Bradford White HE440S*F, HE440S*FBN, HE440S*FSX, HE450S*FBN, HE450S*FSX Service Manual

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Manual 238-50216-00A

SERVICE

MANUAL

Troubleshooting Guide

and Instructions for Service

(To be performed ONLY by

qualified service providers)

Models Covered

by This Manual:

HE440S*F(BN,SX)
HE450S*F(BN,SX)
(*) Denotes Warranty Years

Super High Efficiency

Atmospheric Vent Gas Water Heaters

Table of Contents

2

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
Blower Replacement ______________________________________ 19
Temperature Sensor Testing ________________________________ 21
Determine Water Temperature Inside Tank ____________________ 23
Gas Control Removal ______________________________________ 25
Gas Control Disassembly/Assembly __________________________ 26
Flammable Vapor Sensor Testing ____________________________ 27
120 VAC Circuit Trace _____________________________________ 28
Diptube Inspection _______________________________________ 28
Anode Inspection _________________________________________ 29
Blower Removal __________________________________________ 30
Inner Door Removal ______________________________________ 32
Inner Door Gasket Replacement _____________________________ 33
Inner Door Installation ____________________________________ 34
Pressure Switch Testing & Replacement _______________________ 35
Arrestor Cleaning _________________________________________ 37
Common Terms __________________________________________ 38
Notes __________________________________________________ 38
Parts List _______________________________________________ 39

Page 2

WARNING

3

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:

x Do not
x Do not touch any electrical switch; do not use any phone in your building
x Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s

instructions.
x If y
Installation and service must be performed by a qualified installer, service agency, or the
gas supplier.

try to light any appliance

ou cannot reach your gas supplier, call the fire department.

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 n
heater. Sweat the tubing to the adapter before fitting the adapter to the water
connections. It is imperative that heat is not applied
liner.

Turn off or disconnect the electrical power supply to the water heater before servicing.

Label all wires prior to disconnection when
improper and dangerous operation. Verify proper operation after servicing.

servicing controls. Wiring errors can cause

to the nipples containing a plastic

ipples on top of the water

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 conta
manufacturer listed on the rating plate for replacement parts.

ct the supplier where the water heater was purchased or the

Page 3

WARNING

4

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
unn

ecessary 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 opera
from the tank for a long period of time (generally two weeks or more). Hydrogen gas is
extremely flammable. To prevent the
recommend a hot water faucet to be open for several minutes at the kitchen sink before
you use any electrical appliance which i
present, there will be an unusual sound such as air escaping through the pipes as hot
water begins to flow. Do not smoke
open.

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

FOLLOWING:

Liquefied petroleum gas

supplier that aids in the detection of the gas. Most people recognize this odor as a “sulfur”
or “rotten egg” smell. Other conditi
diminish in intensity, or ”fade,” and not be as readily detectable. If you have a diminished
sense of smell, or are in
gas supplier from a neighbor's telephone. Gas detectors are available. Contact your gas
supplier, or plumbing professional for more information.

F

AILURE 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 TEMPE

es/propane gas and natural gas have an odorant added by the gas

ons, such as “odorant fade” can cause the odorant to

any way unsure of the presence of gas, immediately contact your

ting water heater that has not had water drawn

possibility of injury under these conditions, we

s connected to the hot water system. If hydrogen is

or have open flame near the faucet at the time it is

RATURE AND PRESSURES.

Page 4

Introduction

5

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 Super High Efficiency 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.

Spark-to-Pilot Ignition System - employing the spark-to-pilot ignition 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.

Please read the service manual completely before attempting service on this new series of super
high efficiency gas 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 bottom. 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
combustion chamber, the vapors are harmlessly ignited by the burner. If flammable vapors are

Page 5

How to Use this Manual

6

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 Super High Efficiency atmospheric gas
water heaters. Understanding the sequence of operation section of this manual will contribute
greatly to troubleshooting the water heater.

The Honeywell WV4462 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-amps and ohms.

Electronic Probes: In some cases, standard multi-meter probes will damage or simply not be
effective to obtain certain voltage and ohm reading. It will be necessary to have special
electronic “pin” type multi-meter probes. 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.

