Bradford White 100T399-SOLA Owner's manual

P/N 238-50688-00A 9/14
100T399-SOLA SUPPLEMENT TO INSTALLATION & OPERATION
MANUAL INCLUDED WITH WATER HEATER
(SERIAL NUMBERS BEGINNING LK AND LATER)
-Do not store or use gasoline or other
flammable 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.
Do not touch any electrical switch;
do not use any phone in your
building.
Immediately call your gas supplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
If you cannot reach your gas
supplier, call the fire department.
-For your family’s comfort, safety and
convenience, it is recommended this
water heater be installed and
serviced by a plumbing professional.
If the information in these
instructions is not followed exactly,
a fire or explosion may result
causing property damage, personal
injury or death.
WARNING

2
SECTION III: GENERAL INFORMATION
LOW FIRE START CONTROL FEATURES:
(In addition to pg. 6 of installation & operation manual.)
Honeywell R7910B1009 Control board controls ignition functions, combustion blower, gas valve, tank
temperature, and monitors safety functions in a single control.
An attractive digital display on the top front of the water heater provides for setting and displaying the temperature
setpoint and monitoring the status of the water heater.
Durable direct spark ignition system.
The temperature adjustment range is 70˚F to 180˚F.
Combustion blower speed is reduced prior to ignition to light smoothly at a lower input rating.
Temperature setting may be viewed in either ˚F or ˚C
In Diagnostic Mode the tank temperature and flame sense current can be monitored for service.
Error codes will be displayed in the event the water heater needs service.

3
SECTION VIII: ELECTRICAL CONNECTIONS
(Replaces pg. 38 of installation & operation manual.)
WARNING
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.
All electrical wiring must be installed and grounded in accordance with local codes, or in the absence of local
codes, the National Electrical Code, ANSI/NFPA 70 and/or CSA C22.2 Electrical Code.
The water heater must be wired to a 120 VAC, 60 Hz, 15A power supply. The water heater must be wired on a separate
circuit and breaker. If a flexible line cord and plug is permitted by local code, then provide a three wire grounding type
receptacle within reach of the line cord provided on the control box. Do not plug the line cord into a receptacle that can
have the power supply interrupted by a switch that is used to control lights or another appliance.
If wiring in conduit is required, cut the line cord close to the control board and make the appropriate wiring connections.
Install an electrical conduit connector on the outside jacket of the water heater. Refer to the wiring diagram for the correct
connections to each wire lead.
CAUTION
This water heater must be wired on a separate circuit. Failure to wire on a separate circuit may cause
improper operation or failure of the electrical components of the water heater. Refer to the “Electrical
Connections” section of the Installation and Operation Manual for complete instructions on electrical wiring and
connections to the water heater.
Do not energize the electric circuit before the water heater tank is filled with water.
This control is polarity sensitive. If the hot and neutral supply voltage is reversed, the control will not sense
flame and the water heater will not operate. Verify polarity before connecting the water heater.
Figure 25. Wiring Diagram and Schematic

4
SECTION IX: OPERATING INSTRUCTIONS
SEQUENCE OF OPERATION
(Replaces SEQUENCE OF OPERATION section on pg. 39 of installation & operation manual)
1. Thermostat calls for heat.
2. Blower ON.
3. Blower pre purge at reduced speed.
4. Spark rod sparks to the burner and gas valve opens – burner ignition.
5. Flame signal confirmed.
6. Blower remains at reduced speed for a short time to stabilize flame.
7. Blower increases to full speed for full input rate.
8. Thermostat satisfied.
9. Gas valve closes - Main burner OFF.
10. Blower post purge, then OFF.
LIGHTING AND SHUT DOWN INSTRUCTIONS
(Replaces pg. 40-46 of installation & operation manual.)
Figure 26. Lighting Instruction Label.

