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Guardian Agricultural Animal Confinement Building Heaters
www.lbwhite.com
Owner’s Manual • Guardian
16
Service Instructions
1. Close the fuel supply valve to the brood heater
and disconnect the electrical supply before servic
-
ing unless necessary for your service procedure.
2. Open side panels for access to brood heater
components.
3. Disconnect the appropriate electrical leads for the
component being replaced.
4. The thermostat, and high limt switch can be
tested by jumpering the suspect part out of the
electrical circuit:
-- Reconnect the electrical supply and open fuel
supply valves.
-- If the brood heater lights, the component is defec
-
tive and must be replaced.
-- Do not operate the brood heater with the compo
-
nent jumpered. Replace the part immediately.
-- An alternate method for checking the components
is to perform a continuity check.
5. Do not jumper the air proving switch. If jumpered,
the ignition control will not allow heater operation.
Test the air proving switch for continuity. If defec
-
tive, replace the switch
WARNING
Burn Hazard
■ Brood heater surfaces are hot for a period of
time after the brood heater has been shut down.
■ Allow the brood heater to cool before performing
service, maintenance, or cleaning.
■ Failure to follow this warning will result in burns
causing injury.
WARNING
Fire and Explosion Hazard
■ Do not disassemble or attempt to repair any
brood heater components or gas train compo
-
nents.
■ All component parts must be replaced if defects
are found.
■ Failure to follow this warning will result in fire or
explosions, causing property damage, injury, or
death.
6. For reassembly, reverse the respective service
procedure. Ensure gas connections are tightened
securely.
7. After servicing, start the brood heater to ensure
proper operation. Check for gas leaks with ap
-
proved leak detectors.
8. Clean the brood heater’s orifice with compressed
air or a soft, dry rag. Do not use files, drills,
broaches, etc. to clean the orifice. Doing so may
enlarge the hole, causing combustion or ignition
problems. Replace the orifice if it cannot be
cleaned properly.
Fan and Motor Wheel
Assembly
1. Remove the motor mounting plate screws and
lift the fan and motor assembly from the housing.
See Fig. 7, AW250 shown.
2. Loosen the square head set screw(s) on the fan
wheel.
3. Pull the fan wheel from the motor shaft. Use a
wheel puller if necessary.
4. Remove the four (4) nuts securing the motor to
the mounting plate.
FIG. 7
NOTES:
a. Fan wheel to motor mount plate spacing must
be adjusted to the clearance specified in the
table below before tightening the fan wheel to
the motor shaft.
SCREWS
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