L.B. White AW250, Owner'S Manual And Instructions

Page: 12 / 30

Follow steps 1 - 9 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. Remove the
cover from the control valve enclosure and make sure
the indicator on the control valve is positioned to
“On”. Replace the cover.
FIG. 6
3. The heater also has a selector switch located on the
control box at the motor end of the heater. The
selector switch allows you to heat or ventilate (no
heat). The switch positions are:
FIG. 7
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. Connect the electrical cord to an approved electrical
outlet.
5. Set the thermostat to desired room temperature.
6. This heater includes a hot surface ignition (HSI)
control module for purposes of controlling the timing
of the ignition process as well as monitoring safety
functions. The HSI module is contained with the
control box. On the HSI 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 circular window. 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 operation. Refer
to the troubleshooting label 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.
7. On a call for heat, the motor will start up and run for
five (5) seconds and then stop. This pre-purge is a
safety feature and a normal operational characteristic
prior to ignition taking place. After the motor has
stopped, the igniter will heat up (approximately 30
seconds). After igniter warm up time has been
achieved, the motor will start again and shortly
thereafter ignition will occur.
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.
8. The HSI control will make up to three trials for
ignition. Each trial for ignition will take approximately
20 seconds. The first two trials for ignition will occur
within 40 seconds if ignition is not achieved. A 15
minute wait period will then begin after the second
trial for ignition has taken place. After the 15 minute
time span has elapsed, the third and final trial 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.
8. Do not exceed the burner manifold pressure or the
input rating stamped on the dataplate. Do not use an
orifice size different than specified for the specific
input rating, fuel type configuration and altitude.
If the heater is to be shut down for cleaning, maintenance or
repair, follow steps 1 - 6. Otherwise, simply turn thermostat
to “off” or “no heat” for standard shut down.
1. Close all manual fuel supply valves.
2. With the heater lit, allow heater to burn off excess
fuel in gas supply hose.
3. Move the selector switch to the “off” position.
4. Turn the indicator on the gas control to “off”.
5. Turn thermostat to “off” or “no heat” position.
6. Disconnect the heater from the electrical supply.
11
Start-Up Instructions
Shut-Down Instructions
ON
OFF
SWITCH POSITIONS
HEAT
(UP)
OFF
(MID)
VENT
(DOWN)