available, use a clean, dry cloth to remove accumula-
(3) Pull straight out on the warm air louver (8) to
tions of dust and lint.
remove it from the housing,
(3) If any of the data plates are defaced or illegible,
(4) If the nut plates (17) are damaged, remove the
report the condition to direct support maintenance.
screws (15) and lock washers (16) that secure them to
the bottom of the case; remove the nut plates.
(4) Before reinstalling covers and warm air louver,
inspect heater components for fuel leaks, signs of burn-
b. Cleaning and Inspection
ing or overheating, or other damage or malfunction.
Refer to the appropriate repair sections of this publica-
Clean parts in a well-ventilated area.
tion for repair and replacement procedures.
Avoid inhalation of solvent fumes and
prolonged exposure of skin to cleaning
c. Reassembly. Reassemble the heater case and cover
panels in the reverse order of the index numbers in
solvent. Wash exposed skin
thoroughly, Dry cleaning solvent (fed.
spec. P-D-680) used to clean parts is
4-19. Control Panel Components.
potentially dangerous to personnel
and property. Do not use near open
The ignition system of this heater con-
flame or excessive heat. Flash point of
tains dangerous voltages which can
solvent is 100°F (38°C).
cause severe electrical shock. Be sure
(1) Using a dry cloth, wipe dust and lint from the
to disconnect the power plug before
top and side cover panels, warm air louver, and com-
repairing the heater.
bustion air inlet. Remove greasy or gummy deposits
with a cloth dampened with dry cleaning solvent (fed.
(1) Disconnect the power plug and remove the top
and side cover panels to provide access to the back of
the control panel.
(2) Check the inside of the heater case for ac-
(2) Remove the five screws (1, fig. 4-5) and lock
cumulations of dust and lint. If vacuum cleaning equip-
washers (2) securing the control panel assembly (7) to
ment is available, use it to clean the inside of the heater
the heater case. Pull out gently on the control panel to
case, taking care not to disturb the wiring or damage
provide access to the wiring on the back of the panel.
components. If vacuum cleaning equipment is not
Figure 4-5. Control panel, exploded view.