TM 9-4520-271-14
UNIT MAINTENANCE INSTRUCTIONS
ARMY SPACE HEATER H-140
NSN 4520-01-477-0568
AIR PRESSURE SWITCH
TESTING, REMOVAL, REPAIR, INSTALLATION, ADJUSTMENT
INITIAL SETUP:
References
Test Equipment
FM 4-25.11
Multimeter (item 1, WP 0058 00)
Materials/Parts
Tools and Special Tools
Lockwasher (item 21, WP 0062 00)
Automotive general mechanic's tool kit
Wire marker tag (item 25, WP 0061 00)
(item 10, WP 0058 00)
Equipment Conditions
Personnel Required
None
One
WARNING
Contact with hot components can cause burns. Allow ASH to cool down before attempting service,
inspection, or maintenance activity.
TESTING
WARNING
FOR ARTIFICIAL RESPIRATION, REFER TO FM 4-25.11, FIRST AID.
Electrical high voltage cannot be seen but can kill you. Electricity is unlike most other dangerous things
you can come in contact with because it gives no warning and no symptoms to be wary of. Its effect is
immediate. It can kill you, render you unconscious, or severely burn you.
To ensure your safety and that of other maintenance personnel, always observe the following precautions:
DO NOT perform any maintenance on electrical equipment unless all power is removed.
BE CERTAIN that there is someone assisting you who can remove power immediately.
1.
Open control box cover (1) and control panel (2).
2.
Connect multimeter to S1-41 and S1-24 (3). If meter indicates continuity, switch is closed. Leave multimeter
connected.
3.
Set multimeter to read ac voltage.
4.
Connect power cable (4) to power source.
5.
If meter indicated continuity in step 2, proceed to Adjustment procedure (WP 0028 00-5).
0028 00-1