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), torx bits, 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

Specifications

7

Power Supply

Gas Supply Pipe

Approved Gas Type

Gas Pressure

Approved Vent Materials

Recommended Minimum

Clearance for Servicing

Water Supply Pressure

ECO Limit

Pressure Switch Setting

(normal altitude)

Temperature Setpoint Range

Dedicated 120VAC, 60 Hz, 15A

Minimum 1/2” (Schedule 40 black iron pipe

recommended)

Natural or Propane; unit must match gas type supplied

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

Single or Double Wall Metal Vent Pipe

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

150 psi maximum allowable working pressure; check local
codes for supply pressure

188°F (87°C)

-0.20” w.c.

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

Page 7

Specifications

8

Control Timings

Ignition State Timing

Pre-purge 15 seconds

Trial for Ignition 90 seconds

Flame Stabilization Period 3 seconds

Interpurge 15 seconds

Flame Failure Response Time

Postpurge 15 seconds

Pressure Switch Fault Delay (failed open/close) Retry after 2 minutes

Soft Lockout Retry after 5 minutes

ECO Limit Lockout Inde

Verify Resistive Delay Retry after 2 minutes (repeats 5 times)

Simulated Resistive Load Lockout Indefinite (cycle powe

Hardware Error Lockout

1.5 seconds (2 second m

finite (See page 21 to reset)

Indefinite (self clears if fault clears for at least 15

aximum; 1 second mini-

mum)

r to reset)

seconds)

Wiring Diagram

Page 8

Sequence of Operation

9

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

1. Thermostat Calls for Heat: Prior to energizing the blower, the gas control verifies

the safety circuit to see if it is in the correct state. Normal switch positions in the
safety circuit are as follows:

A) Pressure switch normally open;

B) Blower temperature switch normally closed.

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 blower is energized for 30
seconds. This cycle repeats until the safety circuit opens.

2. Blower Energizes

3. Safety Circuit Check: If the safety circuit does not close within 30 seconds, the

gas control LED flashes 3 times with a 3 second pause. The blower runs for a
maximum of 30 seconds every 2 minutes trying to close the safety circuit. This
cycle repeats as long as there is a call for heat.

4. Blower Pre-Purge (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 blower will postpurge,
and the gas control LED flashes 6 times then 1 time 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

Sequence of Operation

10

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).

Pressure Switch / Blower Temperature Switch: If either switch opens, the pilot and
main valves are shutdown. The blower continues to run for 30 seconds attempting
to close the 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 blower
runs for 15 seconds. The gas control attempts to re-light the pilot 4 times. If
unsuccessful, the blower is shutdown, and the gas control proceeds to a 5 minute
lockout. The gas control re-attempts to light the pilot starting at Normal Heating
Sequence #2.

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

9. Burner Off

10.Blower Postpurge (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 with a 3 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 240 ohms: The gas control immediately turns off all
outputs and proceeds to flash 8 times then 1 time with a 3 second pause. The error
self clears if the resistance returns to normal range for at least 15 seconds.

Page 10

Sequence of Operation

11

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
error 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. 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. Pressure Switch / Blower Temperature Switch (Safety Circuit) Fault:

A) Pressure Switch Closed at Start of Call for Heat: The gas control proceeds to

flash 2 times with a 3 second pause. The gas control waits 2 minutes, and then
turns the blower on for 60 seconds. The blower turns off after 60 seconds, and
the control waits for the pressure switch to open.

B) Pressure Switch Failed to Close: The gas control runs the blower for 60

seconds waiting for the pressure switch to close. If the switch does not close in
60 seconds, the blower turns off, and the control flashes 3 times with a 3 second
pause. The gas control waits two minutes before turning on the blower for
another 60 seconds to see the circuit close. This cycle repeats as long as there
is a call for heat or until the circuit closes.

C) Pressure Switch / Blower Temperature Switch Opens During Burner Operation:

The gas control turns off the pilot and main valve and runs the blower for 15
seconds (inter-purge) waiting for the pressure switch and/or blower temperature
switch to close. If either switch fails to close, the control proceeds as described
in 3B above. If the circuit closes again by the end of the inter-purge, the recycle
counter is incremented. 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 turns off the blower and flashes 6 times then 2 times with a 3 second
pause. The gas control waits 5 minutes before repeating the ignition sequence.

