C

Degrees Centigrade

°F

Degrees Fahrenheit

NOTES

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

Page 38

38

 

 

 

 

 

 

Parts List

 

1

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

3

 

 

 

 

 

7

 

 

 

 

 

 

6

 

 

 

 

 

 

 

8

 

 

 

 

 

 

 

9

 

4

 

 

 

 

 

10

 

 

 

 

 

 

 

11

 

17

 

 

 

 

 

 

 

18

 

 

 

 

 

 

 

19

 

 

 

 

14

12

20

 

 

 

 

 

 

 

 

 

 

 

 

 

21

16

 

15

 

 

 

 

 

 

 

 

 

23

22

24

 

 

 

13

 

 

25

 

 

 

 

 

27

26

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15A

 

PART NAME AND DESCRIPTION

 

1.

Draft Hood

 

 

 

15.

Inner Door (Right)

 

2.

Damper

 

 

 

15A. Resettable Thermal Switch

 

3.

Jacket Head Pan

 

 

 

16.

Inner Door (Left)

 

4.

Jacket

 

 

 

17.

Damper Wire Harness

 

5.

Heat Trap—ColdWater Inlet

 

18.

Thermal Well

 

6.

Magnesium Anode–HotWater Outlet

 

19.

Gas Control Valve

 

7.

Heat Trap—ColdWater

 

 

20.

Wire Harness (FVS / RTS)

 

8.

Flue Baffle Assembly

 

 

 

21.

FVS Sensor Clip

 

9.

Dip Tube–ColdWater Inlet

 

 

22.

Flammable Vapor Sensor (FVS)

 

10. Temperature and Pressure Relief Valve

 

23.

Outer Door

 

11. Glass Lined Tank

 

 

 

24.

Steel Burner

 

12. Combustion Chamber Assembly

 

25.

Orifice

 

13. Jacket Base Pan

 

 

 

26.

Pilot Assembly

 

14. Drain Valve

 

 

 

27.

Feedline

 

Page 39

39

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