L.B. White L-40 Mode D'emploi page 25

Components should be replaced only after each step has
been completed and replacement is suggested in the flow
chart.
OPERATION SEQUENCE:
-- A call for heat occurs from building controller.
-- 24 VAC is sent from building's controller 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 controller 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 control to off
and then back on.
OR
-- Turn ON/OFF switch on heater off and then
on.
L-40 / H-40 Spark Ignition Radiant Brooder
Owner's Manual • L-40 / H-40
25