Bradford White U-100T-88R-3N User Manual
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Manual 238-50628-00A
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
U175S*RN
U2XR75S*RN
U100T*RN
U75T80R*N
U100T88R*N
(*) Denotes Warranty Years
Ultra Low NOx Gas Water Heaters
Atmospheric ECO-MAGNUM SERIES
™
The Bradford White
2
Atmospheric ECO-MAGNUM
Ultra Low NOx Gas Water
Heaters
Table of Contents
Burner and Inner Door Gasket Removal, Inspection, Replacement
Page Service Procedure
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Page 2
ECO-MAGNUM
3
75/100-Gallon Atmospheric
WARNING
If the information in these instructions is not
followed exactly, a fire or explosion may result
causing property damage, personal injury, or
death.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable,
combustible, or corrosive vapors and liquids in
the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
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 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.
WARNING
Water heaters are heat producing appliances. To
avoid damage or injury, do not store materials
against the water heater or vent-air intake system.
Use proper care to avoid unnecessary contact
(especially by children) with the water heater and
vent-air intake components. UNDER NO
CIRCUMSTANCES MUST FLAMMABLE MATERIALS,
SUCH AS GASOLINE OR PAINT THINNER BE USED OR
STORED IN THE VICINITY OF THIS WATER HEATER,
VENT-AIR INTAKE SYSTEM OR IN ANY LOCATION
FROM WHICH FUMES COULD REACH THE WATER
HEATER OR VENT-AIR INTAKE SYSTEM.
CAUTION
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.
WARNING
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 the 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.
Incorrect operation of this appliance
CAUTION
may create a hazard to life and
property and will nullify the warranty.
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.
IMPORTANT
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
manufacturer listed on the rating plate
for replacement parts.
WARNING
DO NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU
ARE NOT CERTAIN OF THE FOLLOWING:
x Liquefied petroleum gases/propane gas and natural
gas have an odorant added by the gas supplier that
aids in the detection of the gas.
x Most people recognize this odor as a “sulfur” or
“rotten egg” smell.
x Other conditions, such as “odorant fade” can cause
the odorant to diminish in intensity, or ”fade”, and
not be as readily detectable.
x 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.
WARNING
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 3
How to Use This Manual
4
ECO-MAGNUM
75/100-Gallon Atmospheric
Introduction
It is intendedfor this manualto be usedbyqualified service personnelfor the primarypurpose of
troubleshootingand repair ofthe BradfordWhite Atmospheric Ultra Low NOx Series ofwater
heaters.
The Honeywell Gas C
codes are listed inthe troubleshootingchartbeginningonpage 5 ofthis service manual. The
troubleshootingchartwill also indicate the p
professionalto a service procedure to properly diagnose theabnormal operation.
Contactthe BradfordWhite technical support group immediately ifdiagnosis cannotbe mad
using the methods described inthis service manual.
ontrolwill display error codes intheevent of abnormal operation. Error
robablecause for the error codeand directthe service
e
Tools Requiredfor Service
Manometer: A liquid “U” tube type or a digital type can be used.This device is used
to measure gas and/or air pressure and vacuum.
Multi-Meter:Adigital typeisstrongly recommended. This device is usedto measure
electricalvalues.The meter you selectmusthave thecapa
measure volts AC, volts DC, Amps,micro-ampsand ohms.
Electronic Probes:Insome cases, standard multi-meter probes will damage or simply
notbeeffective toobtain certainvoltage and ohm reading.Itwill b
necessary to have special electronic “pin” type multi-meter probes.
These probes are availableatmost electronic wholesaleoutlets.
bility to
e
Thermometer:Usedto measure water temperature.Anaccurate thermometer is
recommended.
Water Pressure Gage:U
Various Hand Tools:Pipe wrench, channellocks, open end wrenchs
Page 4
sedto measure water supply pressure.Also usedto determine tank
pressure by adapting to the drainvalveofthe heater.