5
TEMPERATURE ADJUSTMENT
APPROXIMATE TIME/TEMPERATURE RELATIONSHIPS IN SCALDS
120°F (49°C) More than 5 minutes
125°F (52°C) 1½ to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1½ seconds
155°F (68°C) About 1 second
CAUTION
This water heater, when set at a lower temperature setting is not capable of producing hot water of sufficient
temperature for sanitizing purposes.
This water heater is equipped with an energy cut out device to prevent overheating. Should overheating occur or
the gas supply fails to shut off, turn off the control panel power switch to the appliance and call a qualified service
agency.
NOTICE
The lower the temperature setting, the greater the energy efficiency, both to heat the water and to maintain the
storage temperature during standby periods. Lower water temperatures also extend tank life. Remember, no
water heating system will provide exact temperatures at all times. Allow a few days of operation at this setting to
determine the correct temperature setting consistent with the requirements for the installation.
The water heater temperature setting is adjusted by using the control display mounted to the control surround jacket of the
water heater. The water heater thermostat is set at the lowest setpoint of 70F (21
 C) when shipped from the factory.
The control display shows the temperature setpoint in degrees Fahrenheit (
 F) or degrees Celsius (  C), and the status of
the water heater (“Standby” or “Run”).
For energy efficient operation of your water heater, the suggested initial temperature setting is 120F (49  C). During the
winter season, or any cold period, you may desire a higher temperature setting to adjust for the colder incoming water.
This adjustment, however, may cause additional condensation to form on the cooler tank surface. This does not mean
the tank is leaking. During summer months, the warmer incoming water temperatures will benefit the performance of your
water heater and reduce the amount of condensation developed.
Condensation does not mean your tank is leaking. Most of reported tank leaks on installation are proven to be
condensation. To avoid unnecessary inconvenience and expense, make sure the tank is leaking before calling an
independent servicing contractor or qualified service professional.
If the water heater is to remain idle for 30 days or more or is subjected to freezing temperatures while shut off, the water
heater and piping should be fully drained and the drain valve should be left fully open. Refer to the “General Operation”
section of this Installation and Operation Manual for the procedure on draining the water heater.
DANGER
Hotter water increases the risk of scald injury. Scalding may occur within 5 seconds at a temperature setting of 140°F
(60°C). To protect against hot water injury, install an ASSE approved mixing valve in the water system. This valve will
reduce point of discharge temperature by mixing cold and hot water in branch water lines. A licensed plumbing
professional or local plumbing authority should be consulted.

6
WARNING
If the water heater display does not show “Standby” or “Run”, there may be an operating malfunction with the water
heater. If this is the case, a numeric code will be displayed. Refer to the label next to the display for the definition of
the error code and call your plumbing professional or service agent to service the water heater. Do not try to reset the
water heater without having a qualified service person to diagnose and correct the problem. If the display is blank or
does not show an error code, make sure there is power to the water heater.
Setting the water temperature to the maximum setpoint can result in scalding hot water delivered to the faucets. It is
highly recommended that the setpoint be adjusted to the lowest temperature possible for the needs of the installation.
Make sure the water heater control display is not in a public area that can result in the temperature settings being
improperly adjusted. See previous warning on scalds and an ASSE approved mixing valve.
NOTICE
If the water heater display does not show “Standby” or “Run”, there may be an operating malfunction with the water
heater. If this is the case, a numeric code will be displayed. Refer to the label next to the display for the definition of
the error code and call your plumbing professional or service agent to service the water heater. Do not try to reset the
water heater without having a qualified service person to diagnose and correct the problem. If the display is blank or
does not show an error code, make sure there is power to the water heater.

7
To Increase Setpoint Temperature:
Step 1: Depress and hold “Temperature Up” button until desired setpoint temperature appears in the display.
Step 2: Press “DONE” button for new setting to take effect immediately. If the “DONE” button is not pressed, the new
temperature setting will take effect in approximately 10 seconds.

