The Bradford White
Ultra High Efficiency Water Heaters
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by qualified service providers)
For The Bradford White
eF Series Ultra High Effeciency
Models:
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EF60T125E*(NA,XA)(2)
EF60T150E*(NA,XA)(2)
EF60T199E*(NA,XA)(2)
EF100T150E*(NA,XA)(2)
EF100T199E*(NA,XA)(2)
EF100T250E*(NA,XA)(2)
EF100T300E*(NA,XA)(2)
EF100T399E*(NA,XA)(2)
(*) Denotes Warranty Years
Manual 45817B
Save this manual for future reference
The Bradford White
Ultra High Efficiency Water Heaters
Table of Contents
Page
eF Service Procedure
Introduction
3
---
How to use this manual
4
---
Tool required for service
4
---
Specifications
5
---
Sequence of Operation
8
---
Troubleshooting
12
---
Thermostat Circuit, Testing & Replacement
14
I
Combustion System Testing and Replacement
20
II
Burner Tube Inspection & Replacement
24
III
Gas Valve Replacement
26
IV
Blower Testing and Replacement
27
V
Exhaust Pressure Switch Testing and Replacement
29
VI
Hot Surface Igniter Testing and Replacement
35
VII
Flame Sensor Testing and Replacement
37
VIII
Ignition Module Replacement
39
IX
Transformer Replacement
40
X
Intake Pressure Testing and Replacement
41
XI
Vent Safety Switch Testing and Replacement
43
XII
Anode & Flue Baffle Inspection and Replacement
45
XIII
Installation Check List
50
---
Heater Service Report
51
---
Parts List
52
---
Glossary of Terms
58
---
Page 2
Introduction
The Bradford White eF Series Ultra High Efficiency Water Heater is designed to
deliver a remarkable thermal efficiency rating in a quiet running unit with venting
options that allow for installation flexibility. Several technologically advanced
design features are incorporated in the design that will require additional
knowledge on the part of the qualified service provider. The information in this
manual will instruct service and maintenance professionals on the function, proper
diagnosis and repair of The Bradford White eF Series Ultra High Efficiency Water
Heater.
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The Bradford White eF Series Ultra High Efficiency Water Heater uses a low Nox
premix power burner located at the top of the water heater to direct a turbulent
flame down into a submerged combustion chamber. This turbulence causes a
thorough mixing of gas and air for optimum combustion. The combustion gases
then travel through a three pass flue system keeping the gases moving at a high
velocity. The combination of high turbulence and velocity results in an optimum
transfer of heat from the flue gases into the water.
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Burner operation is controlled using an electronic ignition module. The module
monitors the status of the electronic thermostat, vent temperature limit switch, vent
system pressure switches and a flame sensor to control output voltage to blower
motor, hot surface igniter and gas valve. The module contains programming which
determines the sequence of operation and timings for purge periods, trial for
ignition, flame sensing and lockout. The module will also provide diagnostic
information on LEDs to help in determining the cause of system lockouts.
The contents in this manual are detailed informational tools to assist in the proper
diagnosis of the eF Series Ultra High Efficiency Water Heater operational faults.
Please read this service manual completely and provide as much information
regarding the eF Series Ultra High Efficiency Water Heater operation and
installation specific concerns.
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Page 3
How to Use This Manual
It is intended for this manual to be used by qualified service personal for the primary purpose of
troubleshooting analysis and repair of the Bradford White eF Series Ultra High Efficiency Water
Heater. Understanding the sequence of operation section of this manual will contribute greatly to
troubleshooting this product.
R
An “Installation Check List” is shown on page 50. Compare the installation against the installation
check list to confirm all requirements are met.
An “eF Service Report” is shown on page 51. Completing this form will assist in the
troubleshooting efforts. Should you need to call for technical support, Please provide the
information shown on this form to the support technician to insure accurate troubleshooting.
Troubleshooting begins with “System Observation” to determine failure mode as indicated by the
LED status of the ignition module. Troubleshooting continues with “Failure Modes and Probable
cause” listed on page 11 directing the service provider to a series of test procedures to determine
root cause of failure. Component replacement procedures directly follow the test procedures for a
given component.
In some difficult to diagnose conditions, it may be necessary to isolate the heater from the vent
system to determine root cause.
Contact Technical support immediately if diagnosis is not determined using the methods described
in this service manual.
Tools Required for Service
Manometer:
Two types available, a liquid “U” tube type or a digital (magna-helic)
type. This device is used to measure gas and/or air pressures 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.
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.
Jumper Leads:
A length of wire (12" min.) with alligator clip at both ends.
Various Hand Tools:
Pipe wrench, channel locks, open end wrench set, 12" crescent wrench,
Allen wrench set, torx bit set, screw drivers (common & phillips), long
reach (12") magnetic tip phillips head screw driver #2 tip, ¼" nut driver,
pliers (common & needle nose), socket set including a 1-1/16 deep well
socket, wire cutters, wire strippers, wire crimpers, torpedo level, small
shop vac, step ladder, and flashlight.
Page 4
Specifications
Recovery GPH
at Degree Rise
Model No
EF60T125
EF60T150
EF60T199
EF100T150
EF100T199
EF100T250
EF100T300
EF100T399
Input
Rate
BTU/h
1st Hr
Del
Gal
at
100°F
Rise
40°F
125,000
150,000
199,999
150,000
199,999
250,000
300,000
399,999
187
211
265
250
309
364
405
521
363.6
422.7
557.6
450.5
597
734.8
836.4
1,127
100°F
145.5
169.1
223
180.2
238.8
293.9
334.5
451
140°F
103.9
120.8
158
129
171
210
239
322
DIMENSIONS (INCHES)
Stg
Cap
U.S.
Gal
Therm
Eff
%
Ht
60
60
60
100
100
100
100
100
96.0
93.0
92.0
99.1
98.5
97.0
92.0
93.0
57
57
57
77 5/8
77 5/8
77 5/8
77 5/8
77 5/8
A
C
D
E
F
G
H
Dia
Flr
to
Vent
Outlet
Flr to
Inlet
Wtr
Conn
Flr to
T&P
Valve
Conn
Flr To
Outlet
Wtr
Conn
Flr. To
Air
Intake
Flr to
Gas
Conn
28 3/8
28 3/8
28 3/8
28 3/8
28 3/8
28 3/8
28 3/8
28 3/8
5
5
5
5
5
5
5
5
13
13
13
13
13
13
13
13
40
40
40
60
60
60
60
60
42 ¼
42 ¼
42 ¼
62 ¼
62 ¼
62 ¼
62 ¼
62 ¼
52 ½
52 ½
52 ½
73 1/8
73 1/8
73 1/8
73 1/8
73 1/8
53 ½
53 ½
53 ½
74 ¾
74 ¾
74 ¾
74 ¾
73 ¼
B
Front
Wtr
Conn
Dia
Space
Heating
Conn
Dia
Gas
Conn
Dia
T&P
Valve
Open
Shpg
Wt
(lbs)
1½
1½
1½
1½
1½
1½
1½
1½
1
1
1
1
1
1
1
1
¾
¾
¾
¾
¾
¾
¾
1
¾
¾
¾
¾
¾
¾
¾
1
570
570
570
900
900
900
900
950
Page 5
Specifications
Power supply
Approved Gas Type
Dedicated 120 VAC, 60 Hz, 15A, GFI
Minimum 1" NPT for EF100T399, all others ¾" NPT
(schedule 40 black iron pipe recommended)
Natural or Propane. Unit must match gas type supplied.
Gas Pressure (Nat & L.P.)
14.0" W.C. maximum static, 4.5" W.C. minimum running (recommend 7.0" W.C. min running)
Venting System
Power vent, balanced direct vent or unbalanced direct vent. See vent tables on page 7
Gas Supply
Approved Vent Materials PVC, CPVC or ABS
Minimum Clearance
for Servicing
18" from top, 24" from front, 4" sides and rear.
Maximum Water Supply
Pressure
150 PSI
Thermostat Sensor
11,900 Ohms @ 70°F, ECO opens @ 201°F Max., ECO close @ 100°F Min.
Temperature Dial
Min. set point 5400-6600 ohms, Max set point 0-50 ohms.
Thermostat Board
Max temp 180°F, Min temp 91°F, 24VAC, 60Hz max.
Ignition Module
See page 11.
Transformer
120VAC primary, 24VAC secondary, 40VA.
Hot Surface Igniter
120VAC, 30-120 ohms @ room temperature.
Flame Sensor Output
Minimum 1 micro amp, Typical range 4 to 7 micro amps.
Gas Valve
Negative regulation, 24 VAC, ½" PSI max., 4.5" W.C. Minimum running inlet.
Vent Safety Switch
Normally closed, opens @ 350°F, manual reset.
Intake Pressure Switch
“CF” serial number or
later
Intake Pressure Switch
serial numbers prior to
“CF”
Blocked Vent Pressure
Switch “CF” serial
number or later
Not required.
24VAC, normally closed, opens on vacuum increase @ -1.20 W.C.
24VAC, normally closed, opens when pressure increases to +2.70 W.C.
Exhaust pressure switch
serial numbers prior to
“CF”
24VAC, normally open, closes on pressure increase as follows
Note 1:
+2.58" W.C.
EF(60,100)T199
+1.50" W.C.
EF100T150 (see note 2)
+1.22" W.C.
EF60T150, EF100T250
+2.08" W.C.
EF60T125
+0.55" W.C.
EF100T300 (see note 3)
Note 2: +5.6" W.C. on serials prior to AH5039107
Note 3: +0.8" W.C. on serials prior to AK5288269
Blower
120VAC, 60Hz, .6-1 amps, 6400 RPM.