Page 11

Sequence of Operation

12

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.

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, and the gas control runs the
blower through postpurge. The gas control LED flashes 6 times then 1 time with
3 second pause. The control waits 5 minutes before repeating the ignition
sequence.

5. Flame Sensing Fault:

A) Flame Lost During Run: The gas control turns off pilot and main valves and runs
the blower for 15 seconds (inter-purge). 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 blower is running. If flame is present when the pilot valve is not open, the gas
control continues 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

pply

(

)

)

p

(

)

g

yp

p

g

Troubleshooting

13

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 th
as recommended in the table below.

LED Status Control Status Probable Cause Service Procedure

None (LED not
on or flashing)

One short flash

eve ry four

se co nds

One short flash

eve ry tw o

se co nds

Alternates

bright and dim

heartbeat

Short fla sh once

eve ry second

Two flashes,

three second

pause

Three fla shes,

three second

pause

Four flashes,

three second

pause

Five flashes ,

three second

aus e

Six fla shes, one

flash, three
se co nd pause
(Soft Lockout)

Ele ctrical power not

present

Stand-by mo de,

The rmos tat is

sa tisfied

Stand-by mo de,

Sabbath mo d e (n o

The rmostat calling

for heat (no fault)

Weak pilot signal

on last call fo r heat

Pressure switch not

working - close

Pre ssure switch or

temperatu re switch

not w orking - open

Excessive tank

temperature,

system mus t be

Fals e pilot flame

Failed to light pilot,

system resets aft

no faults

faults

position

position

res et

present

(5) minutes

Contro l power switch in "OFF"
position.
Su

Temp erature demand is satisfied
(no call for heat)

Temp erature on Setb a ck Control is
adjusted down to preve nt burner
o

Tank temp e rature below setpoint of
thermostat

1.

2. Pilot tube blocked or re stricted

3. Oxidation build-up on pilot
electrode

4. Wire d a mage to pilot asse mb ly or
bad co nnection at

1. Pressure switch tubing kinke d or
blocked

d

2. Blocked pressure tap on switch
or blower

3. Fault

1. V
config uration

2. Pressure switch tubing kinke d or
blocked

3. Faulty pre ssure switch

4. Blower not spinning up to speed

5. Damp e r (insi
opening

6. Faulty blower temp erature switch

1. Temperature senso r out of
calibration

2. Faulty gas co ntrol

Pilot valve stuck in open position Re place gas contro l

1. Unstable pilot

2. Pilot tube block or restricte d

3. Oxidation build-up on pilot

er

electrode

4. Wire d a mage to pilot asse mb ly or
bad co nnection at

voltage interrupted.

era tion

Unsta ble pilot

as contro l

ressure s witch

ent blockage or impro p e r vent

de blower) not fully

as valve

e water heater,

Turn Power On

Normal ope ration

Normal ope ration

Normal ope ration

1. See Burner Inspe ction on page
15
2-4. See Pilot Inspe ction, Testing
and Repla cement on page 17

See Pressure Switch Te sting and
Replacement on page 35

1. Verify cord sets a re fully plugged
in

2. See Pressure Switch Testing and
Replacement

1. Test Gas
Sens or

2. Repla ce gas control if necessary

1. See Burner Inspe ction on page
15
2-4. See Pilot Inspe ction, Testing

and Repla cement on page 17

on page 35

Control & Temp e rature

Page 13

gasp

p

g

p

p

p

Troubleshooting

14

LED Status Control Status Probable Cause Service Procedure

1. Vent blockage or impr o per vent
config uration

2. P ressure switch tubing kinked or
blocked

3. Fa ulty pressure switch

4. Blower not spinning up to spee

ets

5. Damper (ins ide blower) not fully
opening

6. Fa ulty blower temp eratu re switch

1. Uns ta ble pilot

2. P ilot tube block or

3. Oxidation build-up on pilot

electrode

4. Wire damage to pilot assemb ly or

bad co nne ction at gas control

5. Insufficie nt co mbus tion air

6. Insufficie nt

Pilot valve stuck in open position Re place gas contro l

1. Fla mmable va por pre sent

2. Fla mmable va por sensor expo s e d
to excessive mo isture

3. Fla mmable va por sensor expo s e d
to extre me ambie nt temp e rature

4. Rese ttab le thermal sw itch open

1. Fla mmable va por sensor out of
speci

fication; verify Flammable Vapor
Senso r (FVS) re sistance is not below
25,000 Ohms.