8
To Decrease Temperature Setpoint:
Step 1: Depress and hold “Temperature Down” button until desired setpoint temperature appears in the display.
Step 2: Press “DONE” button for new setting to take effect immediately. If the “DONE” button is not pressed, the new
temperature setting will take effect in approximately 10 seconds.
NOTICE
Pressing the “NEXT” button instead of “DONE” will enter the display to show unused screens such as “Stack ----˚F,
Outdoor ----˚F, % Rate (Shows percentage of full input rate for Lightoff rate), Outlet ----˚F, Inlet ----˚F, Delta T ----˚F.
These screens are not used in our application. Press DONE to exit this screen back to the DHW setpoint
display.

9
To Change Temperature Format in Display from F to C or ˚C to ˚F:
Step 1: Enter “Set-UP Mode” by pressing both UP/DOWN buttons together for 3 seconds.
Step 2: Pressing either UP or DOWN buttons will toggle between ˚F or ˚C. Press “DONE” when selection is complete.
Display will revert back to DHW setpoint.
NOTICE
Pressing the “NEXT” button instead of “DONE” will enter the display to show “RMT” for Remote Firing Control. This
is for a future feature that is not currently used. The screen may show OFF or ON. If ON, it may display a number
for an address. Press DONE to exit this screen back to the DHW setpoint display.

10
SECTION XI: DIAGNOSTIC AND TROUBLESHOOTING GUIDE
(Replaces pg. 53-71 of installation & operation manual)
LOW FIRE START CONTROL SYSTEM WITH DIRECT SPARK IGNITION
SEQUENCE OF OPERATION
1. When the tank temperature drops below the temperature setpoint on the display, the control sends power to the
combustion blower for a 15 second pre purge period. The combustion blower runs at full speed during this period
to purge the combustion chamber of any unburned gases.
2. The blower speed decreases to the reduced light-off rate speed. Once this reduced speed has stabilized, the
control is ready to start the trial for ignition period to light the burner.
3. After the light-off speed on the combustion blower has stabilized, the control sends high voltage through the spark
cable to the spark rod to spark to the burner and the gas valve also opens.
4. After the burner lights, a microamp current is generated through the flame sense rod allowing the control to detect
burner flame.
5. The sparking then ceases and the flame is monitored by the flame sense circuit until the tank temperature
reaches the thermostat setpoint and turns off the gas valve.
6. After the burner ignites, the blower remains at the reduced light-off rate speed for 10 seconds to allow the flame to
stabilize. After this period, the combustion blower will gradually increase to full speed to allow full input to the
burner.
7. If the burner fails to light, the gas valve closes, sparking to the burner stops, and the combustion blower increases
to full prepurge speed for 15 seconds to purge the heat exchanger of unburned gas.
8. The blower reduces to light-off rate speed and the trial for ignition is repeated. The control will make 3 retries to
ignite the burner. If the burner fails to light after the third retry, the control enters a Hold period which is an idle
period for 15 minutes.
9. There will be a flashing code 110 alternating with the DHW tank temperature shown on the water heater display
indicating that the control cycled through the maximum number of ignition retries for ignition. The control will
make another 4 ignition attempts after the 15 minute waiting period.
10. If the exhaust vent terminal should become blocked or the condensate drain becomes plugged, the exhaust vent
pressure switch will open and the gas valve closes. The combustion blower will postpurge for 30 seconds and
then stop. A lockout code 67 will be displayed on the water heater display.
11. When the blockage is removed, the control can be reset by pressing the lower left button under “Reset”.
12. The burner flame is monitored by the flame sense circuit. If the flame should extinguish, the gas valve closes and
the combustion blower will operate at full speed to purge the heat exchanger before making an attempt to relight
the burner. There may be up to 4 attempts to light the burner before going into the 15 minute ignition hold period
explained previously.
13. The burner will continue to operate during the heating cycle until the thermostat satisfies. The gas valve closes
and the combustion blower continues to operate for 30 seconds to purge the heat exchanger of flue gases.
14. If the tank temperature exceeds 200°F (93°C), the control closes the gas valve and goes into a “Lockout” state
and will not operate until reset by a qualified service person. The display will read lockout code “79”, which
indicates the tank high limit temperature has been exceeded. No attempt should be made to reset the control
until a service person has corrected the cause of the high limit condition.
15. Refer to the diagnostic service section at the end of this Installation and Operation Manual.
ACCESSING DIAGNOSTIC MODE ON THE WATER HEATER DISPLAY (FOR SERVICE PERSONNEL ONLY)
The display has a “Diagnostic Mode” for accessing information in aiding servicing of the water heater. This procedure is
for service and installation personnel only. To enter the Diagnostic Mode, follow the steps illustrated below:
WARNING
The following procedure is for service and installation personnel only. Resetting lockout conditions
without correcting the malfunction can result in a hazardous condition.