Combustion Levels
CO2: 10-11%, CO: less then 0.04 percent (400 PPM) air free
Page 6
Specifications
Vent Tables
Balanced Direct Vent Systems
PVC, CPVC or ABS
Total length of intake piping and exhaust
piping added together must not exceed
“Maximum Combined Length”
Shown below
Power Vented Systems
PVC, CPVC or ABS
Total length of exhaust piping must not
exceed “Maximum Vent Length”
Shown below
Maximum Combined Length (feet)
Maximum Vent Length (feet)
Model Number
3"
4"
EF60T125, EF100T150
120'
170'
Model Number
3"
4"
EF60T150, EF100T199
100'
150'
EF60T125, EF100T150
120'
170'
EF60T199, EF100T250
80'
130'
EF60T150, EF100T199
100'
150'
EF100T300
60'
110'
EF60T199, EF100T250
80'
130'
EF100T399
50'
100'
EF100T300
60'
110'
Unbalanced Direct Vent Systems
Air intake CAN NOT exceed exhaust by
more than 30 feet
EF100T399
50'
100'
Notes:
1) Multiply the total number of 90° elbows (intake and exhaust) by 5 feet. Do not include the
termination fittings or 3" condensate elbow.
2) Multiply the total number of 45° elbows (intake and exhaust) by 2 ½ feet.
3) Add this to the total length of straight pipe - intake and exhaust.
4) The sum total of all elbows and straight pipe - intake and exhaust must not exceed maximum
lengths from tables above.
Example: EF100T199
A 3" Balanced Direct vent system has 30 feet of straight exhaust pipe and 30 feet of straight
intake pipe. It has 3- 90° elbows in the exhaust and 3- 90° elbows in the intake. It has 1- 45°
elbow in the exhaust and 1- 45° elbow in the intake.
Therefore:
6- 90° elbows x 5 feet = 30 feet.
2- 45° elbows x 2½ feet = 5 feet.
60 feet of straight pipe + 30 feet + 5 feet = 95 feet.
System is within “Maximum Combined Length” from table above.
Page 7
Sequence of Operation
For models prior to CF serial numbers
For models prior to CF serial numbers
1
Thermostat calls for heat.
-Prior to energizing blower, ignition module checks safety circuits for normal switch positions:
a) Vent temp switch normally closed.
b) Intake pressure switch normally closed.
c) Exhaust pressure switch normally open.
If the vent temp switch is open, the control waits indefinitely for temp switch to close (green light stays on).
If the exhaust pressure switch contacts are closed (not in normal position), the ignition module will wait 45 seconds for
pressure switch contact to open before energizing blower. If after 45 seconds and pressure switch contacts do not open,
the ignition module locks out with the PURGE light flashing indicating pressure switch fault.
2
Blower energizes.
3
Pressure switch proves blower/vent system operation.
If the N.O. contacts of the exhaust pressure switch do not close within 5 minutes of the blower being on,
the control locks out with the PURGE light flashing indicating pressure switch fault.
4
Blower pre-purge period (5 seconds) indicated by the PURGE LED on the module.
5
Igniter warm up (18 seconds), indicated by the IGNITER LED on the module.
6
Trial for ignition (4 seconds, three trials).
a) Flame establishing period (2.5 seconds) gas valve and igniter on, indicated by the IGNITER and VALVE LED
on the module.
b) Burner on, flame proving period (1.5 seconds, looking for minimum of 1 micro amps), indicated by the FLAME
& VALVE LED on the module.
7
Steady state operation.
Ignition module monitors:
- Thermostat circuit.
- When thermostat opens, gas valve is shut down and post purge begins.
- Safety circuit.
- If vent temp switch opens, gas valve is shut down, system will post purge and wait for switch to close before
attempting re-ignition.
- If either pressure switch opens, Gas valve is shut down, Blower is shut down for 30 seconds after which blower
is re-energized and system attempts re-ignition starting at pressure switch proving mode.
-Flame sensor circuit.
- If flame is lost, gas valve is shut down, system will post purge and system attempts
re-ignition starting at pressure switch proving mode.
8
Thermostat satisfies.
9
Burner off.
10
Blower post purge (15 seconds).
Page 8
Sequence of Operation
For models prior to CF serial numbers
For models prior to CF serial numbers
Lockout Conditions
If normally closed pressure switch contacts open during burner operation, gas valve closes, burner shuts off. Blower
restarts after 30 seconds and runs 5 minutes to wait for pressure switch to close. If not, locks out.
The system will go into lock out mode for the following reasons:
- Pressure switches stuck open or closed.
a) Check for exhaust or intake obstructions.
b) Check for compliance with vent tables.
c) Check for evidence of moisture or condensate present in pressure switch tubing or pressure switch.
- No ignition after 3 attempts.
a) Check gas pressures.
b) Igniter resistance too high (lower resistance preferred <150 Ohms).
c) Check venturi screw adjustment (6 ½ turns from bottom)
d) Flame sense micro amp not present (1 to 5 micro amps required).
Lock out reset is accomplished by shutting OFF the line voltage to the system or opening the 24V thermostat
circuit for at least 2 seconds.
System will automatically reset lockout after 1 hour of continuous call for heat from the thermostat. Three ignition trials will
be attempted each hour until the thermostat is satisfied.
Ignition Module Specifications
Control Functions:
- Ignition & heating functions in response to thermostat.
- Hot surface ignition using a microprocessor to control timing, flame sensing using flame rectification & ignition
retries.
- Monitoring of system pressure switches and limit switches.
- Control of gas valve, inducer motor, and hot surface igniter element based on thermostat demand and status of
safety inputs.
- Diagnostic indicators to provide information on power to control and control status.
- Non-interchangeable polarized plug-in connectors for all interconnections.
Control Inputs:
Control Outputs:
- Thermostat call for heat.
- Limit Switch Circuit (normally closed)
- Pressure Switch Circuit (normally open)
- Flame sensing.
- Low voltage supply.
- Line voltage supply.
- Inducer motor
- Hot surface igniter
- Gas valve
- Status indicator LEDs
Power - Green
Purge - Red
Igniter - Red
Valve - Red
Flame - Red
IGNITION MODULE
WIRING DIAGRAM
Page9
Sequence of Operation
For models starting with
CF serial numbers and later.
For models starting with CF serial numbers and later.
1
Thermostat calls for heat.
Prior to energizing blower, ignition module checks to make sure the vent temperature switch is in the normally closed
position. If the vent temperature switch is open, the control waits indefinitely for the temperature switch to close.
2
Blower energizes, pressure switch contacts are normally closed. If the pressure switch contacts are open, blower
operates for up to 5 minutes waiting for contacts to close, then blower stops and flashes red PURGE LED indicating lockout condition.
3
Blower pre-purge period (5 seconds) indicated by PURGE LED on the module
4
Igniter warm up (18 seconds), indicated by the IGNITER LED on the module. Note: The blocked vent pressure switch
must be in the normally closed position for the ignition cycle to start.
5
6
Trial for Ignition (4 seconds, 3 trials).
a) Flame establishing period (2.5 seconds), gas valve and igniter on, indicated by the IGNITER and VALVE LED on the
module.
b) Burner on, flame proving period (1.5 seconds, looking for minimum of 1 micro amps), indicated by the FLAME &
VALVE LED on the module.
Steady state operation.
Ignition module monitors:
- Thermostat circuit.
- When thermostat opens, gas valve is shut down and post purge begins.
- Safety circuit.
- If vent temperature switch opens, gas valve is shut down, system will post purge and wait for switch to close
before attempting re-ignition.
- If the blocked vent pressure switch opens, indicating a blocked exhaust vent condition, the gas valve is shut
down, blower shuts down for 30 seconds and is re-energized and system attempts re-ignition if the pressure
switch is closed. Blower operates for 5 minutes to wait for pressure switch to close, then shuts off with purge
light flashing (lock-out). Will restart in 1 hour to attempt to close the switch and restart ignition sequence.
- Flame sensor circuit.
- If flame is lost, gas valve is shut down, system will post purge and system attempts re-ignition.
7
Thermostat satisfied.
8
Burner off.
9
Blower post purge (15 seconds).
Page 10
Sequence of Operation
For models starting with
CF serial numbers and later.
For models starting with CF serial numbers and later.
Lockout Conditions
Lockout conditions:
The system will go into lock out mode for the following reasons:
Blocked vent pressure switch contacts open:
Check for obstruction in exhaust pipe and vent terminal.
Check for blocked condensate trap or drain line. In cold climates, make sure drain is not frozen.
No ignition after 3 attempts:
a) Check inlet and outlet gas pressures (pressure taps located on top of gas valve).
b) Igniter resistance too high (lower resistance preferred < 150 ohms).
c) Misadjusted veturi screw (should be 6.5 turns out from bottom).
d) Flame sense microamp not present (1.0 microamps minimum, should be 5 microamps or more). If burner lit,
check flame rod for deposits.
e) Check burner tube condition. Refer to section EF-III for Burner Tube Inspection and Replacement.
Ignition Module Specifications
Control Functions:
- Ignition & heating functions in response to thermostat.
- Hot surface ignition using a microprocessor to control timing, flame sensing using flame rectification & ignition
retries.
- Monitoring of system pressure switches and limit switches.
- Control of gas valve, inducer motor, and hot surface igniter element based on thermostat demand and status of
safety inputs.
- Diagnostic indicators to provide information on power to control and control status.
- Non-interchangeable polarized plug-in connectors for all interconnections.
Control Inputs:
Control Outputs:
- Thermostat call for heat.
- Blocked vent pressure switch
(normally closed)
- Flame sensing.
- Low voltage supply.
- Line voltage supply.
- Inducer motor
- Hot surface igniter
- Gas valve
- Status indicator LEDs
Power - Green
Purge - Red
Igniter - Red
Valve - Red
Flame - Red
WIRING DIAGRAM
IGNITION MODULE
Page 11
Troubleshooting
System Observation
Is front panel power
switch light on,
indicating power?
N
WARNING
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.
Position front panel
power switch to
“ON” position.
Y
1
Is there 120VAC
across switch?
(see photo 1)
Y
Light burned out,
replace switch.
N
Is there 120VAC
Y
across terminal block?
(see photo 2)
Repair/replace wire
harness to switch.
2
N
Determine power
source problem and
correct.
Is ignition module
power light on?
N
Refer to ignition module
illustration, is there 120VAC
going to module at locations
P7(1) and P7(3)?
Y
N
Y
Replace ignition module.
(see pg 39)
Refer to ignition module
illustration, is there 24VAC
going to module at locations
P2(1) and P2(2)?
Refer to ignition module
Y
illustration, is there 120VAC
between P1(1) and P1(3)?
N
N
Replace ignition module.
(see pg 39)
Replace transformer.