2. Possible short in flammable va por
se ns or or re settable thermal sw itch
wirin

1. Damage to temperature sensor
wires
2

. Temperature sensor res istance

out of range

3. Re

lace t e mperature s enso r

1. Verify control is not wet or
phys

ically damaged

2. Rese t co ntro l on/off switch

3. Repla ce gas co ntrol if 8-3 e rro r

ers ists

1. Verify control is not wet or
physically damaged

2. R

es et contro l on/off switch

3. Repla ce gas co ntrol if 8-4 error

ers ists

restricted

ressure

1. See Burne r Ins pe ction on
page 15
2-4. See Pressure Switch Testing

d

and Repla ce m

1. See Burne r Ins pe ction on
page 15
2-4. See Pilot Ins pe ction, Testing
and Repla ce ment on page 17

5. Refer to Ins tallation &
Operation Manual

See Flammable Vapo r Senso r
Testing on page 27

See Flammable Vapo r Senso r
Testing on page 27

See Temp erature Sensor Te sting
on page 21

See Gas Control Remo val on
page 25

1. Repla ce gas contro l if wet or
physically damaged

2. Cycle po w e r

3. Repla ce gas contro l

ent on page 35

Six fla she s, two

flashes, three
se co nd pause
(So ft Lockout)

Six fla she s, three

flashes, three
se co nd pause
(So ft Lockout)

Six fla shes, four

fla

shes, three

se co nd

Seven flashes,

three second

Eight fla shes,

one flash, three

se co nd pause

Eight fla shes,

tw o flashes,

three second

Eight fla shes,
three flashes,

three second

Eight fla shes,

four flashes,

three second

aus e

pause

pause

pause

pause

Pressure switch or

blowe r temp switch

opened during

burner operation,

system auto res

after (5) minute s

Pilot fla me

extinguished,

system auto resets

after (5) minute s

Unde sired false

pilot flame s ense d,

system auto resets

Flammable vapor

se nso r or

resettable the rmal

switch fault

detected, see

warning label

Flammable vapor

se ns or out of

specification,

possible short

Temp erature

se ns or fault

dete cted

Gas control

electronics fault

dete cted

Gas contro l fault

dete cted

Page 14

Burner Maintenance

15

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 below).

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.

Blower (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

Burner Maintenance

16

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.

Step 7. Disconnect the spark igniter/flame sensor wire
from gas control.

Pilot and main feed-

lines

Gas control

Right side

inner door

Spark igniter/flame

sensor wire

Step 8. Remove the burner assembly from the combustion
chamber.

Burner assembly

Burner surface area

and burner ports

Step 9. Thoroughly inspect the burner surface area and
burner port area and remove any loose debris.

Step 10. Unscrew the burner from the main burner orifice.

Main feedline

Main burner

orifice

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.

Page 16

1/2” wrench

Pilot Maintenance

17

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.

Blower (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

Right side

inner door

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 feed-

lines

Page 17

Pilot Maintenance

18

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-meter set to the ohms setting, check
continuity through the spark igniter/flame sense wire. Replace
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

Blower Replacement

19

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.

Blower 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.

Blower (water heater)

power cord

Page 19

Blower Replacement

20

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. Unplug the cord sets from the blower.

Cord sets

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

1/4” nut driver

Blower

Step 7. Remove the blower from the top of the water
heater.

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 blower in place using the water heater tank flue and the
screw holes in the jacket head.

Step 10 Secure the blower in place using the screws from Step 6.

Step 11. Re-install the draft hood from Step 4.

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

Page 20

Temperature Sensor Testing

21

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. Or, use the lighting instructions located in the water heater
installation and operating manual.

Temperature Sensor Testing

CAUTION

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

ed into

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. 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

Page 21

Temperature Sensor Testing

22

Temperature Sensor Testing (cont’d)

Step 3. Disconnect the spark igniter from the gas control.

Gas control

Spark igniter/flame

sensor wire

Step 4. Disconnect the gas control power harness from the
bottom of the control.