11
Step 1: Press and hold the lower right button under “Next” in the lower right display for at least 3 seconds.
NOTICE
The screens will stay in the Diagnostic Mode for 12.5 minutes after the last button press for viewing unless “Done”
button is pressed to exit Diagnostic Mode.
Step 2: The display will show the flame sense current in microamps when the burner is operating.
Step 3: Press the lower right “Next” button and the display will show flash and show the number of any Alert codes.
These are not currently used.

12
Step 4: Press lower right “Next” button and the display will flash and show the number of any Lockout codes.
Step 5: Press lower right “Next” button and the display will show the temperature sensor reading.
Step 6: Press lower right “Next” button and the display will show the manual firing rate adjustment. This function is not
currently used. Any adjustment made has no effect.
Step 7: Press “Done” button on lower left to exit Diagnostic Mode back to DHW setpoint in the User Mode.

13
DIAGNOSTIC ERROR CODES AND TROUBLESHOOTING PROCEDURES FOR 100T399 MODELS WITH
HONEYWELL LOW FIRE START CONTROL SYSTEM
Error Code Definition of Code Cause of Problem and Actions Taken to Correct
No code –
blank display
Check power supply to the water heater.
Make sure water heater is plugged in and the breaker is on.
Check if there is 120 volts power supply to the LINE connections on the
control board.
If 120 volts is present, check for 24 volts output to SECONDARY
terminals on the Control Board.
Check for loose wires, defective transformer.
Check wire harness connections from display to the control board.
3-48, 58-60 Internal Faults
Verify wiring to the wiring diagram.
Check power supply to make sure voltage and frequency is correct.
Check for 24 volts from the transformer to the control board.
Reset module by interrupting power or pressing the reset button on the
module.
49 Voltage too low or high
Measure the incoming line voltage.
Voltage should be 115-125 volts.
If the voltage is not within this range or there is drastic fluctuation, then
have the incoming power supply checked.
If the line voltage is satisfactory, check the output from the transformer
to make sure it is 22-26 volts.
Replace transformer or wiring if defective.
53 AC Inputs phase
reversed
Check the module and display connections.
Check the module power supply and make sure that frequency, voltage
and VA capacity of the transformer meet specifications.
Check to make sure the wiring connections on the control module from
terminals J4-10 and J8-2 are connected together.
62 Fan speed not proved
Check the PWM wire harness connection from the blower to the control
module.
Make sure the pin terminals make solid contact.
Measure the resistance of each wire in the wire harness from the
terminal ends.
Replace wire harness if defective.
67 ILK Off (Interlock Off)
Check wiring to the normally closed blocked vent pressure switches
and vent limit switch.
Use a voltmeter to find out if either pressure switch or the high limit
switch has opened.
If so, determine the cause (blocked vent terminal, clogged condensate
drain, high temperature in compartment).
If limit switches are closed, check wiring for shorts.
Measure continuity.
If limit switches and wiring check O.K., replace control module.
80 High Limit (Overheat
Condition)
Check the wiring from the sensor to the control module.
Measure the resistance of each outside wire to the center wire.
If either outside wire has a much different resistance reading, replace
the sensor.
Make sure the sensor is securely held inside the well with the clip.
If the problem persists and the sensor and wiring check O.K., then
replace the control module.
93 DHW Sensor Fault
Check the sensor wire harness from the sensor to the control module.
Make sure there are no loose connections to the control plug.
Check the resistance reading from each of the outside wires to the
center (common) wire.
If the ohm readings are not fairly close, replace the sensor.
Replace the control module if the problem persists and the sensor and
wire connections are not defective.