(see pg 40)
IGNITION MODULE
Is ignition module
power and flame light
flashing?
Y
Supply voltage polarity
is incorrect.
N
Reset heater by
interrupting power.
Reestablish power and
Adjust thermostat to
call for heat,
tank must be cold.
Allow heater to run
through heating cycle.
Did heater complete
heating cycle and did
blower post purge?
N
See page 13.
Y
System is OK.
Page 12
Troubleshooting
LED status & probable cause
Determine failure mode by observing flashing LED status on ignition module.
LED status and probable cause shown below.
* Denotes conditions that may require the heater to be isolated from the vent system to
determine root cause.
LED STATUS
Only power light
is on and heater will
not function.
Probable Cause*
Exhaust pressure
switch. For models
prior to CF serial
number (see page 29)
for serial ”CF” and
later see page 31
Probable Cause
Thermostat circuit.
(see page 14)
Probable Cause
Vent safety switch.
(see page 43)
Probable Cause
Blower.
(see page 27)
Probable Cause*
Intake pressure switch.
Only for models prior
to CF serial number
(see page 41)
Probable Cause*
Combustion system.
(see page 20)
Probable Cause
Flame sensor.
(see page 37)
LED STATUS
Purge light flashing.
Probable Cause*
Exhaust pressure
switch. For models
prior to CF serial
number (see page 29)
for serial ”CF” and
later see page 31
LED STATUS
Valve light flashing.
Probable Cause
Hot surface igniter.
(see page 35)
LED STATUS
Power & flame
light flashing.
Probable Cause
Supply voltage
polarity.
Page 13
SERVICE PROCEDURE EF-I
Thermostat Circuit Testing and Replacement
IMPORTANT NOTE: This procedure assumes a cool tank
WARNING
120 volt potential exposure. Use
caution making voltage checks
to avoid personal injury.
Rotate temperature
dial to highest setting.
Refer to ignition module
illustration, Is there 24VAC
between P3(7) and P3(8)?
Y
OK, thermostat is
calling for heat.
N
Thermostat
not calling
IGNITION MODULE
Turn off power to heater.
Disconnect YELLOW and RED wires from the
thermostat board at location N.O. and COM shown in
photo 3. Use a jumper to connect these two wires
together as shown in photo 3a.
Restore power to heater.
Did heater cycle on?
N
See page 16
3
Y
Check thermostat sensor
for proper resistance
(OHMS) across blue wires.
(See Appendix A, page 15)
Are readings correct?
(see photo 4)
3a
N
Replace
thermostat sensor.
(see pg 19)
Y
Check sensor harness
continuity.
Is there continuity?
N
Replace harness.
4
Y
Check temperature dial for
proper resistance (OHMS)
(See Appendix B, page 15)
Are readings correct?
(see photo 5)
N
Replace temperature dial
(potentiometer).
(see pg 18)
Y
Check temperature dial
harness continuity.
Is there continuity?
5
N
Replace harness.
Y
Replace thermostat
circuit board.
(see pg 17)
Page 14
SERVICE PROCEDURE EF-I
Thermostat Circuit Testing and Replacement
APPENDIX - A
Sensor Resistance at Various Temperatures
Be Careful When Making Voltage Measurements or Jumping Terminals
Not to Damage or Deform Connectors or Connector Pins.
Draw Water From The T&P Valve. Compare Temperature With
Temperature Ohms Chart Below.
Example: If temperature of sensor is 84°F, then the resistance through the sensor would be 8449 (see shaded area).
NOTE: Sensor resistance increases as the temperature falls.
°F
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
0
26109
19906
15314
11884
9299
7333
5827
4663
3758
3048
2488
2043
1688
1402
1170
982
828
1
25400
19383
14925
11592
9078
7165
5697
4562
3679
2986
2439
2004
1656
1376
1150
965
814
2
24712
18876
14548
11308
8862
7000
5570
4464
3602
2925
2391
1966
1625
1351
1129
949
801
3
24045
18383
14180
11032
8653
6839
5446
4368
3527
2866
2344
1928
1595
1327
1110
933
788
In Degrees
4
23399
17905
13823
10763
8449
6683
5326
4274
3453
2808
2298
1891
1566
1303
1090
917
775
F
5
22771
17440
13477
10502
8250
6531
5208
4183
3382
2752
2253
1856
1537
1280
1071
901
762
6
22163
16990
13140
10248
8057
6383
5094
4094
3312
2697
2209
1820
1509
1257
1053
886
749
7
21573
16553
12812
1000
7869
6238
4982
4006
3244
2643
2166
1786
1481
1235
1035
871
737
8
21000
16128
12494
9760
7685
6098
4873
3922
3177
2590
2124
1753
1454
1213
1017
857
725
9
20445
15715
12185
9526
7507
5961
4767
3839
3112
2538
2083
1720
1427
1191
999
842
713
APPENDIX - B
Temperature Dial Resistance
Proper Readings Should Be Greater Then 4800 Ohms at
Minimum Setting
And Less Then 50 Ohms at Maximum.
Be Careful When Making Voltage Measurements or Jumping Terminals
Not to Damage or Deform Connectors or Connector Pins.
Page 15
SERVICE PROCEDURE EF-I
Thermostat Circuit Testing and Replacement
WARNING
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.
Thermostat circuit.
(continued from page 14)
Check AC source to
determine why there is no
power.
Replace
ignition module.
(see pg 39)
Y
Refer to ignition module
illustration, Is there 120VAC
between P1(1) and P1(3)?
N
Refer to ignition module
illustration, Is there 120VAC
between P7(3) and P7(1)?
N
Y
Refer to ignition module
illustration, Is there
22 - 27VAC between
P2(1) and P2(2)?
N
IGNITION MODULE
Replace transformer.
(see pg 40)
Y
6
Refer to ignition module
illustration, Is there 24VAC
between P3(9) and P2(1).
N
Y
Check continuity through
ECO, red wires of
thermostat sensor.
Check at temperature
less than 160°F
Is there continuity?
(see photo 6)
Y
N
Replace ignition module.
(see pg 39)
Check wire harness
continuity. Replace
thermostat sensor or wire
harness as necessary.
(see pg 19)
Replace thermostat
circuit board.
(see pg 17)
Page 16
SERVICE PROCEDURE EF-I
Thermostat Circuit Testing and Replacement
Thermostat Board Replacement Procedure
Step 1. Position main power switch to “OFF”
Step 2. Disconnect (unplug) water heater from 120
volt power source.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 3. Un-latch and remove top surround cover
from top of heater.
7
Step 4. Locate thermostat board on control panel.
(see photo 7)
Thermostat
Board
Step 5. Carefully disconnect all wires from thermostat
board.
Note: it may be necessary to identify wires
for proper re-connection.
Step 6. Remove the two screws (Phillips head screw
driver) that secure thermostat board to
control panel.
Step 7. Install new thermostat board to control panel
using screws from step 6.
Step 8. Carefully reconnect wiring per the wire
diagram below. Reconfirm wire
connections are correct prior to putting
heater back in service
Step 9. Restore 120 volt power supply to water
heater and confirm proper operation following
the lighting instructions on the lighting
instruction label or the lighting instruction
located in the installation and operating
instruction manual.
Step 10. Replace surround cover on top of heater.
WIRING DIAGRAM
For models starting with
CF serial numbers and
later.
Page 17
Mounting
screw locations
WIRING DIAGRAM
For models prior to
CF serial number
SERVICE PROCEDURE EF-I
Thermostat Circuit Testing and Replacement
Thermostat Potentiometer Replacement Procedure
Step 1. Position main power switch to “OFF”
Step 2. Disconnect (unplug) water heater from
120 volt power source.
Step 3. Un-latch and remove top surround cover
from top of heater.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 4. Loosen set screw of adjusting
knob (small blade screw driver)
and remove adjusting knob
from potentiometer. (see photo 8)
8
Temperature
adjusting knob
Step 5. Remove retaining nut (½" wrench)
and washer from potentiometer.
(see photo 9)
9
Step 6. From inside of surround area, remove potentiometer
with gasket from side of surround. Notice how indexing
tab on potentiometer assembles into locating hole of
surround. (see photo 10)
Indexing
tab
10
Locating
hole
11
Step 7. Disconnect potentiometer wire leads.
(see photo 11)
Step 8. Install new potentiometer with gasket into side of surround. Be sure to assemble with
indexing tab inserted into locating hole on side of surround (see photo 10).
Step 9. Reconnect wires to potentiometer. Note: Wire leads are interchangeable with either wire.
Step 10. Restore 120 volt power supply to water heater and confirm proper operation following
the lighting instructions on the lighting instruction label or the lighting instruction located
in the installation and operating instruction manual.
Step 11. Replace surround cover on top of heater.
Page 18
SERVICE PROCEDURE EF-I
Thermostat Circuit Testing and Replacement
Thermostat Sensor (Thermister) Replacement Procedure
Step 1. Position main power switch to “OFF”
Step 2. Disconnect (unplug) water heater from
120 volt power source.
Step 3. Drain heater down to a point below
the top of the tank.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 4. Un-latch and remove top surround cover
from top of heater.
Step 5. Fold back insulation just in front of burner to expose temperature sensor
(see photo 12).
Step 6. Disconnect temperature sensor from
harness (see photo 13).
12
13
Disconnect sensor
from harness
Insulation folded
back to expose
temperature sensor
Step 7. Remove temperature sensor (1-1/16" hex, deep well socket) from heater.
Note: Using a deep well socket will allow room inside socket
for sensor connector and wires.
Step 8. Apply Teflon tape or applicable thread lubricant to threads of new sensor. Install new
thermostat sensor and Connect to wire harness from step 6.
Step 9. Fold insulation back into place. Be sure there are no wires in contact with burner.
Step 10. Restore 120 volt power supply and water supply to water heater, check and repair any
leaks found. Confirm proper operation following the lighting instructions on the lighting
instruction label or the lighting instruction located in the installation and operating
instruction manual.
Step 11. Replace surround cover on top of heater.
Page 19
SERVICE PROCEDURE EF-II
Combustion System Testing and Replacement
Observe burner operation through the sight glass located on the combustion insert mounting flange.
Normal burner operation should ignite smoothly, without evidence of coughing or huffing upon
ignition. The burner flame should be a blue flame near the burner surface in a uniform flame pattern.