(3/8",7/16",½"),
12" crescent wrench, Allenwrench set, screwdrivers (common&
Phillips), ¼" nut driver,pliers (common&needle nose), socket set, side
cutters,wire cutters,wire strippers,wire crimpers,torpedo level, small
shopvac, ste
pladder,flashlight and 5 gallonpail.
pag
(
p
g
p
ECO-MAGNUM
5
75/100-Gallon Atmospheric
Gas Control Troubleshooting
Observe green LED indicator on
gas control. Errorflashcodes are
displayedwith athree second
pause before repeating. Check
andrepair thesystem as noted in
thetroubleshooting table below.
LED Status Control Status Probable Cause Service Procedure
If the pilot will not stay lit
None (LED not on
or flashing)
One flash and
three second
pause.
LED strobe (two
quick flashes) and
three second
ause.
LED on
co nti nuously.
Two flashes and
three second
pause.
Gas valve is not
powered.
1. If set point knob is in
"PILOT" position then
pilot flame is detected.
Turn set point knob to
desired setting
2. If set point knob is at
desired
valve is waiting for a
call for heat
Thermostat calling for
been recently turned to
Wait unti l LED goes out
before attempting to
detected. Syst
reset wh en pilot flame
settin g the gas
no faults).
heat (no faults).
Set point knob has
the "OFF" position.
ht
reli
Weak pilot flame
em will
is sufficient.
1. Pilot flame is not
present. Light pilot.
1. Gas valve is
powered and waiting
for the set point knob to
be turn ed to a water
temperature setting.
2. Temperature
demand is satisfied.
Tank temperature
below setpoint of
thermostat.
Set point knob was
turned to "OFF"
position.
1. Thermopile failure
2. Unstable pilot.
3. Pilot tube block or
restricted.
4. Resettable thermal
switch has o
ened.
replace thermopile, see
page 11. If problem
pe
rsists replace gas
valve, see
Normal operation.
thermostat to desired
temperature level.
Normal operation.
LED will go out and the
control will function
normally wh en the pilot is
lit.
1. See page 10.
2&3. See page 12.
4. See page 18.
GreenLED
Indicator
e 15.
Adjust
Page 5
p
y g
g
pag
Gas ControlTroubleshooting
6
LED Status Control Status Probable Cause Service Procedure
ECO-MAGNUM
75/100-Gallon Atmospheric
Three flashes
and th ree
second
pause.
Four flashes
and th ree
second
ause.
Five flashes
and th ree
second
pause.
Seven flashes
and th ree
second
pause.
Eight flashes
and th ree
second pause
Insufficient water
heating. System will
reset.
Excessive tank
temperature. System
must be reset.
Thermostat well fault.
Gas valve electronic
fault detected.
False pilot flame
present.
1. Thermowell
sensor and chamber
temperature sensor
out of calibration.
2. Possible short.
1. Thermowell
sensor out of
calibration.
2. Fault
1. Damage to the
thermowell wire.
2. Thermowell
sensor resist
out of ran
1. Control needs to
be reset
2. Control is wet or
physic
Pilot valve stuck in
open position.
as valve.
ance
e.
ally damaged
1&2. Rep
control, see page 15.
1. See page 14.
2. Replace gas control,
see page 15.
1&2. Replace gas
control, see page 15.
1.Turn gas control knob
to "OFF" position and
then follow lighting
instructions.
2. Replace gas control,
see
Replace gas control, see
page 15.
lace gas
e 15.
Page 6
ECO-MAGNUM
7
75/100-Gallon Atmospheric
SERVICE PROCEDURE I
Burner and Inner Door/Gasket Removal,
Inspection, Replacement and
Reinstallation
Inner Door Removal Procedure
Step 1. Rotate the gas control knob to the “OFF”
position.
Step 2. Remove outer jacket burner access door.
Step 3. Remove wire clip from main burner feedline.
Step 4. Inner Door Removal.
a) Disconnect red thermopile lead and red gas control lead from
resettable thermal switch. Disconnect white thermopile lead
from the gas valve (see photos 1 and 2).
b) Disconnect main burner feed line (¾” wrench), pilot tube
(7/16" wrench) and igniter wire from gas control (see photo 2).
c) Remove (2) ¼” hex drive screws from right side inner door
(see photo 3).
d) Remove (2) ¼” hex drive screws from flange section of
inner door (see photo 3).
e) Remove (3) 1/4" hex drive screws from burner door
(see photos 4&5). The burner door and burner are
one-piece.
