TM 5-4520-253-13
l N S P E C T / S E R V I C E H E A T E R C A S E A S S E M B L Y ( C O N T )
SERVICING:
Dry cleaning solvent P-D-680 (safety or Stoddard’s Solvent)
is potentially dangerous.
Avoid repeated and prolonged
breathing of vapors and skin contact with the liquid. Do
not use near open flame, arcing equipment, or other igni-
tion sources. Always wear eye protection and protective
clothing. Flash point of P-D-680 is 100° to 138° F (38° to
59°C).
Death or serious injury could occur if compressed air is
directed against the skin. Do not use compressed air for
cleaning or drying unless the pressure is/has been reduced to
30 psi (207 kPa) or less.
When working with compressed
air always use chip guards, eye protection, and other per-
sonal protective equipment.
Death or serious injury could occur if precautions are not
taken when maintaining this equipment. Position HEATER-
OFF-FAN switch to OFF, remove power cable plug from
POWER RECEPTACLE, and ground capacitors C1 and C2
prior to gaining access to heater compartments. Terminals
of capacitors are accessible at end cover of combustion
blower. Always disconnect power cable before making con-
tinuity tests or before repairing heater. Always have
another person standing by who is trained in electric shock
first aid.
Remove electrical charge from ventilating air motor capaci-
tor C3 by shorting out contacts using tool having insulated
handle.
Allow sufficient time for heater to cool to room tempera-
ture before gaining access to heater compartments.
1. Remove grease, oil, and fuel deposits by wiping heater case with rags dampened with P-D-680 dry
cleaning solvent. Remove excess dry cleaning solvent and dry with compressed air.
2. Remove six screws (1) and lock washers (2). Lift off bottom cover (3).
3. Reach through heater case opening (4) and disconnect louver linkages from louvers.
4. Remove louver panels (5 and 6) by unlocking eight studs (7) at each panel.
5. Clean and inspect interior including combustion blower and ventilating air motor.
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