Occasional yellow or white streaks are normal.
Note: On higher input models using metal fiber mesh burner (serial
number “CK” and later) a red glow from the burner surface is normal.
Verify Minimum Gas Supply Piping Requirements of:
Minimum 1" NPT for EF100T399, all others use ¾"
NPT. (Schedule 40 black Iron Pipe recommended).
Y
N
Reconfigure gas
supply piping
Inadequately
sized regulator.
N
With manometer, check inlet
gas pressure. Is it stable
N
between 7" & 14" W.C. static?
(heater not running)
(see illustration 14)
Is gas supply pressure
regulator adjustable to Y
maintain proper and
stable setting?
Adjust gas
supply regulator
14
Venturi
adjustment
Y
WARNING
Does inlet gas pressure
drop more than 2" W.C.
during burner ignition?
Inlet gas
pressure tap
Removing screw from
inlet gas pressure tap will
immediately allow gas to
flow from pressure tap.
Y
N
WARNING
120 volt potential
exposure. Use caution
making voltage checks to
avoid personal injury.
Replace ignition
module.
(see pg 39)
N
Do you see the igniter
glowing through burner
site glass during the
warm up period?
N
Refer to ignition module illustration below,
is there 120VAC across terminals
P6(1) and P6(2)?
(Note: Igniter LED must be lit during this check).
Y
IGNITION MODULE
Y
Volt meter set to
OHM setting
Is igniter resistance
less than 150 Ohms
(cold)?
(see check igniter
illustration)
N
Replace
hot surface igniter.
(see pg 35)
Meter probe
Y
Proceed to page 21
Hot surface
igniter
CHECK IGNITER
RESISTANCE
Page 20
SERVICE PROCEDURE EF-II
Combustion System Testing and Replacement
Observe burner operation through the sight glass located on the combustion insert mounting flange.
Normal burner operation should ignite smoothly, without evidence of coughing or huffing upon
ignition. The burner flame should be a blue flame near the burner surface in a uniform flame pattern.
Occasional yellow or white streaks are normal.
WARNING
120 volt potential exposure. Isolate the
Continued from
appliance and reconfirm power is
page 20
disconnected using a multi-meter.
Refer to ignition module illustration below,
is there 24VAC between P3(2) and P3(5) (blue and
brown wires) during the flame establishing period?
(Note: Valve LED must be lit during this check)
Replace
ignition module.
(see pg 39)
N
Y
Can you hear or feel
gas valve energize?
Replace Rectifier
harness and/or
gas valve.
(see pg 26)
N
Y
Turn VENTURI set screw clockwise until its
bottomed out. Turn screw counter-clockwise 6-½
turns from bottom (see illustration 16). Note:
EF100T399 models do not have a venturi screw.
The gas regulator setting should be 1 - 1 ¼ turns
out from bottom.
IGNITION MODULE
Clear obstruction
Y
Does burner light
smoothly, without
evidence of coughing
or huffing?
N
N
Check for obstruction
at inlet of gas valve.
Is inlet free of
obstruction?
N
Inspect burner tube,
(see page 25)
16
Venturi
adjustment
Y
Y
Call for technical
support
Does flame LED on the module
light and stay lit?
Y
N
Check flame sensor,
Is there 1 to 5 micro amps
(min.) during 1.5 second
flame proving period?
(see pg 37)
N
Inlet gas
pressure tap
Does burner operate
normaly until thermostat is
satisfied?
N
Y
Gas valve
regulator
Y
System OK
EF100T399
Only
Replace flame sensor
(see page 38)
Page 21
SERVICE PROCEDURE EF-II
Combustion System Testing and Replacement
WARNING
Heater components may be HOT when performing the following steps in this procedure.
Take necessary precaution to prevent personal injury.
Combustion System Removal Procedure
Step 1. Position main power switch to “OFF”.
Step 2. Disconnect (unplug) water heater from
120 volt power source.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 3. Turn off gas supply to water heater.
Step 4. Un-latch and remove surround cover from top of
heater.
Gas valve
wire harness
Step 5. From the gas valve, disconnect the gas
connection, PVC venting, Silicone tubing
and wire harness.
Gas
connection
Step 6. Disconnect wire harnesses from hot surface
igniter, flame sensor and blower.
Burner mounting
screw
(Total of 5)
PVC vent
connection
Burner mounting
insert
Step 7. Remove the 5 screws (½" socket)
holding the burner mounting insert
in place.
Burner tube
Step 8. Carefully remove combustion assembly
with gasket from water heater.
Step 9. See page 23 for combustion system installation procedure.
Burner mounting
insert gasket
Page 22
SERVICE PROCEDURE EF-II
Combustion System Testing and Replacement
Combustion System Replacement Procedure
Step 1. Fully inspect burner mounting insert gasket for the following:
a) Tears
d) Dirt or debris
b) Missing material
e) Other imperfections that would inhibit proper seal
c) Cracks
If gasket is NOT affected by any of the above, gasket replacement is not required.
Step 2. Install combustion assembly using new gasket or fully inspected gasket from step 1.
Secure combustion assembly at the burner mounting insert using screws from step 6
on page 20. Tighten screws evenly.
Step 3. Reconnect wire harnesses to hot surface igniter, flame sensor, blower and gas valve.
Step 4. Reconnect PVC venting, gas supply and silicone tubing to gas valve. Turn on gas
supply to heater and check for gas leaks, repair any gas leaks found.
Step 5. Restore 120 volt power supply to water heater and confirm proper operation following
the lighting instructions on the lighting instruction label or the lighting instruction located
in the installation and operating instruction manual.
Step 6. Replace surround cover on top of
water heater.
Gas valve
wire harness
Gas
connection
Burner mounting
screw
(Total of 5)
PVC vent
connection
Burner mounting
insert
Burner tube
Burner mounting
insert gasket
Page 23
SERVICE PROCEDURE EF-III
Burner Tube Inspection and Replacement
WARNING
Heater components may be HOT when performing the following steps in this procedure.
Take necessary precaution to prevent personal injury.
Burner Tube Removal Procedure
Step 1. Position main power switch to “OFF”.
Step 2. Disconnect (unplug) water heater from
120 volt power source.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 3. Turn off gas supply to water heater.
Step 4. Un-latch & remove surround cover from top of
heater.
Step 5. From the gas valve, disconnect
the gas connection, PVC venting,
wire harness and silicone tubing.
Step 6. Disconnect wire harness from
blower assembly.
Step 7. Remove the two screws holding
each the hot surface igniter and
flame sensor in place (long reach
magnetic Phillips screw driver).
Carefully remove hot surface igniter
and flame sensor from combustion
assembly.
BURNER TRANSITION
MOUNTING NUTS
Step 8. Remove the 4 nuts (7/16" socket) holding
the burner transition in place. Lift the blower/gas
valve transition assembly from burner mounting
insert, remove gasket and set aside.
Step 9. Remove burner tube from burner
mounting insert. See page 25 for
burner tube inspection procedure.
Page 24
SERVICE PROCEDURE EF-III
Burner Tube Inspection and Replacement
WARNING
Heater components may be HOT when performing the following steps in this procedure.
Take necessary precaution to prevent personal injury.
Burner Tube Inspection
Step 1. Inspect burner tube as follows (BSI ceramic fiber mesh burner, water heaters prior to
serial number “CK”) :
a) Visually inspect ceramic fiber mesh, mesh should be uniform in appearance without large
gaps, tears or fraying. Mesh should have uniform pattern allowing for unrestricted gas
flow.
b) Gently squeeze burner tube, Burner tube should feel firm without any soft areas
around the sides or at the bottom.
c) Visually inspect inside burner tube, Burner tube should be intact with no areas of
deterioration. Ports should be free of any debris.
Inspect burner tube as follows (Acotech metal fiber mesh burner, water heaters with
“CK” serial number or later).
a) Outer fiber mesh should be uniform with no tears or deterioration.
Step 2. If burner tube is affected by any of the above, replacement is required. Refer to burner
tube replacement procedure below.
Burner Tube Replacement Procedure
Note: New metal fiber mesh burner (Acotech) is the replacement burner for the BSI ceramic fiber sock
burner. The length of burner will not be the same as the previous BSI burner. Provide the model and
serial number for the correct replacement burner.
Step 1. Fully inspect burner flange gaskets, igniter and flame sensor gaskets for the following:
a) Tears
d) Dirt or debris
b) Missing material
e) Other imperfections that would inhibit proper seal
c) Cracks
If gaskets are NOT affected by any of the above, gasket replacement is not required.
Step 2. Install burner tube with gaskets into burner mounting insert. Be sure gasket surfaces are free
of debris.
Step 3. Reconnect the blower/gas valve/transition assembly to burner mounting insert. Secure using
nuts from step 8 on page 24.
Step 4. Carefully reinstall flame sensor with gasket and hot surface igniter with gasket and secure with
screws from step 7 on page 24. Reconnect wire harnesses to sensor and igniter.
Step 5. Reconnect wire harnesses to blower motor and to gas valve.
Step 6. Reconnect PVC venting, gas supply and silicone tubing to gas valve. Turn on gas to heater
and check for gas leaks, repair any gas leaks found.
Step 7. Restore 120 volt power supply to water heater and confirm proper operation following the
lighting instructions on the lighting instruction label or the lighting instruction located in the
installation and operating instruction manual.
Step 8. Replace surround cover on top of water heater.
Page 25
Service Procedure EF-IV
Gas Valve Replacement
Gas Valve Replacement Procedure
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 1. Position main power switch to “OFF”.
Step 2. Disconnect (unplug) water heater from
120 volt power source.
Step 3. Turn off gas supply to water heater.
Step 4. Un-latch & remove surround cover from top of
heater.
Step 5. From the gas valve, disconnect
the gas connection, PVC venting,
wire harness and silicone tubing.
Step 6. Remove the 2 gas valve mounting screws (Torx bit) located at the
11:00 O-clock & 5:00 O-clock position on the venturi mounting flange
and remove gas valve from water heater.
Step 7. Remove any residual gasket material from blower and venturi mounting flange.