14
Error Code Definition of Code Cause of Problem and Actions Taken to Correct
105 Flame detected out of
sequence
Check to see if flame is present inside the combustion chamber before
or after the ignition cycle.
If so, check to make sure the gas valve is wired correctly.
Check for voltage at the gas valve connection.
Replace the gas valve if defective.
If no flame is visible outside of the ignition sequence/run cycle, then
make sure the flame sensor is wired to the correct terminal.
Make sure the ignition cable is not crossing the flame sensor wire or
ignition ground wires.
If problem persists and all other checks have been verified, replace the
control module.
110 Ignition Failure
Occurred.
Burner failed to light or stay lit after 3 retries.
Hold condition – will reattempt ignition after 15 minute waiting period.
Check gas valve wiring and gas valve operation during the ignition
cycle.
If burner lights but quickly goes out, check the flame sensor wire or the
flame sensor.
If the flame sensor rod is badly corroded with deposits, clean with
sandpaper or replace.
Check the inlet gas supply to make sure the pressure is sufficient and
does not drop after the gas valve opens.
Make sure the combustion blower is operating during the ignition and
run cycle.
Check the venting system to make sure the inlet and exhaust terminals
and venting system is not blocked.
122 Light-off Rate Proving
Failed
If blower speed is not verified from the PWM (Pulse Width Modulation)
signal within 5 minutes, the previously described error code “62”
changes from a hold condition to this lockout code condition.
Check the harness and pin terminals for a good connection to the
control module.
Replace the blower or control module if the wire harness is good.

15
Procedure for Checking Thermostat Sensor
Set the thermostat above water temperature (see temperature adjustment section) and observe system through one (1)
complete cycle. Make sure system operates as desired.
To check the sensor, compare the resistance of the sensor wires (either outside black to center wire with yellow marking)
as measured by an ohmmeter to the water temperature as measured by an accurate thermometer. Thermistor resistance
increases as the temperature decreases. The tables below show the correct sensor resistance at various temperatures.
Both thermistors in the sensor assembly should have approximately the same readings. Replace the sensor if the ohm
reading in the chart does not approximate the reading from the sensor at the temperature measured in the tank. Use a
thermometer or thermocouple to measure the temperature from the hot water outlet or T&P valve.
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 3697 3643 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 1567 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
In Degrees C
°C 0 1 2 3 4 5 6 7 8 9
0 32648 31026 29495 28049 26682 25389 24166 23010 21915 20879
10 19898 18968 18088 17253 16461 15710 14998 14322 13680 13071
20 12492 11942 11419 10922 10450 10000 9572 9165 8778 8409
30 8057 7722 7403 7099 6808 8532 6268 6016 5775 5546
40 5327 5117 4917 4726 4543 4368 4201 4042 3889 3742
50 3602 3468 3340 3217 3099 2986 2878 2774 2675 2579
60 2488 2400 2316 2235 2157 2083 2011 1942 1876 1813
70 1752 1693 1637 1582 1530 1480 1432 1385 1340 1297
80 1256 1216 1177 1140 1105 1070 1037 1005 974 944
90 916 888 861 835 810 786 763 741 719 698

