Service Instructions - L.B. White Commander Owner's Manual And Instructions

Service Instructions

WARNING
Burn Hazard
■ Heater surfaces are hot for a period of time after
the heater has been shut down.
■ Allow the 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 heater
components or gas train components such as gas
valves, or gas hoses.
■ 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 heater and
disconnect the electrical supply before servicing unless
necessary for your service procedure.
2. Clean the heater's manifold holes with compressed
air. Do not use files, drills, broaches, etc. to clean the
holes. Doing so will enlarge the hole, causing
combustion or ignition problems. Ensure all manifold
holes are clean and clear of blockage. DO NO blow
debris back into the manifold tube. Replace the
manifold pipe if it cannot be cleaned properly.
BURNER ASSEMBLY
Owner's Manual •
Commander Ductable Make-Up Air Heater
3. The high limit and heat/vent 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 heater lights, the component is defective and must be
replaced.
-- Do not leave the jumper on or operate the 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 pressure switches must not be jumpered. If
jumpered, the ignition control will not allow heater operation.
Test the air pressure switch for continuity. If defective,
replace the switch
5. Open the respective case panel for access to burner or fan
related components.
6. For reassembly, reverse the respective service
procedure. Ensure gas connections are tightened securely.
7. After servicing, start the heater to ensure proper
operation and check for gas leaks.
BLOW COMPRESSED
AIR INTO THE UNION
Commander Ductable Make-Up Air Heater
17