Blower / gas valve
gasket
Gas valve
wire harness
Gas valve
assembly
Gas valve
mounting screws
(2 places)
Blower
Venturi
mounting flange
Venturi inlet
Step 8. Install new gas valve with new gasket provided. Secure gas valve in place using
screws from step 6.
Step 9. Reconnect PVC venting, gas supply, silicone tubing & wire harness to gas valve. Turn
on gas supply to heater and check for gas leaks, repair any gas leaks found.
Step 10. Restore 120 volt power supply to water heater and confirm proper operation following
the lighting instructions on the lighting instruction label or the lighting instruction located
in the installation and operating instruction manual.
Step 11. Replace surround cover on top of
water heater.
Page 26
Service Procedure EF-V
Blower Testing and Replacement
Does blower
energize?
Is there 120VAC
across the white and
black wires at the
terminal block ?
(see photo 17)
Y
Refer to ignition module
illustration.
Is there 120VAC between
P5(1) and P5(3)?
Y
N
N
Replace
ignition module.
(see pg 39)
Y
N
18
17
Determine
power
source
problem
and
correct
Black wire leading to
blower motor looped
through amprobe.
Is there 120VAC
across the white and
black wires at the
terminal block ?
(see photo 17)
Check amp draw through
BLACK wire lead of blower
motor. Is there .6 to 1
amps?
(see photo 18)
N
Y
Is Blower wheel secured to Y
blower motor shaft?
Call technical
support.
N
Y
N
Replace blower.
(see pg 28)
Refer to ignition module
illustration.
Is there 120VAC between
P5(1) and P5(3)?
N
Refer to ignition
module, is there 24
VAC between P3(7)
and ground?
Are safety circuits in normal position?
See Safety Circuit Trace on Page 32
N
Y
Thermostat not
calling for heat.
(see page 14)
Is there 120VAC
across the white and
black wires at the
blower?
(see photo 19)
Y
N
Y
Replace ignition module.
(see pg 39)
N
Correct safety circuit problem per
safety circuit trace
on page 32.
Repair/replace
wire harness.
Y
19
Replace blower.
(see pg 28)
IGNITION MODULE
Page 27
Service Procedure EF-V
Blower Testing and Replacement
Blower Replacement Procedure
Step 1. Position main power switch to “OFF”.
Step 2. Disconnect (unplug) water heater from
120 volt power source.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 3. Turn off gas supply to water heater.
Step 4. Un-latch & remove surround cover from top of
heater.
Step 5. Disconnect wire harness from blower.
Step 6. Disconnect intake vent and gas supply from gas valve assembly.
Step 7. Remove the 2 gas valve mounting screws (Torx bit) located at the
11:00 O-clock & 5:00 O-clock position on the venturi mounting flange.
Step 8. Remove The 4 blower flange mounting screws (5/32 Allen wrench) and remove blower
from transition flange.
Blower
Blower / gas valve
gasket
Gas valve
assembly
Gas valve
mounting screws
2 places.
Blower flange
mounting screws
Blower / transition
gasket
Venturi
mounting flange
Transition
flange
Venturi inlet
Step 9. Remove any residual gasket material
from venturi mounting flange and
transition flange.
Step 10. Install new blower with new gasket
provided. Secure blower in place using
screws from step 8.
Step 11. Reconnect gas valve assembly to blower
Step 12. Reconnect intake vent and
with new gasket provided. Secure gas
gas line to gas valve assembly and
valve in place using screws from step 7.
check for gas leaks repair any leaks found.
Step 13. Reconnect wire harness to blower assembly, restore 120 volt power supply & Gas supply
to water heater and confirm proper operation following the lighting instructions on the
lighting instruction label or the lighting instruction located in the installation and operating
instruction manual.
Step 14. Replace surround cover on top of
water heater.
Page 28
Service Procedure EF-VI
Exhaust Pressure Switch Testing and Replacement
For serial numbers prior to “CF”
Sequence of operation:
With the thermostat calling for heat, prior to energizing blower, the ignition module checks the exhaust pressure switch for normal
switch position of normally open. If the exhaust pressure switch contacts are closed (not in normal position), the ignition module
waits 45 seconds for the pressure switch contacts to open. If the pressure switch contacts do not open after 45 seconds, the
ignition module locks out with the PURGE LED flashing indicating a pressure switch fault.
WARNING
LED Status
Only power LED is on, or
Purge LED flashing.
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.
Safety Circuit Trace
Does blower
energize?
Is there continuity
Through GREY
wire leads of heater side
safety circuit harness?
(see photo 20)
N
Y
Y
Call technical
support.
Does heater
function?
Y
Verify proper
switch operation.
(see pg 43)
Y
N
Safety Circuit OK,
See Blower.
(Page 27)
Y
Replace exhaust
pressure switch
(see Pg 31)
Y
N
N
Is there continuity
through RED
wire leads of heater side
safety circuit harness?
(see photo 20)
Check PURGE LED status
on ignition module,
Flashing after 45 seconds?
Depress reset
button on vent
safety switch. Is
there continuity
across high limit
switch?
(see photo 21)
Control side
harness
Heater side
harness
20
N
Replace vent
safety switch.
(see pg 44)
Check PURGE LED status.
On within 5 minutes?
Y
Pressure switch is OK.
N
Flashing after
5 minutes?
21
Call for technical
support.
N
Y
Check blower for proper
operation (see page 27)
Is blower OK?
N
Correct blower problem
(see page 27)
Y
Reset button
Refer to
“Check Collector Pressure”
(see Pg 29)
Page 29
Service Procedure EF-VI
Exhaust Pressure Switch Testing and Replacement
For serial numbers prior to “CF”
Check Collector Pressure
Check exhaust collector pressure at the exhaust
collector pressure tap location (see illustration below). Is
there positive pressure equal to or greater than
pressure switch settings below?
EXHAUST PRESSURE SWITCH SETTINGS
EF(60,100)T199
+2.58" W.C.
EF100T150
+1.50" W.C.(see note 1)
EF60T150,EF100T250
+1.22" W.C.
EF60T125
+2.08" W.C.
EF100T300
+0.55" W.C.(see note 2)
Y
With monometer, take a
reading at the exhaust
tube pressure tap location. N
Is value negative (-)?
(see illustration below).
Is exhaust venting
system blocked or
obstructed?
Y
Clear obstruction.
Determine cause
and correct.
N
Y
Is vent system total
length compliant with
vent tables in the
instruction manual?
Note 1: +5.6" W.C. on serials prior to AH5039107
Note 2: +0.8" W.C. on serials prior to AK5288269
N
N
Reconfigure vent
system to be
compliant with
vent tables on
page 7.
Y
Replace
exhaust pressure switch.
(see pg 31)
Inspect the area housing the combustion
system and control panel located at the
Y
top of the heater.
Does the area show signs of corrosion
and/or exssesive heat?
Call for
technical support
N
Remove combustion assembly
(see pg 22)
Y
Inspect combustion chamber
for blockage or debris
accumulation
Clear obstruction.
Determine cause
and correct.
N
Call for
technical support
Exhaust collector
pressure tap location
Exhaust Tube
pressure tap location
Exhaust tube
at bottom of water
heater
Page 30
Service Procedure EF-VI
Exhaust Pressure Switch Testing and Replacement
For serial numbers prior to “CF”
Exhaust Pressure Switch Replacement Procedure
Step 1. Position main power switch to “OFF” position.
Step 2. Loosen adhesive backed rubber escutcheon from service panel access cover
and slide escutcheon back along exhaust pipe to allow for removal of cover.
Step 3. Remove screws from service panel access cover
(¼" nut driver) and remove cover from heater.
(see photo 22)
22
Rubber
escutcheon
Step 4. Disconnect silicone tubing and wire leads from
pressure switch. (see photo 23)
Step 5. Remove pressure switch mounting screws
(5/16" wrench) and remove pressure switch.
Step 6. Assemble new pressure switch to heater using
screws from step 5.
23
Pressure switch
mounting screw
5/16 hex head
Wire leads
Step 7. Reconnect wire leads. Note: wire leads are
interchangeable with either terminal.
Step 8.
Reconnect silicone tubing to pressure switch
as follows:
a) Exhaust pipe tubing connects to
negative (-) side of switch
identified by the (-) symbol
located on switch.
Example of switch
showing positive
side identifier
b) Exhaust collector tubing connects
to positive (+) side of switch
identified by the (+) symbol located
on the switch.
Silicone tubing
Exhaust collector
pressure tap location
(serial numbers prior
to “CF”)
Exhaust pipe
pressure tap location
Step 9. Restore 120 volt power supply to water heater
and confirm proper operation following the
lighting instructions on the lighting instruction
label or the lighting instruction located in the installation
and operating instruction manual.
Step 10. Reinstall service panel access cover and
rubber escutcheon.
Page 31
Service Procedure EF-VI
Blocked Vent Pressure Switch Testing and
Replacement for serial number “CF” and later
Sequence of operation:
The blocked vent pressure switch monitors the pressure in the exhaust tube. The switch contacts are normally closed and will
not open unless there is a blockage in the exhaust venting or terminal (snow, ice, debris). If the blocked vent pressure switch
contacts open after the thermostat initiates the blower, the blower will remain on for to 5 minutes waiting for the contacts to close.
If the contacts remain open, the blower will stop and the PURGE LED will flash.
WARNING
LED Status
Only power LED is on, or
Purge LED flashing.
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.
Safety Circuit Trace
Does blower
energize?
Is there continuity
Through GREY
Y
wire leads of heater side
safety circuit harness?
(see photo 24)
N
Y
Call technical
support.
N
Y
Verify proper
switch operation.
(see pg 43)
Y
Y
Safety Circuit OK,
See Blower.
(Page 29)
N
N
Does heater
function?
Is there continuity
through RED
wire leads of heater side
safety circuit harness?
(see photo 24)
Check PURGE LED status
on ignition module,
Flashing after 5 minutes?
Depress reset
button on vent
safety switch. Is
there continuity
across high limit
switch?
(see photo 25)
Control side
harness
Replace exhaust
pressure switch
(see Pg 34)
Heater side
harness
24
N
Replace vent
safety switch.
(see pg 44)
Check PURGE LED status.
On within 5 minutes?
Y
Pressure switch is OK.
N
Call for technical
support.
N
Flashing after
5 minutes?
