Service Instructions - L.B. White AD100 Owner's Manual

Burn Hazard
■
Brood heater surfaces are hot for a period of time
after the 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.
Fire and Explosion Hazard
■
Do not disassemble or attempt to repair any brood
heater components or gas train components.
■
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.
1. Close the fuel supply valve to the brood heater and
disconnect the electrical supply before servicing unless
necessary for your service procedure.
2. 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 hole. Doing so will enlarge the hole,
causing combustion or ignition problems. Replace the
orifice if it cannot be cleaned properly.
1. Remove the motor mounting plate screws and lift the
fan and motor assembly from the housing. See Fig. 7,
AD250 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
SCREWS
WARNING
WARNING

Service Instructions

3. The high limit switch can be tested by disconnecting the
leads at the component, and jumpering the leads
together.:
-- Reconnect the electrical supply and open fuel
supply valves.
-- If the brood heater lights, the component is defective
and must be replaced.
-- Do not leave the jumper on or operate the brood
heater if the part is defective. Replace the part
immediately.
-- An alternate method for checking the components
is to perform a continuity check.
4. The air proving switch must not be jumpered. If
jumpered, the ignition control will not allow brood
heater operation. Test the air proving switch for
continuity. If defective, replace the switch.
5. Open the respective case panel for access to burner or
fan related components. Open the control box for
access to the ignition control, and transformer.
6. Disconnect the appropriate electrical leads when
replacing components.
7. For reassembly, reverse the respective ser vice
procedure. Ensure gas connections are tightened
securely.
8. After servicing, start the brood heater to ensure proper
operation and check for gas leaks.
MOTOR AND FAN WHEEL ASSEMBLY
-- 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.
-- Make sure that set screw(s) of the fan are on the
flats of motor shaft when tightening.
FIG. 8
MOTOR MOUNT PLATE
MOTOR
CLEARANCE
GENERAL
FAN WHEEL
6 mm AD060/AD100
3 mm AD250/AD325
13