L.B. White Guardian AW060 Owner's Manual And Instructions page 63

Guardian Agricultural Animal Confinement Building Heaters
OPERATION SEQUENCE:
-- Line voltage is sent to transformer.
-- Terminal at transformer branches off line voltage to
terminal L1 on ignition control.
-- Transformer reduces line voltage to 24 VAC.
-- 24 VAC is sent to thermostat.
-- Thermostat closes and returns 24 volts to terminal W
on ignition control.
-- Red light on ignition control is illuminated.
-- Ignition control sends flame sense current to flame
sensor.
-- Ignition control module performs self safety check.
-- Internal components are tested.
-- Air proving circuit is tested
-- Control sends 24 VAC from terminal PSI to air
proving switch.
-- Ignition control module begins ignition trial sequence.
-- Ignition control sends 220 volts from terminal IND
to motor.
-- Motor starts.
-- Air proving switch closes and 24 volts are returned to
terminal PSO of ignition control.
-- Motor stops.
-- Ignition control module sends 220 volts to hot
surface igniter.
--Igniter reaches ignition temperature in 15 seconds.
-- Ignition control restarts the fan motor while sending
24 VAC to air proving switch.
-- Switch closes and 24 volts are returned back to
control.
-- Ignition control send 24 volts from terminal GV to
high limit switch.
-- If limit switch contacts are closed, limit sends 24 volts
to gas control valve
-- Gas control valve opens
-- Ignition occurs.
-- Flame sense current is passed through burner flame
back to ignition control.
-- Igniter stays powered until ignition control proves
flame sense
-- Igniter then shuts down.
-- Gas control valve stays open
-- Room warms to desired temperature.
-- Thermostat is satisfied.
-- Brood heater shuts down.
-- Process starts again on a call for heat.
IGNITION TRIAL SEQUENCE:
-- First trial for ignition takes approximately 20 seconds
-- Two more ignition trials occur
-- Second trial immediatley follows if first trial failed.
-- If second trial fails, ignition control starts a 15 minute
waiting period
-- At end of 15 minutes ignition control attempts third and
final ignition trial
-- If ignition control does not prove burner flame after third
trial, the control goes into safety lockout (3 flash)
-- Gas valve closes.
-- Hot surface igniter shuts down
-- Fan motor stops.
-- To retry for ignition, turn the brood heater off and
then on.
Owner's Manual • Guardian
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