25
Y
Check blower for proper
operation (see page 27)
Is blower OK?
N
Correct blower problem
(see page 27)
Y
Refer to
“Check Collector Pressure”
(see Pg 33)
Note: The blocked vent pressure switch must
be used with the revised ignition control,
identified with a yellow label.
Reset button
Page 32
Service Procedure EF-VI
Blocked Vent Pressure Switch Testing and
Replacement for serial number “CF” and later
Check Exhaust Tube Pressure
With monometer, take a
reading at the exhaust
tube pressure tap location. N
Is value negative (-) or
slightly postitive
(see illustration below).
Y
Is exhaust venting
system blocked or
obstructed? Also
check condensate
elbow and drain.
Y
Clear obstruction.
Determine cause
and correct.
N
Is vent system total
length compliant with
vent tables in the
instruction manual?
N
Reconfigure vent
system to be
compliant with
vent tables on
page 7.
Y
Replace
blocked vent switch.
(see pg 34)
With ohmmeter check
N
pressure switch for
continuity. Contacts should
be closed.
Y
Pressure switch O.K.
Exhaust Tube
pressure tap location
Exhaust tube
at bottom of heater
Page 33
Service Procedure EF-VI
Blocked vent Switch Testing and Replacement
For serial number “CF” or later
Exhaust Pressure Switch Replacement Procedure
Step 1. Position main power switch to “OFF” position.
Step 2. Loosen adhesive backed rubber escutcheon from service panel access cover
and slide escutcheon back along exhaust pipe to allow for removal of cover.
Step 3. Remove screws from service panel access cover
(¼" nut driver) and remove cover from heater.
(see photo 26)
26
Rubber
escutcheon
Step 4. Disconnect silicone tubing and wire leads from
pressure switch. (see photo 27)
Step 5. Remove pressure switch mounting screws
(5/16" wrench) and remove pressure switch.
Step 6. Assemble new pressure switch to heater using
screws from step 5.
27
Pressure switch
mounting screw
5/16 hex head
Wire leads
Step 7. Reconnect wire leads. Note: wire leads are
interchangeable with either terminal.
Step 8.
Reconnect silicone tubing to pressure switch
as follows:
Silicone tubing
a) Exhaust pipe tubing connects to
single tap located on switch
Step 9. Restore 120 volt power supply to water heater
and confirm proper operation following the
lighting instructions on the lighting instruction
label or the lighting instruction located in the installation
and operating instruction manual.
Exhaust Tube
pressure tap location
Step 10. Reinstall service panel access cover and
rubber escutcheon.
Page 34
Service Procedure EF-VII
Hot Surface IgniterTesting and Replacement
Hot surface Igniter Testing Procedure
WARNING
120 volt potential exposure. Use caution
making voltage checks to avoid
personal injury. Igniter may be too hot
to handle, take necessary precautions
Is igniter resistance
less than 150 Ohms
(cold)?
(see “check igniter
resistance” below)
Y
Refer to ignition module illustration below,
is there 120VAC across terminals
P6(1) and P6(2)?
Y
(Check during igniter warm up period,
indicated by the igniter LED glowing on the
ignition module).
N
Replace
hot surface igniter
(see pg 36)
Check harness
connection from igniter
to ignition module.
N
Replace ignition module.
(see pg 39)
Volt meter set to
OHM setting
Meter probe
Hot surface
igniter
CHECK IGNITER
RESISTANCE
IGNITION MODULE
Page 35
Service Procedure EF-VII
Hot Surface IgniterTesting and Replacement
Hot surface Igniter Replacement Procedure
Step 1. Position main power switch to “OFF”
Step 2. Disconnect (unplug) water heater
from 120 volt power source.
Step 3. Un-latch & remove surround cover
from top of heater.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 4. Fold back insulation in front of combustion assembly to expose hot surface igniter.
(see photo 28)
Step 5. Disconnect igniter wire leads from heater harness.
28
Step 6. Remove the 2 igniter mounting screws (magnetic
tip, long reach Phillips screw driver) and remove
igniter and gasket from transition base flange.
Step 7. Remove any residual gasket material from
transition base flange.
Note:
Note:
New replacement igniter will
not have a shield over element. Do not handle igniter element
or allow foreign material to
Handle carefully to prevent
come in contact with element.
breakage.
Hot Surface
Igniter
Step 8. Install new igniter with new gasket provided using
screws from step 5. Arrange igniter flange with offcenter hole towards front of heater.
Off-center
mounting hole
Heater front
Step 9. Reconnect igniter wire harness.
Igniter mounting
screws
Transition
base flange
Igniter flange
Igniter gasket
Igniter filament
Step 10. Fold insulation back into place. Be sure no wires are in contact with burner flange.
Step 11. Restore 120 volt power supply to water heater and confirm proper operation following the
lighting instructions on the lighting instruction label or the lighting instruction located in
the installation and operating instruction manual.
Step 12. Replace surround cover on top of
water heater.
Page 36
Service Procedure EF-VIII
Flame Sensor Testing and Replacement
Flame Sensor Testing Procedure
WARNING
120 volt potential exposure. Use caution
making voltage checks to avoid
personal injury. Flame sensor may be
too hot to handle, take necessary
precautions
Refer to illustration below, is there
a minimum of 1 micro amp during
1.5 second flame proving period?
Refer to ignition module illustration below. Is
there 24 volts AC at locations P3(2) & P3(5)?
24 volts should maintain beyond the 1.5
second flame proving period.
Y
N
Y
Flame sensing circuit OK
N
With flame sensor Disconnected
from ignition module, check
continuity to ground.
Is there continuity to ground?
Replace flame sensor
with gasket
and/or wire lead.
(see pg 38)
Y
Call for
technical support
N
Remove flame sensor from heater.
Check continuity from tip of flame
sensor to end of wire lead.
Is there continuity?
N
Y
Is flame sensor free
of oxidation?
N
Clean or replace
flame sensor.
(see pg 38)
Y
Is ceramic of flame
sensor cracked?
N
Y
Replace flame sensor.
(see pg 38)
Volt meter set to
Micro amps setting
(µA)
Meter probe
Flame sensor
terminal
Flame sensor
terminal on
ignition module.
Meter probe
Page 37
Service Procedure EF-VIII
Flame Sensor Testing and Replacement
Flame Sensor Replacement Procedure
Step 1. Position main power switch to “OFF”
Step 2. Disconnect (unplug) water heater
from 120 volt power source.
Step 3. Un-latch & remove surround cover
from top of heater.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 4. Fold back insulation in front of combustion assembly to expose flame sensor.
(see photo 29)
Step 5. Disconnect wire lead from flame sensor.
29
Step 6. Remove the 2 sensor mounting screws (magnetic
tip, long reach Phillips screw driver) and remove
flame sensor & gasket from transition base
flange.
Step 7. Remove any residual gasket material from
transition base flange.
Flame
sensor
Step 8. Install new flame sensor with new gasket provided
using screws from step 6. Arrange flame sensor with
hook towards burner.
Flame sensor
mounting screws
Flame sensor
Flame sensor
gasket
Arrange hook
of sensor
towards burner
Step 9. Reconnect flame sensor wire.
Transition
base flange
Step 10. Fold insulation back into place. Be sure no wires are in
contact with burner flange.
Step 11. Restore 120 volt power supply to water heater and confirm proper operation following the
lighting instructions on the lighting instruction label or the lighting instruction located in
the installation and operating instruction manual.
Step 12. Replace surround cover on top of
water heater.
Page 38
Service Procedure EF-IX
Ignition Module Replacement
Ignition Module Replacement Procedure
Step 1. Position main power switch to “OFF”.
Step 2. Disconnect (Unplug) water heater
from 120 Volt power source.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 3. Un-latch & remove surround cover from top of water heater.
Step 4. Locate Ignition module on control panel inside surround area.
(see photo 30)
30
Ignition Module
located on control panel
Note: Replacement
module works on all EF
models prior to and later
than “CF” serial numbers
Step 5. Carefully disconnect all wire harness connection to ignition module. Connection are
non-interchangeable to insure proper reinstallation.
Step 6. Remove the 3 screws (Phillips screw driver) holding the ignition module in place and
remove ignition module from control panel.
Step 7. Install new ignition module and secure in place with screws from step 6.
Step 8. Carefully reconnect all wire harness connection to ignition module. Connection are
non-interchangeable to insure proper reinstallation.
Step 9. Restore 120 volt power supply to water heater and confirm proper operation following the
lighting instructions on the lighting instruction label or the lighting instruction located in
the installation and operating instruction manual.
Step 10. Replace surround cover on top of water heater.
Page 39
Service Procedure EF-X
Transformer Replacement
Transformer Replacement Procedure
Step 1. Position main power switch to “OFF”.
Step 2. Disconnect (Unplug) water heater
from 120 Volt power source.
Step 3. Un-latch & remove surround cover from
top of water heater.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 4. Refer to ignition module illustration below, Disconnect wire harness P1 labeled
“PRIMARY” and P2 labeled “SECONDARY” from ignition module.
Step 3
Disconnect harness
“P1” & “P2”
from ignition module
Step 5. Disconnect secondary leads (blue &
yellow wire) from thermostat board.
Note the blue wire is connected to
24 volt “HOT” terminal. (see photo 31)
Step 5
Disconnect blue & yellow wire from
thermostat board. Note blue wire is
connected to 24 volt “HOT” terminal.
31
Thermostat
board
Ignition module
Step 6. Remove the 2 screws ( short Phillips screw driver) holding the transformer in place and
remove transformer from control panel. (see photo 32)
Step 7. Install new transformer and secure in
place with screws from step 6.
Step 8. Reconnect wire harness P1 & P2,
connections are non-interchangeable
to insure proper reconnection.
Step 6
Remove transformer
mounting screws
Step 9. Reconnect blue & yellow wire leading from the
P2 connection on ignition module to
thermostat board. Note the blue wire must
connect to the 24 volt “HOT” terminal.
(see photo 33)
Step 10. Restore 120 volt power supply to water heater and
confirm proper operation following the lighting
instructions on the lighting instruction label or the
lighting instruction located in the installation and
operating instruction manual.
33
32
Thermostat
board
24 volt common,
yellow wire connection
24 volt Hot,
blue wire connection
Step 11. Replace surround cover on top of water heater.
