Bradford-White EF100T199(E)'(N User Manual

Size:
8.02 Mb
Download

U a High Efficiency W r Heaters

S ICE MANUAL

T eshooting Guide a structions for Service

(To be performed ONLY by qua ce providers)

M Covered

by This Manual:

For The Bradford White

eF Series® Ultra High Effeciency

Models:

EFR160

EF60T1

EF60T1

EF60T199(E)*(N,X)(A)(2)

EF100T150(E)*(N,X)(A)(2)

EF100T199(E)*(N,X)(A)(2)

EF100T

EF100T

EF100T

(*) Denotes Warra y Years

M

l 238-45817-00F

Save this manual for future reference

The Bradford White

Page

 

eF Service Procedure

Introduction

 

3

- - -

How to use this manual

4

- - -

Tool required for service

4

- - -

Features

5

- - -

Specifications

6

- - -

Sequence of Operation

10

- - -

Troubleshooting

16

- - -

Thermostat Circuit, Testing & Replacement

35

I

Combustion System Testing and Replacement

43

II

Burner Tube Inspection & Replacement

49

III

Gas Valve Replacement

51

IV

Blower Testing and Replacement

52

V

Exhaust Pressure Switch Testing and Replacement

54

VI

Hot Surface Igniter Testing and Replacement

60

VII

Flame Sensor Testing and Replacement

62

VIII

Spark Rod Gap Adjustment and Replacement

64

IX

Ignition Module/Control Board Replacement

66

X

Transformer Replacement

68

XI

Intake Pressure Testing and Replacement

69

XII

Vent Safety Switch Testing and Replacement

71

XIII

Anode & Flue Baffle Inspection and Replacement

73

XIV

Installation Check List

78

- - -

Heater Service Report

79

- - -

Parts List

80

- - -

Glossary of Terms

89

- - -

2

2

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.

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.

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/spark rod 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 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.

3

3

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.

An “Installation Check List” is shown towards the end of this manual. Compare the installation against the installation check list to confirm all requirements are met.

An “eF Service Report” is shown towards the end of this manual. 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” 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.

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-ampsand 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 1-1/16deep well

 

socket, wire cutters, wire strippers, wire crimpers, torpedo level, small

 

shop vac, step ladder, and flashlight.

 

4

4

Serial Numbers including and AFTER GB13006174 and ALL EFR models

Attractive digital water heater display on control panel for setting and displaying the temperature setpoint. Pressing temperature UP and DOWN buttons changes the temperature setpoint. Same water heater display used on all models. Temperature format may be displayed in °F or °C.

Single control board with plug in wiring controls temperature, ignition, and blower operation.

Reduced number of parts for servicing and wiring. Plug in wiring reduces chance of miswirng.

Burner ignition with direct spark ignition - A high voltage spark jumps from the spark rod to the burner surface to ignite the gas. Eliminates burned out hot surface igniter replacements.

Water heater display will show diagnostic codes in the event the water heater needs servicing. Aids in diagnosing and servicing the water heater.

Water heater display can show previous error code history to further aid in servicing the water heater.

NOTICE:

THE EF100T399 MODEL SERIES DO NOT USE THE HONEYWELL INTEGRATED CONTROL SYSTEM. THESE MODELS USE THE UT ELECTRONICS CONTROL MODULE WITH HOT SURFACE IGNITION.

5

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Recovery GPH

 

 

 

 

 

 

 

DIMENSIONS (INCHES)

 

 

 

 

 

 

 

 

at Degree Rise

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

B

C

D

E

F

G

H

 

 

 

 

 

 

 

 

1st Hr

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input

Del

 

 

 

 

Stg

Therm

Ht

 

Dia

Flr

Flr to

Flr to

Flr To

Flr. To

Flr to

Front

Space

Gas

T&P

Shpg

 

 

Gal

 

 

 

 

 

 

Model No

Rate

40°F

 

100°F

140°F

Cap

Eff

 

 

 

to

Inlet

T&P

Outlet

Air

Gas

Wtr

Heating

Conn

Valve

Wt

 

@

 

 

 

 

 

 

BTU/h

 

 

 

 

U.S.

