TM 9-4520-272-14&P
OPERATOR AND/OR FIELD MAINTENANCE
LARGE CAPACITY FIELD HEATER (LCFH)
OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES
WARNING
Hearing protection should be worn when performing any troubleshooting or maintenance
function requiring that the heater be operating with any of the access panels open or within
close vicinity. Failure to wear ear protection could result in hearing loss or damage.
Table 1. Operator Preventive Maintenance Checks and Services.
ITEM INTERVAL LOCATION
PROCEDURE
NOT FULLY MISSION
NO.
CAPABLE IF:
ITEM TO
CHECK/SERVICE
There are holes, tears,
1
Before
Air Supply and
Check the fresh air inlet (1) and heated
or other damage that
Return Ducts
air outlet (2) ducts for holes and tears in
cannot be repaired
the fabric. Repair damaged ducts if
and that would permit
possible, replace duct if damage cannot
air to enter or escape
be repaired.
through the side walls
of the duct.
Check outside surface of duct for any dirt Excessive dirt or
debris is present on
or debris. Clean dirt and debris from
duct.
exterior of duct with a clean dry rag.
Obstructions within the
Check for and remove any obstructions
duct that cannot be
inside of ducts.
cleared.
Mounting rings
Inspect mounting rings (3) on ends of
damaged so as to
ducts for any type of damage that would
prevent proper
prevent the duct from being properly
mounting to heater
mounted to the heater inlet and outlet
ducts.
ducts.
During
Periodically check the fresh air inlet duct
Excessive dirt or
debris is present in the
area (1) and screen for dirt and debris. If
return duct and inlet
excessive dirt or debris is evident,
screen area that
temporarily shut down the heater and
restricts airflow.
clean/remove the dirt and debris.
After
After shutting down the heater, if
Excessive dirt or
excessive dirt or debris is evident on the
debris is present in the
fresh air inlet duct area
fresh air inlet duct area (1) and/or inlet
and/or inlet screen
screen, clean/remove the dirt and debris.
area that restricts
airflow.
