L.B. White I17, Owner'S Manual And Installation Instructions

19

READ THIS ENTIRE SECTION BEFORE

BEGINNING TO TROUBLESHOOT PROBLEMS.

The following troubleshooting flow charts provide systematic

procedures for isolating heater problems.  The charts are

intended for use by a QUALIFIED GAS HEATER SERVICE

PERSON.  DO N

NOT S

SERVICE TTHE H

HEATER U

UNLESS YYOU H

HAVE

BEEN PPROPERLY TTRAINED.

TEST EQUIPMENT REQUIRED

The following pieces of test equipment will be required to

troubleshoot this system with minimal time and effort.

• Digital M

Multimeter - For measuring AC voltage.

• High PPressure G

Gauge - (L. B. White Part No. 500-20736)

For checking inlet pressures to the heaters.

INITIAL PREPARATION

1. Visually inspect equipment for apparent damage.

2. Check all wires and gas hoses for abrasion and wear.

Replace any that are suspect.

3. Make sure the heater is properly installed and meets

minimum clearances to nearest combustible

materials.  (Refer to dataplate on the heater, also on

page 4 of this manual.)

Heater PProblems

Page

1. Heater does not light  . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

2. Heater lights, but will not stay lit  . . . . . . . . . . . . . . . . . . .21

3. Burner flame extending beyond outer cone

or black soot on inside of canopy  . . . . . . . . . . . . . . . . . .22

Components should be replaced only after each step has

been completed and replacement is suggested in the flow

chart.  Refer to the “Servicing” sections as necessary to

obtain information on disassembly and replacement

procedures of the component once the problem is identified

by the flow chart.

OPERATION SEQUENCE:

--

A call for heat occurs from building thermostat.

--

Line voltage is sent from building’s temperature control 

to heater’s ON/OFF switch.

--

Switch sends power to ignition control through high        

limit switch when positioned to ON.

--

Ignition control module begins ignition trial sequence

--  Ignition control sends high voltage to igniter 

electrode

--  Igniter sparks

--  Gas control solenoid opens

--

Ignition occurs

--  Igniter continues to spark for 10 seconds until 

flame proving occurs

--  Ignition spark is shut off

--  Gas control solenoid stays open

--

Ground warms to desired temperature

--  Building thermostat is satisfied

--  Heater shuts down

--

Process is repeated on a call for heat

IGNITION FAILURE SEQUENCE:

--

Ignition control will make three ignition trials

--  Each trial lasts 10 seconds

--  15 seconds time span between each trial

--

If ignition control does not establish flame sense within 

ignition trial:

--  Ignition spark shuts off

--  Gas valve closes

--

After three ignition trials, ignition control will wait for 15

minutes before retrying for ignition.

--

This process will be repeated continually until the 

ignition problem is solved.

--

To manually reset the ignition control:

--  Unplug the heater and plug it back in

OR

--  Turn the building temperature to off and then 

back on.

Troubleshooting Guide

WARNING

Electrical S

Shock aand B

Burn H

Hazard

■

Troubleshooting this system may require operating the

heater with the burner on.  Use extreme caution when

working on the heater.

■

Failure to follow this warning may result in property

damage, personal injury or death.