LB White Guardian AD060 Manual Del Usuario página 28

28
Guardian with Smart Sense™
Regardless of ignition type, the control
logic incorporated in the building control-
ler then manages the ouput of the Smart
Sense™ heater as necessary to achieve
and maintain the desired room tempera-
ture.
Note: When properly set up, the Smart Sense™
variable rate heater will run for long periods of
time - much longer than typically experienced
with on/off heating. This is normal and is key
to achieving the consistent air temperatures
and fuel savings associated with Smart Sense
variable rate heating.
If the building controller determines that heat is no
longer required, it will shut the heater off and then
will initiate the heating sequence again when heat is
required.
OPERATION SEQUENCE:
HOT SURFACE IGNITION
— A call for heat occurs from the building controller.
— 120 VAC is sent to transformer and to ignition
control.
— 0-10 VDC, 0-20 mA, or 4-20 mA signal is sent to
signal conditioner from building controller.
— Signal conditioner changes the building controller
input signal to 0-15 VDC which is sent to variable
rate gas control valve.
— Transformer reduces line voltage to 24 VAC
-- 24 V.A.C. is sent from transformer to the ignition
control and signal conditioner.
— Red light on ignition control is illuminated
— Ignition control module performs an internal safe
start check
-- Internal components are tested
-- Amperage is sent to fl ame sensor from ignition
control to start fl ame proving process.
-- Ignition control terminal PSI sends 24 VAC to air
proving switch.
— Ignition control module begins safety lockout timing
— Ignition control module sends 120 VAC from
terminal IND to the fan motor.
-- Fan motor starts
-- Air proving switch closes and 24 VAC is returned
to ignition control terminal PSO.
— Fan motor stops.
— Ignition control sends 120 VAC from terminal HSI
to the igniter.
-- Igniter heats up in 17 seconds.
— Ignition control restarts the fan motor.
— Air proving circuit is rechecked.
— Ignition control sends 24 VAC from terminal MV to
the gas control valve through the high limit switch.
Owner's Manual • Guardian
— Ignition occurs.
-- Ignitor stays powered for 6 seconds until fl ame
proving occurs.
— Ignition control shuts the ignitor down.
-- Gas valve stays open
OPERATION SEQUENCE:
SPARK IGNITION
— A call for heat occurs from the building controller.
— 120 VAC is sent to transformer and to ignition control
— 0-10 VDC, 0-20 mA, or 4-20 mA signal is sent to
signal conditioner from building controller.
— Signal conditioner changes the building controller
input signal to 0-15 VDC which is sent to variable
rate gas control valve.
— Transformer reduces line voltage to 24 VAC.
— 24 VAC is sent from transformer to the ignition
control and to signal conditioner.
— Red light on ignition control is illuminated
— Ignition control module performs an internal safe
start check
-- Internal components are tested
-- Amperage is sent to fl ame sensor from ignition
control to start fl ame proving process.
-- Ignition control terminal PS1 sends 24 VAC to air
proving switch.
— Ignition control module begins safety lockout timing
— Ignition control module sends 120 VAC from terminal
IND to the fan motor.
-- Fan motor starts
-- Air proving switch closes and 24 VAC is returned to
ignition control terminal PS2.
— Ignition control sends power to the igniter.
-- Igniter sparks.
— Ignition control sends 24 VAC from terminal MV to
the gas control valve through the high limit switch.
— Ignition occurs.
-- Igniter sparks until fl ame proving occurs.
— Ignition control shuts off igniter spark.
-- Gas valve stays open