Gas control power harness

Step 5. Disconnect the flammable vapor sensor /
resettable thermal switch (FVS/RTS) harness from the bottom of
the control.

FVS/RTS harness

Step 6. Using a slotted screwdriver, remove the screw
(holding the cover on) at the bottom of the gas control.

Slotted screwdriver

Step 7. Depress both tabs on the top of the gas control
cover and pull to remove.

Step 8. Disconnect the temperature sensor wire harness
from the gas control board.

Temperature sensor wire

harness

Page 22

Determine Tank Temperature

23

Temperature Sensor Testing (cont’d)

CAUTION

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

Step 9. With a multi-meter set to the ohms setting,
measure the resistance between the middle and right side
wires.

Multi-meter leads

Step 10. With a multi-meter set to the ohms setting,
measure the resistance between the middle and left side wires.

ed into

Multi-meter leads

Determine the correct resistance values using the Determine the Water Temperature
Inside the Tank procedure below. If the values are correct, replace the gas control,
otherwise replace the temperature sensor.

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 temperature sensor is
determined using the Temperature Sensor 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 temperature sensor.

Page 23

Determine Tank Temperature

24

Determine Water Temperature Inside Tank (cont’d)

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 below, 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.

Sensor Resistance at Various Temperatures

In Degrees F

°F 0 123456789

40 2610925400 24712 24045 23399 22771 221632157321000 20445

50 19906 19383 18876 18383 17905 17440 16990 1655316128 15715
60 15314 14925 14548 14180 13823 13477 13140 12812 12494 12185
70 11884 11592 1130811032 107631050210248 10000 9760 9526

80 9299 907888628

907333 7165 7000 6839 6683 6531 6383 6238 6098 5961
100 582756975570544653265208 5094 4982 48734767
110 4663456244644368427441834094 4006 3922 3839
120 3758367936023527 3453 3382 3312 3244 3177 3112
130 3048 2986 2925 2866 28082752269
140 2488 2439 2391 2344 2298 225322092166 2124 2083
150 2043 20041966 1928 1891 1856 1820 1786 17531720
160 1688 1656 1625 1595 1566 1537 150914811454 1427
170 14021376 1351 1327 13031280 1257 1235 1213 1191
180 1170 1150 1129 1110 1090 1
190 982 965 949 933 917 901886 871857 842
200 828 814 801 788 775 762 749 737725713

653 8449 8250 8057 7869 7685 7507

7 2643 2590 2538

07110531035 1017 999

Page 24

Gas Control Removal

25

Gas Control Removal

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

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

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

Gas control power

switch

Blower (water heater)

power cord

Step 4. 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 feed-

lines

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

Gas control

Spark igniter/flame

sensor wire

Wire harnesses

Step 6. Spin the gas control out of the water heater tank.

Page 25

Gas Control Assembly

26

Gas Control Disassembly / Assembly

Following the steps below allows for the removal of the gas control from the
temperature sensor well without removing the temperature sensor 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.

Blower (water heater)

power cord

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 feed-

lines

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

Gas control

Spark igniter/flame

sensor wire

Wire harnesses

Page 26

Flammable Vapor Sensor Testing

27

Gas Control Disassembly / Assembly (cont’d)

Step 6. Using a slotted screwdriver (or a T-15 torx),
remove the screw (holding the cover on) at the bottom of the gas
control.

Slotted screwdriver

Step 7. Depress both tabs on the top of the gas control cover and pull to remove.

Step 8. Disconnect the temperature sensor wire harness
from the gas control board.

Temperature sensor wire

harness

Flammable Vapor Sensor Testing

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

Gas control power

switch

Step 2. Disconnect the flammable vapor sensor /
resettable thermal switch (FVS/RTS) harness from the gas
control.

FVS/RTS harness

Page 27

120 VAC Circuit Trace

28

Flammable Vapor Sensor Testing (cont’d)

Step 3. Using a multi-meter set to the ohms setting, measure the resistance of
the flammable vapor sensor.

Step 4. Using a multi-meter set to the ohms setting, measure the resistance of
the resettable thermal switch (between the left two pins of the wire harness). The
resistance must be between 3,000 and 48,000 ohms for both the switch and sensor. 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.

