Start-Up Instructions - L.B. White AD250 Owner's Manual And Instructions

Follow steps 1 - 7 on initial start-up after heater installation
by a qualified service person. For normal start-up, simply set
the thermostat to a setting above room temperature.
1. Open all manual fuel supply valves and check for gas
leaks using approved leak detectors.
2. The gas control valve has a manual shut-off feature
incorporated into the valve assembly. Make sure the
indicator on the control valve is positioned to On.
FIG. 6
3. The heater has a selector switch located on the
control box. The selector switch allows you to heat or
ventilate (no heat).
FIG. 7
SWITCH POSITIONS
When the selector switch is set to HEAT the heater will
cycle on and off based upon setpoint of the
thermostat. To use the heater for ventilating, position
the selector switch to VENT. With the switch in this
position, the thermostat will not cycle the heater. The
burner will not ignite but the fan motor will operate
continually.
4. This heater includes a direct spark ignition (DSI)
control module for purposes of controlling the timing
of the ignition process of the heater as well as
monitoring of the safety functions. The DSI module is
located in the control box assembly. Refer to the
troubleshooting guide within this Owner's Manual.
Only qualified and properly-trained personnel shall
service or repair the heater.
ON
OFF
HEAT
(UP)
OFF
(MID)
VENT
(DOWN)

Start-Up Instructions

5. On a call for heat, the motor will start up and run for
five (5) seconds prior to ignition trial. This pre-purge is
a safety feature and a normal operational
characteristic. After five (5) seconds the igniter will
spark until burner flame is detected by the control
module.
6. The ignition control will make three trials for ignition.
If ignition is not proven after the third trial, the control
will lock-out the heater. The ignition control must be
reset to restart the heater. Push and release the reset
switch located on the control box. See Fig. 8.
NOTE: It is normal for air to be trapped in the gas
hose on new installations. You may have to attempt
more than one trial for ignition before the air is finally
purged from the line and ignition takes place.
FIG. 8
RESET SWITCH
(PUSH AND RELEASE TO RESET)
7. Do not exceed the input rating stated on the dataplate
of the heater. Do not exceed the burner manifold
pressure stated on the dataplate. Do not use an
orifice size different than specified for the specific
input rating of this heater, fuel type configuration and
altitude.
FUSE
SELECTOR SWITCH,
HEAT / OFF / VENT
12