L.B. White 300 Director - Manual (Page 14)

1. Disconnect the electrical supply before servicing
unless necessary for your service procedure.
2. Clean the heater’s nozzle with compressed air or a
soft, dry rag. Do not use files, drills, broaches, etc. to
clean the nozzle hole. Doing so will enlarge the hole,
causing combustion or ignition problems. Replace the
nozzle if it cannot be cleaned properly.
3. The high limit, thermostat, and air pressure switch can
b e te s te d by d i s c o n n e c t i n g t h e l e a d s a t t h e
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
t h e p a r t i s d e fe c t i ve . Re p l a c e t h e p a r t
immediately.
-- An alternate method for checking the components
is to perform a continuity check.
5. All serviceable components such as the burner, high
limit, switch,pump, motor, fan, and photocell are
accessed by removing the upper shell at the fan end
of the heater. Electrical components,such as ignition
module,on/off switch, relay, and ignition transformer,
are accessed by opening the control box on the heater.
6. Disconnect the electrical leads for the respective
component.
7. For reassembly, reverse the respective ser vice
procedure. Ensure fuel connections are tightened
securely.
8. After servicing, start the heater to ensure proper
operation.
13
-- If cleaning out nozzle, remove the fuel line from
the nozzle inlet as shown in Fig. 7. Blow out with
air.
-- If removing nozzle from burner, proceed as follows.
1. Disconnect the fuel line, ignition cables, and photo cell
from burner head. Loosen the three nuts at burner head.
and remove head from heat chamber. See Fig.7.
2. Remove the nut as shown in Fig.8.
3. Remove nozzle with manifold and turbo disc from
head.See Fig.9.
4. Loosen screw securing turbo disc to manifold. See Fig.9.
5. Remove the nozzle from the manifold.
BURNER NOZZLE
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.
■
All component parts must be replaced if defects are
found.
■
Failure to follow this warning will result in fire, causing
property damage, injury, or death.
GENERAL
FIG. 7 FIG. 8
NUT
FUEL LINE
FIG. 9
IGNITION
CABLES
PHOTO
CELL
NUT
TURBO DISC
NOZZLE