3
Gas Control KnobShownIn
“OFF” Position
Pilot Tube
1
Red Thermopile Lead
Red Gas
Control Lead
White Thermopile
Lead
2
Main Burner
Feedline
Flange Hex
Drive
Screws
Position #2
Position #3
Right Side
Hex Drive
Screws
Burner Door
Hex Drive
Screws
4
Igniter Wire
5
f) Remove burner and inner door and inspect per step 5.
Step 5. Fully inspect burner door and right side inner door gaskets for the following:
>Tears >Other imperfections that will inhibit proper seal
>Missing Material >Gasket adhesion to inner door
>Cracks >Material left on combustion chamber (around opening)
>Dirt or debris
If the gasket is not effected by any of the above, gasket replacement is not required. If replacement is
required, proceed to Inner Door Gasket Replacement Procedure.
Position #1
Page 7
SERVICE PROCEDURE I
8
Burner and Inner Door/Gasket Removal,
ECO-MAGNUM
Inspection, Replacement and
Reinstallation
Inner Door Gasket Replacement Procedure
WARNING
If the information in these instructions is not
followed exactly, a fireor explosion may result causing
property damage, personal injuryordeath.
Step 6. After inspection of inner door as noted in step 5, completely remove gasket and adhesive residue from burner
door and right side inner door as needed.
Step 7. Use RTV sealant (recommended bead size 1/8") to secure the inner door gasket to the inner door sections
(right & burner). The burner door gasket must be sliced in the location shown on the illustration below in
order to slide the gasket over the burner venturi. Refer to illustration below for proper RTV sealant
application. Note the overlap configuration in the flange area of the inner door. Ensure that the chamfer of
the gasket faces outward. Set the flange section first, this will help to achieve the proper overlap position.
75/100-Gallon Atmospheric
Re-installation of Inner Door With Gasket
Step 8. Clean any residual gasket residue or other debris
from combustion chamber surface before
re-installing the inner door/gasket assembly.
Step 9. Place the burner door into position first. Tighten
the feed line nut to the gas control. Use the ¼”
hex drive screw without the built-in washer to
secure burner door to the chamber at position #1.
Use the ¼” hex drive screws with the built-in
washer to secure the door at positions #2 & #3
(see photos 4&5, on page 7).
DO NOT OVER
Page8
TIGHTEN SCREWS.
WARNING
Stripped fastenerconnections may allow
for seal breach of innerdoor. A seal
breach may result in a fireor explosion
causing property damage, personal injury
ordeath. Do not over tighten screws in
steps 9, 11 and 12.
If a fastenerconnection is stripped,
contact the manufacturer listed on the
water heaterrating plate.
ECO-MAGNUM
9
75/100-Gallon Atmospheric
SERVICE PROCEDURE I
Burner and Inner Door/Gasket Removal,
Inspection, Replacement and
Reinstallation
Position ThermopileWire,
Pilot Tube and Igniter Wire
6
Step 10. Position thermopile wires, pilot tube and igniter wire
against burner door flange gasket
(see photo 6).
Step 11. Firmly place right side inner door flange against the burner door flange and secure with two ¼” drive
screws from step 4d (see photo 7). DO NOT OVER TIGHTEN SCREWS.
Step 12. Align right side inner door to combustion chamber and verify the fastener holes of the combustion
chamber are aligned with the right side inner door slotted opening (see photo 7). Verify seal integrity around
combustion opening. Secure right side inner door using 1/4” hex drive screws from step 4c.
DO NOT OVER TIGHTEN SCREWS. Verify both burner and right sides of the inner door are properly
positioned and sealed against the combustion chamber.
Secureflangewith¼"
drive screws.
Verify threaded hole
alignment with slotted
openings in inner door.
7
Step 13. Reconnect red gas valve lead and red thermopile lead to resettable thermal switch. Reconnect white gas
control lead to the gas valve (See photos 1&2 on page 7).
Step 14. Reconnect the pilot tube to the gas control and tighten. Reconnect the igniter wire to the gas control.
Step 15. Replace outer jacket burner access door.
Step 16. To resume operation follow the instructions located on the lighting instruction label or the lighting instructions
located in the installation and operation manual.
Page 9
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