Page 40
Service Procedure EF-XI
Intake Pressure Switch Testing and Replacement
Used on EF water heaters prior to “CF” serial number.
Notice:
The intake pressure switch is not used
on serial number “CF” and later.
Does Blower Energize?
Is there continuity
through the normally
N
closed intake pressure
switch?
(see photo 31)
N
WARNING
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.
Replace
intake pressure switch.
(see pg 42)
Y
Y
34
See Vent Safety Switch (page 43)
or
Exhaust Pressure switch (page 31)
or
Blower testing (page 27)
Does purge LED
illuminate on the ignition
module?
Y
Switch OK.
Disconnect red wire leads from
pressure switch and check
continuity through switch.
N
With manometer, take a
reading from the inlet tube
pressure tap. Is reading N
negative (-)1.2" W.C.
or more?
(see illustration below)
Is there continuity
through the normally
Y
closed intake pressure
switch?
(see photo 34)
N
Y
Remove hose from intake
pressure switch and
Restart heater.
Does purge LED illuminate?
Y
See Exhaust Pressure switch (page 31)
or
Blower testing (page 27)
N
Isolate (disconnect) heater from
intake vent system and
Restart heater.
Does purge LED illuminate?
N
Y
Is intake vent system
obstructed?
Y
Clear obstruction.
Inlet Tube
pressure tap
N
Call for technical support.
Page 41
Service Procedure EF-XI
Intake Pressure Switch Testing and Replacement
Used on EF water heaters prior to “CF” serial number.
Intake Pressure Switch Replacement Procedure
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 1. Position main power switch to “OFF”.
Step 2. Disconnect (Unplug) water heater
from 120 Volt power source.
Step 3. Un-latch & remove surround cover from top of water heater.
Step 4. Locate intake pressure switch on control panel inside surround area (see photo 35).
35
Intake pressure switch
located on side of
control panel
Step 6
Disconnect tubing from
pressure switch
36
Step 5. Disconnect red wire leads from pressure switch
(see photo 36).
Step 7
Remove 2
mounting screws
Step 5
Disconnect red wires
Step 6. Disconnect silicone tubing from pressure switch (see photo 36).
Step 7. Remove the two screws (Phillips screw driver) holding the intake pressure switch in
place and remove pressure switch from control panel (see photo 36).
Step 8. Install new pressure switch and secure in place with screws from step 7.
Step 9. Reconnect silicone tubing (from step 6) to pressure switch.
Step 10. Reconnect red wires (from step 5) to pressure switch. Note: wires are interchangeable
with either switch terminal.
Step 11. Restore 120 volt power supply to heater & verify proper heater operation following the
instructions on the lighting instruction label or the lighting instructions located in the
installation & operation manual.
Step 12. Replace surround cover on top of heater.
Page 42
Service Procedure EF-XII
Vent Safety Switch Testing and Replacement
Sequence of operation:
With the thermostat calling for heat, prior to energizing blower, the ignition module checks the vent safety switch for normal
switch position of normally closed. If the vent safety switch contacts are open, (not in normal position), the ignition module waits
indefinitely for contact to close, The vent safety switch must be manually reset to close the switch contacts.
WARNING
120 volt potential exposure. Use caution
making voltage checks to avoid personal injury.
Control side
harness
Heater side
harness
37
Is there continuity
Through GREY
Y
Lead wires of heater side
harness?
(see photo 37)
Locate harness
connection.
(see photo 37)
N
Call technical
support.
N
Does heater
function?
Y
Y
Depress reset
button on high
limit switch. Is
there continuity
across high limit
switch?
(see photo 38)
N
Replace vent
safety switch
(see pg 44)
System OK
N
Reset heater, observe
heating cycle. Does
switch open?
N
Is temp over 350°F?
Y
Y
38
Does switch open prior
to 350°F?
Y
N
DO NOT OPERATE
HEATER
System over heating,
immediately contact
technical support.
Replace vent
safety switch
(see pg 44)
Reset button
Page 43
Service Procedure EF-XII
Vent Safety Switch Testing and Replacement
Vent Safety Switch Replacement Procedure
Step 1. Position main power switch to “OFF”.
Step 2. Loosen adhesive backed rubber escutcheon from service panel access cover
and slide escutcheon back along exhaust pipe to allow for removal of cover
(see photo 38).
Rubber
escutcheon
Step 3. Remove screws from service panel access cover
(¼" nut driver) and remove cover from heater
(see photo 38)
Step 4. Disconnect wire leads from vent
safety switch (see photo 39).
38
39
Step 5. Remove the 2 switch mounting
screws (Phillips screw driver)
and nuts (5/16 wrench) and
remove switch from heater.
Step 6. Install new switch using screws
from step 5.
Step 7. Reconnect wire leads.
Note: wire leads are
interchangeable with either
switch terminal.
Vent safety
switch
Step 8. Restore 120 volt power supply to water heater and confirm proper operation following
the lighting instructions on the lighting instruction label or the lighting instruction located
in the installation and operating instruction manual.
Step 9. Reinstall service panel access cover and
rubber escutcheon.
Page 44
Service Procedure EF-XIII
Anode/Flue Baffle Inspection and Replacement
Disassembly Procedure for Access to Anodes & Flue Baffles
WARNING
Heater components may be HOT when performing the following steps in this procedure.
Take necessary precaution to prevent personal injury.
Step 1. Position main power switch to “OFF”.
Step 2. Disconnect (Unplug) water heater
from 120 Volt power source.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 3. Un-latch & remove surround cover from top of heater.
Step 4. Disconnect wire harnesses to allow for removal of control panel.
Note: Where ever possible, rather than disconnecting at the control panel, follow wire
harness away from control panel and disconnect at control component location.
Step 5. Remove the three control panel mounting screws (¼” nut driver) and remove control
panel from appliance (see photos 40 & 41).
40
41
Step 6. Completely remove insulation (two pieces) from top of heater to expose collector cover
Step 7. Remove all collector cover
screws (5/16" socket) and
remove collector cover
(see photos 42 & 43).
42
43
Collector
cover
Step 8. Photo 44 shows heater with collector cover removed allowing
access to anode rods and flue baffles.
a) for anode service, see page 46
b) for flue baffle service, see page 47
c) for powered anode service, see page 48
Note: EF100T399 models have only 1 anode
rod under the 2nd pass collector cover.
44
Anode
locations
Flue
baffles
Page 45
Service Procedure EF-XIII
Anode/Flue Baffle Inspection and Replacement
(see page 47 for replacement)
Anode inspection and replacement
WARNING
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. Turn off water supply and drain water heater.
Step 2. Disassemble heater per disassembly procedure on page 45.
Step 3. Locate and remove anode rods from heater (1-1/16 hex socket).
Step 4. Visually inspect anode rod. Anode rod should show signs of depletion, this is normal. If
the depletion is ½ of the original diameter (approximately ¾" diameter), replacement is
recommended. If any of the steel core of the anode is exposed, replacement is
recommended.
Step 5. Upon completion of inspection or subsequent replacement, apply Teflon tape or other
thread compound to threads of anode and reinstall into heater. Restore water supply
and check for and repair any leaks found.
Step 6. Reinstall collector cover per procedure on page 49.
Step 7. Reinstall collector insulation and control panel, reconnect control panel wire harnesses.
Step 8. Restore 120 volts to water heater and verify proper heater operation following the
instructions on the lighting instruction label or the lighting instruction located in the
installation and operating instruction manual.
Step 9. Replace surround cover on top of water heater.
Page 46
Service Procedure EF-XIII
Anode/Flue Baffle Inspection and Replacement
Flue baffle inspection and replacement
WARNING
Heater components may be HOT when performing the following steps in this procedure.
Take necessary precaution to prevent personal injury.
Step 1. Disassemble heater per disassembly procedure on page 45.
Step 2. Remove flue baffles from heater (pliers) (8 two inch baffles & 2 four inch baffles).
Step 3. Visually inspect flue baffles. Flue baffles should show signs of oxidation, this is normal.
If the oxidation has deteriorated any portion of the flue baffle, replacement is
recommended. If any restrictors are missing, replacement is recommended.
Step 4. Upon completion of inspection or subsequent replacement, reinstall flue baffles into
heater.
Step 5. Reinstall collector cover per procedure on page 49.
Step 6. Reinstall collector insulation and control panel, reconnect control panel wire harnesses.
Step 7. Restore 120 volts to water heater and verify proper heater operation following the
instructions on the lighting instruction label or the lighting instruction located in the
installation and operating instruction manual.
Step 8. Replace surround cover on top of water heater.
Page 47
Service Procedure EF-XIII
Powered Anode Replacement for EF100T399 only
Powered Anode Replacement EF100T399 models only
WARNING
Heater components may be HOT when performing the following steps in this procedure.
Take necessary precaution to prevent personal injury.
The powered anode control module is located on the right vertical side of the control panel inside
the surround panel. The control has a LED indicator light to show the status of operation. When the
tank is filled with water and the power supply is on to the water heater, the light should have a
steady green glow to indicate that protection current is flowing and operating normally. If the
indicator light is not glowing, the power supply to the water heater or powered anode system is
disconnected.
Step 1. Check the power supply or wire connections to the powered anode control.
Step 2. Indicator light diagnostic codes:
a) If the control is flashing red, then there is a malfunction with the powered anode system.
Make sure there are no bare spots in the wire insulation to the powered
anode rods.
Step 3. Check all electrical connections. The powered anode rods are insulated from the
water heater tank in the bushing.
a) With an ohmeter, check continuity between the powered anode terminal and the
bushing. There should not be continuity. If there is continuity, replace the powered
anode assembly.
Volt meter set
to OHM setting
Page 48
Service Procedure EF-XIII
Anode/Flue Baffle Inspection and Replacement
Collector Cover Installation Procedure
Step 1. Remove old silicone from top surface of collector flange and collector cover.
Step 2. Apply ¼" bead of Ultra Copper Silicone around entire collector flange surface. Allow
caulk to “cure” for 10 minutes.
Step 3. Carefully reinstall collector cover, tighten screws evenly.
Step 4. Allow a minimum of 6 hours before putting heater back in service.