16
SECTION XII: PARTS LIST
(Replaces pg. 72-74 of installation and operation manual.)
Water Heater Full
Assembly
1 Combustion Surround Assembly
2 Burner Assembly (Specify model)
3 2nd Pass Top Collector Cover
4 Screw 10-16 x 3/4"
5 Vent Termination Elbow
6 Thermostat Sensor Probe
7 Baffle 4” Flue (Specify Model)
8 Power Anode (2 PLS.)
9 Baffle 2” Flue
10 Wire Harness-Service Panel
11 Plastisert Nipple 1” NPT
12 Plug
13 Nipple
14 T&P Relief Valve
15 Exhaust Collector
16 Condensate Trap Elbow
17 Silicone hose
18 Outer Door Service Panel (Specify model)
19 Clip
20 NSF Escutcheon
21 Exhaust Pressure Switch
22 Nuts
23 Collector Limit Switch
24 Screw 6-32 x 3/8”
25 Cleanout Access Cover
26 Cleanout Gasket
27 Screw 5/16 - 18 x 3/4" HH Grade 5
28 Cleanout Cover
29 Cold Water Inlet (Hydrojet) Assembly
30 No Handle Brass Drain Valve
31 Concentric Vent System (Optional)
32 Thermostatic Mixing Valve (Optional)
33 Thermal Well
34 ASME Cleanout Access Cover
35 ASME Cleanout Gasket
36ASME Screw 5/16 - 18 x 3/4" HH
Grade 5
37Intake Pressure Switch
Customer must specify complete model
number and serial number when ordering
service parts.

17
1 Combustion Surround Assembly
AA Keeper Latch & Catch
BB Screw 8-32 x 1/2" RHCR
CC Control Panel Assembly
DD Jacket Head 28 1/4“ Grey
EE Switch Main Power
FF Control Display
GG Combustion Surround
JJ Surround Base/Jacket Head
KK Display Harness
2 Combustion Assembly
1A Combustion Ass’y (Specify model) 14A Inlet Pipe
2A Blower/Gas Valve Ass’y (Specify model) 15A Gasket Blower Transition (Specify model)
3A Burner Ass’y (Specify model) 16A Screw 8 -32 x 1/4" RHCR
4A Blower (Specify model) 17A Gasket Flame Sensor
5A Silicone Hose 18A Flame Sensor
6A Burner Mounting Insert Gasket 19A Transition Tube
7A Screw 10-32 x 3/4"SHCS 20A Nut Hex Washer
8A Gasket & Screw 21A Gasket Igniter
9A Gas Valve (Specify model) 22A Spark Rod
10ANipple 23A Burner Mounting Gasket
11AReducer 24A Burner (Specific Model)
12ANipple 25A Burner Mounting Gasket
13AFlex Reducer 26A Burner Mounting Insert
Customer must specify complete model
number and serial number when ordering
service parts.

18
Manufactured under one or more of the following U.S. Patents: 5,277,171; 5,341,770; 5,372,185; 5,485,879; 5,574,822; 5,596,952;
5,660,165; 5,682,666; 5,761,379; 5,943,984; 5,954,492; 5,988,117; 6,056,542; 6,142,216; 6,442,178; 6,684,821; 6,935,280; 7,063,132;
7,063,133; 7,007,748; 7,270,087; 7,334,419; 7,337,517; 7,409,925; 7,458,341; 7,559,293; 7,621,238; 7,634,976; 7,650,859; 7,665,210;
7,665,211; 7,699,026; 7,866,168; 7,900,589; 7,971,560; 7,992,526 8,082,888; 8,146,772; Other U.S. and Foreign patent applications
pending. Current Canadian Patents: 2,092,105; 2,107,012; 2,108,186; 2,112,515; 2,143,031; 2,239,007; 2,262,174; 2,314,845;
2,409,271; 2,476,685; 2,504,824; 2,548,958
CC Ignition Control Assembly
1C Control Mounting Panel 9C Power Cord Harness
2C Ignition Control 10C Low Fire Start Control Harness
3C Transformer – 120/24 VAC 11C Direct Spark Igniter Harness
4C Powered Anode Module 12C Flame Sensor Harness
5C Powered Anode Module Harness 13C Blower Control Harness
6C Powered Anode Harness 14C Blower Power Supply Harness
7C Gas Valve Control Harness 15C Display Board Harness
8C Temperature Sensor Probe
Customer must specify complete model number and serial number when ordering service parts.

19
NOTES

20
NOTES