Ignitor; Flame Sensor; High Limit Switch - L.B.White Guardian AW060 Manual De Instrucciones

Guardian LP or Natural Gas Heater
20
Igniter
1. See Fig. 13 for disassembly.
2. When reassembling, snug in the igniter
mounting screw. (Do not overtighten).
Testing
-- Perform an ohm check across the igniter
leads of a cold igniter. Ohm readings will
vary somewhat, but generally will be in
the 40-70 ohm range. A reading showing
overload or infi nite resistance indicates a
defective igniter.

Flame Sensor

1. Remove the sensor from its mounting
bracket. See Fig.13. Clean the sensor rod
with steel wool or emery cloth. Rub briskly
to remove build up of dust, dirt and oxide.
FIG. 13
IGNITER
SHIELD
SCREW
WASHER
MALE CONNECTOR
2. Check the fl ame sensor's insulator base
for cracks. If cracks are found, replace the
sensor.
3. Position the fl ame sensor as shown in
Fig. 14.
FIG. 14
3/8 TO 1/2 IN.
BURNER
FLAME
BURNER
CASTING
Owner's Manual • Guardian
SENSOR
BURNER
BRACKET
SCREW
FEMALE CONNECTOR
FLAME SENSOR

High Limit Switch

WARNING
Burn Hazard
■ Do not operate the heater with the high limit
switch bypassed.
■ Operating the heater a bypass high limit switch
may lead to overheating, possibly resulting in
a fi re, with subsequent damage to the heater,
building damage, or loss of livestock.
This heater uses a high limit heat switch for
the purpose of over heat protection. The high
limit switch is located on the heat chamber,
see Fig.15. It is connected between the igni-
tion control and the gas control valve.
The switch has normally closed contacts. If an
overheat condition occurs, the switch contacts
will open, thereby opening the circuit to the
gas control valve. The high limit switch should
be tested a minimum of once per year when
the heater is given a thorough cleaning.
1. Remove the switch. Holding the switch
by one of its mounting legs, apply a small
fl ame only to the sensing portion on the
back of the switch. See Fig.16. Do not
melt the plastic housing of the switch when
conducting this test.
2. Within a minute, you should hear a pop
coming from the switch, which indicates the
contacts of the switch have opened. Check
for lack of electrical continuity across the
switch terminals to verify contacts have
opened.