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Guardian with Smart Sense™
www.lbwhite.com
Owner’s Manual • Guardian
22
Signal Conditioner
The conditioner receives the incoming electrical signal
from the building’s environment control and then ampli-
fi
es it to allow operation of the heater’s variable rate
gas control valve.
This component operates off of 24 VAC received from
the transformer in the heaters control box.
If the transformer does not supply 24 VAC to the condi-
tioner, or if the conditioner is defective, the variable rate
gas control will operate at minimum heat output only.
(See data plate or page 4 of this manual for minimum
output, depending on model.)
FIG. 18
Ignition Control (HSI)
The control sends and receives voltages to operate or
verify operation of components. Refer to the following
and Fig. 19 to understand the ignition control’s terminal
designators if doing voltage checks on the control.
IND:
120 VAC from control to motor
L1:
120 VAC to control
HSI:
120 VAC to hot surface igniter
HSIG:
Neutral return of igniter
L2:
Neutral of control
W:
24 VAC input from 40 VAC transformer (without this
voltage the ignition control will not function)
PSI:
24 VAC from control to air proving switch
FSI:
Microamperage from control to
fl
ame sensor
GV:
24 VAC from control to high limit and then to gas
control valve.
PSO:
24 VAC return from air proving switch back to
control
FSG:
Ground of
fl
ame sensor
C:
Ground for control
Refer to “Hot Surface Igntion Operation Sequence”
within this manual to understand operation of the
ignition control during a call for heat.
FIG. 19
Ignition Control (Spark)
Like the controller for the hot surface igntion heat-
ers, the spark igntion control sends and receives
voltages to verify operation of components. Refer
to the following and Fig. 20 to understand the igni-
tion control’s terminal designators if doing voltage
checks on the control.
L1:
120 VAC to control from power supply
IND:
120 VAC from control to fan motor
LED:
Connection for control’s diagnostic light
wiring harness
MV:
24 VAC from control to high limit switch and
then to the gas control valve.
PS2:
24 VAC from air proving switch back to
control
PS1:
24 VAC from control to air proving switch
W:
24 VAC from 40 VAC transformer to control
(without this voltage the ignition control will not
function)
FS:
Microamperage from control to
fl
ame sensor for
proving burner
fl
ame
R:
No terminal
X:
No terminal
C/COM:
Control and burner ground
Refer to “Spark Igntion Operation Sequence” within
this manual to understand operation of the ignition
control during a call for heat.
Building con-
troller control
signal connec-
tions (screw
terminal) mA or
DCV
Output to the gas
control valve
24V transformer
connection
Selector
Switch
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