TM 10-4520-262-12&P GLOSSARY
PREPURGE - A stage of heater operation that precedes normal operation. During this stage of operation,
heater fans run to purge heater systems.
SETPOINT - A term used to indicate that the ambient temperature within the tent has reached or
exceeded the setting number at which the LOWER/HIGHER knob is positioned. This condition is
indicated by the illumination of the AT SETPOINT advisory light on the control panel assembly.