%

 

 

 

Vent

Wtr

Valve

Wtr

Intake

Conn

Conn

Conn

Dia

Open

(lbs)

 

 

100°F

 

 

 

 

 

 

 

 

 

 

Rise

 

 

 

 

Gal

 

 

 

 

Outlet

Conn

Conn

Conn

 

 

Dia

Dia

(NPT)

(NPT)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EFR-1-60T-120

120,000

180

345

138

99

60

95.0

57

 

28 ¼

5

13

40

42 ¼

52 ½

53 ½

1

1

¾

¾

570

 

EF60T125

125,000

187

363.6

145.5

103.9

60

96.0

57

 

28 ¼

5

13

40

42 ¼

52 ½

53 ½

1 ½

1

¾

¾

570

 

EF60T150

150,000

211

422.7

169.1

120.8

60

93.0

57

 

28 ¼

5

13

40

42 ¼

52 ½

53 ½

1 ½

1

¾

¾

570

 

EF60T199

199,999

265

557.6

223

158

60

92.0

57

 

28 ¼

5

13

40

42 ¼

52 ½

53 ½

1 ½

1

¾

¾

570

 

EF100T150

150,000

250

450.5

180.2

129

100

99.1

77 5/8

 

28 ¼

5

13

60

62 ¼

73 1/8

74 ¾

1 ½

1

¾

¾

900

 

EF100T199

199,999

309

597

238.8

171

100

98.5

77 5/8

 

28 ¼

5

13

60

62 ¼

73 1/8

74 ¾

1 ½

1

¾

¾

900

 

EF100T250

250,000

364

734.8

293.9

210

100

97.0

77 5/8

 

28 ¼

5

13

60

62 ¼

73 1/8

74 ¾

1 ½

1

¾

¾

900

 

EF100T300

300,000

405

836.4

334.5

239

100

92.0

77 5/8

 

28 ¼

5

13

60

62 ¼

73 1/8

74 ¾

1 ½

1

¾

¾

900

 

EF100T399

399,999

521

1,127

451

322

100

93.0

77 5/8

 

28 ¼

5

13

60

62 ¼

73 1/8

73 ¼

1 ½

1

1

1

950

6

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power supply

Dedicated 120 VAC, 60 Hz, 15A, GFI

 

 

 

 

Minimum 1" NPT for EF100T399, all others ¾" NPT

 

 

 

Gas Supply

 

 

 

(schedule 40 black iron pipe recommended)

 

 

 

 

 

 

 

Approved Gas Type

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

 

 

 

 

 

 

 

 

 

 

Approved Vent Materials

PVC or CPVC

 

 

 

 

 

 

 

 

 

 

 

Minimum Clearance

18" from top, 24" from front, 4" sides and rear.

 

 

 

for Servicing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maximum Water Supply

150 PSI

 

 

 

 

Pressure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thermostat Sensor

11,900 Ohms @ 70°F, ECO opens @ 201°F Max., ECO close @ 100°F Min.

 

 

 

 

 

 

 

 

 

Temperature Dial

Min. set point 5400-6600ohms, Max set point0-50ohms.

 

 

 

 

 

 

 

 

 

Thermostat Board

Max temp 180°F, Min temp 91°F, 24VAC, 60Hz max.

 

 

 

 

 

 

 

 

 

Ignition Module

See “Sequence of Operation, for models starting with CF serial and later”

 

 

 

 

 

 

 

 

 

Transformer

120VAC primary, 24VAC secondary, 40VA.

 

 

 

 

 

 

 

 

 

Hot Surface Igniter

120VAC, 30-120ohms @ 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

Not required.

 

 

 

 

later

 

 

 

 

 

 

Intake Pressure Switch

 

 

 

 

 

 

serial numbers prior to

24VAC, normally closed, opens on vacuum increase @ -1.20W.C.

 

 

 

“CF”

 

 

 

 

 

 

Blocked Vent Pressure

 

 

 

 

 

 

Switch “CF” serial

24VAC, normally closed, opens when pressure increases to +2.70 W.C.

 

 

 

number or later

 

 

 

 

 

 

 

24VAC, normally open, closes on pressure increase as follows

 

 

 

 

Note 1:

 

 

 

 

 

 

+2.58" W.C.

EF(60,100)T199

 

 

 

Exhaust pressure switch

 

+1.50" W.C.

EF100T150 (see note 2)

 

 

 

serial numbers prior to

 

+1.22" W.C.

EF60T150, EF100T250

 

 

 

“CF”

 

+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, .6-1amps, 6400 RPM.

 

 

 

 

 

 

 

 

 

Combustion Levels

CO2: 10-11%,CO: less then 0.04 percent (400 PPM) air free

 

 

 

 

 

 

 

 

 

 

 

 

 

7

 

7

Serial Numbers including and AFTER GB13006174 and ALL EFR models

Power supply

Dedicated 120 VAC, 60 Hz, 15A

 

Minimum ¾" NPT

Gas Supply

(schedule 40 black iron pipe recommended)

 

Approved Gas Type

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

 

 

Approved Vent Materials

PVC or CPVC

 

 

Minimum Clearance

18" from top, 24" from front, 4" sides and rear.

for Servicing

 

 

 

Maximum Water Supply

150 PSI

Pressure

 

 

11,900 Ohms @ 70°F, ECO opens @ 207°F Max., ECO close @ 120°F Min. Redundant

Thermostat Sensor

sensor for ECO. Sensor inside well for easy replacement of sensor.

