TM 9-4520-271-14
DESCRIPTION AND THEORY OF OPERATION
ARMY SPACE HEATER H-140
NSN 4520-01-477-0568
EQUIPMENT DESCRIPTION AND DATA
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES
The ASH is a portable unit that can be used as a heater or fresh air ventilator for shelters, vans, and other enclosed areas.
In the heating modes, the ASH can operate as either an air recirculator or fresh air heater. The ASH is rated at 140, 000
BTU per hour and can operate up to 8 hours unattended on a 14 gallon (53L) internal fuel tank. Operation can be
extended beyond 8 hours when used in the external fuel supply mode. The ASH operates as a heater in an ambient
temperature range of 60 F to +100 F (51 C to +38 C) and operates as a ventilator up to 100 F (38 C). The ASH
operates from a 120 Vac, 50/60 Hz, single phase power source, provides quiet operation (less than 60 dBa) for use in
areas where personnel work or sleep, has a positive pressurized enclosure, and incorporates an adjustable fresh air
damper assembly. The ASH includes a remote control box, retractable wheels, and skids for mobility on ice and snow.
Safety features include automatic shutdown in the event of an overtemperature condition or if the ASH detects carbon
monoxide gas in the shelter or return airflow. One person can move the ASH when the wheels are extended. The ASH is
also suitable for hardening for use in Nuclear, Biological, and Chemical (NBC) environments (WP 0007 00).
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