Troubleshooting Guide; Operation Sequence - L.B.White I-17 Manual Del Usuario E Instrucciones

44
I-17 / I-40 Manual and Spark Ignition
Spark Ignition Heaters

Troubleshooting Guide

READ THIS ENTIRE SECTION BEFORE
BEGINNING TO TROUBLESHOOT
PROBLEMS.
TEST EQUIPMENT REQUIRED
The following pieces of test equipment will be
required to troubleshoot this system with minimal time
and effort.
• Digital Multimeter - For measuring voltage.
• Pressure Gauge - (Part No. 20736) For checking
inlet pressures to the heaters.
INITIAL PREPARATION
-- Inspect the heater for damage.
-- Clean the heater as necessary.
WARNING
Electrical Shock and Burner Hazard
■ Troubleshooting this system may require operat-
ing the heater with the burner on. Use extreme
caution when working on the heater.
■ Failure to follow this warning may result in elec-
trical shock or burns causing severe injury.
Heater Problems
1. Heater does not light ........................ 45
2. Heater lights, but will not stay lit ....... 46
3. Heater backflashes gas through
air inlet .............................................. 46
Owner's Manual • I-17 / I-40
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.
-- 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:
Page
-- 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
-- Turn the building temperature control to off and
then back on.
-- Turn ON/OFF switch on heater off and then on.
OR
OR