Service Instructions; General - L.B. White Boss 400 DF Manuel Du Propriétaire Et Directives D'installation

18
Boss DF Construction Heaters

Service Instructions

WARNING
Burn Hazard
■ Some 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.
■ 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.
Owner's Manual • Boss DF

General

1. Close the heater's fuel supply valve and disconnect
its electrical supply before servicing.
2. Remove the upper case cover for access to motor,
fan, pressure switch tubes, and burner related
components.
3. Disconnect the appropriate electrical leads for the
electrical component being replaced.
4. Remove the heater's control box cover for access to
the ignition control, pressure switch, relay, selector
switch and circuit breaker.
5. The differential air pressure switch, located in the
control box, must not be bypassed prior to motor
start-up. If bypassed prior to the motor starting, the
ignition control will not allow heater operation.
6. Disconnect the gas supply hose if replacing the
heater's low- pressure regulator, or solenoid valve.
7. The thermostat, circuit breaker, and selector switch
may be bypassed to determine if the component
is defective. Disconnect the component's electrical
leads and then connect the leads together with a
jumper wire. Never leave any heater component in
a bypassed condition.
8. For reassembly, reverse the respective service
procedure.
9. Clean the burner's gas jets with compressed air.
Do not use files, drills, broaches, etc. to clean the
burner's holes. Doing so may enlarge the holes
causing combustion or ignition problems.