Start-Up Instructions; Shut-Down Instructions - L.B. White GUARDIAN Smart Sense AD250 Owner's Manual And Instructions

Follow steps 1 - 6 on initial start-up after heater installation
by a qualified gas heater service person. For normal start-
up, set the building controller to call for heat. The heater
will start.
1. Open all manual fuel supply valves and check for gas
leaks using approved leak detectors.
2. Connect the electrical cord to an approved electrical
outlet.
3. Set the building controller and L.B.White SmartBox
to desired room temperature.
4. This heater includes a direct ignition control module
for purposes of controlling the timing of the ignition
process of the heater as well as monitoring of the
safety functions. The ignition control module is
contained within the control enclosure. On the
control module is a red light emitting diode (LED).
This LED indicates the status of the heater. The LED
is visible external of the control enclosure through
the plastic eye. A constant light from the LED is an
indicator that the heater is functioning correctly. Any
flash pattern by the LED is indicative that there is a
problem in the operation of the heater. Refer to the
troubleshooting decal on the access panel at the fan
motor end of the heater for assistance in
troubleshooting. Only qualified and properly trained
personnel shall service or repair the heater.
If the heater is to be shut down for cleaning, maintenance or
repair, follow steps 1 - 4. Otherwise, set the building
controller to off.
1. Close all manual fuel supply valves.
2. With the heater lit, allow heater to burn off excess
fuel in gas supply hose.

Start-Up Instructions

5. On a call for heat, the motor will start up and run for
five (5) seconds. This pre-purge is a safety feature
and a normal operational characteristic prior to
ignition taking place. After five (5) seconds, the
igniter will begin to spark.
NOTE: It is normal for air to be trapped in the gas
hose on new installations. The heater may
attempt more than one trial for ignition
before the air is finally purged from the line
and ignition takes place.
™
6. The ignition control will make up to three trials for
ignition. Each trial for ignition will take approximately
ten (10) seconds. The first three trials for ignition will
occur within 40 seconds if ignition is not achieved. A
15 minute wait period will then begin after the third
trial for ignition has taken place. After the 15 minute
time span has elapsed, three more trials for ignition
will take place. If ignition is not achieved at this final
trial, the system will lock out, and a three flash
pattern will be indicated by the LED.

Shut-Down Instructions

3. Set the building controller and SmartBox
4. Disconnect the heater from the electrical supply.
™
to off.
13