Ignitor & Flame Sensor Assembly; Flame Sensor; High Limit Switch - L.B.White Guardian AD060 Manual Del Usuario E Instrucciones

Guardian LP or Natural Gas Heater
20
Igniter & Flame
Sensor Assembly
Refer to Fig.12 (AD100 and AD250) or Fig.13
(AD060) for servicing of the igniter assembly.
• The igniter /sensor assembly may require
cleaning due to accumulations of dust and
dirt over a period of time, affecting its ability
to ignite fuel gas and sense burner fl ame.
Cleaning will require igniter/sensor removal.
-- If spark appears to be weak, rub the igniter
electrode with emery cloth or steel wool to
remove any buildup.
-- If the spark appears strong but the heater
cycles off, rub the sensor rod with emery
cloth or steel wool to remove any build-up.
• Ensure the igniter gap is 1/8 – 3/16 in. and
the igniter tip is positioned over the burner
port according to the illustration below.
• Prior to start up when the heater has not
been used for an extended period of time:
-- Clean the sensor of moisture/dust.
-- Ensure the top of the burner casting is free
of corrosion. Corrosion prevents the igniter
sparking to the top of the burner.
-- Remove any corrosion with emery cloth or
a wire brush.
FIG. 12
TO GAP IGNITER LOOSEN SCREW.
MOVE ENCLOSURE UP OR DOWN
TO ALLOW PROPER POSITIONING
OF IGNITER TO BURNER.
TO REMOVE IGNITER / SENSOR WITH ENCLOSURE
REMOVE SCREW, LIFT ASSEMBLY
FROM ITS MOUNTING SLOTS
IGNITER / SENSOR
ENCLOSURE
FIG. 13
IGNITER
1/8-3/16 in.
BURNER
Owner's Manual • Guardian
SENSOR
IGNITER
1/8-3/16 in.
HEAT CHAMBER FACE
BURNER
IGNITER LEAD
SENSOR LEAD

FLAME SENSOR

REMOVE SCREW (65,9 kW MODEL ONLY)
BURNER

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.14 (AD250 shown). It is connected
between the ignition 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.15. 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.
HEAT CHAMBER
IGNITER/SENSOR
ENCLOSURE
REMOVE SCREWS