 

 

Digital display, 24 volts. Temperature Range: 70-180deg. F. Used to set tank temperature

 

Control Display

(deg. F or deg. C), show operating status, Display error codes, error code history, limit

 

maximum setpoint temperature.

 

Operates from 24 volt from transformer. Controls tank temperature, ignition functions,

Control Board

combustion blower. See ignition timings in sequence of operation for Integrated Control.

 

 

 

Transformer

120VAC primary, 24VAC secondary, 40VA.

 

 

Spark Rod Igniter

0.22" nominal gap to the burner surface.

 

 

Flame Sensor Output

Minimum 1 micro amp, Typical range 5 to 30 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.

 

 

Blocked Vent Pressure

24VAC, normally closed, opens when pressure increases to +2.70 W.C.

Switch

 

 

 

Blower

120VAC, 60Hz, .6-1amps, 6400 RPM.

 

 

Combustion Levels

CO2: 10-11%,CO: less then 0.04 percent (400 PPM) air free

 

 

NOTICE:

THE EF100T399 MODEL SERIES DO NOT USE THE HONEYWELL

INTEGRATED CONTROL SYSTEM. THESE MODELS USE THE UT

ELECTRONICS CONTROL MODULE WITH HOT SURFACE IGNITION.

8

8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Balanced Direct Vent Systems

 

 

 

 

 

 

 

 

 

 

 

 

Power Vented Systems

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PVC, CPVC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PVC, CPVC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Total length of intake piping and exhaust piping

 

 

 

 

 

Total length of exhaust piping must not exceed

 

 

 

 

added together must not exceed “Maximum

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

“Maximum Vent Length”

 

 

 

 

 

 

 

 

 

 

 

Combined Length”

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Shown below

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Shown below

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maximum Combined Length (feet)

 

 

 

 

 

 

 

 

 

 

 

Maximum Vent Length (feet)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Model Number

 

 

2"

 

3"

 

 

 

4"

 

 

 

 

 

Model Number

 

2"

3"

 

4"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EFR-1-60T120

 

 

60'

 

120'

 

 

 

170'

 

 

 

 

 

 

EFR-1-60T120

 

60'

120'

170'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EF60T125, EF100T150

 

 

30'

 

120'

 

 

 

170'

 

 

 

 

EF60T125, EF100T150

 

30'

120'

170'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EF60T150, EF100T199

 

 

30'

 

100'

 

 

 

150'

 

 

 

 

EF60T150, EF100T199

 

30'

100'

150'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EF60T199

 

 

30'

 

80'

 

 

 

130'

 

 

 

 

 

 

 

 

 

EF60T199

 

30'

80'

130'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EF100T250

 

 

N/A

 

80'

 

 

 

130'

 

 

 

 

 

 

 

EF100T250

 

N/A

80'

130'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EF100T300

 

 

N/A

 

60'

 

 

 

110'

 

 

 

 

 

 

 

EF100T300

 

N/A

60'

110'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EF100T399

 

 

N/A

 

50'

 

 

 

100'

 

 

 

 

 

 

 

EF100T399

 

N/A

50'

100'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Unbalanced Direct Vent Systems

 

 

 

 

WARNING! The EF100T250 and EF100T300 models are not

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Air intake

CAN NOT

exceed exhaust

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

approved for 2 inch diameter vent pipe. Venting with 2 inch

 

 

 

 

 

 

 

 

 

 

by more than 30 feet

 

 

 

 

 

 

pipe on these models may result in damage to the water heater

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

or cause an unsafe condition. DO NOT use 2 inch Vent or Air

 

 

 

 

Notes:

 

 

 

 

 

 

 

 

 

Intake Pipe on EF100T250/300 models.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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.

9

9

For models prior to CF serial numbers

For models prior to CF serial numbers

1

2

3

Thermostat calls for heat.

-Priorto 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.

Blower energizes.

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.

4Blower pre-purgeperiod (5 seconds) indicated by the PURGE LED on the module.

5Igniter warm up (18 seconds), indicated by the IGNITER LED on the module.

6Trial 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.

7Steady 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-energizedand system attemptsre-ignitionstarting at pressure switch proving mode.-Flamesensor circuit.

-If flame is lost, gas valve is shut down, system will post purge and system attempts re-ignitionstarting at pressure switch proving mode.

8

9

Thermostat satisfies.

Burner off.

10 Blower post purge (15 seconds).

10

10