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.

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-jet slots 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.

Page 28

Anode Inspection

29

Dip Tube Inspection and Replacement (cont’d)

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, refill the water heater and check for
leaks.

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.

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-half the 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, refill the water heater, and check for
leaks.

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

Blower Removal

30

Remove the Blower 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.

Blower (water heater)

power cord

Vent system

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

Draft hood

Blower

Step 4. Unplug the cord sets from the blower.

Cord sets

Step 5. Remove the (3) blower mounting screws using a
1/4” nut driver and retain for later use.

1/4” nut driver

Page 30

Blower Removal

31

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

Blower

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

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

Top of water

heater

Water heater tank flue

Flue baffle

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.

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 blower 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

Inner Door Removal

32

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.

Outer door

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

(4) 1/4” hex drive

screws

Left side inner door

Step 5. Remove (2) 1/4” drive screws from the 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.

Right side

inner door

Page 32

Connectors attached to reset-

table thermal switch

Inner Door Gasket Replacement

33

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.

Step 2. Using RTV sealant, apply a 1/8” bead to secure
the inner door gasket to the inner door sections. Refer to the

Gasket Overlap must be as

shown + 1/32

Enlarged

view of

flange area

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.

Recommended pattern for RTV sealant

Gasket Overlap must be as

shown + 1/32

Expanded view

Page 33

Inner Door Installation

34

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.

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-tighten
the 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 4 of the Inner Door
Removal Procedure on page 32, secure the right side inner door. Do not over-tighten
the screws. Verify that both the left and right side inner doors are properly positioned
and sealed against the combustion chamber.

Step 8. Re-install the 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

Pressure Switch Testing

35

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.

Cord sets

Slotted screwdriver

Step 4. Using a slotted screwdriver, remove the (3)
screws (one on the backside of the junction box is not shown)
holding the end of the blower junction box on. Retain the
screws for later use.

Blower junction box

Junction box screws

Step 5. Remove the pressure switch tubing from the
pressure switch.

Pressure switch tubing

Step 6. Carefully pull out and lower the blower junction
box cover.

Junction box cover

Page 35

Pressure Switch Testing

36

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. Using a multi-meter, check the resistance across
the pressure switch terminals. There should be no electrical
continuity, meaning the switch is open.

Multi-meter leads

Step 10. If the switch is open, check the pressure switch
tubing and pressure tap on the switch for a blockage. Clear the blockage if one is
present.

Step 11. If there is not a blockage, replace the pressure switch. Verify the switch
setting of the replacement switch matches the original switch’s setting.

Step 12. Remove both terminals from the pressure switch..

Step 13. Connect both terminals to the new pressure switch.

Step 14. Place the pressure switch into the blower junction box.

Step 15. Align the pressure switch and install the (2) screws removed in Step 7.

Step 16. Re-install the blower junction box cover.

Step 17. Re-install the (3) screws removed in Step 4.

Step 18. Re-install the pressure switch tubing.

Step 19. Reconnect the cord sets from Step 3.

Step 20. Plug the water heater into the wall outlet.

Page 36

Arrestor Cleaning

37

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. 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-install the burner assembly.

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

Step 11. Re-install the 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.

Page 37

Common Terms

38

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

___________________________________________________________

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Page 38

Parts List

39

PART NAME AND DESCRIPTION

1. DraŌ Hood 15. Inner Door (Right)

2. Jacket Head Pan 15A. ReseƩable Thermal Switch

3. Jacket 16. Inner Door (LeŌ)

4. Blower 17. Blower Wire Harness

5. Heat Trap—Outlet 18. Feedline

6. Magnesium Anode–Hot Water Outlet 19. Gas Control Valve

7. Heat Trap—Inlet 20. Wire Harness (FVS / RTS)

8. Flue Baŋe Assembly 21. FVS Sensor Clip

9. Dip Tube–Cold Water Inlet 22. Flammable Vapor Sensor (FVS)

10. Temperature and Pressure Relief Valve 23. Outer Door

11. Glass Lined Tank 24. Steel Burner

12. CombusƟon Chamber Assembly 25. OriĮce

13. Jacket Base Pan 26. Pilot Assembly

14. Drain Valve

Page 39