Apply ¼" bead of Ultra
Copper Silicone around entire
collector flange surface
Page 49
eF Series Heater
Installation Check List
R
Product Handling - Carefully uncrate the heater. Move in place with a hand truck (Do not use
the venting pipes for handles).
Electrical Requirements - Make sure there is 120 volts line voltage. Line voltage must be
properly polarized. Adequate ground supplied to the heater.
Venting Requirements - All venting must stay within the required lengths and diameter (see
table below). Proper support of the venting pipe is a MUST (every 5ft vertical and 3ft horizontal).
Termination must be located to prevent re-circulation of flue gases. Medium to long sweep 90°
elbows or straight exhaust terminal coupling recommended.
Gas Requirements - Gas piping sized adequately, ¾" or larger to heater or 1" or larger for
EF100T399 models. Install a properly sized regulator (if unknown, assure an adequate volume of
gas is available). 7" W.C. is required when the unit is running. Gas pressure must stay below 14"
W.C. static pressure. Pressure drops between static pressure and operating flow should be less
than 3" W.C.
Condensate Requirements - Condensate line needs to slope to a drain at a minimum of ¼"
per foot. Make sure the condensate line does not have the potential to freeze. If using more than
one heater and using a common condensate line, make sure the condensate line is properly sized.
Service/Mechanical Room - Provide adequate space for servicing heater. Leave room to get
to the top and bottom pressure switches as well as enough overhead room to remove the anode
rods for servicing (18" min.).
Vent tables
Balanced Direct Vent Systems
PVC, CPVC or ABS
Power Vented Systems
PVC, CPVC or ABS
Total length of intake piping and exhaust
piping added together must not exceed
“Maximum Combined Length”
Shown below
Total length of exhaust piping must not
exceed “Maximum Vent Length”
Shown below
Maximum Combined Length (feet)
Maximum Vent Length (feet)
Model Number
3"
4"
Model Number
3"
4"
EF60T125, EF100T150
120'
170'
EF60T125, EF100T150
120'
170'
EF60T150, EF100T199
100'
150'
EF60T150, EF100T199
100'
150'
EF60T199, EF100T250
80'
130'
EF60T199, EF100T250
80'
130'
EF100T300
60'
110'
EF100T300
60'
110'
EF100T399
50'
100'
EF100T399
50'
100'
Unbalanced Direct Vent Systems
Air intake CAN NOT exceed exhaust by
more than 30 feet
Note: each 3" & 4" 90° Elbow is equivalent to 5 feet of straight pipe.
Note: each 3" & 4" 45° Elbow is equivalent to 2.5 feet of straight pipe.
Page 50
R
eF Series Heater
Service Report
Date
Service Provider
Model Number
Phone Number
Serial Number
Venting (PVC, CPVC,ABS):
Vent size 3" or 4"
Intake 90's (qty)
Intake 45's (qty)
Length of straight
pipe (intake)
Exhaust 90's (qty)
Exhaust 45's (qty)
Length of straight
pipe (exhaust)
Gas Line:
Gas Pressure:
Venturi:
Size & material
Static
Setting from Bottom in Turns
Distance from meter
to water heater
Running Inlet
Manifold
Electrical:
Line Voltage
Low Voltage
Igniter Resistance:
Flame Sense Micro -Amps:
LED Flashing Y or N
Polarity
Which One(s)
Exhaust Collector
Pressure:
Condensate Line:
Size & Material
Length
Positive Inches W.C.
Is trap provided Y or N
Combustion:
CO2
Installation Site Name & Address:
CO
Installation Site Contact Name &
Phone Number
Page 51
Parts List
Models prior to “CF” serial number
1
Combustion surround assy.
2
3
4
5
Burner assy
2nd pass top collector cover
Screw 10-16 x 3/4
Vent termination elbow
6
7
8
9
10
11
12
13
Thermostat sensor probe
Baffle 4" flue
Mag rod
Baffle 2" flue
Wire harness service panel
Plastisert nipple 1-½" NPT
Plug
Nipple
14
15
16
17
T&P relief valve
Exhaust pipe (PVC) w/Hose barb
Condensate trap elbow
Silicone hose
18
19
20
21
Outer door service panel
Vent pipe support bracket
NSF Escutcheon
Exhaust pressure switch
22
23
24
25
26
27
28
29
30
31
32
Nut
Vent safety switch
Screw 6-32x 3/8
Cleanout access cover
Cleanout gasket
Screw 5/16-18 x ¾ HH grade 5
Cleanout cover
Cold water inlet
No handle brass drain valve
Coaxial vent system
ASSE approved mixing valve
Customer must specify complete
model number and serial number
when ordering service parts.
Page 52
AA
Latch assy
BB
CC
DD
EE
Screw 8-32 x ½ RHCR
Ignition control assy
Jacket Head
Main power switch
FF
GG
JJ
Potentiometer
Combustion surround
Surround base
Customer must specify complete
model number and serial number
when ordering service parts.
1A
Combustion surround assy.
2A
3A
4A
5A
Blower gas valve assy
Burner assy
Blower EBM
Silicone hose
6A
7A
8A
9A
10A
11A
12A
13A
14A
15A
16A
17A
18A
19A
20A
21A
22A
23A
24A
25A
26A
27A
Hose tee fitting
Screw 10-32 x3/4
Gasket & screw
Gas valve
Nipple ½" NPT X3"
Reducer ¾ x ½ NPT
Nipple ¾ NPT x 6"
2" dia. Flex reducer
Inlet (PVC)
Gasket blower transition
Screw 8-32 x ¼ RHCR
Gasket flame sensor
Flame sensor
Transition tube
Nut hex washer
Gasket hot surface igniter
Hot surface igniter
Burner mounting gasket
Burner tube
Burner mounting gasket
Burner mounting insert
Burner mounting insert gasket
Page 53
1C
2C
3C
Electronic control module
Screw 8-32 x 1/2
Intake pressure switch
4C
5C
6C
7C
8C
9C
10C
11C
12C
13C
14C
15C
16C
Control mounting panel
Thermostat PC board
Transformer 120VAC x 24VAC x 40VA
Terminal
Terminal strip
Power cord
Control wire harness
Thermostat wire harness
Igniter extension wire
Blower wire harness
Power switch wire harness
Flame sensor wire harness
Rectifier harness
Customer must specify complete
model number and serial number
when ordering service parts.
Page 54
Parts List
For models with “CF” serial or later.
1
Combustion surround assy.
2
3
4
5
Burner assy (specify model)
2nd pass top collector cover
Screw 10-16 x 3/4
Vent termination elbow
6
7
8a
8b
9
10
11
12
Thermostat sensor probe
Baffle 4" flue (specify model)
Anode rod assy
Powered anode (for EF100T399)
Baffle 2" flue
Wire harness service panel
Plastisert nipple 1-½" NPT
Plug
13
14
20
Nipple
T&P relief valve
Exhaust pipe (PVC) w/Hose barb
(except EF100T399)
Condensate trap elbow (specify model)
Silicone hose
Outer door service panel (specify model)
Vent pipe support bracket (except
EF100T399)
NSF Escutcheon
21
22
23
24
25
26
27
28
29
30
31
32
Exhaust pressure switch
Nuts
Collector temperature limit switch
Screw 6-32x 3/8
Cleanout access cover
Cleanout gasket
Screw 5/16-18 x ¾ HH grade 5
Cleanout cover
Cold water inlet (hydrojet) ass’y.
No handle brass drain valve
Concentric vent system (optional)
ASSE approved mixing valve (optional)
15
16
17
18
19
Customer must specify complete
model number and serial number
when ordering service parts.
Page 55
Parts List
For models with “CF” serial or later.
AA
Latch assy
BB
CC
DD
EE
FF
GG
JJ
Screw 8-32 x ½ RHCR
Ignition control assy
Jacket Head
Main power switch
Potentiometer
Combustion surround
Surround base
Customer must specify complete
model number and serial number
when ordering service parts.
1A
2A
3A
4A
5A
6A
7A
8A
9A
10A
11A
12A
13A
14A
15A
16A
17A
18A
19A
20A
21A
22A
23A
24A
25A
26A
Combustion surround assy. (specify
model)
Blower gas valve assy (specify model)
Burner assy (specify model)
Blower EBM (specify model)
Silicone hose
Burner mounting insert gasket
Screw 10-32 x3/4
Gasket & screw
Gas valve (specify model)
Nipple (specify model)
Reducer (specify model)
Nipple (specify model)
2" dia. Flex reducer (or PVC reducer for
399)
Inlet (PVC)
Gasket blower transition (specify model)
Screw 8-32 x ¼ RHCR
Gasket flame sensor
Flame sensor
Transition tube
Nut hex washer
Gasket hot surface igniter
Hot surface igniter
Burner mounting gasket
Burner tube
Burner mounting gasket
Burner mounting insert
Page 56
Parts List
For models with “CF” serial or later.
1C
2C
3C
4C
5C
6C
7C
8C
9C
10C
11C
12C
13C
14C
15C
16C
17C
Electronic control module
Screw 8-32 x 1/2
Control mounting panel
Thermostat PC board
Transformer 120VAC x 24VAC x 40VA
Terminal
Terminal strip
Power cord
Control wire harness
Thermostat wire harness
Rectifier harness (specify model)
Blower wire harness (specify model)
Power switch wire harness
Flame sensor wire harness
Powered Anode Control Harness (399 only)
Powered Anode Harness (399 only)
Powered Anode Control (399 only)
Customer must specify complete
model number and serial number
when ordering service parts.
Page 57
Glossary of Terms
AC
BTU/H
CO
CO2
DC
ECO
GFI
GPM
HSI
Hz
LED
NOx
NPT
PSI
RPM
VA
VAC
W.C.
°C
°F
µA
Alternating Current
British Thermal Units
Carbon Monoxide
Carbon Dioxide
Direct Current
Energy Cut Off
Ground fault interrupt
Gallons per Minute
Hot Surface Igniter
Hertz
Light Emitting Diode
Oxides of Nitrogen
National Pipe Thread
Pounds per Square Inch
Revolutions per Minute
Volt Amps
Volts Alternating Current
Inches of Water Column
Degrees Centigrade
Degrees Fahrenheit
Micro Amp
NOTES
Page 58
Notes
NOTES
Page 59