L.B.White Guardian AD060 Manual Del Usuario E Instrucciones página 26

Guardian LP or Natural Gas Heater
26
OPERATION SEQUENCE:
-- 115 volts is sent to transformer and to ignition
control terminal L1.
-- 24 volts is sent from transformer to the
thermostat.
-- A call for heat occurs.
-- Thermostat returns 24 volts to ignition control
terminal W.
-- Red light on ignition control is illuminated.
-- Ignition control performs an internal safe
start check.
-- Internal components are tested.
-- Ignition control sends 24 volts from terminal
PS1 to the air proving switch.
-- Ignition control begins safety lockout timing.
-- Ignition control sends 115 volts from terminal
IND to start the fan motor.
-- Air proving switch is checked for proper
operation.
-- Air proving switch closes and 24 volts are
returned to control terminal PS2
-- Ignition control powers the igniter and igniter
sparks.
-- Ignition control sends 24 volts to gas control
through high limit switch.
-- Ignition occurs.
-- Igniter continues to spark until fl ame
proving occurs.
-- Igniter spark is discontinued.
-- Gas valve stays open.
-- Room warms to desired temperature.
-- Thermostat is satisfi ed.
-- Heater shuts down.
-- Process begins again on call for heat.
Owner's Manual • Guardian
IGNITION FAILURE SEQUENCE:
-- First trial for ignition takes approximately 20
seconds
-- Two more ignition trials occur
-- Second and third trials immediately follow if
fi rst trial failed.
-- Ignition control starts a 15 minute waiting
period
-- At end of 15 minutes, ignition control at-
tempts three more trials.
-- If ignition control does not prove burner fl ame
after third trial, the control goes into safety
lockout (3 fl ash)
-- Igniter shuts down
-- Gas control closes
-- Fan motor stops.
-- To retry for ignition, turn the heater off and
then on.